[cctalk] Re: FW: Re: ADM3a screen rot.

On 29/01/2024 20:45, William Sudbrink via cctalk wrote: Sellam Abraham wrote: I think you were fine. That's how you discharge them anyway. You were just missing the grounding wire :) I'd rather not be the electron sink In this case. I've never taken a hit off of a CRT have you? Yes,

[cctalk] Re: One of Paul Allen's Museums

On 24/04/2023 06:45, ED SHARPE via cctalk wrote: Bad link  Zane I get a weird  screen from the timeEd# Delete the strange character after the last "/" and it will work: https://www.seattletimes.com/business/boeing-aerospace/after-3-years-flying-heritage-museum-to-reopen-in-everett/ -- Pete

[cctalk] Re: flipchip cleaning and pin corrosion inhibition

On 23/04/2023 22:52, KenUnix via cctalk wrote: Pete, Did the 8E have core or solid state memory? It had both, but I didn't put the core boards in the dishwasher. I figured they might be too delicate for that, so I rinsed them by hand in the kitchen sink. I should have said that in my

[cctalk] Re: flipchip cleaning and pin corrosion inhibition

On 23/04/2023 17:54, Fritz Mueller via cctalk wrote: I’ve been eying the dishwasher, for the subset of flip chips that that are just DIP logic, carbon comp resistors, and ceramic bypass caps, anyway. But I haven’t been brave enough to try that yet... Most of the logic here has date codes

[cctalk] Re: WTB: Acorn A3010 or A4000

Hi, Ethan, Whereabouts are you? I'm in York, UK, and I have more than one spare BBC Micro. I don't have an A3010 but I do have an A3020 (red function keys) if that's of interest. On 09/02/2023 16:13, Ethan O'Toole via cctalk wrote: Looking for an Acorn A3010 or A4000 + KB/Mouse, happy to

[cctalk] Re: RQDX3's: Lessons learned.

On 04/02/2023 14:37, Glen Slick via cctalk wrote: On 2023-02-03 22:48, Chris Zach via cctalk wrote: Is it just the ROMs, or also some HW changes? Do we have backup of the newer versions? http://www.dunnington.info/public/DECROMs/ http://www.dunnington.info/public/DECROMs/ROMlist It's just

[cctalk] Re: SGI vs. Mac

On 24/12/2022 17:02, Chris via cctalk wrote: Don"t know what an Elan is. I do seem to recall suddenly an Indy with no graphics output, intended to be used as a headless server. That was a Challenge. the Indigo Elan is an Indigo with a particular higher-end graphics card. I still have an

[cctalk] Re: Whitechapel Computer Works

On 04/11/2022 17:47, Jonathan Katz via cctalk wrote: Hi everyone! I'm curious; other than Wikipedia what do we know about Whitechapel workstations? Do any of us have some working in our collections, with software, disk dumps, etc? Jim Austin has 4 or 5 MG1s and a CG1 in his collection.

[cctalk] Re: Flipping an 8" diskette

On 01/09/2022 14:31, Kenneth Gober via cctalk wrote: On 5.25" diskettes punching a notch to enable use of the second side worked due to 2 factors: First, the index hole was commonly unused on 5.25" systems so it didn't matter that the index hole was in the wrong place when the diskette was

Re: Unrecognized DEC Power Supply in PDP-11/44 Configuration

On 02/12/2021 16:37, Josh Dersch via cctalk wrote: On Thu, Dec 2, 2021 at 6:29 AM pbirkel--- via cctalk wrote: Does anyone recognize the (presumably) DEC power supply on the front half of the rack-bottom in the 11/44 listing at: It's not a DEC power supply, it's a Fujitsu power supply,

Re: Setting up a VMS system

On 23/09/2021 14:23, Paul Koning via cctalk wrote: On Sep 23, 2021, at 9:12 AM, Scott Quinn via cctalk wrote: ... Isn't VMS DCL pretty close to RSX? Never used RSX, but that is what I was always told. I don't know how close it is to RSX, but I do know that RSTS (V9 and later) DCL was

Re: PDP-11/73 boot issues

On 21/09/2021 20:34, Chris Zach via cctalk wrote: Can an MXV11 be used in a 22 bit system? I thought it was an 18 bit device? MXV11-B is 22-bit. MXV11-A is 18-bit but supposedly can be used in a 22-bit system if the RAM is disabled. -- Pete Pete Turnbull

Re: Unix or BSD for Dec PDP 11/34 and 11/45

On 17/09/2021 12:37, devin davison via cctalk wrote: I'm working to get my pdp 11/34 and 11/45 running. I was curious what versions of unix or bsd would work on the machines i have. I wanted to set up the systems with a bunch of dumb terminals and show them off at a local maker fair. 7th

Re: 3d modelling software

On 23/08/2021 17:29, Rob Jarratt via cctalk wrote: I think I may need to get a small part 3d printed (some plastic board mounting guide rails from a PDP 11/24 H7140 PSU). What software is best for a novice? Preferably free! The hobbyist version of Fusion 360 is free. It's what I use. I've

Re: Apple II PSU

On 10/05/2021 23:31, Adrian Graham via cctalk wrote: Just me that reaches for a 2mm drill then? Probably. I usually use 3mm or 1/8". I've taken more than one Apple PSU apart that way, long ago. -- Pete Pete Turnbull

Re: Hard To Believe This Person Is Serious

On 26/03/2021 09:15, Antonio Carlini via cctalk wrote: This, for example, is clearly his last piece of "blanc" paper: https://www.ebay.co.uk/itm/Blanc-sheet-of-paper-04/254895244594 (or maybe it's French paper ...) :-) Possibly a test post to check how the system works. Years ago, eBay had

Re: FW: List your old computer

On 24/02/2021 23:02, stan via cctalk wrote: By any chance, are you thinking of uptimes.net? Some years ago (early 2000's?) it was tracking systems uptimes. I had an Alpha  system talking to it at one time. IIRC, the record at one time was a VAX cluster, with an uptime of 1200+ days. Windows

Re: OT: pints, pounds (Was: APL\360

On 01/02/2021 20:24, Chuck Guzis via cctalk wrote: Thank heavens that the Brits didn't come out with the 5150--we might have had to deal with Whitworth (BSW) fasteners. Nah, too many of them are similar to UNC/UNF, which would have just caused confusion. We'd have used BA sizes. -- Pete

Re: OT: pints, pounds (Was: APL\360

On 01/02/2021 20:07, Fred Cisin via cctalk wrote: A US pint of water weighs 1.043 pounds. One "fluid ounce" (volume) of water weighs 1.043 ounces (weight)! That's also a US measure. An imperial fluid ounce is 28.4ml and a floz of water weighs 28.4g, same as an avoirdupois ounce. In fact

Re: UNIVAC

On 29/01/2021 15:51, Bill Degnan via cctalk wrote: I have learned that Bakelite insulating is phenol and formaldehyde with embedded asbestos. Does anyone have any Bakelite insulation in any of their vintage computers? *Some* Bakelite contains asbestos. The primary filler is commonly wood

Re: DEC PDP-8/E wanted

On 20/11/2020 16:55, ED SHARPE via cctalk wrote: Go for a 8m or f  same omnibus and easer to lift as only onevnibuss panel!  - Also a switchmode PSU which is much lighter than the -8/E linear supply. But the -8/M normally has the minimal panel with the power key and minimal toggle switches.

Re: Osborne 1 keyboard repair - success!

On 20/11/2020 17:59, Tom Hunter via cctalk wrote: Hi Patrik, As to the superglue - it was the only option because the prongs are just melted flat. To get the key mechanism out or off I had to scrape all the melted plastic off. I then subsequently re-attach the key mechanism to the aluminium

Re: Firing up the pdt11

On 13/10/2020 22:28, Chris Zach via cctalk wrote: Then I guess the question rattling around my brain is "How did I get this Elephant Memory systems disk formatted?" RX01 format is a standard IBM format used by many systems, including many CP/M ones, so it was possible to buy pre-formatted

Re: Osborne 1 keyboard repair?

On 21/09/2020 12:41, Tom Hunter via cctalk wrote: The problem I am seeing is that 3 keys ("h", "j" and "y") are permanently pressed. I'm not familiar with this keyboard, so despite having fixed lots of other types, what I'm about to write is no more than musing and may be inapplicable

Re: Synchronous serial Re: E-Mail Formats RE: Future of cctalk/cctech

On 18/06/2020 21:31, Paul Koning via cctalk wrote: I did see something vaguely similar. Bell 202 modems are 1200 baud FSK, so on a voice channel they normally are 1200 bps half duplex. They can also be hooked up to 4-wire fixed circuits. But they have a reverse channel, good for 150 baud

Re: mail on spool as G-d intended was Re: Future of cctalk/cctech

On 18/06/2020 23:03, Eric Korpela via cctalk wrote: I used to use netcat, but now I just watch an oscilloscope. Reminds me of a cartoon in a HiFi mag several years ago. Enthusiast talking to friend in front of dual 'scopes, "Why listen to it when I can see it's perfect?" -- Pete Pete

Re: Microsoft open sources GWBASIC

On 27/05/2020 11:55, Peter Corlett via cctalk wrote: It's better now, though. Price differences can be explained by delivery costs, import duties, and VAT/sales tax. And in the case of 1977, middlemen who exploit the difficulty in importing stuff oneself. The USA is some sort of gravity well

Re: Keyboard inverters/converters for terminals

On 22/05/2020 17:21, Fred Cisin via cctalk wrote: #> 3.0" drives (Amdek, Amstrad, etc.) use same connectors as "standard" 5.25", with "molex" power connector (I don't know what the CORRECT name is for that connector). It's part of the AMP (now TE) Mate-N-LOK series. But, I have some 3.25"

Re: DEC QBUS Backplanes

On 17/04/2020 17:52, Bill Gunshannon via cctalk wrote: I found a backplane.  It says Digital on it but does not  have an H- number.  I also don;t find it listed in any  of the lists I can find on the web. It has 8 A-B slots and 4 C-D slots.  the Four C-D are on the bottom half of the

Re: OT: Weller soldering irons

On 06/04/2020 00:22, Jon Elson wrote: On 04/05/2020 03:32 PM, Pete Turnbull via cctalk wrote: A few hours ago I started looking at three "smart" light switches that need LEDs replaced, and switched on the soldering iron, and ... nope. It's a Weller WP80 and it seems the sensor in t

OT: Weller soldering irons

A few hours ago I started looking at three "smart" light switches that need LEDs replaced, and switched on the soldering iron, and ... nope. It's a Weller WP80 and it seems the sensor in the heating element has died. I discovered that only after resetting and then dismantling the control unit

Re: Design flaw in the SCSI spec?

On 08/01/2020 18:06, Paul Koning via cctalk wrote: Allowing accountants to do electrical engineering makes just as much sense as allowing sociologists to do brain surgery. Off topic, but allowing accountants to do accountancy isn't always much better. I recall the Christmas when our

Re: Two dead LK201 keyboards

On 28/12/2019 01:46, Paul Koning via cctalk wrote: I can get one and test it with an Apple keyboard, but that doesn't sound right. There aren't enough wires on a USB connector to allow you to speak the PS/2 protocol. And there are PS/2 to USB adapters (for old keyboards) that are the same

Re: Introduction and need help bringing some pdp11's back

On 29/10/2019 16:28, Chris Zach via cctalk wrote: The real problem is I'm trying to put an RQDX3 in there instead of the ESDI controller so I can boot off RX50's. And I have no idea which way all the various ribbon cables are supposed to go. Will any 50 pin cable work between the RQDX3 and the

PDP-8/E MM8-E jumper settings

I've lost track of where the jumper settings are documented for the MM8-E, and I've got five sets here that have all been changed one way or another. Can anybody remind me where to find the settings for the three EMA jumper links on the G111? I want to set at least one board set to the lowest

Re: Cleaning an old keyboard

On 25/09/2019 16:29, Noel Chiappa via cctalk wrote: If the reference is to: Lloyd S. Swenson, James M. Grimwood, Charles C. Alexander; "This New Ocean: A History of Project Mercury"; SP-4201; NASA; Washington; 1966 It is indeed in that. My copy isn't to hand and if it's not

Re: Cleaning an old keyboard

On 24/09/2019 07:30, Philip Belben via cctalk wrote: PS I wish people wouldn't say WD40 is not a lubricant. It is. The problem is that it is quite a heavy grease - suitable for (say) door hinges - but when it comes out of the can it looks like a fine oil I do wish people wouldn't say WD40 is

Re: RSTS collection in the UK

On 27/06/2019 07:53, Dave Wade wrote: Pete, Am I right in thinking Jim has no scanning facilities, and access is still one weekend in two. Pretty much. -- Pete Pete Turnbull

Re: RSTS collection in the UK

On 26/06/2019 22:52, Al Kossow via cctalk wrote: On 6/26/19 1:00 PM, Dave Wade wrote: Could we forward to the UK DecTech list? Let's see if Pete Turnbull is able to make contact I have, but I've not yet made any arrangement to collect it all. It could be postponed until late July as the

Re: RSTS collection in the UK

Hi, Al. This sounds slightly familiar - Jay contacted me a year or two ago about a similar lot but the donor never got back to me. Anyway, I would be happy to collect these on behalf of Jim Austin, for the Computer Sheds: http://www.computermuseum.org.uk/ We'd be particularly interested in

Re: Network cards and Win98SE

On 14/05/2019 14:17, John Foust via cctalk wrote: At 03:02 AM 5/14/2019, Christian Corti via cctalk wrote: On Mon, 13 May 2019, Grant Taylor wrote: "Gaming adapters" take a wired computer and connect it to a wireless network. That "adapter" has always been called a WLAN or wireless bridge.

Re: Network cards and Win98SE

On 13/05/2019 23:47, Grant Taylor via cctalk wrote: On 5/13/19 3:58 PM, Chuck Guzis via cctalk wrote: I don't want to get into a long discussion; I merely wanted to point out that you're unlikely to find the term "gaming adapter" in Linux tech docs as they're not written for that audience.

Re: TMSCP docs?

On 13/05/2019 08:51, Matt Burke via cctalk wrote: The protocol specification for MSCP and TMSCP is available here: http://www.bitsavers.org/pdf/dec/dsa/mscp/ You might also want to look at the implementation of MSCP and TMSCP in Simh: https://github.com/simh/simh/blob/master/PDP11/pdp11_rq.c

Re: RT-11 doesn't recognize my 3.5" floppy

On 06/05/2019 23:38, John Forecast via cctalk wrote: The release notes on bitsavers indicate that the RX33 was not supported until RT-11 V5.04. On May 6, 2019, at 6:20 PM, Charles via cctalk wrote: I have installed an RQDX3 But, when I boot the system (with RT-11SJ V5.01), it can't see

Re: Service for converting CD-ROMs into ISO files?

On 04/05/2019 21:36, Dave Wade via cctalk wrote: Paul, VAX CD-ROMS generally are not ISO. ISO implies the ISO9660 file system, but many VAX CD ROMS are in native VMS Files-11 format. Some Windows utilities don't handle these so you need third party software to create an image of these CD's.

Re: RS2030 MIPS workstation

On 04/05/2019 01:54, Al Kossow via cctalk wrote: I see we all were talking about the M2030 around 3 years ago http://www.classiccmp.org/pipermail/cctech/2016-May/017829.html Some useful information in there, but I have the original MIPS keyboard and mouse. -- Pete Pete Turnbull

Re: RS2030 MIPS workstation

On 04/05/2019 02:54, Al Kossow via cctalk wrote: On 5/3/19 3:22 PM, Pete Turnbull via cctalk wrote: Anyone know much about early MIPS workstations? RISCos 4.52 src, incl monitor src up now under http://bitsavers.org/bits/MIPS/RISCos Once I can get the machine to stop wailing

Re: RS2030 MIPS workstation

On 04/05/2019 01:04, Al Kossow via cctalk wrote: On 5/3/19 4:25 PM, Al Kossow via cctalk wrote: So I'd like to know what the RAM spec really is, whether I need to reprogram the Dallas chip (and if so what goes where), and what the diagnostic numbers on the internal LED mean.  Anyone? I

RS2030 MIPS workstation

Anyone know much about early MIPS workstations? I'm trying to get a MIPS RS2030 to boot, without much luck so far. It goes through the selftest but stops with the internal LED display at "5" accompanied by a continuous beep. Known problems: - The Dallas DS1287 battery is flat; I can hack a

Re: Mounting HP7970e 9-Trk 1/2" Tape Drive

On 05/02/2019 20:59, Chuck Guzis via cctalk wrote: On 2/5/19 12:19 PM, Jack Harper via cctalk wrote: I learned that very quickly - If you open the front of the Drive and swing out the door with the electronics, drive motors etc, it is definitely heavy enough to tip a rack. I bolted the

Re: PDP-11 Memory

On 12/01/2019 17:39, Bill Gunshannon via cctalk wrote: One confusing part of this. Everything I have read today seems to say that the only difference between the 11/73 and the 11/83 in a MicroPDP-11 was the memory used. QBUS = 11/73 PMI = 11/83 Is this correct or not? No, not really, but

Re: PDP-11 Memory

On 12/01/2019 01:24, Zane Healy via cctalk wrote: I’m pretty sure you could get the /23+, /53, /73, /83, and /93 in either a BA23 or a BA123. I have an actual badged BA23 pedestal for my /23+. I'm fairly certain all microPDP-11/23+ systems were only sold in BA23 boxes, and I think

Re: PDP-11 Memory

On 11/01/2019 23:58, Ethan Dicks via cctalk wrote: On Fri, Jan 11, 2019 at 3:51 PM Bill Gunshannon via cctalk wrote: Mine are all BA23. Wasn't the BA123 for the MicroVAX? As sold, most likely. I don't think DEC ever configured any MicroPDP systems in a BA123 but no reason it doesn't work.

Re: PDP-11 Memory

On 11/01/2019 19:59, Bill Gunshannon via cctalk wrote: MicroPDP box has first three slots A-B-C-D to support PMI memory and the rest are serpentine A-B. Even giving a bus grant problem, I can't see that causing a CSR error. I will probably have to dig out another box this weekend just to be

Re: Bogus "account hacked" message

On 08/01/2019 21:37, alan--- via cctalk wrote: There is a special place in hell for spammers.  There is an even more special place lower in hell for web site builders that store plain-text passwords rather than a one-way salted hash of a password. Oh, there's a worse hell -- I hope -- for

Re: PDP-8/e

On 08/12/2018 09:55, Rod G8DGR via cctalk wrote: Nice try Josh - close – you have to change the crystal first and you can’t get them. Both Farnell and Mouser UK have suitable crystals. They don't have to be the same physical size. I've changed several. -- Pete Pete Turnbull

Re: PDP-8/e

On 07/12/2018 17:46, Jon Elson via cctalk wrote: On 12/07/2018 11:38 AM, Rod G8DGR via cctalk wrote: Oh good how do you set them to 110 baud? Oh, WOW!  Good catch, it only goes down to 300 baud!  major screwup, ought to be reported to the developers. But wouldn't it be better to set the

Re: PDP-8/e

On 07/12/2018 17:44, Jon Elson via cctalk wrote: On 12/07/2018 11:22 AM, systems_glitch via cctalk wrote: Indeed, unless you need character pacing. Actually, with the correct settings of the serial port (xon/xoff or CTS pin) the serial port driver should do this, too, so cat would work. A

Re: PDP-8/e

- Guy On Dec 7, 2018, at 4:57 AM, Pete Turnbull via cctalk < cctalk@classiccmp.org> wrote: On 07/12/2018 09:59, Rod G8DGR via cctalk wrote: OK now I need a little help. Does anybody know of a terminal emulation program that will simulate the reader on an ASR33? I know about RIM and

Re: PDP-8/e

On 07/12/2018 09:59, Rod G8DGR via cctalk wrote: OK now I need a little help. Does anybody know of a terminal emulation program that will simulate the reader on an ASR33? I know about RIM and BIN loaders but how and what to feed them I have long forgotten For a Unix or Linux machine,

Re: [rescue] Sun2/120 SunOS 3.2 suntools movie

On 06/12/2018 12:28, Liam Proven via cctalk wrote: Looking up the SUN-1, I see that it lacked a graphics adapter, and was a text-only machine. I didn't know that. That alone means that it's not really what I think of when I think of a Sun workstation: no windowing system means that for me it's

Re: [rescue] Sun2/120 SunOS 3.2 suntools movie

On 06/12/2018 11:44, Tony Duell via cctalk wrote: On Thu, Dec 6, 2018 at 11:19 AM Liam Proven via cctalk wrote: On Wed, 5 Dec 2018 at 23:12, Chris Hanson wrote: It’s a Sun-2 so it’s not really arguable whether it’s the first ever Sun workstation: It’s not. But I am mildly curious what

Re: George Keremedjiev

On 21/11/2018 22:46, Bill Gunshannon via cctalk wrote: On 11/21/18 5:19 PM, Fred Cisin via cctalk wrote: Ed, It is YOUR mail program that is doing the extraneous insertions, and then not showing them to you when you view your own messages. Seriously, YOUR mail program is inserting extraneous

Re: Large Collection Of Dec/Digital PDP Documentation

On 06/11/2018 21:45, Zane Healy via cctalk wrote: On Nov 6, 2018, at 10:57 AM, Brian L. Stuart wrote: Isn't RT-11 V4 orange? I'll have to check when I get home, but I'm pretty sure that's the set I have. (That and a blue binder set for V3 and a loose set of V2.) You might be right, my

Re: Single-height Qbus grant continuity PCB

On 14/08/2018 16:52, Tony Duell via cctalk wrote: But I have here a little square board (the same size as the older Unibus grant continuity card) with just 2 pairs of pins linked. In the etch is a Digital logo (so I assume it's a real DEC product) and: LSI11 Grant Continuity G7272 5012564B

Re: Needing help fixing an irix boot disk

On 05/07/2018 10:08, Mazzini Alessandro via cctalk wrote: Long story short, a while ago I cloned the hd of a Fuel I got given (6.5.16, original installation from an iconic car designer, Bertone), and all was ok. The original hd was then left in place but unpowered, the cloned was upgraded to

Re: DEC FPJ11-AA

On 02/07/2018 14:17, Bill Gunshannon via cctalk wrote: On 07/02/2018 08:34 AM, Pete Turnbull via cctalk wrote: Bill would want the -JD (2MB) version (the -JE version is 4MB so too big). Or a pair of the 1 meg ore did they go away before the 11/93 came out? My oopsie; the MSV11-J is either

Re: DEC FPJ11-AA

On 02/07/2018 03:38, Noel Chiappa via cctalk wrote: > From: Bill Gunshannon > Anybody have any PMI memory modules they might let go for less than my > first born male child? The DEC PMI memories are the MSV11-J and (I think) the MSV11-R. The latter is rare, but the -J's can be

Re: DEC FPJ11-AA

On 01/07/2018 18:14, Bill Gunshannon via cctalk wrote: Speaking of PMI  Anybody have any PMI memory modules they might let go for less than my first born male child?  I have one 11/93 with 2 Meg and would love to bring it up to full memory. If you really mean 11/93 (as opposed to, say,

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

On 29/06/2018 14:31, Paul Koning via cctalk wrote: Yes, and the specified distance limit for RS232 is quite short, 50 feet or so. People have used RS232 over longer distances, of course, and gotten away with it. The RS-232-C standard doesn't actually specify a maximum distance. Section 3.1

Re: ISO: DECtape controller

On 16 May 2018, at 08:37, Josh Dersch via cctalk wrote: >I was fortunate enough to acquire a TU56 this week, along with a TD8E >controller.  However, the TU56 lacks the G888 flip-chips necessary to work >with the TD8E; I know these parts are in short supply, but in the

Re: 8085 Dissasembly?

On 17/04/2018 14:25, Warner Losh via cctalk wrote: On Tue, Apr 17, 2018 at 7:12 PM, Johnny Eriksson via cctalk < cctalk@classiccmp.org> wrote: Bill Gunshannon wrote: Many of us think that the advent of the x86 architecture is what led to masochism. ... or masochism led to the x86

Re: SGI Indy power supply: identify this diode?

On 26/03/2018 17:07, Pete Turnbull via cctalk wrote: Except it's not a zener, or at least not anything like those [ones Camiel and Bob suggested]. I took one out of another (working) supply, and I can tell it has a forward voltage of 0.2V, so it's presumably a Schottky diode of some sort. I

Re: Identifying an aluminum panel

On 31/03/2018 02:32, Kyle Owen via cctalk wrote: I feel like I should know what this panel goes to...I found it in my garage when cleaning up. Any ideas? http://i.imgur.com/u4LMNqE.jpg The shape, apparent size, and the bends and screw holes make it look remarkably like the bottom panel of my

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

On 29/03/2018 05:26, Shaun Halstead via cctalk wrote: Using the wrong filament orientation can cause some weird artifacts to appear on scanned images, because of the high magnification. I strongly suspect that an attempt using an LED source would face similar (and possibly worse) issues.

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

On 29/03/2018 03:15, Zane Healy wrote: More and more, I view my Classic Computer collection as a hinderance to building a proper darkroom. Oddly enough, the main purpose of my PDP-11/44 these days is to hold a couple old enlargers that I don’t use. LOL! I wish I still had my De Vere 5x4

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

On 29/03/2018 00:19, Zane Healy via cctalk wrote: I think Bellows would be the only sane way to approach this. You could do it with extension tubes, but they’re a pain. Another thing to consider is a light source. You’re going to need a fair amount of light, given the necessary extension to

Re: SGI Indy power supply: identify this diode?

On 26/03/2018 17:39, et...@757.org wrote: I'm hoping I don't have to breadboard a 1kV supply and find a lot of multi-megohm resistors to try and estimate the breakdown voltage - and then guess at the forward current rating. Is it possible to get the schematics? If only! That question has

Re: SGI Indy power supply: identify this diode?

On 26/03/2018 16:08, Camiel Vanderhoeven wrote: 4B would be a 2.2V zener; 4A would be a 2.0V zener, so that’s odd indeed... That's the idea I had... Except it's not a zener, or at least not anything like those. I took one out of another (working) supply, and I can tell it has a forward

SGI Indy power supply: identify this diode?

After a recent power cut and a series of glitches as the power was restored, one of my Indys suffered a PSU failure. It's a Sony APS-81 171W unit, SGI P/N 060-0008-001. I've found half a dozen damaged parts, and I've identified a 150R 1W metal film resistor (R135), two trannies (Q105, a

Re: PDP8/e programmers consoles

On 17/03/2018 00:28, Charles Dickman via cctalk wrote: So the PDP8/e used the KC8-EA programmers console which has incandescent indicator lamps and the PDP8/f used the KC8-FL programmers console which has LED indicator lamps. I have two 8/e machines, one of which has the original panel with

Re:

On 30/01/2018 15:17, Tapley, Mark via cctalk wrote: Does Isopropyl alcohol (um, same as propan-2-ol?) at 60C have enough vapor pressure to be a flammability issue? Yes. The boiling point of IPA is a little over 80C, and the flash point of 70% - 80% IPA (which would be a common strength) is

Re: DEC H960 stabiliser feet. Have some questions.

On 07/01/2018 07:57, Steve Malikoff via cctalk wrote: I can't find anything suitable on MMC (https://www.mcmaster.com/#countersunk-head-machine-screws/=1b0p4yz ) so Chuck's probably right, machine them up. Maybe start from a long 5/16" shank hex-head bolt and put the countersink and 1/4-20

Re: DEC H960 stabiliser feet. Have some questions.

On 07/01/2018 01:44, Chuck Guzis via cctalk wrote: On 01/06/2018 04:54 PM, Pete Turnbull via cctalk wrote: No, as would be obvious to anyone looking carefully at the photo (or the real thing!), it's 1/4" x 20 UNC.  I really must learn to think before putting finger to keyboard. If

Re: DEC H960 stabiliser feet. Have some questions.

Sigh. Third time lucky. On 06/01/2018 16:11, Pete Turnbull via cctalk wrote: Correction - it's 10-32.   I found one of the screws, photo at http://www.dunnington.cx/DEC/H960/kickplate/IMG_1006.JPG No, as would be obvious to anyone looking carefully at the photo (or the real thing!), it's 1

Re: DEC H960 stabiliser feet. Have some questions.

On 06/01/2018 15:45, Pete Turnbull via cctalk wrote: On 06/01/2018 12:04, Steve Malikoff via cctalk wrote: Using the measurements provided by Vince I've rejigged the drawing a bit and it ought to be closer. Looks good to me except... I had thought the hole in the front corner of the H960

Re: DEC H960 stabiliser feet. Have some questions.

On 06/01/2018 12:04, Steve Malikoff via cctalk wrote: Using the measurements provided by Vince I've rejigged the drawing a bit and it ought to be closer. Looks good to me except... I had thought the hole in the front corner of the H960 was for a front panel pivot, but it seems the foot

Re: Old DEC PROM Images

On 02/12/2017 09:11, Mattis Lind via cctalk wrote: 2017-12-01 19:16 GMT+01:00 Bill Gunshannon via cctalk

Re: PDP-8 chassis on eBay

On 07/11/2017 15:09, william degnan via cctalk wrote: The seller in the past sold an 8i I believe, it's probably an 8i. Bill On Tue, Nov 7, 2017 at 10:00 AM, Dave via cctalk wrote: Can you tell which PDP8 this goes with? Would an 8/e panel fit? Dave It's an 8/e (of

Re: The origin of the phrases ATA and IDE [WAS:RE: formatting MFM drives on a IBM PC]

On 03/10/2017 01:04, Tom Gardner via cctalk wrote: Unfortunately there is no documentation to support Pete's recollection - if there is any I would like to see it. Well, actually, there is, though not for quite as early as I had those conversations. The company I was referring to was HCCS

Re: The origin of the phrases ATA and IDE [WAS:RE: formatting MFM drives on a IBM PC]

On 01/10/2017 20:46, Tom Gardner via cctalk wrote: As best I can tell WD began publically using the term IDE for its drives sometime around 1990 Nope. I recall conversations with a small-scale developer in the UK who was creating addons and accessories for the company I worked for (Acorn

Re: Tips For Soldering a Surface Mount PLCC Socket

On 10/09/2017 20:55, Rob Jarratt via cctalk wrote: I want to replace a PLCC84 surface mounted chip and take the opportunity to socket it. I have looked at some YouTube videos to see how others have done this. I am thinking that the best way is going to be to pre-solder the pads on the socket,

Re: DEC ll/03 in 22 bit backplane

On 30/08/2017 17:02, Douglas Taylor via cctalk wrote: On 8/30/2017 5:53 AM, Pete Turnbull via cctech wrote: Hope this helps... Yes, it does help. There are 3 issues that I am trying to resolve: 1. Running in 32kb of memory. If I use the 32kb MXV11 can I run RT11 V5.3? If it works in

Re: HP Draftmaster I, Power Supply repair

On 30/08/2017 11:44, Camiel Vanderhoeven via cctalk wrote: I believe that is true for some countries, in other countries they did increase the voltage. I know it happened in the Netherlands, because we measured the voltages at our university¹s datacenter over that period. We (I'm in the UK)

Re: DEC ll/03 in 22 bit backplane

On 30/08/2017 05:29, Douglas Taylor via cctalk wrote: I'll send along a picture of the rear of the back plane. I'm getting the impression I can't do what I want with the old cpu cards, M7270 and M7264. I had really hoped to be able to put together a simple system to demonstrate the

Re: This Is Such An Exciting Listing!

On 19/08/2017 00:46, Adrian Graham via cctalk wrote: It doesn’t beat a listing from 15 or so years ago from a mate of mine who advertised a polo mint (lifesavers to our US types) in a clear case as ‘mint in box (mint, in box)' Who remembers the sale of the air guitar? -- Pete Pete Turnbull

Re: pdp-8/e restoration.

On 07/08/2017 18:37, Rod Smallwood via cctalk wrote: So to-morrow connect up a terminal that will do 110 baud and try an echo test. Next part is interesting. There should be a way to fake a reader / punch and feed in tape images. There is. Look on Kevin McQuiggin's site:

Re: DECstation 220 - Out of Ideas?

On 25/06/2017 11:46, Rob Jarratt via cctalk wrote: I have done a bit more tracing of components and have come across a possibly anomaly. The signal that won't go low enough goes to the input (pin 2) of a 74LS125 buffer. As soon as I saw "74LS125" I thought, "Oh, yes, another one". That's a

Re: RL02 Cables

On 20/06/2017 09:06, Aaron Jackson via cctalk wrote: I think I have seen this too, and was actually beginning to wonder if a box with the clunky connector was the only "official" way of doing it. I believe I read somewhere about bypassing the connector on the back of the drive and going straight

Re: sticky copies and laser prints

On 06/06/2017 23:58, David Griffith via cctalk wrote: Often when I comb through old documentation, I find that the years, heat, and pressure appear to have remelted the toner such that pages get stuck together. Is there a danger of that happening with modern toners? Yes. Toner composition

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