Re: Mac IIsi - SoG?
AFAIK there's nothing special about the video on the IIsi ... pretty sure that if the adapter and monitor will work with i.e. a standard Mac II 640x480x8 NuBus board (or equivalent) it should work with the IIsi. Best, Sean On Mon, Oct 26, 2015 at 11:30 PM, Jules Richardson < jules.richardso...@gmail.com> wrote: > > Can anyone confirm whether a Mac IIsi spits out sync-on-green (and only > sync-on-green) or not? I've found mixed info on the 'net so far. > > I've got a system here which makes encouraging startup noises, but isn't > outputting any video to a VGA screen (adapter cable OK with my other Macs). > > If it's SoG-only, well, there's my problem :-) If it does output h/vsync > like my other Macs then I need to look elsewhere (most likely nonsense > NVRAM settings, I expect). > > cheers > > Jules > > >
Re: Order now ! PDP8 front panels
how much? On Mon, Oct 26, 2015 at 4:02 PM, Jörg Hoppe wrote: > Rob, > > Here is a high quality PDP-11/70 foto: > ftp://jhoppe.ddns.net/blinkenbone/pdp1170.jpg > > I used it for the photographic panel Java simulation > > http://blinkenbone.com/projects/pdp-11-70-panel-on-blinkenbone/243-simulated-pdp-11-70-panel-on-simh > > The 20MPixel camera was aligned to the axis of the panel, > a 105 mm tele non-zoom lens was used for minimal geometric distortion. > Hope this helps. > > Joerg > > > > Am 26.10.2015 um 14:44 schrieb rod: > >> Hi Guys >> >> OK I'm open for orders for the choice of the following: >> >> PDP-8/e (Type A) >> PDP-8/e (Type B) >> PDP-8/f >> PDP-8/m >> >> Existing orders price as pre-paid >> New orders price will be advised based on batch sizes >> /f and /m are going to be a few dollars more as they need an extra >> screen for the logos. >> >> There are_twenty slots_ of which _five_ have already gone >> >> Ask for the file of designs if you don't have it. >> >> New panels in design stage for the 11/40 up to 11/70. >> Scans, Photos and "I want one" for the above to me please. >> >> Rod Smallwood >> >> >> >> >>
Re: Order now ! PDP8 front panels
H Adrian For the 11/70 ? Rod On 27/10/15 01:48, Adrian Stoness wrote: how much? On Mon, Oct 26, 2015 at 4:02 PM, Jörg Hoppe wrote: Rob, Here is a high quality PDP-11/70 foto: ftp://jhoppe.ddns.net/blinkenbone/pdp1170.jpg I used it for the photographic panel Java simulation http://blinkenbone.com/projects/pdp-11-70-panel-on-blinkenbone/243-simulated-pdp-11-70-panel-on-simh The 20MPixel camera was aligned to the axis of the panel, a 105 mm tele non-zoom lens was used for minimal geometric distortion. Hope this helps. Joerg Am 26.10.2015 um 14:44 schrieb rod: Hi Guys OK I'm open for orders for the choice of the following: PDP-8/e (Type A) PDP-8/e (Type B) PDP-8/f PDP-8/m Existing orders price as pre-paid New orders price will be advised based on batch sizes /f and /m are going to be a few dollars more as they need an extra screen for the logos. There are_twenty slots_ of which _five_ have already gone Ask for the file of designs if you don't have it. New panels in design stage for the 11/40 up to 11/70. Scans, Photos and "I want one" for the above to me please. Rod Smallwood
Re: Order now ! PDP8 front panels
Thank you most helpful. Regards Rod On 26/10/15 21:02, Jörg Hoppe wrote: Rob, Here is a high quality PDP-11/70 foto: ftp://jhoppe.ddns.net/blinkenbone/pdp1170.jpg I used it for the photographic panel Java simulation http://blinkenbone.com/projects/pdp-11-70-panel-on-blinkenbone/243-simulated-pdp-11-70-panel-on-simh The 20MPixel camera was aligned to the axis of the panel, a 105 mm tele non-zoom lens was used for minimal geometric distortion. Hope this helps. Joerg Am 26.10.2015 um 14:44 schrieb rod: Hi Guys OK I'm open for orders for the choice of the following: PDP-8/e (Type A) PDP-8/e (Type B) PDP-8/f PDP-8/m Existing orders price as pre-paid New orders price will be advised based on batch sizes /f and /m are going to be a few dollars more as they need an extra screen for the logos. There are_twenty slots_ of which _five_ have already gone Ask for the file of designs if you don't have it. New panels in design stage for the 11/40 up to 11/70. Scans, Photos and "I want one" for the above to me please. Rod Smallwood
Re: PDP 8 panels. Feedback
On 10/26/2015 08:54 PM, wulfman wrote: To effectively drill in plastics you need to run the drill press on the highest speed you can and use a freshly sharpened drill bit. If this is Perspex/Plexiglas, I've had great results with a good sharp Forstner bit in my drill press at medium (say 750 RPM) speed and a not-too aggressive feed.. No melting, just lots of crumbly shavings. I've done this with sizes down to about 1/4", but no smaller. When you're almost through the material, turn it over and complete the hole from the back side. Very clean edges, with no chips at all. --Chuck
Re: PDP 8 panels. Feedback
To effectively drill in plastics you need to run the drill press on the highest speed you can and use a freshly sharpened drill bit. It kinda melts its way through. On 10/26/2015 8:28 PM, Bob Rosenbloom wrote: > On 10/26/2015 8:05 PM, rod wrote: >> Hi Guys >> I need to get some comments on the following. >> >> 1. Would a matt finish be better than the current glossy one? >> 2. Should the round holes be pre-drilled? >> >> Regards >> Rod > > I would prefer the holes be drilled. It's not easy to drill the > plastic as I found out, with small chips around the edges. > And that was with a bit made for plastic. > > Bob > -- The contents of this e-mail and any attachments are intended solely for the use of the named addressee(s) and may contain confidential and/or privileged information. Any unauthorized use, copying, disclosure, or distribution of the contents of this e-mail is strictly prohibited by the sender and may be unlawful. If you are not the intended recipient, please notify the sender immediately and delete this e-mail.
Re: PDP 8 panels. Feedback
On 10/26/2015 8:05 PM, rod wrote: Hi Guys I need to get some comments on the following. 1. Would a matt finish be better than the current glossy one? 2. Should the round holes be pre-drilled? Regards Rod I would prefer the holes be drilled. It's not easy to drill the plastic as I found out, with small chips around the edges. And that was with a bit made for plastic. Bob -- Vintage computers and electronics www.dvq.com www.tekmuseum.com www.decmuseum.org
Mac IIsi - SoG?
Can anyone confirm whether a Mac IIsi spits out sync-on-green (and only sync-on-green) or not? I've found mixed info on the 'net so far. I've got a system here which makes encouraging startup noises, but isn't outputting any video to a VGA screen (adapter cable OK with my other Macs). If it's SoG-only, well, there's my problem :-) If it does output h/vsync like my other Macs then I need to look elsewhere (most likely nonsense NVRAM settings, I expect). cheers Jules
Re: PDP 8 panels. Feedback
On Mon, Oct 26, 2015 at 11:05 PM, rod wrote: > Hi Guys > I need to get some comments on the following. > > 1. Would a matt finish be better than the current glossy one? Hard to say, but generally, I think a closer match to the original is better. Is there a reason you want to consider a different finish? Cost? Fingerprints? > 2. Should the round holes be pre-drilled? I would think that the fewer holes that the users have to make in a brittle substance like acrylic, the better. It's easy to crack with a twist-drill, which is what most people have. There are "right ways" to drill it, but it's not wood. Lasers do a nice job of making smooth holes in acrylic. -ethan
PDP 8 panels. Feedback
Hi Guys I need to get some comments on the following. 1. Would a matt finish be better than the current glossy one? 2. Should the round holes be pre-drilled? Regards Rod
Re: filtering?
"imagine traveling beyond time, you entering the cctalk-zone!" OOooOOOoohhh ;-) On 26-10-15 22:06, Lawrence Wilkinson wrote: On 26/10/15 21:58, Eric Christopherson wrote: On Mon, Oct 26, 2015, simon wrote: Hi All, it seems that some of my messages do not get through to the list. Is there a filter on this list of some sort? Someone who knows more should chime in, but I believe messages to the list go through a human filter based on how on-topic they are, before being dispatched to either cctalk ONLY or cctalk+cctech. Yes, usually me. But I don't think that was Simon's problem. -- Met vriendelijke Groet, Simon Claessen drukknop.nl
Re: PROMs and EPROMs, specifically 2332/2532/2732
On 26/10/2015 17:09, "John Robertson" wrote: > Hi Adrian, > > Perhaps one final test for your 2332s is to do a Diode Test on the pins > relative to the ground pin (pin 12) and Vcc pin (24). These should sow > either open or something like 0.6 or higher voltage drop across the pins > - exchange the probes to check both directions. I've just realised what you meant. This means it's late and time I put the meter down for the night :) -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?
Re: PROMs and EPROMs, specifically 2332/2532/2732
On 26/10/2015 17:09, "John Robertson" wrote: > Hi Adrian, > > Perhaps one final test for your 2332s is to do a Diode Test on the pins > relative to the ground pin (pin 12) and Vcc pin (24). These should sow > either open or something like 0.6 or higher voltage drop across the pins > - exchange the probes to check both directions. I'll make up a small wiring harness that'll let me do that, it'll give me something to do while I'm waiting for my lady to ring :) > If your gates all read OK (check between Vcc and GND as well!), then it > might be that the brand of 2332 you have simply draws more current than > your programmer likes. What brand is the PROM? Perhaps it is in one of > our reference book libraries... They're all stock MOS 2332 PROMs used in every CBM PET. Mike's already linked to the archive and tonight I've successfully burnt the 8032-flavour PETTEST.BIN so my programmer is happy with Ti 2532JL EEPROMS that I liberated from work. Cheers, -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
> From: Ian Finder > so just on the safe side we'll cover some Engineering for Poets (or > Programmers) ROFL! Noel
RE: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
> My favorite low tech dummy load is the one my father came up with: a couple > of > resistors (carbon composite is best, carbon film or metal film will do), 1-2 > watt size, > in a jar filled with water. Works just fine for 100 watts or so, and is > useable not just > for power supplies but for HF transmitter testing. Why am I thinking of the Heathkit Cantenna? -tony
Re: filtering?
On 26/10/15 21:58, Eric Christopherson wrote: On Mon, Oct 26, 2015, simon wrote: Hi All, it seems that some of my messages do not get through to the list. Is there a filter on this list of some sort? Someone who knows more should chime in, but I believe messages to the list go through a human filter based on how on-topic they are, before being dispatched to either cctalk ONLY or cctalk+cctech. Yes, usually me. But I don't think that was Simon's problem. -- Lawrence Wilkinson lawrence at ljw.me.uk The IBM 360/30 page http://www.ljw.me.uk/ibm360
Re: Order now ! PDP8 front panels
Rob, Here is a high quality PDP-11/70 foto: ftp://jhoppe.ddns.net/blinkenbone/pdp1170.jpg I used it for the photographic panel Java simulation http://blinkenbone.com/projects/pdp-11-70-panel-on-blinkenbone/243-simulated-pdp-11-70-panel-on-simh The 20MPixel camera was aligned to the axis of the panel, a 105 mm tele non-zoom lens was used for minimal geometric distortion. Hope this helps. Joerg Am 26.10.2015 um 14:44 schrieb rod: Hi Guys OK I'm open for orders for the choice of the following: PDP-8/e (Type A) PDP-8/e (Type B) PDP-8/f PDP-8/m Existing orders price as pre-paid New orders price will be advised based on batch sizes /f and /m are going to be a few dollars more as they need an extra screen for the logos. There are_twenty slots_ of which _five_ have already gone Ask for the file of designs if you don't have it. New panels in design stage for the 11/40 up to 11/70. Scans, Photos and "I want one" for the above to me please. Rod Smallwood
Re: filtering?
On Mon, Oct 26, 2015, simon wrote: > Hi All, > > it seems that some of my messages do not get through to the list. Is there a > filter on this list of some sort? Someone who knows more should chime in, but I believe messages to the list go through a human filter based on how on-topic they are, before being dispatched to either cctalk ONLY or cctalk+cctech. -- Eric Christopherson
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
On 2015-10-26 2:32 PM, Ian Finder wrote: Not sure how much of a noob you are, although you repeatedly claim to be one so just on the safe side we'll cover some Engineering for Poets (or Programmers) to reassure you ;) -- V = I * R Power (watts) = I * V You know the voltage of the monitor. You know the resistance of your resistor. So, you also know the maximum power the resistor needs to be rated to dissipate. If the spec says the single air-cooled resistor you're buying is good to dissipate X watts into ambient temperature Y, I'd just go ahead and believe it. Make sure the numbers work out and you're fine, no heavy duty HVAC needed. :-P Yes, I got that far, and I got the same figure Mike did: 7.2W. Should I put that on one (say 10W) part, or copy Brian's technique and spread over multiple resistors? Now to see about building the board... Thanks for everyone's inputs. --Toby Cheers, - Ian On Mon, Oct 26, 2015 at 10:52 AM, Toby Thain wrote: On 2015-10-26 1:23 PM, Ian Finder wrote: This thread took a turn for the absurd. Oil? Water? What a practical bunch of people. /s They make resistors with adequate cooling... Almost as if they're rated for a certain number of watts of dissipation and you can buy them based on that. They are resistors after all. And if they overheat-- oh wait, they're heavy duty resistors, not ICs. Get a couple, put them in a metal project box, put it inline with the cable, and call it a day. Damn, I already ordered a pile of HVAC gear. j/k - yeah that was what I was basically planning, Ian ... just as a noob, I'm not totally confident with what a single air cooled part can dissipate. (The thread was kind of interesting anyway!) --Toby Sent from my iPhone On Oct 26, 2015, at 09:24, simon wrote: please skip this ridicule and grab yourself a couple of headlights from a car. On 26-10-15 17:16, Dale H. Cook wrote: My recommendation of oil is based upon my decades of experience with broadband dummy loads from 60 watts to 2.5 kilowatts. The dummy loads that I have worked with for medium wave and below and from 5 kilowatts down have all been convection air cooled. Broadband dummy loads that I have used for higher powers (up to 25 kilowatts) have been forced air cooled. I prefer to stick with what I have experience with. As for water, YMMV. Dale H. Cook, Radio Contract Engineer, Roanoke/Lynchburg, VA http://plymouthcolony.net/starcityeng/index.html -- Met vriendelijke Groet, Simon Claessen drukknop.nl
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
Hi Toby, I'll try to post some photos in a week or 2. Rob has asked me to make some internal load boards for him so I can show more details while I'm at it. The bulb is the best option in my opinion and seems to work just fine without additional cooling in the cube. -- Brian On Mon, Oct 26, 2015 at 6:43 AM, Toby Thain wrote: > On 2015-10-26 1:02 AM, Brian Archer wrote: > >> Even a 10W resistor will get really hot. I embed two 5W resistors into a >> pentium class CPU cooler for a good compromise on space/thermal concerns. >> You can see a pic on my site here: >> http://asterontech.com/Asterontech/next_adb_conversion.html >> >> > Hi Brian > > I did see your mod while looking around for info. > > I'd prefer not to mod the soundbox so my options seem to be your internal > backplane load board ( > http://www.nextcomputers.org/forums/viewtopic.php?t=3616&highlight=load+board > ) or maybe a small load board inline to the monitor cable? > > It looks like ambient cooling is sufficient for the version shown here? > > Thanks very much for the excellent info you've posted so far! > > --Toby > > Internal to the cube, I've found using a 5W appliance bulb to be the >> easiest. >> >> -- >> Brian Archer >> \ >> >
RE: Substituting DSHD for DSDD disks (or DS2D if you prefer)
> > Yes, the Sony OA-D32 drives. Single-sided 600 RPM. One *could* argue, > that, given the data rate, it's already "high density" (of a sort). I I would say it's normal double density (the spacing of the flux transitions on the disk is the same as on a PC 720K disk) but a high data rate due to the double spindle speed. There's a double-head version too. Not surprisingly I've worked on a lot of these drives, HP used them in many of their HPIB disk units. There was a later half-height version (not a high density drive, same format as the full height ones) which shares a lot of parts with the Apple 800K drive. -tony
RE: Oddball question: really small terminals
> -Original Message- > From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Jon Elson > Sent: 26 October 2015 19:09 > To: gene...@classiccmp.org; discuss...@classiccmp.org:On-Topic and Off- > Topic Posts > Subject: Re: Oddball question: really small terminals > > On 10/25/2015 08:32 PM, william degnan wrote: > > On Oct 25, 2015 8:54 PM, "Jon Elson" wrote: > >> On 10/25/2015 05:27 PM, Mike Ross wrote: > >>> > >>> A pull-out keyboard in the base? I have one too. Would be perfect if > >>> it worked, and I had half a dozen of them! > >>> > >>> > >> No, mine did NOT have a pull-out or fold-down kbd, it was all one > >> piece, > > like a micro-miniaturized ADM3 or similar terminal. Possibly it WAS > > the same as the picture on the Wikipedia article, I couldn't tell the > > scale from that pic. > >> Jon > > Something like the iXO handheld terminal? > > > > http://vintagecomputer.net/iXO/iXO_telecomputing-system.jpg > > > > > No, it WAS a Minitel. The Wikipedia picture gives nothing for scale, but > there > is a picture of one on a Google pictures collection that shows it on a desk > with > a regular keyboard and LCD screen, and you can see how small the thing > really was. > > Jon Televideo made small terminals, PT102 and "Personal Terminal". I found a pic here:- http://s11.photobucket.com/user/ballsandy/media/Computer%20related/100_2308.jpg.html but there are more about if you google Dave
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
> On Oct 26, 2015, at 2:49 PM, Chuck Guzis wrote: > > On 10/26/2015 10:52 AM, Toby Thain wrote: > > >> Damn, I already ordered a pile of HVAC gear. >> >> j/k - yeah that was what I was basically planning, Ian ... just as a >> noob, I'm not totally confident with what a single air cooled part >> can dissipate. > > > The talk about dummy loads brought back a memory of the Heath Cantenna--an RF > dummy load consisting of a Globar (noninductive) resistor in a gallon paint > can filled with mineral oil with an attachment to a SO-239 "UHF" connector on > top. IIRC, it was literally capable of dissipating a full "gallon". > > Kanthal Globar is still very much in business and does offer the resistors, > if anyone wants to build such a unit for old times' sake. For that matter, dummy loads that look just like that are sold currently by MFJ. paul
US South: AS/400 system
Spotted on CL, not near it, no relation to seller, etc: http://jackson.craigslist.org/sys/5246929532.html AS/400 is a narrow niche in the hobby but a complete running system can be hard to come by. Also, terminals are nice. j
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
Well, we indeed know the voltage (V or E) but not the current (I) used in your formula; since I is E/R then power is simply E^2/R, so 20 Ohms at 12V has to dissipate 144/20 = 7.2 W. m - Original Message - From: "Ian Finder" To: "General Discussion: On-Topic and Off-Topic Posts" Cc: Sent: Monday, October 26, 2015 2:32 PM Subject: Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again Not sure how much of a noob you are, although you repeatedly claim to be one so just on the safe side we'll cover some Engineering for Poets (or Programmers) to reassure you ;) -- V = I * R Power (watts) = I * V You know the voltage of the monitor. You know the resistance of your resistor. So, you also know the maximum power the resistor needs to be rated to dissipate. If the spec says the single air-cooled resistor you're buying is good to dissipate X watts into ambient temperature Y, I'd just go ahead and believe it. Make sure the numbers work out and you're fine, no heavy duty HVAC needed. :-P Cheers, - Ian On Mon, Oct 26, 2015 at 10:52 AM, Toby Thain wrote: On 2015-10-26 1:23 PM, Ian Finder wrote: This thread took a turn for the absurd. Oil? Water? What a practical bunch of people. /s They make resistors with adequate cooling... Almost as if they're rated for a certain number of watts of dissipation and you can buy them based on that. They are resistors after all. And if they overheat-- oh wait, they're heavy duty resistors, not ICs. Get a couple, put them in a metal project box, put it inline with the cable, and call it a day. Damn, I already ordered a pile of HVAC gear. j/k - yeah that was what I was basically planning, Ian ... just as a noob, I'm not totally confident with what a single air cooled part can dissipate. (The thread was kind of interesting anyway!) --Toby Sent from my iPhone On Oct 26, 2015, at 09:24, simon wrote: please skip this ridicule and grab yourself a couple of headlights from a car. On 26-10-15 17:16, Dale H. Cook wrote: My recommendation of oil is based upon my decades of experience with broadband dummy loads from 60 watts to 2.5 kilowatts. The dummy loads that I have worked with for medium wave and below and from 5 kilowatts down have all been convection air cooled. Broadband dummy loads that I have used for higher powers (up to 25 kilowatts) have been forced air cooled. I prefer to stick with what I have experience with. As for water, YMMV. Dale H. Cook, Radio Contract Engineer, Roanoke/Lynchburg, VA http://plymouthcolony.net/starcityeng/index.html -- Met vriendelijke Groet, Simon Claessen drukknop.nl -- Ian Finder (206) 395-MIPS ian.fin...@gmail.com
Re: Oddball question: really small terminals
On 10/25/2015 08:32 PM, william degnan wrote: On Oct 25, 2015 8:54 PM, "Jon Elson" wrote: On 10/25/2015 05:27 PM, Mike Ross wrote: A pull-out keyboard in the base? I have one too. Would be perfect if it worked, and I had half a dozen of them! No, mine did NOT have a pull-out or fold-down kbd, it was all one piece, like a micro-miniaturized ADM3 or similar terminal. Possibly it WAS the same as the picture on the Wikipedia article, I couldn't tell the scale from that pic. Jon Something like the iXO handheld terminal? http://vintagecomputer.net/iXO/iXO_telecomputing-system.jpg No, it WAS a Minitel. The Wikipedia picture gives nothing for scale, but there is a picture of one on a Google pictures collection that shows it on a desk with a regular keyboard and LCD screen, and you can see how small the thing really was. Jon
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
On Mon, 26 Oct 2015, Chuck Guzis wrote: The talk about dummy loads brought back a memory of the Heath Cantenna--an RF dummy load consisting of a Globar (noninductive) resistor in a gallon paint can filled with mineral oil with an attachment to a SO-239 "UHF" connector on top. IIRC, it was literally capable of dissipating a full "gallon". I have one of those sitting on the floor of my office. :) g. -- Proud owner of F-15C 80-0007 http://www.f15sim.com - The only one of its kind. http://www.diy-cockpits.org/coll - Go Collimated or Go Home. Some people collect things for a hobby. Geeks collect hobbies. ScarletDME - The red hot Data Management Environment A Multi-Value database for the masses, not the classes. http://scarlet.deltasoft.com - Get it _today_!
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
On 10/26/2015 10:52 AM, Toby Thain wrote: Damn, I already ordered a pile of HVAC gear. j/k - yeah that was what I was basically planning, Ian ... just as a noob, I'm not totally confident with what a single air cooled part can dissipate. The talk about dummy loads brought back a memory of the Heath Cantenna--an RF dummy load consisting of a Globar (noninductive) resistor in a gallon paint can filled with mineral oil with an attachment to a SO-239 "UHF" connector on top. IIRC, it was literally capable of dissipating a full "gallon". Kanthal Globar is still very much in business and does offer the resistors, if anyone wants to build such a unit for old times' sake. --Chuck
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
Not sure how much of a noob you are, although you repeatedly claim to be one so just on the safe side we'll cover some Engineering for Poets (or Programmers) to reassure you ;) -- V = I * R Power (watts) = I * V You know the voltage of the monitor. You know the resistance of your resistor. So, you also know the maximum power the resistor needs to be rated to dissipate. If the spec says the single air-cooled resistor you're buying is good to dissipate X watts into ambient temperature Y, I'd just go ahead and believe it. Make sure the numbers work out and you're fine, no heavy duty HVAC needed. :-P Cheers, - Ian On Mon, Oct 26, 2015 at 10:52 AM, Toby Thain wrote: > On 2015-10-26 1:23 PM, Ian Finder wrote: > >> This thread took a turn for the absurd. Oil? Water? What a practical >> bunch of people. /s >> >> They make resistors with adequate cooling... Almost as if they're >> rated for a certain number of watts of dissipation and you can buy >> them based on that. They are resistors after all. >> >> And if they overheat-- oh wait, they're heavy duty resistors, not >> ICs. Get a couple, put them in a metal project box, put it inline >> with the cable, and call it a day. >> > > Damn, I already ordered a pile of HVAC gear. > > j/k - yeah that was what I was basically planning, Ian ... just as a noob, > I'm not totally confident with what a single air cooled part can dissipate. > > (The thread was kind of interesting anyway!) > > --Toby > > > Sent from my iPhone >> >> On Oct 26, 2015, at 09:24, simon wrote: >>> >>> please skip this ridicule and grab yourself a couple of headlights from >>> a car. >>> >>> >>> >>> On 26-10-15 17:16, Dale H. Cook wrote: My recommendation of oil is based upon my decades of experience with broadband dummy loads from 60 watts to 2.5 kilowatts. The dummy loads that I have worked with for medium wave and below and from 5 kilowatts down have all been convection air cooled. Broadband dummy loads that I have used for higher powers (up to 25 kilowatts) have been forced air cooled. I prefer to stick with what I have experience with. As for water, YMMV. Dale H. Cook, Radio Contract Engineer, Roanoke/Lynchburg, VA http://plymouthcolony.net/starcityeng/index.html >>> >>> -- >>> Met vriendelijke Groet, >>> >>> Simon Claessen >>> drukknop.nl >>> >> >> > -- Ian Finder (206) 395-MIPS ian.fin...@gmail.com
Re: Substituting DSHD for DSDD disks (or DS2D if you prefer)
Chuck good to know we probably need some - I do not think we have any good clean ones new here... will check Ed# In a message dated 10/26/2015 9:50:44 A.M. US Mountain Standard Time, ccl...@sydex.com writes: On 10/26/2015 01:04 AM, couryho...@aol.com wrote: > and the first hp-150 drive set, the hp-9121, was single sided > double density SS/DD discs (270Kb). > > sure was glad when the 9122 came out! I supsect that the Sony SMC-70 may have been among the first systems to come out with the things. Fortunately, I still have several cartons (duplicator grade) of blank DSDD 3.5" mdedia. A few months ago, I gave away (FFS) about 1,000 of the things. I suspect that the the world's supply is far from exhausted. Lots of common word processors also used them (e.g. Brother). --Chuck
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
On 2015-10-26 1:23 PM, Ian Finder wrote: This thread took a turn for the absurd. Oil? Water? What a practical bunch of people. /s They make resistors with adequate cooling... Almost as if they're rated for a certain number of watts of dissipation and you can buy them based on that. They are resistors after all. And if they overheat-- oh wait, they're heavy duty resistors, not ICs. Get a couple, put them in a metal project box, put it inline with the cable, and call it a day. Damn, I already ordered a pile of HVAC gear. j/k - yeah that was what I was basically planning, Ian ... just as a noob, I'm not totally confident with what a single air cooled part can dissipate. (The thread was kind of interesting anyway!) --Toby Sent from my iPhone On Oct 26, 2015, at 09:24, simon wrote: please skip this ridicule and grab yourself a couple of headlights from a car. On 26-10-15 17:16, Dale H. Cook wrote: My recommendation of oil is based upon my decades of experience with broadband dummy loads from 60 watts to 2.5 kilowatts. The dummy loads that I have worked with for medium wave and below and from 5 kilowatts down have all been convection air cooled. Broadband dummy loads that I have used for higher powers (up to 25 kilowatts) have been forced air cooled. I prefer to stick with what I have experience with. As for water, YMMV. Dale H. Cook, Radio Contract Engineer, Roanoke/Lynchburg, VA http://plymouthcolony.net/starcityeng/index.html -- Met vriendelijke Groet, Simon Claessen drukknop.nl
Re: PROMs and EPROMs, specifically 2332/2532/2732
PET ROMs archive here: http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/index.html - Original Message - From: "John Robertson" To: "General Discussion: On-Topic and Off-Topic Posts" Sent: Monday, October 26, 2015 1:09 PM Subject: Re: PROMs and EPROMs, specifically 2332/2532/2732 On 10/25/2015 4:37 PM, Adrian Graham wrote: On 25/10/2015 17:19, "John Robertson" wrote: Hi John and others, Thanks for that. I removed the diodes and wired 2332 (21) to 2372 (24) leaving the A11 swap in place, the programmer complained about pin 18 missing. The adapter in front of me is now wired like this: 2332 (18) to 2372 (21) 2332 (20) 2x diodes to 2372 18 (band) and 20 (band) 2332 (20) 2k2 resistor to 2332 (24) 2332 (21) to 2372 (24) Now I get "reverse insertion" hinting I've wired something upside-down which isn't the case. I can read 27256 and 2764's no problem so I'm mounting things the correct way. Further digging into available eproms that the programmer can read reveals it CAN read 2532s, specifically the MCM2532 which the datasheet tells me has the same pinout as the 2332. I still get "reverse insertion error" so I'm guessing my PROMs are toast. Cheers, Reverse insertion may just mean you are drawing more current on the /OE and /CS than expected. How about this - go back to my original suggestion (no diodes) and this time add a small resistor to the 2732 pin 18 and Vcc to act as a load. Try larger resistors if the reader still complains - and try reading with NO 2332 in the reader (all FFs). Once you can trick the reader into reading air as highs then try your 2332 again with the working resistor values for the unused select. Oh, and what reader are you using? Did you check with the manufacturer (or archives somewhere - archive.org?) to see if they have a trick for reading 2532/2332s? It's an MQP Pinmaster48, a 90s-era programmer. As it happens tonight I got round to dumping some other EPROMs I had for someone else and one of them was an SGS2532 which read fine as an MCM2532 so I know the machine works with that age of chip. All my CBM ones give the same results so I'm assuming they're dead. Thinking about it there may be some 2532s at work so I can try burning a PET tester. I saw the madrigaldesign adapter on Friday but after re-re-remaking the one I was working on yesterday it was beginning to look a bit rough around the edges :) Cheers, Hi Adrian, Perhaps one final test for your 2332s is to do a Diode Test on the pins relative to the ground pin (pin 12) and Vcc pin (24). These should sow either open or something like 0.6 or higher voltage drop across the pins - exchange the probes to check both directions. If your gates all read OK (check between Vcc and GND as well!), then it might be that the brand of 2332 you have simply draws more current than your programmer likes. What brand is the PROM? Perhaps it is in one of our reference book libraries... If your 2332s are bad, then have you put out a call to see if anyone else has archived them already? John :-#)# -- John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames) www.flippers.com "Old pinballers never die, they just flip out"
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
This thread took a turn for the absurd. Oil? Water? What a practical bunch of people. /s They make resistors with adequate cooling... Almost as if they're rated for a certain number of watts of dissipation and you can buy them based on that. They are resistors after all. And if they overheat-- oh wait, they're heavy duty resistors, not ICs. Get a couple, put them in a metal project box, put it inline with the cable, and call it a day. Sent from my iPhone > On Oct 26, 2015, at 09:24, simon wrote: > > please skip this ridicule and grab yourself a couple of headlights from a car. > > > >> On 26-10-15 17:16, Dale H. Cook wrote: >> My recommendation of oil is based upon my decades of experience with >> broadband dummy loads from 60 watts to 2.5 kilowatts. The dummy loads that I >> have worked with for medium wave and below and from 5 kilowatts down have >> all been convection air cooled. Broadband dummy loads that I have used for >> higher powers (up to 25 kilowatts) have been forced air cooled. >> >> I prefer to stick with what I have experience with. As for water, YMMV. >> >> Dale H. Cook, Radio Contract Engineer, Roanoke/Lynchburg, VA >> http://plymouthcolony.net/starcityeng/index.html > > -- > Met vriendelijke Groet, > > Simon Claessen > drukknop.nl
Re: PROMs and EPROMs, specifically 2332/2532/2732
On 10/25/2015 4:37 PM, Adrian Graham wrote: On 25/10/2015 17:19, "John Robertson" wrote: Hi John and others, Thanks for that. I removed the diodes and wired 2332 (21) to 2372 (24) leaving the A11 swap in place, the programmer complained about pin 18 missing. The adapter in front of me is now wired like this: 2332 (18) to 2372 (21) 2332 (20) 2x diodes to 2372 18 (band) and 20 (band) 2332 (20) 2k2 resistor to 2332 (24) 2332 (21) to 2372 (24) Now I get "reverse insertion" hinting I've wired something upside-down which isn't the case. I can read 27256 and 2764's no problem so I'm mounting things the correct way. Further digging into available eproms that the programmer can read reveals it CAN read 2532s, specifically the MCM2532 which the datasheet tells me has the same pinout as the 2332. I still get "reverse insertion error" so I'm guessing my PROMs are toast. Cheers, Reverse insertion may just mean you are drawing more current on the /OE and /CS than expected. How about this - go back to my original suggestion (no diodes) and this time add a small resistor to the 2732 pin 18 and Vcc to act as a load. Try larger resistors if the reader still complains - and try reading with NO 2332 in the reader (all FFs). Once you can trick the reader into reading air as highs then try your 2332 again with the working resistor values for the unused select. Oh, and what reader are you using? Did you check with the manufacturer (or archives somewhere - archive.org?) to see if they have a trick for reading 2532/2332s? It's an MQP Pinmaster48, a 90s-era programmer. As it happens tonight I got round to dumping some other EPROMs I had for someone else and one of them was an SGS2532 which read fine as an MCM2532 so I know the machine works with that age of chip. All my CBM ones give the same results so I'm assuming they're dead. Thinking about it there may be some 2532s at work so I can try burning a PET tester. I saw the madrigaldesign adapter on Friday but after re-re-remaking the one I was working on yesterday it was beginning to look a bit rough around the edges :) Cheers, Hi Adrian, Perhaps one final test for your 2332s is to do a Diode Test on the pins relative to the ground pin (pin 12) and Vcc pin (24). These should sow either open or something like 0.6 or higher voltage drop across the pins - exchange the probes to check both directions. If your gates all read OK (check between Vcc and GND as well!), then it might be that the brand of 2332 you have simply draws more current than your programmer likes. What brand is the PROM? Perhaps it is in one of our reference book libraries... If your 2332s are bad, then have you put out a call to see if anyone else has archived them already? John :-#)# -- John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames) www.flippers.com "Old pinballers never die, they just flip out"
Re: Substituting DSHD for DSDD disks (or DS2D if you prefer)
On 10/26/2015 01:04 AM, couryho...@aol.com wrote: and the first hp-150 drive set, the hp-9121, was single sided double density SS/DD discs (270Kb). sure was glad when the 9122 came out! I supsect that the Sony SMC-70 may have been among the first systems to come out with the things. Fortunately, I still have several cartons (duplicator grade) of blank DSDD 3.5" mdedia. A few months ago, I gave away (FFS) about 1,000 of the things. I suspect that the the world's supply is far from exhausted. Lots of common word processors also used them (e.g. Brother). --Chuck
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
please skip this ridicule and grab yourself a couple of headlights from a car. On 26-10-15 17:16, Dale H. Cook wrote: My recommendation of oil is based upon my decades of experience with broadband dummy loads from 60 watts to 2.5 kilowatts. The dummy loads that I have worked with for medium wave and below and from 5 kilowatts down have all been convection air cooled. Broadband dummy loads that I have used for higher powers (up to 25 kilowatts) have been forced air cooled. I prefer to stick with what I have experience with. As for water, YMMV. Dale H. Cook, Radio Contract Engineer, Roanoke/Lynchburg, VA http://plymouthcolony.net/starcityeng/index.html -- Met vriendelijke Groet, Simon Claessen drukknop.nl
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
At 11:09 AM 10/26/2015, Paul Koning wrote: >... but tap water even in NYC? New York City tap water is of higher quality than the tap water available in many US cities. Dale H. Cook, Roanoke/Lynchburg, VA Osborne 1 / Kaypro 4-84 / Kaypro 1 / Amstrad PPC-640 http://plymouthcolony.net/starcity/radios/index.html
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
My recommendation of oil is based upon my decades of experience with broadband dummy loads from 60 watts to 2.5 kilowatts. The dummy loads that I have worked with for medium wave and below and from 5 kilowatts down have all been convection air cooled. Broadband dummy loads that I have used for higher powers (up to 25 kilowatts) have been forced air cooled. I prefer to stick with what I have experience with. As for water, YMMV. Dale H. Cook, Radio Contract Engineer, Roanoke/Lynchburg, VA http://plymouthcolony.net/starcityeng/index.html
Re: Order now ! PDP8 front panels
On Mon, Oct 26, 2015 at 9:44 AM, rod wrote: > New panels in design stage for the 11/40 up to 11/70. > Scans, Photos and "I want one" for the above to me please. I should have some scans of a real 11/70 plexi available to send soon. -ethan
Re: Substituting DSHD for DSDD disks (or DS2D if you prefer)
On Mon, 26 Oct 2015, Jules Richardson wrote: On 10/24/2015 09:14 PM, Fred Cisin wrote: Are we really running short of "720K" floppies? I've never had any luck finding used disks anywhere locally; people are a bit too concerned about data theft these days, and all of that seems to go straight to landfill. I suspect Athana still stocks them. g. -- Proud owner of F-15C 80-0007 http://www.f15sim.com - The only one of its kind. http://www.diy-cockpits.org/coll - Go Collimated or Go Home. Some people collect things for a hobby. Geeks collect hobbies. ScarletDME - The red hot Data Management Environment A Multi-Value database for the masses, not the classes. http://scarlet.deltasoft.com - Get it _today_!
Re: Quantum Link (Q-Link)
so this show is closer to reality than I thought?? not knowing quantum link none of the other services seemed to fit... Ed# In a message dated 10/26/2015 7:54:38 A.M. US Mountain Standard Time, et...@757.org writes: > Originally I thought it was basing it on Comnet or Compuserve but after > reading these comments, I now think Quantum Link makes more sense. They > are doing a good job portraying the various personalities, especially the > disfunctional ones. In the episode where there is a room full of people and it's up on a projection screen -- I looked up the Quantum Link main page online and it seemed to match. http://toastytech.com/guis/c64gquantumlink.gif That thing -- Ethan O'Toole
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
> > OK, so a couple years back, I wanted to have some chemistry fun with the kids. > So, I got out the jump cables, clamped them onto some aluminum foil, stuffed > the foil into test tubes, filled the tubes with water, inverted both of them > in the same basin and sprinkled in a little salt, cranked up the car, and > sure enough bubbles started evolving off the foil and collecting in the > test tubes. > Just as expected, one tube was filling with gas twice as fast as the other. > Just as expected, when we held that tube over a candle, it went WHEEP and > got hot (the flame was barely visible). > > Um the OP had a 12V supply, right? How *do* you keep from electrolyzing > your coolant in this apparatus. Firstly, don't add salt. Secondly, the low resistance dummy load is going to soak up almost all of the current, leaving very little to go through the much higher resistance water resulting in very little gas production. If the minute amount of gas produced is still a problem, you could electrically insulate the dummy load from the water. However, this may also help to thermally insulate from the water it which is not what you want. > > PS. this is a cool experiment but suitable cautions apply. The most subtle > is: not too much salt, lest you start evolving chlorine gas instead of > hydrogen. Flammable to explosive gasses, 12V sparks, etc. etc be careful > if you try to replicate this. Also, beware of the danger of shorting the jump cables together, either directly or via worn jewellery etc causing a large bang, melted terminals etc and possible damage to kids, self and car. Consider using something like a current limited bench power supply instead. Regards, Peter Coglan.
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
On 2015-10-26 16:09, Paul Koning wrote: On Oct 26, 2015, at 11:02 AM, Dale H. Cook wrote: At 10:45 AM 10/26/2015, Jerry Weiss wrote: Water in the dummy load? Water cooled - sure. Water immersed? Even though I see it posted on the web, i have may doubts it would be a stable method. I concur. Tap water may have contaminants (such as chlorine) that will cause electrical leakage. Sure, but so what? A dummy load is supposed to have electrical leakage. All that water contamination would do is reduce the effective resistance of your load by a hair. If you used seawater, it might make a difference that matters, but tap water even in NYC? No. I wonder if even sea water would make much difference...? Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: b...@softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
> On Oct 26, 2015, at 11:21 AM, Tapley, Mark wrote: > > On Oct 26, 2015, at 10:09 AM, Paul Koning wrote: > >>> I concur. Tap water may have contaminants (such as chlorine) that will >>> cause electrical leakage. >> >> Sure, but so what? A dummy load is supposed to have electrical leakage. >> All that water contamination would do is reduce the effective resistance of >> your load by a hair. > > OK, so a couple years back, I wanted to have some chemistry fun with > the kids. So, I got out the jump cables, clamped them onto some aluminum > foil, stuffed the foil into test tubes, filled the tubes with water, inverted > both of them in the same basin and sprinkled in a little salt, cranked up the > car, and sure enough … bubbles started evolving off the foil and collecting > in the test tubes. > Just as expected, one tube was filling with gas twice as fast as the > other. > Just as expected, when we held that tube over a candle, it went “WHEEP” > and got hot (the flame was barely visible). > > Um… the OP had a 12V supply, right? How *do* you keep from > electrolyzing your coolant in this apparatus? Some observations. One is that I've used this scheme for ages, and the only bubbles seen were steam (after having the dummy load dissipate 100 watts for a couple of minutes). Second: if you deliberately make the water conductive by adding salt, that's a different test setup. Try this with plain water. If your water is too cruddy, use deionized water; that's still a very cheap option. paul
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
On Oct 26, 2015, at 10:09 AM, Paul Koning wrote: >> I concur. Tap water may have contaminants (such as chlorine) that will cause >> electrical leakage. > > Sure, but so what? A dummy load is supposed to have electrical leakage. All > that water contamination would do is reduce the effective resistance of your > load by a hair. OK, so a couple years back, I wanted to have some chemistry fun with the kids. So, I got out the jump cables, clamped them onto some aluminum foil, stuffed the foil into test tubes, filled the tubes with water, inverted both of them in the same basin and sprinkled in a little salt, cranked up the car, and sure enough … bubbles started evolving off the foil and collecting in the test tubes. Just as expected, one tube was filling with gas twice as fast as the other. Just as expected, when we held that tube over a candle, it went “WHEEP” and got hot (the flame was barely visible). Um… the OP had a 12V supply, right? How *do* you keep from electrolyzing your coolant in this apparatus? - Mark PS. this is a cool experiment but suitable cautions apply. The most subtle is: not too much salt, lest you start evolving chlorine gas instead of hydrogen. Flammable to explosive gasses, 12V sparks, etc. etc… be careful if you try to replicate this.
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
> On Oct 26, 2015, at 11:02 AM, Dale H. Cook wrote: > > At 10:45 AM 10/26/2015, Jerry Weiss wrote: > >> Water in the dummy load? Water cooled - sure. Water immersed? Even >> though I see it posted on the web, i have may doubts it would be a stable >> method. > > I concur. Tap water may have contaminants (such as chlorine) that will cause > electrical leakage. Sure, but so what? A dummy load is supposed to have electrical leakage. All that water contamination would do is reduce the effective resistance of your load by a hair. If you used seawater, it might make a difference that matters, but tap water even in NYC? No. paul
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
> On Oct 26, 2015, at 10:56 AM, Paul Koning wrote: > > >> On Oct 26, 2015, at 10:45 AM, Jerry Weiss wrote: >> >> Water in the dummy load? Water cooled - sure. Water immersed? ... > ... > But for low voltage dummy loads, or for medium power ham transmitters, the > voltages involved are not that high. Plain tap water is slightly conductive, > but nowhere near as much as the resistors you're using. Come to think of it, water immersed setups have shown up in the literature. There was a nice article in QST a decade or so ago describing a 1296 MHz kilowatt amplifier, built with a 3CX100A5 converted to water immersion cooling. The setup included a clever trick to monitor the conductivity of the cooling water, so you could swap it out if it got too conductive. The water there was in direct contact with the anode, at around 2 kV or so. Worked fine apparently. I never built anything like that but the appraoch seemed sensible. paul
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
Distilled water will not conduct. Its a perfect insulator. It will work fine. On 10/26/2015 7:45 AM, Jerry Weiss wrote: > Water in the dummy load? Water cooled - sure. Water immersed? Even > though I see it posted on the web, i have may doubts it would be a stable > method. > > Oil is the usual medium here. Excluding of course the pre-1980 > transformer oils that were notorious for having contaminated PCB’s within or > anything with flammability at working temperatures. > > > Jerry Weiss > WB9MRI > > >> On Oct 26, 2015, at 9:27 AM, Paul Koning wrote: >> >> >>> On Oct 26, 2015, at 9:43 AM, Toby Thain wrote: >>> >>> On 2015-10-26 1:02 AM, Brian Archer wrote: Even a 10W resistor will get really hot. I embed two 5W resistors into a pentium class CPU cooler for a good compromise on space/thermal concerns. >> My favorite low tech dummy load is the one my father came up with: a couple >> of resistors (carbon composite is best, carbon film or metal film will do), >> 1-2 watt size, in a jar filled with water. Works just fine for 100 watts or >> so, and is useable not just for power supplies but for HF transmitter >> testing. >> >> paul >> >> > -- The contents of this e-mail and any attachments are intended solely for the use of the named addressee(s) and may contain confidential and/or privileged information. Any unauthorized use, copying, disclosure, or distribution of the contents of this e-mail is strictly prohibited by the sender and may be unlawful. If you are not the intended recipient, please notify the sender immediately and delete this e-mail.
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
At 10:45 AM 10/26/2015, Jerry Weiss wrote: >Water in the dummy load? Water cooled - sure. Water immersed? Even >though I see it posted on the web, i have may doubts it would be a stable >method. I concur. Tap water may have contaminants (such as chlorine) that will cause electrical leakage. >Oil is the usual medium here. Current non-PCB transformer oil is the preferred oil, but for relatively low power levels (say, 1 kilowatt dissipation or less) USP-grade mineral oil (available at your pharmacy) is a very viable substitute. Dale H. Cook, Roanoke/Lynchburg, VA Osborne 1 / Kaypro 4-84 / Kaypro 1 / Amstrad PPC-640 http://plymouthcolony.net/starcity/radios/index.html
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
> On Oct 26, 2015, at 10:45 AM, Jerry Weiss wrote: > > Water in the dummy load? Water cooled - sure. Water immersed? Even > though I see it posted on the web, i have may doubts it would be a stable > method. How stable do you need? > > Oil is the usual medium here. Transformer oil is a nice dielectric, so for high voltage transformers that's what you want. But for low voltage dummy loads, or for medium power ham transmitters, the voltages involved are not that high. Plain tap water is slightly conductive, but nowhere near as much as the resistors you're using. And water is a MUCH better coolant than oil. This is why machine tools typically use water as the coolant, or more precisely, water with a small amount of "soluble oil" mixed into it. It's true that resistors are not designed to sit in water indefinitely. But that means that, after a year or so, they may have been damaged. Hours or days of immersion doesn't bother them at all. If you want a good UHF dummy load, or one with 1% accuracy, this is probably not the best answer. If it needs to dissipate multiple kW, or last for a decade, ditto. But for a basic solution at near-zero cost, it works great. If you're not confident the load is still good 6 months from now, just spend 50 cents making another. Or lift the resistors out of the water-filled jar when done with the day's testing. paul, ni1d
Re: Quantum Link (Q-Link)
Originally I thought it was basing it on Comnet or Compuserve but after reading these comments, I now think Quantum Link makes more sense. They are doing a good job portraying the various personalities, especially the disfunctional ones. In the episode where there is a room full of people and it's up on a projection screen -- I looked up the Quantum Link main page online and it seemed to match. http://toastytech.com/guis/c64gquantumlink.gif That thing -- Ethan O'Toole
Re: looking for Siemens T100 telexes in the US
On 10/26/2015 12:56 AM, simon wrote: (As previous post did not get through, again a repost) Hi All, I was contacted via the greenkeys list for my spare parts of the two T100 telexes, but I think it should be possible to obtain them in the states. Is there someone willing to part of their broken or otherwise non/half functional T100 in the usa. they need the parts for a movie. I saw this a few times so it did get through. I guess that no one knows of a T100 anywhere. Bob -- Vintage computers and electronics www.dvq.com www.tekmuseum.com www.decmuseum.org
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
Water in the dummy load? Water cooled - sure. Water immersed? Even though I see it posted on the web, i have may doubts it would be a stable method. Oil is the usual medium here. Excluding of course the pre-1980 transformer oils that were notorious for having contaminated PCB’s within or anything with flammability at working temperatures. Jerry Weiss WB9MRI > On Oct 26, 2015, at 9:27 AM, Paul Koning wrote: > > >> On Oct 26, 2015, at 9:43 AM, Toby Thain wrote: >> >> On 2015-10-26 1:02 AM, Brian Archer wrote: >>> Even a 10W resistor will get really hot. I embed two 5W resistors into a >>> pentium class CPU cooler for a good compromise on space/thermal concerns. > > My favorite low tech dummy load is the one my father came up with: a couple > of resistors (carbon composite is best, carbon film or metal film will do), > 1-2 watt size, in a jar filled with water. Works just fine for 100 watts or > so, and is useable not just for power supplies but for HF transmitter testing. > > paul > >
Re: Substituting DSHD for DSDD disks (or DS2D if you prefer)
On 2015-10-26 11:38 AM, Jules Richardson wrote: On 10/24/2015 09:14 PM, Fred Cisin wrote: Are we really running short of "720K" floppies? I went around all the local places that I could think of a couple of years ago and bought up whatever stock of floppies that I could find (and picking sure were slim). Quite a few boxes of 3.5" HD, a few boxes of 5.25" DD, but zero 3.5" DD and 5.25" HD. 3.5" HD media just killed off the use of 3.5" DD and 5.25" HD, I suppose. I'm not sure what the reason for my finding a few boxes of 5.25" DD was, though - perhaps it was just produced in sufficient volume for there to still be a few survivors kicking around. I've never had any luck finding used disks anywhere locally; people are a bit too concerned about data theft these days, and all of that seems to go straight to landfill. cheers Jules Not long ago I bought a 100 from floppydisk.com for use with my vintage HP's they where reputed to be used but looked like new to me. They seem to work fine, I have not had any fail to format or fail in use. Paul.
Re: Substituting DSHD for DSDD disks (or DS2D if you prefer)
On 10/24/2015 09:14 PM, Fred Cisin wrote: Are we really running short of "720K" floppies? I went around all the local places that I could think of a couple of years ago and bought up whatever stock of floppies that I could find (and picking sure were slim). Quite a few boxes of 3.5" HD, a few boxes of 5.25" DD, but zero 3.5" DD and 5.25" HD. 3.5" HD media just killed off the use of 3.5" DD and 5.25" HD, I suppose. I'm not sure what the reason for my finding a few boxes of 5.25" DD was, though - perhaps it was just produced in sufficient volume for there to still be a few survivors kicking around. I've never had any luck finding used disks anywhere locally; people are a bit too concerned about data theft these days, and all of that seems to go straight to landfill. cheers Jules
Re: Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
> On Oct 26, 2015, at 9:43 AM, Toby Thain wrote: > > On 2015-10-26 1:02 AM, Brian Archer wrote: >> Even a 10W resistor will get really hot. I embed two 5W resistors into a >> pentium class CPU cooler for a good compromise on space/thermal concerns. My favorite low tech dummy load is the one my father came up with: a couple of resistors (carbon composite is best, carbon film or metal film will do), 1-2 watt size, in a jar filled with water. Works just fine for 100 watts or so, and is useable not just for power supplies but for HF transmitter testing. paul
Order now ! PDP8 front panels
Hi Guys OK I'm open for orders for the choice of the following: PDP-8/e (Type A) PDP-8/e (Type B) PDP-8/f PDP-8/m Existing orders price as pre-paid New orders price will be advised based on batch sizes /f and /m are going to be a few dollars more as they need an extra screen for the logos. There are_twenty slots_ of which _five_ have already gone Ask for the file of designs if you don't have it. New panels in design stage for the 11/40 up to 11/70. Scans, Photos and "I want one" for the above to me please. Rod Smallwood
Model 152 PSU dummy loads - Re: NeXT Cube - powers on briefly then off again
On 2015-10-26 1:02 AM, Brian Archer wrote: Even a 10W resistor will get really hot. I embed two 5W resistors into a pentium class CPU cooler for a good compromise on space/thermal concerns. You can see a pic on my site here: http://asterontech.com/Asterontech/next_adb_conversion.html Hi Brian I did see your mod while looking around for info. I'd prefer not to mod the soundbox so my options seem to be your internal backplane load board ( http://www.nextcomputers.org/forums/viewtopic.php?t=3616&highlight=load+board ) or maybe a small load board inline to the monitor cable? It looks like ambient cooling is sufficient for the version shown here? Thanks very much for the excellent info you've posted so far! --Toby Internal to the cube, I've found using a 5W appliance bulb to be the easiest. -- Brian Archer \
Anyone near Erie, PA? Pickup/Pack/Ship Help
Greetings, all, I have a contact in Erie, PA that has a piece of equipment that I need to get, but he is unwilling to ship it, and making a trip to his location to pick it up is pretty unlikely given time/expense. If there is a ClassicCmp'er that lives nearby Erie, and would be willing to pick up, pack and ship (at my expense) this item to me, I would be willing to pay for time/effort expended in doing so. The item is heavy, around 80 pounds. I could ship a very nice wooden crate to the packer who could use it to ship the item to me inside. All that would be necessary is to pick up the item, pack it securely in the crate, and take it to the closest UPS depot and drop it off to ship to me. If there is anyone out there who might be willing, please contact me by private Email: rickb /at/ bensene /dot/ com Thank you, Rick Bensene The Old Calculator Museum http://oldcalculatormuseum.com
Re: Siemens T100?
Hmm. very strange that only this specific mail and all probable answers did not get through. Rick Murphy kindly send a reply directly to me (thanks for that) It seems that some word in my subject did trigger an spam filter somewhere. There are no mails in my spambox on the webmail client to be found and no filters are active on any of this. I Apologize for these multiple posts. simon On 26-10-15 09:31, Rik Bos wrote: -Oorspronkelijk bericht- Van: cctalk [mailto:cctalk-boun...@classiccmp.org] Namens simon Verzonden: maandag 26 oktober 2015 9:18 Aan: On-Topic and Off-Topic Posts Onderwerp: Siemens T100? (As previous post did not get through, again a repost) Hi All, I was contacted via the greenkeys list for my spare parts of the two T100 telexes, but I think it should be possible to obtain them in the states. Is there someone willing to part of their broken or otherwise non/half functional T100 in the usa. they need the parts for a movie. -- Met vriendelijke Groet, Simon Claessen drukknop.nl Just counting ;) This is the 5th time you're sending a T100 inquiry and I'm receiving it... Maybe your spam box is ahead of you? -Rik -- Met vriendelijke Groet, Simon Claessen drukknop.nl
RE: Commodore and Atari
Bit far - I'm in Australia :-) Have a friend who wants to get into classic computing and wants to return to his roots with an Atari - I said I'd keep an eye out for him. ++ Kevin Parker ++ -Original Message- From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Cindy Croxton Sent: Sunday, 25 October 2015 12:22 PM To: 'General Discussion: On-Topic Posts' Subject: RE: Commodore and Atari Texas -Original Message- From: cctech [mailto:cctech-boun...@classiccmp.org] On Behalf Of Kevin Parker Sent: Saturday, October 24, 2015 8:19 PM To: 'General Discussion: On-Topic Posts' Subject: RE: Commodore and Atari Where are you located ++ Kevin Parker ++ -Original Message- From: cctech [mailto:cctech-boun...@classiccmp.org] On Behalf Of Cindy Croxton Sent: Saturday, 24 October 2015 11:48 AM To: 'General Discussion: On-Topic and Off-Topic Posts' Subject: Commodore and Atari Is anyone interested in a Vic 20, Atari 800XL, or an Amiga? The Amiga appears to be missing a couple of things. No AC adapters for any of them. Complete key caps, no severe yellowing, no way to test. The Amiga resembles this one: http://www.oldcomputers.net/pics/amiga500.jpg Cindy --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus
RE: Siemens T100?
> -Oorspronkelijk bericht- > Van: cctalk [mailto:cctalk-boun...@classiccmp.org] Namens simon > Verzonden: maandag 26 oktober 2015 9:18 > Aan: On-Topic and Off-Topic Posts > Onderwerp: Siemens T100? > > (As previous post did not get through, again a repost) > > > Hi All, > > I was contacted via the greenkeys list for my spare parts of the two > T100 telexes, but I think it should be possible to obtain them in the > states. Is there someone willing to part of their broken or otherwise > non/half functional T100 in the usa. > > they need the parts for a movie. > -- > Met vriendelijke Groet, > > Simon Claessen > drukknop.nl Just counting ;) This is the 5th time you're sending a T100 inquiry and I'm receiving it... Maybe your spam box is ahead of you? -Rik
Siemens T100?
(As previous post did not get through, again a repost) Hi All, I was contacted via the greenkeys list for my spare parts of the two T100 telexes, but I think it should be possible to obtain them in the states. Is there someone willing to part of their broken or otherwise non/half functional T100 in the usa. they need the parts for a movie. -- Met vriendelijke Groet, Simon Claessen drukknop.nl
Re: looking for Siemens T100 telexes in the US
> (As previous post did not get through, again a repost) Actually, it got through just fine, at least to me. I've sent an offlist copy of the whole post as it arrived in my mailbox; if you don't get it, something is disrupting your incoming mail stream /~\ The ASCII Mouse \ / Ribbon Campaign X Against HTMLmo...@rodents-montreal.org / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B
filtering?
Hi All, it seems that some of my messages do not get through to the list. Is there a filter on this list of some sort? -- Met vriendelijke Groet, Simon Claessen drukknop.nl
Re: Substituting DSHD for DSDD disks (or DS2D if you prefer)
and the first hp-150 drive set, the hp-9121, was single sided double density SS/DD discs (270Kb). sure was glad when the 9122 came out! Always looking for more HP-150 stuff for our display... any one have a monarch butterfly advertising poster? Ed# _www.smecc.org_ (http://www.smecc.org) In a message dated 10/26/2015 12:52:56 A.M. US Mountain Standard Tim, ccl...@sydex.com writes: On 10/25/2015 11:12 PM, tony duell wrote: > Not always! The original Sony full-height drives (the 600rm ones) > have a disk-inserted sensor positioned exactly where that hole is. So > if you insert an HD disk the drive doesn't detect it. It is rumoured > this was deliberate (positioning of the HD hole) so that you couldn't > use the wrong disks and have reliability problems. Yes, the Sony OA-D32 drives. Single-sided 600 RPM. One *could* argue, that, given the data rate, it's already "high density" (of a sort). I worked out a BIOS for a Z80 CP/M system called a Preis around 1982, when the drive was pretty new. It was a luggable and had a hard disk option as well. I don't know whatever became of them--but I still have the BIOS listing in my files. I don't think that anyone had any thoughts about putting such a drive in with a controller that would do 1Mbps. Sony never alluded to it in their documentation. The battle of the "pocket floppies", IIRC, hadn't yet been settled in 1982. We could just as well have wound up with the Shugart/Dysan 3.25" floppy--or worse, the Hitachi 3" disks as used in the Amstrad machines. I've still got a couple of 3.5" ED drives, along with blank media--there was a trend that didn't last long... --Chuck
Re: Couplers for Sun DB13W3<->VGA DE15 adapter
The socket is a metal piece with an inside thread on one end and an outside thread on the other end. You commonly see them on serial connectors usually on the equipment the cable attached too. The bottoming out I was refering too was it you use a standoff you may have too much exposed thread on the screws. They will meet inside the standoff before the connectors are properly seated. Joe > On Oct 25, 2015, at 5:28 PM, Eric Christopherson > wrote: > > On Sun, Oct 25, 2015 at 6:07 AM, Joseph Lang > wrote: > >> 4-40 is the correct size. I would remove the jack screws on one side and >> replace with sockets. If you use standoffs the screws May bottom out too >> soon. >> > > Could you explain that in more detail? I'm not aware of "sockets" except as > the tools that are used for turning hex nuts; is there a kind of socket > that actually gets installed on a bolt? > > And I'm not sure what you mean about bottoming out. You just mean there > wouldn't be enough length of thread to fit both male ends securely? > > >> >> Joe >>> On Oct 24, 2015, at 5:47 PM, Eric Christopherson < >> echristopher...@gmail.com> wrote: >>> >>> I have a Sun machine with a 13W3 framebuffer output, which is connected >>> via a Monoprice VGA adapter to my LCD monitor. It works great, but the >>> ends of the standoff bolts without nuts come together where the VGA >>> cable meets the adapter; that is to say, the VGA cable's nuts are on the >>> far side of the shell from its male end, and the adapter's nuts are on >>> the far side of the shell from its female end. >>> >>> I'm wondering what I can put between the two to keep the cable from >>> disconnecting from the adapter. Some searches seem to indicate I want >>> some 4x40 (or 4-40) female-female (coupling) nuts; does this seem >>> correct? >>> >>> -- >>> Eric Christopherson >> > > > > -- >Eric Christopherson
looking for Siemens T100 telexes in the US
(As previous post did not get through, again a repost) Hi All, I was contacted via the greenkeys list for my spare parts of the two T100 telexes, but I think it should be possible to obtain them in the states. Is there someone willing to part of their broken or otherwise non/half functional T100 in the usa. they need the parts for a movie. -- Met vriendelijke Groet, Simon Claessen drukknop.nl
Re: testing...
hmm. strange.. this seems to work. thanks for ignoring this. simon On 26-10-15 08:47, simon wrote: Please ignore. it seems my mail does not get through the last couple of times. -- Met vriendelijke Groet, Simon Claessen drukknop.nl
Re: Substituting DSHD for DSDD disks (or DS2D if you prefer)
On 10/25/2015 11:12 PM, tony duell wrote: Not always! The original Sony full-height drives (the 600rm ones) have a disk-inserted sensor positioned exactly where that hole is. So if you insert an HD disk the drive doesn't detect it. It is rumoured this was deliberate (positioning of the HD hole) so that you couldn't use the wrong disks and have reliability problems. Yes, the Sony OA-D32 drives. Single-sided 600 RPM. One *could* argue, that, given the data rate, it's already "high density" (of a sort). I worked out a BIOS for a Z80 CP/M system called a Preis around 1982, when the drive was pretty new. It was a luggable and had a hard disk option as well. I don't know whatever became of them--but I still have the BIOS listing in my files. I don't think that anyone had any thoughts about putting such a drive in with a controller that would do 1Mbps. Sony never alluded to it in their documentation. The battle of the "pocket floppies", IIRC, hadn't yet been settled in 1982. We could just as well have wound up with the Shugart/Dysan 3.25" floppy--or worse, the Hitachi 3" disks as used in the Amstrad machines. I've still got a couple of 3.5" ED drives, along with blank media--there was a trend that didn't last long... --Chuck
testing...
Please ignore. it seems my mail does not get through the last couple of times. -- Met vriendelijke Groet, Simon Claessen drukknop.nl
Re: NeXT Cube - powers on briefly then off again
Even a 10W resistor will get really hot. I embed two 5W resistors into a pentium class CPU cooler for a good compromise on space/thermal concerns. You can see a pic on my site here: http://asterontech.com/Asterontech/next_adb_conversion.html Internal to the cube, I've found using a 5W appliance bulb to be the easiest. -- Brian Archer On Sun, Oct 25, 2015 at 7:46 PM, Toby Thain wrote: > On 2015-10-25 8:56 PM, Toby Thain wrote: > >> On 2015-10-25 8:42 PM, Ian Finder wrote: >> >>> No- if it works with the standard display, the supply is fine. >>> >>> Now that that's clear, I recall some cube supplies would do this >>> without a load for a display- I used to test them by triggering the >>> power-on pin, and seem to remember this behavior occurring if I didn't >>> have a big-ass resistor attached across the pins that normally >>> supplied power to the CRT. >>> >>> Try getting a dummy load on there, the circuitry you have may not be >>> putting enough load on the lines that usually run the CRT to keep the >>> supply in a steady state. >>> >>> >> >> Even though I'm an electronics noob, that seems pretty logical. Can you >> spell out what kind of resistor I'd need? >> >> Is it the 20 Ohm 20W between pin 12 (-12V) and GND that is mentioned here: >> >> >> http://www.nextcomputers.org/forums/viewtopic.php?t=1374&sid=80e5f0626eeb6a10eed066e21b61808d >> >> >> Is 20W the right rating? >> >> Thanks! >> --Toby >> >> > I got a really helpful response from Rob Blessin, from whom I bought the > splitter cable, along the same lines. My supply must be the 152 type that > requires a load. > > Boiling down all the info so far, it seems that a 20 Ohm resistor across > -12V and GND (maybe 12V and GND would work equally well?) would dissipate > 7.2W, which seems enough to keep the supply running (that other link talked > about a 5W load, so this seems a good margin). > > Now, 7.2W is more than one resistor in say a DB-19 shell could safely > dissipate, so I'm maybe looking at some kind of ambiently cooled board. Rob > provided these links: > > > Here: http://www.nextcomputers.org/forums/viewtopic.php?t=3736 and > version 1.0 megaload here: > http://www.nextcomputers.org/forums/viewtopic.php?t=3616&highlight=load+board > > > So I'm wondering what kind of thermal design is both easy and safe. A > single 10W resistor exposed to the air? Or should I spread it over a few > resistors on a little board that might have a DB-19 male at the Cube end. > > Just noob brainstorming here. > > --Toby > > >
