test-drb August 2014

test-drb@ccmp.vtda.org

213 participants
244 discussions

by jws＠jwsss.com

This is a set of spare laps for supposedly an aircraft setting. I think there are probably some in this pile that would be of interest. Aircraft-Spare-Light-Bulbs http://www.ebay.com/itm/13125905516 Also a bit pricy, but not if you need some of them. ($40 bucks starting) All appear to be incandescent. thanks jim

9 years, 11 months

VAX cluster for sale / rescue: Apple Valley, MN, USA

by jfoust＠threedee.com

Because of my "computer rescue" web page, I got a call from a fellow selling this VAX 4400/4300 cluster: http://minneapolis.craigslist.org/dak/sys/4595287377.html It sounds like it was running very recently until they carefully dismantled it for this decommissioning. They pulled the boards and put them in static bags, for instance. He seemed sincere about hoping it could find a good home, but he's also entertained offers from DEC resellers and scrappers. Contact me privately for more gossip about the ballpark. Time is of the essence; it sounds like he moved it into his residential garage and his wife would like it to disappear ASAP, so we're looking at days and not weeks before it needs to go. - John

9 years, 11 months

Wanted: non-working HP-85 main board for ICs

by marc.verdiell＠gmail.com

Asking here just in case. I need to find a replacement for a dead IC for my HP-85A. The IO buffer controller IC to be exact. Anyone has a dead HP-85A or just a motherboard that I could pick that IC from? I'd rather not "kill" a half working one. But I might have to. I am in Silicon Valley. - Marc

9 years, 11 months

Needing rescue: PDP-11 system in Regina, Sask. AND many other bits.

by toby＠telegraphics.com.au

H/t Hoff in #vms https://twitter.com/Fourmyle1953/status/495902788711641088 "3 racks inc. tape drive and controller for the RP03s , fault in the controller though." "If you know someone with a truck, could throw in a SOL , PET ( with drives ) Amiga 1000 , KIM ..." "Couple of Cromenco sys threes ... More but I'd have to dig a bit." "Regina Saskatchewan Canada. In the basement, so needs a few pall bearers. More parts north of Loon Lake. Some core memory etc." "If anyone wants any Commodore stuff I used to be the local warranty shop. Also have a few S100 machines." "Oh and also have a stock of NOS chips. 8080 sets 1k memory 2716 -> 27512 . Stuff like that .. Mostly work with Pics now." --Toby

9 years, 11 months

Floppy disk drive repair info?

by drlegendre＠gmail.com

Greetings folks, I've got a couple of dead C-1541 drives here, and not nearly enough knowledge / info to troubleshoot them. Does anyone have - or have a link to - a basic text on floppy disk troubleshooting & repair? For instance, I need to know what I should expect to see coming off the read head, and the read head pre- and post-amplifier circuits.. basic low-level info of that ilk. FYI I have 25+ years of exp. as an electronics tech, but almost exclusively in vacuum tube analog and audio circuitry. I have a scarce few basic solid-state & digital-specific instruments, such as logic probes / pulsers, transistor testers, transistor testers, not much more. Can you lend a hand?

9 years, 11 months

Teletype Interfacing Page / More TTY parts for sale

by billdeg＠buzz1.com

I created a web page for people new to teletype to 20mA computer interfacing. It's more about the hardware and how to get started than software and use. From there you have to learn how to make your computer interact, but this page is a good starting point: http://vintagecomputer.net/teletype101.cfm I started this page just before VCF East 7 and never finished it, now I can check this one off my list. BTW I still have some teletype parts for sale http://vintagecomputer.net/itemsavailable/2014/ Everything that has already been sold is marked SOLD and has already been shipped. Yes I am willing to sell parts. Directions how to order, where I am located, etc are on each for-sale page. Bill

9 years, 11 months

MAJOR OpenVMS News!

by healyzh＠aracnet.com

http://www.marketwatch.com/story/vms-software-inc-named-exclusive-developer… They're planning on porting it to x86! Zane

9 years, 11 months

DRAM memory for NorthStar Horizon

by ian＠platinum.net

Hello All, Does anyone have an old National Semiconductor memory data book lying around? I have found the problem with my second 32k memory board - 3 bad DRAM chips. This board is populated with MM5298N-3B chips. I can't find an online data sheet that talks about the speed grade (I'm assuming that's what the 3 is referring to). The manual for the board ( http://www.hartetechnologies.com/manuals/Northstar/NorthStar%2032k%20RAM-32… ) says that the RAM is 200ns access time. I can find a source for MM5298N-4B chips, but I don't know if the 4B is still fast enough. I'll replace the entire bank of 9 chips at the same time so that they are matched. Thanks for any assistance. Ian

9 years, 11 months

DRAM memory for NorthStar Horizon

by james＠attfield.co.uk

Ian, I'm afraid my NatSemi data book only goes up to MM5290 (16Kx1 Dynamic) but the '-3' variant is 200nS as is the MM5298-3 and it lists the '-4' variant as 300nS. Unless I had no option I wouldn't use the slower chips whereas the 150nS would do fine although without any real feel for the tolerances of the chips, board design wait circuitry (if exists) or the refresh controllers it is not really possible to say with any degree of certainty.

9 years, 11 months

Parallel Port/Firewire/USB to IDE Bridge Specs

by t.gardner＠computer.org

Anyone have any specs on any of the several chips or controllers that were used to bridge IDE HDDs to another interface such as PP, FW or USB. I'm thinking of products of Shuttle Technology, Indigita, ASP, etc. Alternatively, can anyone point me to an open source driver code for such bridges, perhaps Linux? Tom

9 years, 11 months

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test-drb August 2014