Re: PDP11 I/O page memory map

> On Mar 2, 2018, at 8:37 AM, Noel Chiappa via cctalk > wrote: > >> From: Jerry Weiss > >> Typically execution of the RESET instruction in a user program is >> treated as a NOP > > Yeah, that's not documented in most PDP-11 CPU manuals, either. It's one of > the things that makes the PDP-11

Re: Some fun: who can identify this ?

Chad catcher from a PC05 paper tape punch? paul > On Mar 4, 2018, at 12:40 PM, Pete Lancashire via cctalk > wrote: > > https://photos.app.goo.gl/ww7KPnPVexGJiqyE3

Re: Did anyone on the list get these tapes?

> On Mar 16, 2018, at 11:51 AM, Al Kossow via cctalk > wrote: > > https://www.ebay.com/itm/1372243559202 > > basic.p11 > syslod.p11 > rdt.p11 > > all from mid 1971 > original RSTS? > > hope the person who got these knows what they bought "P11" was the extension used for PDP-11 assembly fil

Re: PDP-11 floating CSRs: 760010, or 760100?

> On Mar 17, 2018, at 10:10 PM, Fritz Mueller via cctalk > wrote: > > >> On Mar 17, 2018, at 6:57 PM, Fritz Mueller wrote: >> >> I have a question about floating CSR allocation on PDP-11s. Both the 1976 >> and 1981 versions of the PDP-11 peripherals handbook indicate the floating >> CSRs

Re: ounting screw threads for VR201?

> On Mar 19, 2018, at 2:18 PM, Alan Frisbie via cctalk > wrote: > > ... > Now, could someone please tell me the pinouts for the 15-pin connector? > I would like to use it to view RS-170 video, if possible. It's spelled out in fair detail in the Pro 300 Technical Manual, on Bitsavers. Look a

Re: ounting screw threads for VR201?

> On Mar 19, 2018, at 3:05 PM, Warner Losh via cctalk > wrote: > > ... > For the Rainbow (and I think the Pro to), there's a DC coupling that's not > normal that needs to be removed with a series capacitor: > > From 3.5.3 Keyboard/Monitor Connector (J3) Signals of The Rainbow 100 > Technical

Re: UCSD p-system manuals and disks?

> On Mar 20, 2018, at 7:50 AM, Mattis Lind via cctalk > wrote: > > So I have imaged the three disks I found using ImageDisk: > http://storage.datormuseum.se/u/96935524/Datormusuem/TEXAS.zip > > Then I scanned one of the manuals. UCSD Pascal : > http://storage.datormuseum.se/u/96935524/Datormu

Re: Shipping a Flexowriter

> On Mar 23, 2018, at 1:43 PM, Kyle Owen via cctalk > wrote: > > Thank you for the compliments! I'm looking forward to getting it going. > > Any idea what the model (FIO) indicates? I don't know that specific designation and I can't find my reference. But I do know that Friden would make c

Re: Did anyone on the list get these tapes?

> On Mar 24, 2018, at 11:34 PM, Josh Dersch via cctalk > wrote: > > ... > There's also what looks like some very early RSTS source in there. The BASIC-PLUS interpreter part, yes. RTS.P11, there are two versions. I'll look at them more closely. I have a 1971 listing of "BTSS" which is clea

Re: RAID? Was: PATA hard disks, anyone?

> On Mar 27, 2018, at 8:51 PM, Fred Cisin via cctalk > wrote: > > Well outside my realm of expertise (as if I had a realm!), . . . > > How many drives would you need, to be able to set up a RAID, or hot swappable > RAUD (Redundant Array of Unreliable Drives), that could give decent > reliab

Re: Looking for opinions...

> On Mar 28, 2018, at 11:20 AM, Ethan via cctalk wrote: > >> I found a stack of DEC microfiche a few nights ago. It's probably about 12 >> inches tall, and contains PM Procedures, IPBs, Manuals, Tech Info, and >> several type of Logistics, BOMs, vendors, etc which I will deal with >> later. M

Re: RAID? Was: PATA hard disks, anyone?

> On Mar 28, 2018, at 2:32 PM, Fred Cisin via cctalk > wrote: > >>> How many drives would you need, to be able to set up a RAID, or hot >>> swappable RAUD (Redundant Array of Unreliable Drives), that could give >>> decent reliability with such drives? >>> How many to be able to not have data

Re: Looking for opinions...

> On Mar 28, 2018, at 4:40 PM, Fred Cisin via cctalk > wrote: > > On Wed, 28 Mar 2018, Mazzini Alessandro via cctalk wrote: >> Uh.. now the big question.. how big/heavy is a microfiche viewer ? > > They vary. I have one that fits in a pocket! > Usually, they are a tabletop box a few feet sq

Re: RAID? Was: PATA hard disks, anyone?

It's not quite that bad. The answer is that the MTBF of four drives is probably not simply the MTBF of one drive divided by four. If you have a good description of the probability of failure as a function of drive age (i.e., a picture of its particular "bathtub curve") you can then work out th

Re: OT: Digitising collections of microfiche - Re: Looking for opinions...

> On Mar 28, 2018, at 11:39 PM, Fred Cisin via cctalk > wrote: > > On Wed, 28 Mar 2018, Bob Rosenbloom via cctalk wrote: >> This thread reminded me of a DYI scanner I had read about. Found it with >> google: >> http://retrocmp.com/projects/scanning-micro-fiches/235-the-homebuild-automatic-mic

Re: Speed now & then

> On Mar 29, 2018, at 12:20 PM, Murray McCullough via cctalk > wrote: > > I’m not trying to date myself but have things truly sped up? In 1970’s > Toronto I had a classic computer, sorry can’t recall what it was, connected > to a 300 baud modem; by early 80’s had ‘zoomed’ to 9600 baud. Oh, my!

Re: Speed now & then (Space and time?)

> On Mar 29, 2018, at 7:05 PM, Chuck Guzis via cctalk > wrote: > > On 03/29/2018 02:24 PM, Fred Cisin via cctalk wrote: HOWEVER, a variant of "Boyle's Law" warns that software and content will expand to fit all available space and speed. >> >> On Thu, 29 Mar 2018, allison via cctalk

Re: Looking for opinions...

>>> ... >> " Three considerations suggest that he [Bush] was unaware of the detail >> of Goldberg's work when he [Bush] built his prototype in 1938-40: [. . >> .] " >> and makes no conclusion of conscious influence (on Bush by Goldberg). >> So when you say Bush "stole", and "claimed it

Re: Speed now & then (Space and time?)

> On Mar 31, 2018, at 6:26 PM, ben via cctalk wrote: > >> ... > > But that is the old fly in the ointment, other software may not be avilable. > I do run windows and real text screen UNIX is not aviable anymore. Sure it is. You can perfectly well install Linux without the GUI components,

Re: WeirdStuff going out of business

I get a message saying I don't have permission to see that picture. paul > On Apr 5, 2018, at 8:21 PM, Al Kossow via cctalk > wrote: > > Last Day is this Sunday > > http://www.vcfed.org/forum/showthread.php?63045-WeirdStuff-is-going-out-of-buisiness-( > > since I can't attach a pictu

Re: Speed now & then

> On Apr 11, 2018, at 11:05 AM, Liam Proven wrote: > > On 29 March 2018 at 19:53, Paul Koning via cctalk > wrote: >> >> It would be fun to do a "generalized Moore's Law" chart, showing not just >> transistor count growth (Moore's subje

Re: Speed now & then

> On Apr 11, 2018, at 2:31 PM, Jecel Assumpcao Jr. via cctalk > wrote: > > Chuck Guzis wrote on Wed, 11 Apr 2018 11:09:23 -0700 >> I thought that Moore's "law" dealt only with the number of transistors >> on a die. Did Gordon also say something about performance? > > That is correct. The ob

Re: Speed now & then (Space and time?)

> On Apr 11, 2018, at 5:48 PM, ben via cctalk wrote: > > ... >>> and real text screen UNIX is not aviable anymore. >> Sure it is. > > I have a nice 18 bit cpu here, with only a few hardware bugs. > Hmm would it work better if I change that around ideas. > > Care to point to a nice 18 bit vers

Re: RL Drive Terminators

The standard answer is "they are worth what a buyer will pay for them". An asking price isn't a value -- it may just be wishful thinking, or delusion. It does seem like something that could be built for a lot less money. paul > On Apr 20, 2018, at 9:24 AM, Bill Gunshannon via cctalk

Re: RL Drive Terminators

> On Apr 20, 2018, at 10:31 AM, Aaron Jackson via cctalk > wrote: > >> > > It's a bit disappointing to see them priced so highly. I don't think > I've seen one even listed in the UK. So if you are trying to sell them I > don't see why $100 or so wouldn't sell, at least eventually. I believe

Re: sugar packjets anyone ever come across em?

> On Apr 20, 2018, at 3:33 PM, Adrian Stoness via cctalk > wrote: > > anyone ever come across sugar packets? this came in a lot of manuals and > documents that arived the other day kinda neat > https://imagizer.imageshack.com/v2/800x512q90/922/T4MCLS.jpg I haven't seen that particular one. S

Re: sugar packjets anyone ever come across em?

> On Apr 20, 2018, at 4:53 PM, Grant Taylor via cctalk > wrote: > > On 04/20/2018 02:03 PM, Paul Koning via cctalk wrote: >> Sugar packets are common in Holland, and often come printed with company >> logos for use as promotional items (or for use in the company c

Re: GDB front-end for SimH

On Apr 24, 2018, at 5:38 PM, Kyle Owen via cctalk wrote: > > Has anyone made a GDB front-end for SimH? Just curious. Seems like it could > be an interesting way to tie an IDE to SimH, if one were inclined. > > Thanks, > > Kyle I haven't seen one. But it would certainly make sense to tie in a

Re: GDB front-end for SimH

> On Apr 24, 2018, at 8:14 PM, Maciej W. Rozycki wrote: > > On Tue, 24 Apr 2018, Paul Koning via cctalk wrote: > >> One drawback is that there aren't all that many SIMH architectures that >> have GDB support. VAX does, and Alpha; that's about it. I don

Re: Bitsavers

Bitsavers was reorganized by subject area. The categories are software, computing, communications, components, and test equipment. The "pdf" subtree is for "computing". You can find GI at http://www.bitsavers.org/components/gi/ . paul > On A

Restoring rubber keyboard on a logic analyzer

Gentlepeople, I have a Philips logic analyzer (PM3585) which is about 20 years old at this point. It seems to be basically functional except for the keyboard, which unfortunately is a critical part. This is one of those molded rubber type, with a circuit board behind the rubber that has conta

Re: Restoring rubber keyboard on a logic analyzer

> On Apr 26, 2018, at 12:32 PM, Electronics Plus via cctalk > wrote: > > Easier solution is to apply some conductive light lube. Radio Shack used to > carry it, and I repaired a LOT of remote controls with it! > > Cindy I made a successful repair. Here are the steps I used: As I mentioned,

Re: Restoring rubber keyboard on a logic analyzer

> On Apr 29, 2018, at 11:44 PM, Tony Duell via cctalk > wrote: > > ... > It's not cheap (and IIRC you have to use the whole lot in one go), but > Chemtronics make a kit to repair such keypads. Possibly worth it for > a useful instrument though. > > In the UK you can get it here : > > https:/

Re: old vintage stuff for pretty cheap

Clearly a website that steals other people's work is a problem. If they do stuff like that, they may have larger criminal intent. For example, the links may be malware vectors. Weird top level domains like "top" are a sign to be suspicious. paul > On May 3, 2018, at 4:38 PM, Eric Ch

Re: Old core memory system.

> On May 5, 2018, at 2:32 PM, Chuck Guzis via cctalk > wrote: > > On 05/05/2018 10:23 AM, Pete Lancashire via cctalk wrote: >> Core temp was a big issue even in commercial environments. You didn't see >> it temp but you would see core [driver] current. > > The early IBM 7000 series (7070, 708

how fast were drum memories?

Drums were used as main memory in a number of early computers, and as secondary memory for a while longer. I wonder how fast real ones (actually constructed) managed to be. What prompted this question is reading an interesting document: https://ir.cwi.nl/pub/9603 (in Dutch), "Principles of ele

Re: how fast were drum memories?

> On May 10, 2018, at 10:57 AM, Chuck Guzis via cctalk > wrote: > > On 05/10/2018 07:29 AM, Paul Koning via cctalk wrote: > >> I'm wondering what the reality of fast drum memories looked like, and >> whether anyone came even close to these numbers. Also, am

Re: how fast were drum memories?

> On May 10, 2018, at 10:37 AM, Grif wrote: > > > I wonder how the late generation paging disks (fixed head per track) like DG > used in the 80's compared? One that comes to mind is the DEC RS04. It spins at roughly 3600 rpm (a hair less, so obviously a 2 pole induction motor running off 3

Re: how fast were drum memories?

> On May 10, 2018, at 11:33 AM, Peter Corlett via cctalk > wrote: > > On Thu, May 10, 2018 at 10:29:06AM -0400, Paul Koning via cctalk wrote: >> [...] So far so good. He goes on to suggest that such a drum might spin at >> 1000 revolutions per second, i.e., 60,000 r

Re: Unknown CDC unit , looks like a drum memory ?

> On May 16, 2018, at 8:28 PM, geneb via cctalk wrote: > > On Wed, 16 May 2018, Ed Sharpe via cctalk wrote: > >> OK I see there is a mix of photos in this directory! >> some tape reader some drum 2 separate topics. >> > Ed, I don't know if you (or anyone else) can see this, but

Re: Original CAD code in the wild?

> On May 21, 2018, at 7:52 AM, Noel Chiappa via cctalk > wrote: > >> From: Randy Dawson > >> For a while I have collected bits of legacy CAD >> ... >> My question is, did any of the source code for these systems >> .. ever make it out > > Well, not quite what you're asking about, I think (i

Re: DEC RSX-11D and its COBOL compiler?

> On May 29, 2018, at 3:30 AM, Nigel Williams via cctalk > wrote: > > On Tue, May 29, 2018 at 1:27 AM, Al Kossow via cctalk > wrote: >> I have 11D on bitsavers. > > this is actually RSX-11D? http://bitsavers.org/bits/DEC/pdp11/magtapes/ias/ IAS is basically RSX-11/D under the covers, with

Re: DEC RSX-11D and its COBOL compiler?

> On May 29, 2018, at 9:38 AM, Guy N. via cctalk wrote: > > On Tue, 2018-05-29 at 17:30 +1000, Nigel Williams via cctalk wrote: >> On Tue, May 29, 2018 at 1:27 AM, Al Kossow via cctalk >> wrote: >>> I have 11D on bitsavers. >> >> this is actually RSX-11D? http://bitsavers.org/bits/DEC/pdp11/

Re: DEC RSX-11D and its COBOL compiler?

> On May 29, 2018, at 10:10 AM, Bill Degnan wrote: > > Is AIS the same as AIDCS? > > http://vintagecomputer.net/digital/IDACS_11-07/ No. IAS (not AIS) is an RSX-11/D variant that intended to add timesharing capabities to RSX-11/D. RSX-11/D was pretty much limited to fixed purpose real-time

Re: DEC RSX-11D and its COBOL compiler?

> On May 29, 2018, at 10:30 AM, John Forecast via cctalk > wrote: > > >> On May 29, 2018, at 3:30 AM, Nigel Williams via cctalk >> wrote: >> >> On Tue, May 29, 2018 at 1:27 AM, Al Kossow via cctalk >> wrote: >>> I have 11D on bitsavers. >> >> this is actually RSX-11D? http://bitsavers.o

Re: Modifying microcode

> On May 30, 2018, at 11:11 AM, Camiel Vanderhoeven via cctalk > wrote: > > Depending on your definition of small, the MicroVAX 1, and the VAX 8000 > series (not that small). In both cases though, the ROM chips are a custom DEC > design. Didn't the 780 get its microcode loaded by the conso

Re: Modifying microcode

> On Jun 2, 2018, at 2:08 PM, Robert Armstrong via cctalk > wrote: > >> Tony Duell wrote: >> Incidentally, did DEC ever release any details (flowcharts, source listings, >> etc) of the 11/730 microcode? And what about the control PROMs for the >> memory system. The technical manual implies t

Re: Modifying microcode

> On Jun 4, 2018, at 1:17 PM, Robert Armstrong via cctalk > wrote: > > ... FWIW, I have a 725 complete and working. Well, except for the RC25, > which never worked even when they were new. Hm. I remember some RC25s on RSTS, and they seemed to be ok. The fact that they had two drives on

Re: CDC 6600 display character generation

> On Jun 6, 2018, at 9:48 AM, Noel Chiappa via cctalk > wrote: > > Hi, I'm hoping someone here knows the low-level nitty-gritty on how the > characters on the CDC 6600 console CRTs were generated. > > Thornton, "Design of a Computer", says "Control of the beam .. is provided by > electrostat

Re: CDC 6600 display character generation

> On Jun 6, 2018, at 12:31 PM, Noel Chiappa via cctalk > wrote: > >> From: Toby Thain > >> It's suggested there (without any proof though) that the CDC used a >> Fourier process >> ... >> I'd be very interested to know what you find out about the circuitry. > > Someone very kindly pointed m

Re: CDC 6600 display character generation

> On Jun 6, 2018, at 3:19 PM, Toby Thain wrote: > > On 2018-06-06 2:08 PM, Paul Koning via cctalk wrote: >> >> ... >> The block diagram manual shows the waveforms generated by the controller. >> As you can see, they are pretty angular and straight line

Re: CDC 6600 display character generation

> On Jun 6, 2018, at 3:40 PM, Chuck Guzis via cctalk > wrote: > > One of the more interesting things about the DD60 display was the use of > 2C43 "Lighthouse" UHF triode tubes to drive the CRT electrostatic > deflection. UHF, yes, but not those. The final state uses 3CX100A5 UHF transmitter

Re: CDC 6600 display character generation

> On Jun 6, 2018, at 5:17 PM, Jim Manley via cctalk > wrote: > > ... > I'm one of the early senior docents at the Computer History Museum in > SillyCon Valley and yammered on endlessly about the 6600 and its neighbor, > the 7600, but I never thought about character generation on the displays

Re: CDC 6600 display character generation

> On Jun 6, 2018, at 6:30 PM, Jim Manley via cctalk > wrote: > > ... > Seymour Cray was a genius because he observed that the fastest possible > circuit is a wire, and that if you use the same length of wire for each bit > in a word in cables between stages in a computer that you want to go a

Re: CDC 6600 display character generation

> On Jun 6, 2018, at 8:01 PM, Rick Bensene via cctalk > wrote: > > Speaking of CDC 6x00/Cyber 70-series consoles... > > I had a bit of a scary but memorable experience of sitting at the console of > a Cyber 73, many years ago. > > ... > Anyway, I was sitting at the console one morning, an

Re: CDC 6600 display character generation

> On Jun 7, 2018, at 2:50 AM, Rick Bensene via cctalk > wrote: > > ... > > Believe me, the console did spit out a lot of sparks and little blobs of > molten metal, along with quite a bit of smoke. I still have a small > scar on my left leg where one of the little blobs of metal burned me >

Re: CDC 6600 display character generation

> On Jun 7, 2018, at 3:21 AM, Lars Brinkhoff via cctalk > wrote: > > Paul Koning wrote: >> I have converted the "chassis tabs 12" wire lists to a VHDL model, >> which you can find on my Subversion server. Run on GHDL, it >> demonstrates the behavior of the circuit and reproduces the document

Re: Did anyone on the list get these tapes?

> > On Sun, Mar 25, 2018 at 1:57 AM, Al Kossow via cctalk > wrote: >> http://bitsavers.org/bits/DEC/pdp11/dectape/LCM_Early_PDP-11 I looked over these, more precisely the ones that related to the PDP11. Here are some notes. The most significant item from my point of view is that it contain

Re: DECServer 200/DL board?

I wonder if that's a DECserver-100 board. I remember seeing a box (I thought it was a prototype but I may be confused) with a fairly small PCB inside a much larger rackmount-sized enclosure, with 8 separate wire bundles going from connectors on the board to the MMJ jacks on the front panel. Th

Re: IBM junk

> On Jun 22, 2018, at 6:34 PM, Donald via cctalk wrote: > > Collected stuff for over 10 years. Moving from 2300 sq. ft. to 1400. It > had to go. Praise the computer gods I found someone that wanted it all. > > 115 boxes of manuals and documents. > 26 boxes of coffee mugs > 73 703 boxes of s

Re: 6800 fig-FORTH?

> On Jun 26, 2018, at 9:44 AM, Bill Gunshannon via cctalk > wrote: > > > > On 06/26/2018 09:37 AM, dwight wrote: > > Things were posted a little out of order. The problem was not in the original > listing. The pdf of the original was correct. The ascii text one, at > sourceforge, had a s

Re: Thicknet/10base5 Test Segment: The Cable is In!

> On Jun 26, 2018, at 1:04 PM, Grant Taylor via cctalk > wrote: > > On 06/26/2018 10:31 AM, Mark J. Blair via cctalk wrote: >> What does non-intrusive mean in this context? I thought that thick ethernet >> taps always required drilling a hole in the cable. > > There are taps that screw onto

Re: Thicknet/10base5 Test Segment: The Cable is In!

> On Jun 26, 2018, at 1:19 PM, Chuck Guzis via cctalk > wrote: > > On 06/26/2018 10:04 AM, Grant Taylor via cctalk wrote: > >> My assumption was that "tap" comes from the second form. I always >> thought there was a different name for the first form. But I believe >> they were less common,

Re: Thicknet/10base5 Test Segment: The Cable is In!

> On Jun 26, 2018, at 3:07 PM, systems_glitch via cctalk > wrote: > > I've confirmed that I now have N connector intrusive taps! These have a N > female connector on each end, like the leftmost transceiver in this picture: > > https://oelzant.priv.at/~aoe/images/galleries/hardware/802_3_tran

Re: Thicknet/10base5 Test Segment: The Cable is In!

> On Jun 26, 2018, at 3:23 PM, Ethan Dicks via cctalk > wrote: > > On Tue, Jun 26, 2018 at 3:07 PM, systems_glitch via cctalk > wrote: >> ... > >> I seem to recall the CCNA instructor telling us that you weren't really >> supposed to screw a 50 ohm terminator onto an intrusive tap; I don't

Re: Thicknet/10base5 Test Segment: The Cable is In!

> On Jun 26, 2018, at 7:20 PM, Eric Smith via cctalk > wrote: > > On Tue, Jun 26, 2018 at 4:37 PM, Chuck Guzis via cctalk < > cctalk@classiccmp.org> wrote: > >> On 06/26/2018 03:15 PM, Grant Taylor via cctalk wrote: >> >>> I can only guess that having a terminator too close interferes with

Re: Thicknet/10base5 Test Segment: The Cable is In!

> On Jun 26, 2018, at 10:13 PM, Jon Elson via cctalk > wrote: > > On 06/26/2018 06:20 PM, Eric Smith via cctalk wrote: >> On 06/26/2018 03:15 PM, Grant Taylor via cctalk wrote: I can only guess that having a terminator too close interferes with or weakens the signal too much in some

Re: Thicknet/10base5 Test Segment: The Cable is In!

> On Jun 27, 2018, at 12:36 PM, Eric Smith via cctalk > wrote: > > Collision detection was the reason (or at least _a_ reason) why the spacing > of taps on the 10BASE-5 "thick" Ethernet cable was required to be an exact > multiple of 2.5m. It was never clear to me why this was not also a > re

Re: Thicknet/10base5 Test Segment: The Cable is In!

> On Jun 27, 2018, at 1:45 PM, Eric Smith wrote: > > On Wed, Jun 27, 2018 at 10:59 AM, Paul Koning wrote: > > On Jun 27, 2018, at 12:36 PM, Eric Smith via cctalk > > wrote: > > Collision detection was the reason (or at least _a_ reason) why the spacing > > of taps on the 10BASE-5 "thick" Et

Re: Thicknet/10base5 Test Segment: The Cable is In!

> On Jun 28, 2018, at 4:52 AM, Peter Coghlan via cctalk > wrote: > > On 2018-06-27 19:34:38 -07:00, Chuck Guzis via cctalk wrote: >> On 06/27/2018 04:19 PM, Antonio Carlini via cctalk wrote: >> >>> No idea. But on thickwire the taps were all supposed to be made at >>> specifically marked pos

Re: Thicknet/10base5 Test Segment: The Cable is In!

> On Jun 29, 2018, at 7:32 AM, Tony Duell via cctalk > wrote: > > On Fri, Jun 29, 2018 at 9:27 AM, Peter Coghlan via cctalk > wrote: >> On 2018-06-28 at 17:05:32 -0700, Chuck Guzis via cctalk wrote: >> >>> >>> The original standard is very old--it dates form 1960--a very different >>> time

Re: Grounding - was: Thicknet/10base5 Test Segment: The Cable is In!

> On Jun 29, 2018, at 1:01 PM, Chuck Guzis via cctalk > wrote: > > If anyone's wondering, here's a 1975 Bell System treatise on grounding > and protection. Note that carbon-block protection was standard practice: > > http://bellsystempractices.org/500-/518-/518-010-105-i02_1975-09-01.pdf >

Re: Preserved LGP-30

> On Jul 1, 2018, at 10:29 AM, Liam Proven via cctalk > wrote: > > The Moravian Galley in Brno has an exhibition on "Computer Art 1968". > The only actual computer is a very well-preserved German LGP-30. I > took a few photos of it yesterday... and got told off for handling the > paper tape,

GCC for pdp11

Gentlepeople, Once in a while people ask about GCC. It has long had pdp11 support, but it hasn't received much attention. Recently I've done some cleanup on it, and some more is in the pipeline. One notable new feature is that it can now produce proper DEC Macro-11 syntax output. It has lon

Re: GCC for pdp11

> On Jul 13, 2018, at 8:18 PM, Warner Losh via cctalk > wrote: > > On Fri, Jul 13, 2018 at 6:12 PM, Bill Gunshannon via cctalk < > cctalk@classiccmp.org> wrote: > >> >> >> On 07/13/2018 02:32 PM, Paul Koning via cctalk wrote: >>> Gentlepe

Re: GCC for pdp11

> On Jul 14, 2018, at 9:46 AM, David Bridgham via cctalk > wrote: > > Hey, glad to hear of some improvement on GCC for the PDP-11. Last > spring I ended up side-tracked on the QSIC project and working more on > FPGA issues than writing PDP-11 code but that's going to change here at > some po

Re: BASIC (Was: Reading HP2000 tapes

> On Jul 18, 2018, at 1:21 PM, Paul Berger via cctalk > wrote: > > I would think that any interpreted BASIC would do this or for that matter any > interpreted language except maybe for APL which is pretty much written with > tokens anyway. One other exception I can think of is perl which

Re: how good is the data reliability with CD ROM and DVD RAM?

> On Jul 21, 2018, at 3:25 PM, Carlo Pisani via cctalk > wrote: > > ... > and what about magnetic-tapes? (e.g. DDS4, DLT, LTO2) > > which of them lasts for the most? I don't know specifically. I do know that plain old audio tapes may fail -- I have perhaps 100 cassettes recorded in the 19

Re: how good is the data reliability with CD ROM and DVD RAM?

> On Jul 22, 2018, at 8:46 PM, Warner Losh via cctalk > wrote: > > Somewhat of a tangent, but this just popped up for me. > > https://www.theatlantic.com/technology/archive/2018/07/microfilm-lasts-half-a-millennium/565643/ > > and I thought of this thread. Apologies if it's a duplicate.. >

Re: how good is the data reliability with CD ROM and DVD RAM?

> On Jul 22, 2018, at 4:06 PM, Zane Healy via cctalk > wrote: > >> ... > > I’ve failed to see any reason behind your questions. If you’re looking for a > long-term archival solution, look to cloud storage (either on-prem, or > off-prem). Sure tape is cheap, but when you start looking at

Re: RK05 spindle pulleys - trade 50Hz vs 60Hz?

> On Jul 25, 2018, at 9:50 AM, GerardCJAT via cctech > wrote: > > Why don't you simply power it through an inverter that will output 60 Hz, > eventually even "down to" 120 V , true sine wave, of course ??? They are not > that expensive by now. I wouldn't worry about "true sine wave". Tha

Re: RK05 spindle pulleys - trade 50Hz vs 60Hz?

> On Jul 26, 2018, at 9:55 AM, W2HX via cctalk wrote: > > That is not the whole story of 400Hz. The other part of that story is that > now, all of the downstream equipment that uses the 400 Hz can have much > simpler AC to DC power supplies in them. At 400 Hz it is much easier to > regulate

Re: RK05 spindle pulleys - trade 50Hz vs 60Hz?

> On Jul 26, 2018, at 10:54 AM, Anders Nelson wrote: > > To get that power, did they have to use a rotary convertor from 60Hz 3-phase > to get 400Hz? > > https://en.wikipedia.org/wiki/Rotary_converter No, a motor-generator: https://en.wikipedia.org/wiki/Motor–generator. Same purpose, but

Re: RK05 spindle pulleys - trade 50Hz vs 60Hz?

> On Jul 26, 2018, at 11:26 AM, Tony Duell via cctalk > wrote: > > On Thu, Jul 26, 2018 at 4:14 PM, Chuck Guzis via cctalk > wrote: > >> Such MG setups were very common in industry before modern >> semiconductors. When I had a summer job showing movies at a drive-in >> theater (a long time

Re: Epson DECTalk IC

If you want even older technology (that actually worked rather well) there's Votrax, which apparently is still available occasionally. paul > On Jul 26, 2018, at 1:38 PM, Anders Nelson via cctalk > wrote: > > It takes 9600 (8N1) serial input, and I found a forum thread: > > http://w

Re: Epson DECTalk IC

and it handled that fine. :-) paul > On Jul 26, 2018, at 4:07 PM, Henk Gooijen wrote: > > Ahhh yes, I remember the Votrax, SC-01. > There was an other chip that you programmed with phonemes, > the SP0256-AL1 (IIRC). I must have it somewhere, forgot the manufacturer. > >

Re: ISO: Blue (usually) Silicone? tape retainer material

> On Aug 7, 2018, at 9:54 PM, Chuck Guzis via cctalk > wrote: > > Another open-reel tape query for the experts. > > I recall that new tapes would often come with a strip of (usually blue) > silicone-ish tape to retain the end of the tape. I've got a couple of > strips here and I'll swear th

Re: German Translation, Serial Port?

> On Aug 9, 2018, at 9:39 PM, W2HX via cctalk wrote: > > Hello friends. I need a translation from a German manual describing serial > port parameters. I used google translate but it doesn't quite give me the > warm and fuzzy. Anyone here speak German? Here is what it says: > > Betriebsart:

Re: ssh to tweenex.org

> On Aug 10, 2018, at 10:14 AM, Warner Losh via cctalk > wrote: > > On Fri, Aug 10, 2018 at 6:09 AM, Peter Corlett via cctalk < > cctalk@classiccmp.org> wrote: > >> On Fri, Aug 10, 2018 at 02:14:54AM +0200, Stéphane Tsacas via cctalk wrote: >>> Did anyone manage to connect to tweenex,org thr

Re: DEC PDP 11 RK05 DEC custom (?) bootstrap board

Most likely not DEC. The blank handle says as much, and the part numbers you gave are not in the DEC standard format. Also, I would not expect "R-K" in a DEC references to the RK05/RK11. paul > On Aug 29, 2018, at 2:28 PM, Bill Degnan via cctech > wrote: > > I have what I believe t

Re: DEC PDP 11 RK05 DEC custom (?) bootstrap board

> On Aug 30, 2018, at 10:52 AM, Bill Degnan via cctalk > wrote: > > On Thu, Aug 30, 2018, 8:18 AM Noel Chiappa via cctalk > wrote: > >>> From: Bill Degnan >> >>> I am curious how I'd attempt to use one of these. Any thoughts? >> >> I'd start by dumping and disassembling. >> >> (If you ne

Re: Thicknet/10base5 Test Segment: The Cable is In!

I understand 10Base5 cable being limited, though regular 50 ohm coax generally works fine if you work around the lack of stripes. AUI cable, though, that doesn't seem much of a problem. Straightforward N pair twisted pair cable, terminated with DA15 connectors. The slide locks are not quite c

Re: Thicknet/10base5 Test Segment: The Cable is In!

> On Aug 31, 2018, at 2:45 PM, systems_glitch wrote: > > Yeah, you can make up your own AUI cables with less-than-spec wire and get > away with it no problem, but I was referring to NOS premade AUI cables being > a limited resource. > > I've made them with DA15s and CAT5 cable before, and i

Re: Thicknet/10base5 Test Segment: The Cable is In!

> On Aug 31, 2018, at 3:07 PM, systems_glitch wrote: > > Yeah, I forget what the original allowed length was for drop cables, but I > seem to remember it striking me as quite long! A few feet of CAT5 (or even > better, STP) has a lot of wiggle room :P 50 meters, says IEEE 802.3. pa

Re: Thicknet/10base5 Test Segment: The Cable is In!

> On Aug 31, 2018, at 3:25 PM, Grant Taylor via cctalk > wrote: > > On 08/31/2018 01:07 PM, systems_glitch via cctalk wrote: >> Yeah, I forget what the original allowed length was for drop cables, but I >> seem to remember it striking me as quite long! A few feet of CAT5 (or even >> better,

Re: Thicknet/10base5 Test Segment: The Cable is In!

> On Aug 31, 2018, at 3:32 PM, systems_glitch wrote: > > Allied Telesis made a "multi port tap" that provided four AUI ports off a > single Ethernet tap. I don't know if it was a repeater/hub inside, or what. > It was much smaller than a DELNI or DEREP. That's not surprising. The DEC boxes

Re: VAX 11/785 "Superstar" Backplanes

> On Sep 5, 2018, at 10:11 AM, allison via cctech wrote: > > On 09/05/2018 01:53 AM, Paul Birkel via cctech wrote: >> On the 'bay: 183405165416 and 183405165414 "Scrap / Gold Recovery" >> >> >> >> Six total. One wonders what the scrappers did with the rest, and where they >> came from giv

Re: VT100's

> On Sep 6, 2018, at 12:22 PM, Grant Taylor via cctalk > wrote: > > On 09/06/2018 09:37 AM, Carlo Pisani via cctalk wrote: >> cause it's the simples, I guess > > I used to naively think that the VT100 was the lowest end Video Terminal. > Then I subsequently saw references to VT50 and VT52.

Re: VT100's

> On Sep 6, 2018, at 1:09 PM, allison via cctalk wrote: > > On 09/06/2018 12:54 PM, Al Kossow via cctalk wrote: >> >> On 9/6/18 9:48 AM, Paul Koning via cctalk wrote: >>> VT50 seems like it was someone's mistake -- 12 lines, what were they >>>

Re: VT100's

> On Sep 6, 2018, at 3:14 PM, Carlo Pisani via cctalk > wrote: > >>> cause it's the simplest, I guess >> The VT100 was quite complicated compared to contemporary terminals at the >> time of its introduction. > > why do you say that? > a vt100 terminal requires only a text VDU (video display

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