test-drb October 2004

test-drb@ccmp.vtda.org

245 participants
540 discussions

PDP 11/70: MK11 memory crate, M9312 cards, and wiring...

by julesrichardsonuk＠yahoo.co.uk

On Sat, 2004-10-09 at 22:47 +0200, Gooijen H wrote: > I checked the wiring in my 11/70. > On this M9312, TP1 and TP2 are connected to a small push button which is > mounted on the bottom end of the front panel. Certainly not original, > but that is how I got this 11/70. > >From the MK11 MOS memory box above the 11/70 is indeed a small cable > that connects to the M9312. This cable enters the 11/70 at the rear side > and runs, over all the boards in the space where all the flat cables are, > to the M9312. The white/black goes on TP3, and the blank one goes on TP4. Thanks - just what I needed! :-) > For its function, check the 11/70 manual :-) Heh - I was staring at DEC engineering drawings for hours and it was giving me a headache! I need to look at all the info for the memory crate though as the CPU still isn't happy (the run lamp's permanently on and we can't halt the CPU or toggle any data in from the front panel). All cards look to be OK in the CPU though, but I suspect there may be a problem with the memory... > I do not use the battery for MOS memory backup in case of a power failure > so I can not be of much help here. No problem - we're not intending on using it either; I just wanted to check that it should be OK without it. Time to do some reading this week! We did discover the limit of the power cabling in the museum room though - with the 11/34, 11/44, HP T500 and a few assorted terminals running we hit the 30A limit on the breaker and blew the power out to the room :-) Luckily we've found a few power outlets that are on a different breaker, so we can move some big stuff over onto that and spread the load. Still, adding the Marconi machine, Elliott 803 and the Decsystem 570 with the three massbus drives into the mix is going to make things interesting. The startup sequence for everything is going to be pretty critical... cheers Jules

20 years, 2 months

8-track tape drives?

by bnansel＠verizon.net

About twenty years ago I bought a dual tape drive "mass" storage peripheral from a surplus outfit, United Products in Seattle. It was for a long defunct personal computer of the '70s. The computer (which I only ever saw in a few ca. 1978 ads in Byte) was an 8080-based system, and I think it was billed as having color video graphics capability. I don't remember the name of the company. Anyway, the distinguishing characteristic of the system was the tape drive unit used modified 8-track tape decks. That's right, 8-track *audio* cartridges, the kind people make so much fun of these days. The drive was housed in a blue metal enclosure with a black vacu-formed plastic bezel for the two "drives." It had a DB-25 connector on the back, though it definitely wasn't a standard RS232 interface. As I recall, the tape head assembly in each drive had four read/write coils, and it could move to one of two positions, up or down, thus giving eight tracks total. Presumably this was to decrease the "seek" time. I managed to trace through the circuit well enough to figure out how to write and read back serial data on tape, at about 2400 bps, as I recall. I had some fun hooking it up to a C64 in the lab to prove the thing was actually working. I kept threatening a co-worker that I was going to write a driver for the monstrosity to use on the lab's CP/M machines. He had just built a Slicer, a 80186 SBC that was popular for a few years in the mid-eighties, and the thought of such a kludge horrified him. Heh. I foolishly sold the dual tape drive and all my notes at a Seattle Robotics Society auction sometime around 1989. I've done some poking around on the web recently, but I have found zip about this machine. Has anyone ever seen one of these tape drives? I actually have a project that, perversely, requires something like this. -RLN

20 years, 2 months

KSR33

by res20nop＠verizon.net

Hello Tony, I found a request on the internet today but the posting was made over a year ago. I wish I would have seen it then because I have this thing that I want to get rid of. It is a KSR33 Teletype with the interface converted to RS-232. It is still in working order but probably needs a new ribbon after sitting for at least 20 Years. I also have other vintage equipment that used to be connected to the teletype. It is an old PDP11-05 (DEC). Let me know if you are interested. Ken

20 years, 2 months

Serial Port Expanders

by KParker＠workcover.com

I've got PC-MOS/386 and wonder if serial port expanders for a 386 or 486 can still be sourced. A hunt of the net opened a minefield of such devices - hoping I can get some help from this list. TIA!!!! ++++++++++ Kevin Parker Web Services Manager WorkCover Corporation p: 08 8233 2548 m: 0418 806 166 e: kparker(a)workcover.com w: www.workcover.com ++++++++++ ************************************************************************ This e-mail is intended for the use of the addressee only. It may contain information that is protected by legislated confidentiality and/or is legally privileged. If you are not the intended recipient you are prohibited from disseminating, distributing or copying this e-mail. Any opinion expressed in this e-mail may not necessarily be that of the WorkCover Corporation of South Australia. Although precautions have been taken, the sender cannot warrant that this e-mail or any files transmitted with it are free of viruses or any other defect. If you have received this e-mail in error, please notify the sender immediately by return e-mail and destroy the original e-mail and any copies. ************************************************************************

20 years, 2 months

Vintage HP 5036A Microprocessor Lab 8085 c/w Book

by rigdonj＠cfl.rr.com

<http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=1504&item=3845469946 &rd=1&ssPageName=WDVW> Joe

20 years, 2 months

8279 Datasheet

by nbreeden2＠comcast.net

I'm looking for a datasheet for an 8279 chip (Keyboard / LED controller), I haven't found anything useful on the net. A PDF of the original Intel datasheet would be preferred. Thanks -Neil

20 years, 2 months

Why are all of my TRS-80 Model 200 portables dead?

by tosteve＠yahoo.com

I have *five* Model 200s now, and not a single one works, but I have just as many Model 100s, and every single one works. Is this just bad luck, or is there something defective about the design? Steve. __________________________________ Do you Yahoo!? Yahoo! Mail - You care about security. So do we. http://promotions.yahoo.com/new_mail

20 years, 2 months

Burroughs L9000

by dwight.elvey＠amd.com

Hi I just saw a request for help in repairing one of these on alt.folklore.computers. It seems that this company was actually using this machine. They are having problems with the printer ( no wonder ). They are in the LA area. I would suspect that after getting things printed out, they might be interested in parting with it ( if they had any sense ). It would be a good opportunity for a local collector. Dwight

20 years, 2 months

How to access BIOS setup on Philips P3230?

by vcf＠siconic.com

Does anyone care to help this person? See below. ---------- Forwarded message ---------- Date: Fri, 15 Oct 2004 16:52:53 -0700 From: Robin Rae <freebace(a)fastmail.fm> To: vcf(a)vintage.org Subject: shot in the dark. I've been ripping my hair out and was wondering if someone there could help, I need to know how to access BIOS setup on a Philips P3230 (286/12.5) the only site i knew of that had manuals has disappeared. any help would be greatly appreciated. -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

20 years, 2 months

[BBC-Micro] Signitures

by pete＠dunnington.u-net.com

On Oct 15 2004, 18:30, Jules Richardson wrote: > On Fri, 2004-10-15 at 10:36 -0700, Saddler, Chris wrote: > > Returning to the original OT subject of this thread, where are the rigid > > rules of news group message format defined? > > Do you mean news (i.e. usenet), or email? > > Email seems to be covered by RFC822, and news (the message format) by > RFC1036 - however a quick glance doesn't show either of them to mention > anything about signatures. I think it's just something of an unspoken > standard that '--' on a line by itself is a signature separator - but as > far as I can tell there's nothing in the specs to say that, nor the > actual purpose of the signature... It's not "--" but "-- ", and must be immediately preceeded and followed by a newline. It appears in RFC2646 as a "convention" -- but it's worth remembering that RFCs are not (mostly) standards either -- just conventions. There's a document called "son of RFC1036" which is the basis that almost all modern newsreaders follow, anmd you'll find the sig separator described in there. "son of RFC1036" was written, mainly by Henry Spencer, one of the original authors of RFC1036, because there are some errors/inconsistencies in RFC1036 which needed addressed; there's also a widely-used document called the GNKSA (Good NetKeeping Seal of Approval) where it appears as section 15. Both of these were the result of much discussion on Usenet and appeared because although the IETF produced many drafts of a successor to RFC1036, none were ever finalised. -- Pete Peter Turnbull Network Manager University of York

20 years, 2 months

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test-drb October 2004