test-drb December 2007

test-drb@ccmp.vtda.org

215 participants
420 discussions

by listmailgoeshere＠gmail.com

Hi list, I have 7 2000-sheet boxes of tractor-feed plain 11x14.5" listing paper which I'd like to give away as I need the space back. Located in West Yorkshire, UK. Sorry, it isn't greenbar ;) There are also 3 boxes of A4-ish size (11x9.5" I think they are). Free, but you'll have to collect. I'd ship if you're desperate, but it won't be cheap as they're heavy. Please drop me a mail if you're interested - thanks. Ed.

16 years, 7 months

1000+ old computer in Canada, for sale

by tosteve＠yahoo.com

"Rawn's Buy & Sell Network" in Burnaby BC (Canada), says he has a warehouse fill of old computers to hopefully sell as a lot. Consists of mostly 80s and 90s systems, like Apple, Macs, IBMs, Next, Commodore, Atari, Tandy, Hyperion, etc. as well as tons of software. Here are some pics he sent me: http://members.cox.net/oldcomputerads/oldpics/old.html Do not contact me, please contact: rawnsbuysell at lightspeed.ca Enjoy! ____________________________________________________________________________________ Be a PS3 game guru. Get your game face on with the latest PS3 news and previews at Yahoo! Games. http://videogames.yahoo.com/platform?platform=120121

16 years, 7 months

Homebrew Drum Computer

by bnansel＠bigpond.net.au

I'm looking at what it would take to make a barebones "museum piece" bit-serial computer along the lines of an LGP-30 or maybe a Bendix G-15. I don't want to do the whole vacuum-tube-computing trip, so I'm limiting my madness to discrete bipolar transistors, specifically the 2n2222. To keep it interesting, I want to use only components available to mortals in 1963. And the keep the project within budget (i.e. none to speak of), I'm further limiting the number of transistors semi-arbitrarily to 256. Of course there will be a pile of si diodes, resistors and capacitors involved, but the idea is to keep the number of active components down -- if only so this beast will fit in the boot of my car! I've scavenged the web for information on bit-serial magnetic drum machines of the Elder Years, and I think I have a pretty good notion of how they worked (mostly very slowly). What I haven't been able to get a handle on is how to make a serviceable magnetic drum. I reckon I can do some simple prototyping with some CMOS 64-bit shift registers so I don't have to debug both the logic and the magnetic read/write electronics, but beyond that I have only a hazy idea how to proceed. Certainly I could trash a few old cassette decks, or even get some floppy R/W heads to experiment with audio recording tape super-glued to a soda can, but I really want to get at least the performance the old machines could produce, so that means a reasonably fast drum RPM, somewhere around 6000 RPM, say. Any ideas?

16 years, 7 months

need info on old eprom programmer

by dc.hunt＠worldnet.att.net

We have one that does not work as well as the original manuals. We cannot get ours to work as we do not have the breakout cards for troublreshooting thi unit.Contact us if we can possible help you.

16 years, 7 months

Homebrew Drum Computer (magnetic heads)

by cclist＠sydex.com

> Date: Mon, 17 Dec 2007 09:31:49 +1030 > From: Robert Nansel <bnansel at bigpond.net.au> > I think I might have a whack at making R/W heads using small ferrite > cores/beads, the kind used in radio work. ...lots of detail... > So, aside from the mumbles, does this sound like a workable plan? I'd think that you'd want the head characteristics to be a very close match if you intend to employ more than one head per track--and I can't see how you'd get the head gaps remotely close in characteristics with one another. On the local Freecycle, I see VHS recorders hitting the landfill with incredible regularity. Why not simply scavenge the heads from a few of these? Certainly, the frequency response should be good enough. As far as the disk goes, that should work. It seems to me that some of the Shugard SA-4000 models even had a track or two of fixed heads as an option. Cheers, Chuck

16 years, 7 months

Shift Registers as Delay Lines (was Delay lines in TV sets)

by dm561＠torfree.net

Date: Tue, 18 Dec 2007 10:03:34 +0000 From: Ethan Dicks <ethan.dicks at usap.gov> Subject: Re: Shift Registers as Delay Lines (was Delay lines in TV sets) On Mon, Dec 17, 2007 at 06:52:59PM -0500, Allison wrote: >> MOS shift registers of lengths greater than a few bits are very late >> 60s (after 67 or so). By early 70s parts 1024 long ere not uncommon. >I think I have a couple of old SAD1024 MOS shift registers from when I >was collecting deeply discounted items from the local Radio Shack >"Manager's Table" as a kid. >I had thought one day to make the audio echo/delay circuit I think I >saw in an old Forrest Mims circuit book, but a solid-state acoustic >delay line emulator sounds like a much cooler place to put them. >-ethan ___________ Sounds like our shopping habits were the same in those golden days at the 'shack ;-); I've still got a couple waiting for me to get a round tuit (the data sheet also has the bucket brigade audio delay schematic). As a digital delay line I guess you could even use it word-wise since it's analog; you'd need some pretty fast DAC/ADCs though. mike

16 years, 7 months

green-bar paper

by shumaker＠att.net

Wasn't someone on the list looking for wide format green-bar paper a while back? PublicSurplus.com has several boxes listed. Items 228477, 228478, 228480 s shumaker

16 years, 7 months

PDP Collectors Group on LinkedIn

by root＠parse.com

If you're a linkedin user, there's a PDP Minicomputer Collectors Group that I created last week. You're all invited to join. Details can be found at: www.parse.com/~museum/linkedin.html (While the PDP-10 isn't a "minicomputer", we'll let PDP-10 people join anyway :-)) Cheers, -RK -- Robert Krten, PARSE Software Devices, http://www.parse.com/resume.html Wanted: DEC minis: http://www.parse.com/~museum/admin/wanted.html

16 years, 7 months

CrayLink connections between Origin 2000s

by jvdg＠sparcpark.net

> Sounds like an ordinary (for SGI types of ordinary) Onyx2. That has the > framebuffer hardware in the upper module, and CPUs in the lower; one > framebuffer module per machine, but up to 7 (IIRC) CPU modules in > multi-rack configurations. Seven CPU modules is unpossible. The (hyper)cube topology nust be maintained, so you can only expand a machine by doubling the number of modules connected together. Powers of two. ,xtG tsooJ

16 years, 7 months

IBM 8-inch diskette

by c.heidelmeyer＠excite.com

I have three old 8-inch diskettes with graphic files on them from an old MRI machine, probably a Siemens Magnetom 1 using a VAX computer. I would like to compare the old pictures with modern MRI or CT scans or X-rays taken of the same person. Would someone in the UK be able to read them and store the files on a modern diskette or CD? I can read 5 1/4, 3 1/2 or CD. Kind regards Carl Heidelmeyer Consultant Anaesthetist Portishead UK

16 years, 7 months

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test-drb December 2007