July 2022 - cctalk - classiccmp.org

by Dennis Boone

Folks, I've belatedly realized that it's going to be a bit of a headache to implement the old cctalk/cctech crossposting duality under the new version of mailman. I seem to recall a discussion about retiring the cctech list and just continuing with cctalk, and that the consensus was in favor of that. I'll call this message a consent agenda indicating that I plan to do that, unless there's loud outcry. De

3 years, 1 month

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Re: cctalk Digest, Vol 94, Issue 22

by manna5＠safe-mail.net

Dziękuję za twoją wiadomość. Przepraszam, jestem na wczasach i odpowiem później.

3 years, 1 month

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Re: cctalk Digest, Vol 94, Issue 21

by manna5＠safe-mail.net

Dziękuję za twoją wiadomość. Przepraszam, jestem na wczasach i odpowiem później.

3 years, 1 month

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Re: cctalk Digest, Vol 94, Issue 20

by manna5＠safe-mail.net

Dziękuję za twoją wiadomość. Przepraszam, jestem na wczasach i odpowiem później.

3 years, 1 month

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Information on Trend UTR 700 Paper Tape Reader and Facit 4060 Punch

by Martin Bishop

Google turns up very little specific information on either of these devices, e.g. nil return from bit savers. The best leads I have are: - The UTR 700 was badge engineered by Ferranti into FM1600B systems, one of which fetched up at the Centre for Computer History, Cambridge, England; perhaps with documentation. Also, as it was used in government systems some maintenance documentation may have fetched up in the PRO, at Kew. - Some Facit 4060 documentation, for the 4060, its 4061 & 4063 chums and the 5106 interface, look to be lodged in Box 52 of the ICL Collection at the Science Museum Library. The UTR 700 reader looks to be parallel interfaced, 10 single ended outputs from an interface card. The jokes start with manufacturer codes, rather than OEM part numbers on the 14 pin DIL ICs. However, a little scope work should identify tape out, data 0..7 and strobe lines. More interesting questions are lubrication and capacitor replacement - where a schematic would be a great assistance in deciding how to proceed. etc etc The Facit 4060 punch contains no more than the electro-mechanical mechanism : AC drive motor, solenoids and rotary position sensors. The 4070 documentation (on BitSavers) may read across, in terms of sensor characteristics, solenoid operating voltages and snubbing needs, or it may not. That reconstructing the schematic would be straightforward simply identifies how much is missing, and the difficulty of specifying it in the abscence of documentation. A classic tape punch interface from data latch and ready, through position sensing, solenoid drivers and done logic is required, together with auxiliary indications, e.g. tape out. etc etc Any information, wisdom, documentation or pointers to sources would be very much appreciated. To state the obvious, I was passed these devices by Philip Belben Martin

3 years, 1 month

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tape drives, oscilloscopes, and test equiment in Austin, TX

by Mark Linimon

Closing this Friday the 15th (sorry for noticing this late). At the University of Texas in downtown Austin. I have no association with the University, etc. https://swicoauctions.com/online/26/item/110345 https://swicoauctions.com/online/26/item/110400 https://swicoauctions.com/online/26/item/110404 There are a few other items that may be of interest. Note that these are all fine examples of the type of things I need *less* of :-) (including, of course, a Tek 564 that I have been lugging around for a few decades. Does anyone want to give it a good home? Fair warning: it's *heavy*.) mcl

3 years, 1 month

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Re: Retire cctech

by John Ames

I'm fine with that myself, but will list memberships from cctech be ported over, or will we have to re-register? I don't think I'm currently on cctalk.

3 years, 1 month

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Floppy Cables & "twists"

by Dave Dunfield

After recently selling my ImageDisk system, and having a few spare older PC mainboards - I decided to make another - I did find a board that seems to have a decent FDC - it does all single density formats (many don't). Alas, it is "slightly newer enough" to only implement one floppy drive on it's interface - floppy B: does not appear at all to the system. Ripping the cable off the front panel drive to connect an external one is somewhat painful - Since the PC normally has a twisted cable to swap Select1&Motor1 with Select2&Motor2 to put each set on Select2&Motor2 of different connectors, I thought I could just use a flat cable and add a switch near the PC end to switch Select1&Motor1 to go to either Select1&Motor1 -OR- Select2/Motor2 on both connectors with the internal drive set to 1: and a cable coming out the back for drives jumpered as 2: That way I could just "flip a switch" to choose between internal drive 1: or the external drive(s) 2: (either would appear as A: depending on the switch). But when I try to access a drive jumpered as 1:, it does select, but the motor doesn't turn on. This happens even without my "special" cable. If I connect the drive (by itself) on the PC side of the twist on a standard cable, the motor doesn't work. The twist swaps Select1&Motor1 to Select2&Motor2 on the farthest connector, and since a standard drive is jumpered as 2: - This should put the 1: signals to 2: for a drive in that position - all other wires are "straight through". It looks as if some other signals is expected to behave differently when the drive is jumpered as 1: (I've tried this with a couple of different drives) - anyone know whats going on? Dave (I can use the message archive to check for responses every few days, so replying here is OK). -- ---------------------------------------------------------------------------------- Search "Dave's Old Computers" see "my personal" at bottom!

3 years, 1 month

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Re: Kinetic Systems 2920-Z2B.

by Jon Elson

On 6/27/22 08:34, Mark Kahrs via cctalk wrote: > Anyone have one of these haunting their Q bus board pile? The LSSM would > deadly like one. Bad news. We had a big cleanup in our lab last year, and got rid of a LOT of stuff. I'm pretty sure we had a 2922, that was the CAMAC crate controller that may have been used with the 2920. Was the 2920 the Q-bus board that connected to a crate controller via a hand-made multicolor twisted pair ribbon cable? I think that went out a LONG time ago. I did have recently at home a KSC crate controller that had an LSI-11 inside it, but I think that went to recycling about 2 years ago. Sorry! Jon

3 years, 1 month

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RE: Xerox 800 Word Processor 1974 promo film

by D. Resor

In a search I found a digital brochure for the Xerox 800. The text is in Dutch. The text can be highlighted therefore I think it can be then sent to a translator. https://classic.technology/xerox-800/ Don Resor From: Eric Smith <spacewar(a)gmail.com> Sent: Monday, July 11, 2022 11:56 AM To: D. Resor <organlists1(a)sonic.net>; General Discussion: On-Topic and Off-Topic Posts <cctalk(a)classiccmp.org> Subject: Re: Xerox 800 Word Processor 1974 promo film Anyone know what's inside the Xerox 800? There seems to be little information online about any of the 800 series other than the 820. Based on the year of introduction of the 800, and allowing for time prior to that spent in development, I'm guessing that it's not microprocessor-based. (Whereas the 820 is.) Eric On Sat, Jul 2, 2022, 03:50 D. Resor via cctalk <cctalk(a)classiccmp.org <mailto:cctalk@classiccmp.org> > wrote: This video just popped up in my YT view. It was posted a couple days ago. At the end of the video, a recap of several Xerox computer products are shown. XEROX Word Processing Machines & Computers 1975 (Xerox 800 vintage promo film) https://youtu.be/Zkl80BAiaIw Computer History Archive Don Resor

3 years, 1 month

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cctalk July 2022