CF cards as storage - wear leveling

I just bought an IDE-CF adapter the other day with the intention of replacing the spinning rust in my disk imaging system (which is some early/mid-90s 80486-based thing). However, the CF entry on Wikipedia says: "Most CompactFlash flash-memory devices limit wear on blocks by varying the

Re: Intellivision reset switch

On 04/02/2017 08:51 PM, drlegendre . wrote: If the unit was otherwise working as-found, then it might be safe to say that whatever +was+ under that button +must+ have either disintegrated or fallen out of place, yet evidence should remain. In either case, you should find evidence - crumbled,

Intellivision reset switch

Can anyone who's been inside an Intellivision confirm that there's supposed to be a little foam disc beneath the reset switch plate? I picked a system with a box of cartridges up earlier, half expecting the machine to be dead (I was figuring it was going to be a blob of

Re: I hate the new mail system

On 02/28/2017 07:43 PM, Chuck Guzis via cctalk wrote: On 02/28/2017 05:21 PM, Jon Auringer wrote: Chuck, I had the same display issue. Uncheck "Show only display name for people in my address book" under Tools-Options-Display-Advanced. Jon, Thanks for the hint! I'm using the Linux version

Compaq Portable 286 and Portable III - IDE drives?

Just checking here, as someone told me that this is the case, but do the Compaq Portable 286 and Portable III take stock 40-pin IDE hard drives? I just wanted to make sure that they weren't expecting something that might be a bit non-standard before I go trying to find modern replacements for

Re: Compaq Portable 286 and Portable III - IDE drives?

On 03/03/2017 03:08 PM, Fred Cisin via cctalk wrote: On Fri, 3 Mar 2017, Jules Richardson via cctalk wrote: Just checking here, as someone told me that this is the case, but do the Compaq Portable 286 and Portable III take stock 40-pin IDE hard drives? I just wanted to make sure

Cekit 8085 micro trainer

I picked up a Cekit 8085 microprocessor trainer last weekend, model MT-01. Google seems to be of no help - has anyone else here got one of these? There's nothing really specific that I wanted to know, but it's just odd that there seems to be no info out there at all about it. Some of the

Re: Ibm rs6000 7025-f50

On 07/31/2017 10:43 AM, Doc Shipley via cctalk wrote: ... I swear this is no exaggeration. To date, I have never located another person who was able to get AIX media through that educational program. So in summary, the experience was... umm, educational?

Model M case screws

Can anyone tell me the size of the Model M keyboard case screws? The one I use on my main 'modern' PC could use a good clean, but the case recesses are a little too narrow for a typical socket to fit - I either need a nut driver, or to shave a little material off the outside of a socket to

Re: Model M case screws

On 07/02/2017 01:03 AM, Chuck Guzis via cctalk wrote: On 07/01/2017 10:27 PM, Tony Duell via cctalk wrote: I was told years ago that in general the thinner-wall sockets are better quality -- they have to be made from stronger steel alloy to work at all. Obviously there are exceptions It

Re: Model M case screws

On 07/01/2017 02:12 PM, Adam Sampson via cctalk wrote: Jules Richardson via cctalk <cctalk@classiccmp.org> writes: Google suggests that they might be 7/32", but I'm not sure; that's less of a common size (vs. 3/16" or 1/4", say) - I'm not even sure I could find a driver

HP 1331A X-Y display blanking

Has anyone got a manual for an HP 1331A X-Y display? It's a storage-tube device, and I'm curious to know if there's a way of triggering the erase function remotely rather than having to physically prod the erase button on the front. The rear just has X-Y-Z inputs, and I *think* that X-Y are

Re: HP 1331A X-Y display blanking

On 04/29/2017 10:31 AM, Pete Lancashire wrote: I don't but. If there is not a connector on the back, you will need to route the signal to one. Find the erase button and look at the voltages. The "erase" signal will either be grounded to function or will be raise to a voltage level +5 or +12 for

Re: Cambridge Workstation woes - VMS 2691 PSU smoke

On 07/30/2017 11:28 AM, Tony Duell wrote: On Sun, Jul 30, 2017 at 5:18 PM, Jules Richardson via cctalk <cctalk@classiccmp.org> wrote: On 07/30/2017 10:59 AM, Ian Frost via cctalk wrote: Any body any experience in fixing these old Acorn PSUs - or managed to source alternative modern su

Re: The origin of SCSI [WAS:RE: The origin of the phrases ATA and IDE ]

On 10/05/2017 01:50 PM, Chuck Guzis via cctalk wrote: You could well be right--I do recall that there was "Mac SCSI" and then the slightly different "Everyone else's SCSI". I ran into this when talking with some SMS/OMTI engineers about an ST506-to-SCSI bridge board that I have. Their reaction

Re: Did DEC make a Daisy Wheel printer?

On 10/08/2017 12:27 PM, Adrian Graham via cctalk wrote: My brain is telling me LQP02 so yes, a daisywheel. I’ve not seen one for 30 years or so though. I think the last time I saw one would have been around 25 years ago, when I threw mine away :-( It took up too much space for the interest

Re: The origin of SCSI [WAS:RE: The origin of the phrases ATA and IDE ]

On 10/09/2017 12:52 PM, Chuck Guzis via cctalk wrote: On 10/09/2017 06:52 AM, Jules Richardson via cctalk wrote: My understanding there is that true SASI supports just a single target, and so there's no selection phase like there is with SCSI (and SCSI provides an extra signal on the connector

Re: The origin of SCSI [WAS:RE: The origin of the phrases ATA and IDE ]

On 10/09/2017 10:42 AM, Jon Elson wrote: On 10/09/2017 08:52 AM, Jules Richardson via cctalk wrote: My understanding there is that true SASI supports just a single target, and so there's no selection phase like there is with SCSI No, not true. Each of the 8 data lines selected one target, so

Re: formatting MFM drives on a IBM PC

On 09/26/2017 01:19 PM, Ethan via cctalk wrote: I don't know if it's a good idea to low level format a drive or not. I remember at least one manufacturer recommending it for their drive(s) if they were ever tilted through 90 degrees - presumably there were tiny effects on the head

Re: formatting MFM drives on a IBM PC

On 09/27/2017 09:59 AM, Ethan via cctalk wrote: The idea of IDE, as my understanding, is the controller that existed as an ISA card was moved onto the actual drive, and then what became the controller was mostly just extending the ISA bus over to the drive. I actually have an IDE "controller"

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

On 10/02/2017 01:46 AM, Alan Perry via cctech wrote: There was a call to form the CAM (Common Access Method) Committee of X3T9.2 (SCSI-2) on 30 Sept 1988 and they first met on 19 Oct 1988. The primary goal was to come up with a SCSI subset to facilitate it support in multiple OSs and BIOS on

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

On 10/02/2017 08:29 AM, allison via cctech wrote: On 10/2/17 8:22 AM, Jules Richardson via cctech wrote: On 10/02/2017 01:46 AM, Alan Perry via cctech wrote: There was a call to form the CAM (Common Access Method) Committee of X3T9.2 (SCSI-2) on 30 Sept 1988 and they first met on 19 Oct

Re: formatting MFM drives on a IBM PC

On 09/29/2017 11:20 AM, Jon Elson via cctalk wrote: I can only imagine a real AT would be even less likely to handle a drive over about 40 MB. I think the limit was normally 512MB in the old c/h/s addressing days, wasn't it? For a connected drive, the BIOS set aside 4 bits for the number of

Re: Atari PSU with collapsing 5V rail

On 08/21/2017 10:06 AM, Chuck Guzis via cctalk wrote: Well, to throw some kerosene on the fire, this from Wikipedia: :-) "According to etymologist Jan Freeman, the story that duct tape was originally called duck tape is "quack etymology" that has spread "due to the reach of the Internet and

Re: Atari PSU with collapsing 5V rail

On 08/20/2017 01:57 PM, Mike Stein via cctalk wrote: Well, if we're going to nitpick it's _baling_ wire as in tying up bales of hay; bailing is for leaky boats. And if we're talking WWII, wasn't it duck tape? Duck cloth with an adhesive layer. "Duct tape" came later... I wonder if we're

Re: Fujitsu M2235S

On 10/21/2017 01:31 PM, Phil Blundell via cctalk wrote: Anybody familiar with the internals of these disks? I have one here which seems to have the positioner stuck at track zero. I'm not sure whether it's likely to be just a bit sticky and in need of some assistance or whether there is some

Re: Ideas for a simple, but somewhat extendable computer bus

On 11/17/2017 07:11 PM, Jim Brain via cctalk wrote: I looked at home computer busses (Atari, Apple, Commodore, Tandy, TI) for a bit of inspiration, but they all seem overly simplistic (not horrible, but hate to just punt on the idea). Is the multi-CPU stuff important initially? If not then

Re: NeXT hardware about to be recycled in Texas

On 12/05/2017 04:51 PM, jim stephens via cctalk wrote: I also saw it on the craigslist discussion on vcf, which got more attention. Also on one of the Facebook groups. I expect the owner is completely drowning in "give me your cool stuff!" messages by now and about ready to pitch the whole

Zenith Z-90 startup

Any Zenith Z-90 owners out there (which appears to be the same thing as a Z-89 / Heath H89, but with a DD soft-sectored disk controller)? I was given one up a couple of days ago which isn't giving the expected "H:" prompt at power-on - but it *does* give a blinking cursor, and hitting

Re: Zenith Z-90 startup

On 05/12/2018 02:29 PM, Mister PDP wrote: Hello, I have had this issue with a number of H/Z89s I have. The terminal board and the logic board are two separate systems, so it seems to be common for the logic board to go down while the terminal board keeps working. I would check voltages on the

Re: Old core memory system.

On 05/05/2018 04:57 AM, Mattis Lind via cctalk wrote: It could be flight control related since it is aviation museum that currently have it. Hmm, 'stack heater' caught my eye... I'm not particularly familiar with core setups, but I didn't think that was a common thing, suggesting the

Re: DEC FPJ11-AA

On 07/01/2018 03:00 AM, Paul Birkel via cctalk wrote: https://www.ebay.com/itm/DEC-PDP-11-84-M8190-AE-Module-FPJ11-AA/113112634277 IMO a really good deal on an 18 Mhz FPJ11-AA. Those don't seem to come up much . Hmm, untested and no returns... is that typical of sellers (and do buyers

Televideo 970

Hi All, I got a lovely Televideo 970 terminal from another list-member over the weekend. Aside from some PSU capacitor issues, it needs a little TLC: 1) The EMI filter had gone open-circuit - it's one of those metal can types which is integrated with the IEC power input connector. Are these

Re: Microvax II 'primer'?

On 01/21/2018 01:25 PM, Jules Richardson via cctalk wrote: So, I picked up (and I did just carry it into the house, and now I hurt) a Microvax II from another list member yesterday. OK, the top PSU of the pair in this machine appears to be healthy. The bottom one, however, sits at around

Re: DEC H7260 PSU fault

On 01/25/2018 07:16 PM, Glen Slick via cctalk wrote: On Thu, Jan 25, 2018 at 3:06 PM, Jules Richardson via cctalk OK, the top PSU of the pair in this machine appears to be healthy. The bottom one, however, sits at around 2.5V on both the +5V and +12V outputs. That's without any cards

DEC H7260 PSU fault

Hi all, I mentioned this in the thread where I'd asked about basic Microvax II info, but it may have got lost in traffic... The machine's H7260 PSU is somewhat unwell - one of the internal +5/12V supplies appears to be healthy, but the other has outputs which are sitting at around 2.5V

Re: DEC H7260 PSU fault

On 01/25/2018 09:29 PM, Jules Richardson via cctalk wrote: On 01/25/2018 07:16 PM, Glen Slick via cctalk wrote: On Thu, Jan 25, 2018 at 3:06 PM, Jules Richardson via cctalk OK, the top PSU of the pair in this machine appears to be healthy. The bottom one, however, sits at around 2.5V on both

Re: DEC H7260 PSU fault

On 01/27/2018 10:29 PM, allison via cctalk wrote: FYI all this is covered in the BA123/microVAC manuals. Seriously, if your not familiar with Qbus and microVAX boxes RTFM and as many as you can find. The 630QB tech manual seems to be pretty comprehensive, and I have digested that one now, I

Re: DEC H7260 PSU fault

On 01/27/2018 03:02 PM, Jules Richardson via cctalk wrote: OK, looking at the 630QB tech manual now, which seems to be where these were lifted from... and of course it points out that the LEDs on the M7606 correspond to the hex codes on the panel (i.e. my four red LEDs with the middle pair

Re: DEC H7260 PSU fault

On 01/27/2018 11:44 AM, Glen Slick via cctalk wrote: On Sat, Jan 27, 2018 at 9:04 AM, Jules Richardson via cctalk <cctalk@classiccmp.org> wrote: Time to add CPU/memory in, wire up a console cable and see what happens, I guess. With the PSU working everything else should be easier

Re: DEC H7260 PSU fault

On 01/27/2018 12:51 PM, Adrian Graham via cctalk wrote: Anyway, I tweaked my loads to draw a little more current - and bingo! I'm now getting stable +5V and +12V outputs on both PSUs, a working card cage fan, and the DC OK light comes on. This is good, particularly since my own BA123 has been

Re: DEC H7260 PSU fault

On 01/26/2018 07:15 PM, Jules Richardson via cctalk wrote: After that... well, I need to work out how to get the entire supply assembly to start up while it's open, so that I can work on it outside the machine - then I can at least start looking for differences between the two supplies (boy

Re: DEC H7260 PSU fault

On 01/27/2018 04:02 PM, Ethan Dicks wrote: On Sat, Jan 27, 2018 at 4:34 PM, Jules Richardson via cctalk <cctalk@classiccmp.org> wrote: Success! Congratulations! ish... :-) It seems that my DHV11 board is bad - the system stalls on the PSU tests with it plugged in. The TK50 driv

Re: Password reset for ~1998 AIX on RS/6000?

On 02/01/2018 02:28 PM, Tapley, Mark via cctech wrote: Is there a standard procedure for recovering lost passwords for these systems, or for resetting passwords? I do have physical access to the machine; it’s possible I can find an AIX install disk but it’s *highly* desirable to preserve the

Re: Unknown Z80 CPU board and backplane ID anyone?

On 07/30/2018 12:27 PM, Adrian Graham via cctalk wrote: Hi folks, A friend of mine in the UK is looking for any info on the following boards. The CPU board is marked ‘VA 03-907023-00’ and features a Z80 with 16K RAM and an 18.432MHz crystal. The backplane is also VA and has 11 132-pin slots

Re: Fairly Extensive Singer/Friden "System Ten" Computer System for Rescue

On 08/18/2018 01:24 PM, Jason T via cctalk wrote: I did finally make contact with the system owner. The case isn't quite as urgent as originally depicted - we have a couple months to work on the rescue. I'm in touch with a museum that has the resources to transport and care for it. Hoping

Re: Fairly Extensive Singer/Friden "System Ten" Computer System for Rescue

On 08/08/2018 09:13 PM, Rick Bensene via cctalk wrote: Through my Old Calculator Museum website, I have been contacted by a gentleman that has a fairly substantial Singer/Friden System 10 that is located in a building that the business wants to clear out. All, Any update on this - has anyone

MOS MCS2529 math chip

Anyone got pinout/spec information for a MOS MCS2529? In particular, I'm curious about operating voltage. I acquired a Melcor SC-635 calculator yesterday and there seems to be some uncertainty about the output voltage of its (rechargeable) battery pack; some places say 2.4V, i.e. the pack is

Re: MOS MCS2529 math chip

On 07/20/2018 10:57 PM, Tony Duell wrote: It is not uncommon for the NiCd cells to act as a shunt regulator in such calculators. The charger is of relatively high voltage (say around 9V), it is applied to the cells through a current limiter (often just a simple resistor as you say), and the fact

Re: MOS MCS2529 math chip

On 07/22/2018 02:35 PM, Paul Berger via cctalk wrote: These calculators all have 3 NiCd cells in them if the batteries where already removed, you may get a clue from the shell how many cells it was designed for. Oh, fun... so, I'd found this snippet of info online the other day: <<< I have

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

On 07/21/2018 10:14 AM, Carlo Pisani via cctalk wrote: hi yesterday I was shocked by a couple of videos on Youtube where guys pointed out their negative experiences with CD ROM and DVD RAM as media for their own backup. They complained their data completely lost after 5 years of storage in CD

Re: Microvax II 'primer'?

On 01/22/2018 08:07 AM, Adrian Graham via cctalk wrote: At this stage I've got no idea if it's a SMPSU or a linear (I've not popped the panel off)... I suppose if it's linear then it perhaps doesn't even need a load to do its thing. If it's a switcher then I expect it'll at least need something

Re: Microvax II 'primer'?

On 01/22/2018 02:05 PM, allison via cctech wrote: On 1/22/18 2:18 PM, Douglas Taylor via cctech wrote: I can't believe you 'just carry it into the house' all by yourself, unless you are professional athlete. I also have a MicroVax II in the BA123 world box and it has wheels for a reason! The

Re: SCSI Controller Hanging...

On 01/23/2018 10:33 AM, Jack Harper via cctalk wrote: Greetings to the List from the Snowy Rocky Mountains. Beautiful clear sunny day here at +9F :) It's a toasty 20F here in northern MN :) I have never before dealt with SCSI as a programmer - does this sound like something is configured

Re: Televideo 970

On 01/23/2018 09:54 AM, Aaron Jackson wrote: 1) The EMI filter had gone open-circuit - it's one of those metal can types which is integrated with the IEC power input connector. Are these still obtainable anywhere? It seems like equipment these days just has the filtering directly on the PSU

Microvax II 'primer'?

So, I picked up (and I did just carry it into the house, and now I hurt) a Microvax II from another list member yesterday. Cosmetically it's a disaster (BA123 has a cracked top panel, broken wheels, missing front door, missing right-rear panel) but internally it appears to be complete; board

Re: Microvax II 'primer'?

On 01/21/2018 04:04 PM, Rob Jarratt wrote: You might find that the filter capacitor goes up in smoke soon after you connect the PSU to the mains, even without powering it on. Yes, Adrian Graham mentioned that (via FB), too. I seem to have extremely good luck with the RF filter caps, unlike

Re: Cray Origin 2000 From Indiana University Scaamp Project- Rescued

On 03/09/2018 06:58 PM, PhreakShow Telephone Company via cctalk wrote: I won an auction down at Indiana University for an SGI Origin 2000 System and 19 racks. Aha, we were just discussing these on the Facebook vintage group... are those two populated racks and 17 empty ones, or is there more

Re: Apple B CRT monitor popping and clicking

On 04/03/2018 08:08 PM, Toby Thain via cctalk wrote: They are colour. In this context, B means "blue and white", as in the G3 tower (and monitor) colour scheme. Pinstripy if I recall correctly. I never thought I'd see B in the context of displays mean anything other than black & white, but of

Re: Kaypro II keyboard fault / keyswitches wanted

On 04/18/2018 06:01 PM, Jules Richardson via cctalk wrote: However, the keyboard appears unresponsive. Pressing keys (with the exception of caps-lock, the two shifts, and ctrl) results in a buzz/click from within the keyboard - if I'm interpreting the schematics right, the click is actually

Re: FTGH: Unknown extender card

On 03/03/2018 04:48 PM, Noel Chiappa via cctalk wrote: Hi, I'm not sure what kind of system this extender card I suppose there's a chance that it's for a piece of test equipment or something more analog in nature, and not computer at all - all sorts of equipment in the '60s had a

Re: ISA sound and video cards, and PCI? AGP?

On 11/8/18 12:48 PM, Electronics Plus via cctalk wrote: The problem with trying to get these any cheaper is that the gold value, by the pound, exceeds what I think an untested card should go for. They want to charge me $7-10 PER CARD, and that is untested. Then I have to pay shipping, and labor

CPT boards

I borrowed a pile of scrap 1970s-era PCBs from my local recycler yesterday, just to make sure there was nothing important among them before they go off for processing. Among them are six boards branded as CPT, which I assume (as I'm in MN) is the CPT Corporation that was in Minneapolis.

Re: CPT boards

On 10/06/2018 01:40 PM, Al Kossow via cctalk wrote: could be part of a 4200 or a VM http://www.ricomputermuseum.org/Home/small-systems-at-ricm/cpt-4200-series-typewriter since the date codes are early, i'd guess the 4200 Possibly, although there are quite a few ICs with 1976 and 1977 date

Re: Digico computer

On 10/06/2018 03:46 AM, Christian Corti via cctalk wrote: On Fri, 5 Oct 2018, it was written I worked with DIGICO?s in 1974. Is it red? Does it have a manual pull through paper tape reader? Was it made in the UK? I am most interested Yes, it is red and has a small reader on the front plate.

Re: CPT boards

On 10/06/2018 06:42 PM, Adrian Graham via cctalk wrote: I’ve talked to a few CPT employees over the years, see http://binarydinosaurs.co.uk/museum/cpt/ - if your haul is related to the 4200 I’ll need to add the pics too :) Sure thing! I've set the

Re: Osborne-1 with prototype-based motherboard

On 12/29/18 2:53 PM, Brad H via cctalk wrote: Am just posting this as I am hoping someone out there knows someone who was involved with Osborne back in the day to find out more this Osborne 1 motherboard I found in a low serial O1 I picked up for $100. Is it just the board layout that's

Re: Osborne-1 with prototype-based motherboard

On 12/29/18 6:59 PM, Brad H via cctalk wrote: And then other boards used a 3A-xx number instead of the 2A2001 number. Kind of confusing. For what it's worth, looking at a photo, my[1] machine's board looks more like "3P10083 REV A" down by the front edge of the board, unless there's some

Re: RS/6000 7043-140 boot floppies

On 2/18/19 11:49 AM, Alan Perry via cctech wrote: The system does boot the AIX install on one of its hard disks, but this is a recycled system and I don't have usernames/passwords for that install. Does anyone here have a suggestion on how to proceed? If you've got another Unix-a-like (e.g.

"industrial" PDP-11

Hey all, I bumped into someone who has some early (mid 1970 on some of the photos I've seen) PDP-11 bits - front panel and a handful of boards (the backplane, PSU, rack, peripherals etc. are long gone). The front panel's branded as "Industrial 11" though, which isn't something I've seen or

Re: "industrial" PDP-11

On 5/15/19 6:25 PM, Jules Richardson via cctalk wrote: Hey all, I bumped into someone who has some early (mid 1970 on some of the photos I've seen) PDP-11 bits - front panel and a handful of boards (the backplane, PSU, rack, peripherals etc. are long gone). Ugh, update... apparently

Re: "industrial" PDP-11

On 5/15/19 9:29 PM, Steve Malikoff via cctalk wrote: Here's the Industrial 11 version of the 11/05: https://youtu.be/XV-7J5y1TQc?t=254 Thanks for finding that... yup, that appears to be the exact panel that he has (and /5 or /10, or in fact what the difference is between the two anyway, I'm

Decaying foam on PCBs

I picked up a couple of HP 5036A logic trainers today, both of which have had goopy decaying foam come into contact on their PCBs. What's effective at removing it? I've only ever had problems with it in locations where I can use things such as citrus-based cleaners, but I'm a bit wary of

Re: Decaying foam on PCBs

On 8/27/19 10:38 PM, Chuck Guzis via cctalk wrote: I'd probably just use 91% isopropanol. No water to speak of, doesn't bother plastics--and cheap. I do normally use it on boards for general cleaning - I was just assuming that this nasty sticky foam would be too much for it. I'll give it a

Heath/Zenith Z100 technical...

I just picked up a board set from a Zenith Z-100 (not sure if it was a 110 or 120 model) which had been junked. I threw this out on the sebhc mailing list too, but perhaps someone here knows: a) If the machine's keyboard is completely passive (i.e. just a bunch of switches), or if there's

Re: Heath/Zenith Z100 technical...

On 9/11/19 3:51 PM, Al Kossow via cctalk wrote: I'll put up a few things on bitsavers under zenith Thanks, Al! I've got the bitmap board, plus S100 cards for floppy, Winchester, and an extra 256K of RAM (it has 256 on the mainboard, by the looks of it) - so if I can work out the keyboard

Re: IBM 5160 with oddball MDA input/output card

On 7/26/19 11:25 AM, Liam Proven via cctalk wrote: On Fri, 26 Jul 2019 at 13:23, Jules Richardson via cctalk wrote: Someone on one of the Facebook vintage groups Oh? Which one? It's in Vintage Computer Club, posted on the 24th. Doubtless Facebook's buried it for you because it seems

IBM 5160 with oddball MDA input/output card

Hi all, Someone on one of the Facebook vintage groups found an IBM 5160 with an MDA display for sale in Australia, except that it's a bit odd in that the machine had what appears to be an MDA card, the output of which is then connected via a short external cable to the input on another

Re: IBM 5160 with oddball MDA input/output card

On 7/26/19 9:50 AM, Tony Duell wrote: Are you sure it's MDA rather than CGA. The reason I ask is that I have a full-length 8-bit ISA card in my collection that connects between the CGA card and its monitor (it also provides a composite video output if you want that) _and_ inside the machine it

Re: IBM 5160 with oddball MDA input/output card

On 7/26/19 2:53 PM, Fred Cisin wrote: Genlock? MOST video add-ons were combined onto a board with their own video card, rather than connecting to IBM's It seems odd within a 5151/MDA context though - plus the system seems entirely self-contained, i.e. not designed to interact with any other

Re: Vintage Computer Warehouse Liquidation

On 9/22/19 2:40 PM, Thomas Raguso via cctalk wrote: This is my first of many posts that I will make about this sale. Is there any connection to Computer Reset in Dallas, or is this a completely different animal?

Re: TI994/A Power Supply

On 11/4/19 7:39 AM, Allison Parent via cctalk wrote: Do better research. The power is external transformer and internal low voltage switch mode power supply. It seems to depend on the variant. I've got a /4 and a /4A which have 4-pin plugs on the back, and these use an external PSU outputting

Re: VAX & PDP-11 Stuff To Clean Out

On 11/6/19 12:16 PM, David Coolbear via cctech wrote: M5976-AA KZQSA SCSI Controller Q Hmm, I could sure use one of those... I bought a bunch of QBus boards from my recycler quite some time ago, but the systems that they'd been pulled from were run with SMD drives. Finding a working SMD

Re: TI994/A Power Supply

On 11/11/19 1:12 AM, Eric Smith via cctalk wrote: On Sat, Nov 9, 2019 at 1:46 PM Jules Richardson via cctalk < cctalk@classiccmp.org> wrote: I've got another /4A however which has a 2-pin plug on the back, and that one appears to just take plain ol' 110VAC line voltage and t

Re: TI994/A Power Supply

On 11/14/19 3:02 PM, Jules Richardson via cctalk wrote: I'm about 95% certain that it does NOT take line voltage in. Hmm, I'll see if I can find a moment to take it apart later. It's interesting that it's a boxed unit with a cord that fits - but then it does have three broken keys (caps

HP 7220C plotter port settings

Hi all, I picked up an HP 7220C flatbed plotter the other day which (after freeing the stuck carriage) is responding to panel commands in 'local' mode. For the terminal RS-232 interface, does anyone happen to know: a) The character size (7 or 8 bits)? b) If the connection between terminal

Re: HP 7220C plotter port settings

On 12/5/19 6:13 PM, Glen Slick wrote: 7220C_7220T_OperatingAndProgrammingManual_07220-90003_229pages_Feb81.pdf http://www.hpmuseum.net/document.php?hwfile=1567 doh! Thanks. I'd been to that site already, but somehow managed to completely miss the 'documentation' link. That should do the

Re: Can't contact Dave McGuire AK4HZ

On 10/26/19 10:19 AM, Jon Elson via cctalk wrote: Dave McQuire keeps emailing me about the CAMAC controller boards, but he obviously is not getting my replies. Anybody know how to contact him? FYI I just threw him a message on facebook letting him know, although it's not saying that he's

CRT faceplates / screen "mold"

Many years ago I cut the faceplate off an HP display exhibiting serious decay of the sealant between the faceplate and the CRT itself, cleaned everything up, then reattached the plate just with a bead of sealant around the perimeter (where it wouldn't be seen once the bezel was back on).

Re: Vintage Computer Warehouse Liquidation

On 9/24/19 7:02 AM, Electronics Plus wrote: Computer Reset was in Dallas. This one is in Houston. Totally different animal. Thanks for the clarification - they're not too far, and this guy posted photos of a few items on Facebook which appeared to have been taken in a small garage - so there

Re: Vintage computer store hints in Minneapolis?

On 9/23/19 10:22 AM, JP Hindin via cctalk wrote: I also rolled through The Ax-Man... for 3 hours because I'd never even heard of the place before and was absolutely astonished at what I'd found. Despite getting to Minneapolis a few times a year, I've never been for exactly that reason - my

Re: Mystery 1970 core board

On 3/3/20 9:32 PM, Brent Hilpert via cctalk wrote: It looks to be 16 bits wide rather than 8, I think you'll find there's another 8 bit-arrays of cores on the underside of the planar-array daughter board. You may well be right; I can't quite tell for sure as there's not much clearance between

Re: Mystery 1970 core board

On 3/3/20 6:18 PM, Jules Richardson via cctalk wrote: Hopefully collective wisdom can help on this one - does anyone have a clue what system this core board was from I think I may have figured it out. Back when I picked these up (I have another one, too) they were in a pile of boards from

Mystery 1970 core board

Hopefully collective wisdom can help on this one - does anyone have a clue what system this core board was from: http://www.classiccmp.org/acornia/tmp/coresmall.jpg The curved edge connectors (presumably to make board insertion easier) are quite distinctive, plus the way the power's fed

Re: Mystery 1970 core board

On 3/4/20 1:15 PM, Al Kossow via cctalk wrote: found it in this MAC-16 ad https://adspast.com/store/customer/product.php?productid=62927 Thanks, Al! Definitely it. Hopefully I'll make it back to the site at some point and see if there are more related boards, although I think everything

Mystery mid-70's keyboards

Hey all, I was wondering if anyone knows what system either of these two keyboards came from: 1) APL keyboard made by Maxi-switch, IC date codes in 1976, p/n 2129-009, keyboard encoder has "NKBD-452 03-004-05": http://www.classiccmp.org/acornia/tmp/maxi.jpg 2) Keyboard branded as Licon

Lockheed MAC-16

Are there any surviving Lockheed MAC-16 machines anywhere? And/or does anyone have a good photo of the front? (All I've been able to find online is the angled shot that's on the wikipedia page, plus a few grainy images from marketing info). I rescued a couple of panels a little while ago,

Re: Mystery mid-70's keyboards

On 12/28/19 12:06 PM, Warner Losh via cctalk wrote: "marg set" sounds like a word processor. Looks like a data entry keyboard... Yup, the ASCII control codes on the keys seemed out of place for a wordprocessor, but then there's that "marg set" key. I'd wondered about some kind of early

Re: Core Memory Photo

On 4/15/20 6:22 PM, keith--- via cctalk wrote: I have three others with the cover still on :)  I want to make a clear plexiglass cover for them. Just for fun, this is what I have from a Lockheed MAC-16 machine: http://www.classiccmp.org/acornia/tmp/catcore.jpg ... the white line is a cat

Re: Bob Davis and old computer stuff

On 4/26/20 6:45 AM, Tony Duell via cctalk wrote: You're making me feel very greedy, as I have 4 of them. All different, and none for sale... :-) I've been looking for one ever since I moved to the US 12 years ago, but they seem to have all vanished - I remember I'd see them surface every

  1   2   >