test-drb

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101090 discussions

by db＠db.net

I just stumbled over this page this morning. Wow. Fascinating story! http://ferut.ca/my-story/ -- - db at FreeBSD.org db at db.net http://www.db.net/~db

8 years, 6 months

LMI Lambda Lispmachine Keyboard aka Space Cadet Keyboad

by mcwood＠nefkom.net

Hello, I have the keyboard for a LMI Lambda Lispmachine but I'm missing the computer itself. Is there a simulator or similar available? The keyboard is similar like here http://world.std.com/~jdostale/kbd/SpaceCadet.html. On the left side there is lable with "LMI" and a sticker "Scientific Computers Limited". Here is a picture showing the actual layout: http://www.covingtoninnovations.com/michael/blog/1402/140208-keyboard.jpg Best Regards, Marc

8 years, 6 months

Bendix G-15 [was: Re: VCF PNW 2018: Pictures!]

by jnc＠mercury.lcs.mit.edu

> From: Al Kossow >> On 2/18/18 12:20 PM, Brent Hilpert via cctalk wrote: >> ... his 709 went to the CHM. Anything else of the big stuff? > the 7094 and 650 A 7094? Neat! Very historic machine. I wonder if it would be possible to fabricate the extras needed to run CTSS on it... :-) Noel

8 years, 6 months

Control Data 841 disk drive's 3-phase power supply resurrection

by p.gebhardt＠ymail.com

Hello list, currently, I am in the process of trying to bring back to life a disk drive installation from Control Data known as "841 Multiple Disk Drive" ( MDD ). From the early '70s. It uses hydraulic disk head actuators! Pictures of the subsystem are here: http://www.digitalheritage.de/peripherals/cdc/841/841.htm I started with the power supply. Most of the electrolytic capacitors need to be reformed which is being done.? As far as I know, some computer installations used 400Hz 3-phase back in the days. Does anybody know, if that is the case for this type of drive systems? I couldn't find any indication so far, except for the input filter that supports up to 400Hz (written on it). I've quite some experience with old linear power supplies, but never worked with three-phase supplies, yet. Has anybody experience with this? Anything particular to be considered? There is an operator's manual, but there don't seem to be manuals or schematics about this type of CDC drive nor on bitsavers, neither elsewhere on the net. How could help me in pointing out where to get these? A lot of questions, I know.... :) Thanks a lot for any of your precious help, Pierre ------------------------------------------------------------------------------- Pierre's collection of classic computers moved to: http://www.digitalheritage.de

8 years, 6 months

PDP-8 name plate artwork

by cramcram＠gmail.com

The VCF picture album just posted has a shot of a PDP-8e system that looks like mine. Except that all 3 of my rack toppers are southwestern red/orange with no logo as opposed to the one on the right with the DEC, PDP-8e printing. Does anyone have a scan/stencil/etc. of that panel available? Thanks, Marc

8 years, 6 months

Restoring a VT50 (VT52 actually) .

by fritzm＠fritzm.org

On 12/26/2017 5:25 AM, Mattis Lind via cctalk wrote: > Since the terminal appears to work I also dumped the firmware out of the four bipolar PROMs. > > http://storage.datormuseum.se/u/96935524/Datormusuem/VT52/124A9.HEX > http://storage.datormuseum.se/u/96935524/Datormusuem/VT52/125A9.HEX > http://storage.datormuseum.se/u/96935524/Datormusuem/VT52/126A9.HEX > http://storage.datormuseum.se/u/96935524/Datormusuem/VT52/127A9.HEX > > @Fritz: You don't need to get a dump of the PROMs in your terminal. I think the ones I have is in pretty good shape. Well, I finally got some time to play in the basement again this weekend, so I thought I'd have a go a freshening the PROM sockets on my VT52 to see if that makes it less flaky. Pulled the PROMs and gave them a read on my DATA I/O. The four I have are indeed bit-identical to the dumps posted by Mattis above, so I thought I'd note that here for completeness. cheers, --FritzM.

8 years, 6 months

Looking for info on some Olympia CP/M machines - ETX I, ETX II & EX 100

by robert626001＠gmail.com

This week, I scored four Olympia boxes - an ETX I, an ETX II and two EX 100s. Googling has not been very fruitful. I have established that the ETX II and the EX 100 are CP/M machines, SSDD 48 tpi 5.25" and DSDD 48 tpi 5.25" respectively and have seen one assertion that the ETX II is S-100 based - I won't be able to confirm that until I open it up. I found nothing on the ETX I. It doesn't seem to have a floppy drive, so may not be a CP/M box. I guess I'll have to power it on and see if it gives me a clue as to what's in the firmware. As best I can figure out, these were sold as add ons for electric typewriters. You hooked them up, with they typewriter acting as keyboard and printer and you had a word processor or computer. I think I have one interface board, that came in a box with the EX I. Does anybody know anything about these machines? It seems like a boot disk from an Osborne One would work. Most immediately, though, does anybody know which typewriters they worked with? I have an opportunity to go back to where I got them, today and it would be great if I didn't have to haul off every damn typewriter with "Olympia" on it! Thanks -- Robert

8 years, 6 months

RX02 problem

by useddec＠gmail.com

Hi Bill, If you have tried new media and the problem is on both drives, I have the M7744 and M7745 boards for $75 each and will throw in the cable between them. Shipping is $10 within the US. Thanks, Paul

8 years, 6 months

DEC Tape drive, controller, formater parts

by useddec＠gmail.com

Here is list of DEC tape related parts. Please contact me off list if you have any questions or wish to make any offers. One, all, or anywhere in between. Located in IL Thanks, Paul 3- M8901 3- M8901YA 6- M8901-YB 2- M8901-YC M8901-YD 2- M8902 M8902-YA 2- M8904 M8904-YA 3- M8905 M8905-YB 4- M8906 3- M8907 6- M8908 3- M8908-YA M8912 M8922 M8923 3- M8924 2- M8929 M8931 2- M8933 2- M8937 M8940 3- M8950 M8951 2- M8953 M8955 M8957 M8958 M8960 M8962 M8966 M8967 54-12262 54-12264

8 years, 6 months

Vaxstation 3100 of odd sort on epay

by jwsmail＠jwsss.com

This might be a tempest or shielded vaxstation? Anyone speculate or know for sure. The vendor may have these mixed in as equivalent to their other vaxstations. If you search for "DEC vax VS42A-BN" you end up back at the vendors listing for the ones with plastic covers. I didn't turn up any info yet, not hoping to. but the thing has what appears to be optical, and a huge connector which may be shielded SCSI on the back. I can't tell from the front, but there may be a hatch to allow it to be opened and a floppy inserted, not sure from the photos. VINTAGE-RARE-DEC-DIGITAL-VAXSTATION-3100-PF-VS42A-AA-RF-VS42A-BN-COMPUTER-SYSTEM/ http://www.ebay.com/itm/370930391341 Kind of an interesting device. I looped back into the vendors listings to this auction for the plastic topped version, by the way VINTAGE-DEC-DIGITAL-VT1300-VAXSTATION-VS42A-BB-COMPUTER-SYSTEM-VT-1300-TERMINAL/ http://www.ebay.com/itm/370912245260 It is badged VT-1300 so may not be a vaxstation. And the other box may be one of the VT-1300's that is tempest or shielded. thanks Jim

8 years, 6 months

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