test-drb February 2012

test-drb@ccmp.vtda.org

158 participants
158 discussions

by mcguire＠neurotica.com

Can anyone here (preferably in the US) spare an RL01/02 unit select plug for unit "2"? I thought I had one but I can't find it. I can swap a "0" if desired. Thanks, -Dave -- Dave McGuire, AK4HZ New Kensington, PA

12 years, 10 months

Reverse-engineered source code for TRS-80 Model II/12/16 boot ROMs

by eric＠brouhaha.com

http://www.brouhaha.com/~eric/retrocomputing/radio_shack/trs80_model_ii/trs…

12 years, 10 months

If It Ain't Broke, Don't Fix It: Ancient Computers in Use Today

by stephane.tsacas＠gmail.com

A nice and illustrated article : http://www.pcworld.com/article/249951/if_it_aint_broke_dont_fix_it_ancient_… -- Stephane FreeDonne <http://www.freedonne.org> Join FreeDonne - Rejoignez FreeDonne.

12 years, 10 months

Commodore 1581 repair conclusion

by jonas＠otter.se

>> > properly again! I believe this is the first time I've run into a >> faulty >> > CPU in a vintage computer (or peripheral). >> >> Wow, that's bizarre. 6502s don't fail very often. > > I can't remember if I'ev ever had to replace a 6502, but I've > certainly > had other CPUs fail. Z80, 8085, 6800, 8035 (fortunately ROMless), > some > 6803-seires microcontrolelr (again ROMless), and so on. > > My expeirence, as I've said beore is that while LSI ICs (including > microprocessors) are more reliable than the same circuit built from > TTL or > discretes, the LSI chips are less reliable than idividualt TTL ICs. > > -tony I once had an 8088 that behaved very strangely, it read the correct opcodes from memory but executed something completely different sometines. It turned out that the voltage between the +5V pin and the 0V pin was something like 4.65V. 0.1V too low a voltage was enough to make it execute some code correctly and other code completely wrong. Since then I always check the voltage at the chip's pins if strange things are happening. /Jonas

12 years, 10 months

Seattle Retro-Computing Society meets Saturday Feb. 25th

by searetcompsoc＠gmail.com

Come one, come all, to the Seattle Retro-Computing Society's regular monthly meeting! It will be held Saturday, February 25th from 11:30 AM to 5:00 PM (please note our new, later starting time). Do you do any of the following with old computers? Will you be near Seattle on Saturday? + Use, collect, and/or restore them + Play games on them + Write programs for them + Develop new hardware for them + Help other people do any of the above If your answer was "yes," then the SRCS is for you! We exist so you can show off your awesome stuff, bounce ideas off of fellow enthusiasts, and be inspired by one another's achievements, plans and aspirations. No idea is too big or too small, and we're not picky about what flavor of vintage machine you prefer! Come on down and tell us about it! The meetings are graciously hosted by the Living Computer Museum, which is gradually fitting out a computer museum in Seattle's SODO neighborhood. There will be refreshments, a Buy-Sell-Free-Trade table, and enough table space & power to set up anything you may want to show off! For further details, please see our web page at http://www.seattleretrocomputing.com/ and our mailing list at http://groups.google.com/group/seattle-retrocomp . Hope to see you there! Gordon "gsteemso" Steemson SRCS agitator-in-chief -- The Seattle Retro-Computing Society http://www.seattleretrocomputing.com/

12 years, 10 months

Sun GDM-20D10 monitors

by ama＠ugr.es

Hello everybody: A while ago I got two Sun GDM-20D10 monitors in very good condition. Both were working find, very clean, and they had been very well kept. I was using one of them with my Ultra 1 workstation and I was very happy with it. The other one I kept in storage (well preserved) to be put in use when I moved to a larger office and had enough space for it. Unfortunately, before that happened, I had to move temporarily to a smaller place, where I was using a TFT screen on a PC instead of my beloved Ultra 1 with it great monitor. When I had the chance to start using the Ultra 1 again the GDM-20D10 screen I had been using didn't work. It won't even start when I switch it on. I then took the second one from storage and try it out and the same happened, it won't start and it won't show any video activity or anything. I really like those monitors and would love to get them working again. That's why I asking here, where I think I have the highest chances to get help with them. Are there maybe any known problems with those monitors when they are off for sometime? I'm wondering because both of them were working fine and then none work anymore. I'm hopping there is something stupid I can easily fixed when I know about it and I can use them again soon. Any ideas, please? Thank you and regards. ?ngel -- Angel Martin Alganza Departamento de Genetica, Universidad de Granada Full contact data at http://www.ugr.es/~ama/ PGP Public key at http://www.ugr.es/~ama/ama-pgp-key ------------------------------------------------------ () ASCII Ribbon Campaign - http://www.asciiribbon.org/ /\ Against all HTML e-mail and proprietary attachments Please avoid sending me Word or PowerPoint attachments http://linux.sgms-centre.com/advocacy/no-ms-office.php

12 years, 10 months

VAX for running old version of VMS

by bqt＠softjar.se

On 2012-02-20 22:23, Holm Tiffe<holm at freibergnet.de> wrote: > Johnny Billquist wrote: > >> > By the way, yes, there is plenty of SCSI support in VMS. All of the more >> > modern VAXstations and whatnot have only native SCSI, and no MSCP or >> > similar. >> > >> > Johnny >> > >> > -- > Jonny I have had a very similar problem on my experimental KA630 uVAXII > with the Emulex UC07/08 Controllers. I've tried to connect some IBM 4GB > Disk since they where quiet. That hasn't worked at all. The Emulex > Firmware was happy, but neighter the RT11 (with an 11/53 CPU) nor the > VAX could access the two logical disks I've created on that drive. > Must have something todo with the emulex firmware that I have on that > controller. Way too hard to figure out what the problem is with this information. Have you checked that the CSR really is correct, for instance? If the controller firmware itself sees the disks just fine, then the connection between the controller and the OS is one obvious point to look at. But there could be a bunch of issues. Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol

12 years, 10 months

Lisa 1s at University of Michigan

by wayne.smith＠charter.net

Cool photo of a room full of Lisa 1s at the University of Michigan - taken March 4, 1984. http://tinyurl.com/6stp4hf

12 years, 10 months

Wanted: Commodore CBM disk drive cable

by dan＠decodesystems.com

Hello, First, thanks to Jay West et al for bringing the list back to life. I'm looking for a source for the data cable that connects a Commodore PET, CBM 8032 to a Commodore 4040 dual disk drive. The cable has an IEEE-488 connector on one end and a female PCB connector on the other. Any leads would be appreciated. Thanks! Cheers, Dan dan at decodesystems.com

12 years, 10 months

Starting a PDP 11/03

by jfoust＠threedee.com

At 07:48 PM 2/21/2012, Rich Alderson wrote: >At the time that the WD Pascal MicroEngine came out, I was informed >(by someone who would have known) that *it* was a re-use of the LSI-11 >chip set using new microcode. That was 30+ years ago, so I have no >way to back it up now, but I'm going to challenge you to provide the >evidence that WD came first. Wikipedia agrees, and so do I. <http://en.wikipedia.org/wiki/MCP-1600>http://en.wikipedia.org/wiki/MCP-1600 - John

12 years, 10 months

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test-drb February 2012