test-drb September 2008

test-drb@ccmp.vtda.org

220 participants
323 discussions

by gsimpso3＠bellsouth.net

Hello Adrian; I read a thread from 2004 on classiccmp.org's website about your CPT 8000 and wonder if you still have it? If so I may be able to help you out with any missing parts, program disks, diagrams, etc. just for the price of shipping. I used to service the machines for the local vendor from 1980 to 1990 and rescued a pile of parts and documentation that were headed for the dumpster when they were made obsolete by the PC in the late '80s. I even managed to save several intact machines. The CPT 8000 and its descendants were quite advanced for their time and had features that CPT's competitors (IBM, Wang and Lanier) couldn't come close to matching. I haven't fired my 8135 up in quite a few years so I'm not sure if any of the software floppies are still readable. All my program disks may already be unreadable. --Gary Simpson

15 years, 10 months

ENIAC vs. ENIAC-on-a-Chip IC implementation

by wbblair3＠yahoo.com

Brent Hilpert wrote: > > Getting the 1946 documentation set would be a good > start. CHM had the first > > volume, which had a partial transcription on the chip > web site which I've > > scanned and put up under > http://bitsavers.org/pdf/univOfPennsylvania/eniac > > Thanks, that's far more info and detail than I've > seen anywhere else to date. > Looks like it may be most of what one needs for a machine > definition, but have > to study it more to see if one can derive > 'everything' from it. The 207 page ENIAC patent is pretty detailed: http://www.fh-jena.de/~kleine/history/machines/EckertMauchly-ENIAC-us-paten…

15 years, 10 months

Available for pickup: IBM hardware, FC SAN

by pat＠computer-refuge.org

I've got access to some IBM H50 systems that are being retired from work, with 4x332MHz processors, 3+GB ram (whatever the max is, 3.25 or 3.5GB I can't remember), some disks, and a 10/100 NIC. The disks have been erased, but they'll run up through AIX 5.3 I think. I'm not going to ship these because of weight, but shipping one or two parts from one is probably doable. Cost will be not unreasonable, but not free. :) I can hold onto them for a week or two probably, but not much longer than that. I'm also try to rid myself of my old 1Gb, MTI Fiberchannel gear. I've got a switch or two, and several 12-disk (1.6") 3U JBODs with 36GB and 50GB 1.6" tall FC-AL 1GB disks. I could pull and ship disks from this if you want them in multiples of 12, but I don't want to try to ship this either. These will probably be around for a month or so before I have to do something I don't want to with them. :( Make offers.. Also, if by any chance, someone is interested in driving here and picking up a frame or 3 of IBM SP nodes (quad 375MHz POWER3-II thin nodes) or an E10k, let me know... These are in West Lafayette, IN, USA (47906). Pat -- Purdue University Research Computing --- http://www.rcac.purdue.edu/ The Computer Refuge --- http://computer-refuge.org

15 years, 10 months

vac tubes / was Re: Schematics of Atanasoff-Berry

by wbblair3＠yahoo.com

Chuck Guzis wrote: > > Can't get much cheaper than effectively free for a well regulated, > > high current DC power supply using a modified PC power supply that > > isn't otherwise being used. Plus, the idea of using tubes with 5V > > filaments instead of 6.3/12.6V reduces the competition with typical > > audio tube customers and makes the use of a high-current 5VDC > > supply possible. > > For digital circuits (I assume that's what we're > still discussing), why is a DC heater supply necessary? Because I don't want to hear 60Hz hum when I plug my headphones into the flip-flop output. ;-) Seriously, you are absolutely correct that AC could be used for the filaments in this case, but the PC power supply is being built for multiple uses and will just happen to be there for these tube logic experiments. I planned to mod the PC power supply well before coming up with this low voltage tube logic project (which may or may not succeed). My goal is also to provide a commonly available, cheap and multi-use power source for the tubes that could be duplicated by others if I succeed in this and decide to put the tube logic project on a web page. Like me, rather than just building a supply that would be used only with the tube project, they would be building a very cheap, high-current DC power supply useful for other purposes. > If you do decide to use a regulated DC supply with > overcurrent protection, keep in mind that cold heater inrush current > can be substantially greater than the nominal heater current > rating. Right now, my goal is to build just an astable multivibrator clocking a 4-bit counter. To show the alternating state of the multivibrator, I'll light the tube from below through the hole in the center of the socket with a two-color LED and the states of the counter tubes will be indicated by lighting them from below with a red or blue LED. I've got the special effects visualized, but that's the really easy part.

15 years, 10 months

DG Aviion

by rborsuk＠colourfull.com

Hi All, I'm looking for someone with a Aviion 88k box they would like to get rid of ($$ or trade). I have over 2 dozen hard drives loaded with software that I would like to archive before I re-commission the drives. Please drop me a line off list. Thanks Rob Rob Borsuk email: rborsuk at colourfull.com Colourfull Creations Web: http://www.colourfull.com

15 years, 10 months

OT: Microsoft crazy academic deal

by tonym＠compusource.net

I thought some of you might appreciate this... Microsoft is offering for one day only, today, Office Ultimate Edition for $59.95. This has everything in it, I think retail is like $500-600. www.theultimatesteal.com Ya need to have access to an email address at a .EDU though. You enter in the email addy, and it emails a link to the address. Not a bad deal, for excel, access, Word, Ourlook, PowerPoint Got it for my wife, as she is working on her BS at Florida Atlantic They will apparently have Windows Vista Ultimate for $65 at the same site on 9/8/2008 I think the deal ends at midnight, or I think you had to have registered for it, and gotten the email by midnight. Tony

15 years, 10 months

ENIAC vs. ENIAC-on-a-Chip IC implementation

by aek＠bitsavers.org

> I'd still like to make up some web pages with a proper machine definition. Getting the 1946 documentation set would be a good start. CHM had the first volume, which had a partial transcription on the chip web site which I've scanned and put up under http://bitsavers.org/pdf/univOfPennsylvania/eniac The University of Pennsylvania archives probably have at least one set of manuals.

15 years, 10 months

vac tubes / was Re: Schematics of Atanasoff-Berry

by tshoppa＠wmata.com

Roy wrote: >On Wednesday 03 September 2008 23:21, bfranchuk at jetnet.ab.ca wrote: >> William Blair wrote: >> > Right now, my goal is to build just an astable multivibrator clocking a >> > 4-bit counter. To show the alternating state of the multivibrator, I'll >> > light the tube from below through the hole in the center of the socket >> > with a two-color LED and the states of the counter tubes will be >> > indicated by lighting them from below with a red or blue LED. I've got >> > the special effects visualized, but that's the really easy part. >> >> Would not a green & red Ne-2 would fit the mood better. >> If you have the HV why not go nixe tube? > Given 4-bit binary, how many more tubes do you think it'd take to do the > 1-of-10 decoding? No more tubes, if you're clever enough! Look at the HP AC-4 schematics and manuals; they are very very clever, and I believe that this decoding-with-neon- logic scheme predates HP. Many other 4-tube decimal counter modules from other companies (I have a buttload of Berkeley Nucleonics ones) use the same principle with very slight variations. Using green and red NE-2's is probably out; they have different threshold voltages, although with some good characterization you could probably do it. Not only do I have 40-year-old modules that do this stuff, I've also built it with 6SN7's and modeled it with SPICE. For lowish speed counters (<100kHz) the tolerances do not have to be tight. Requisite AC-4 references: http://www.hparchive.com/Manuals/HP-AC-4A-4B-Manual.pdf http://www.prc68.com/I/HPac4a.shtml Patents named in AC-4 documents, find them at http://www.google.com/patents/ 2,404,047 (1946) 2,410,156 (1946) 2,521,788 (1950) I believe this is the first place where I see the neon decoding scheme 2,538,122 (1951) 2,762,915 (1956) Tim.

15 years, 10 months

Free Linux and OpenOffice - even if your email address doesn't

by tonym＠compusource.net

>-----Original Message----- >From: David Griffith dgriffi at cs.csubak.edu >Sent 8/31/2008 6:38:15 PM >To: General Discussion: On-Topic and Off-Topic Posts cctalk at classiccmp.org >Subject: Re: Free Linux and OpenOffice - even if your email address doesn't > >I just chucked out a bunch of Linux CDs from 1993/1994... > >-- >David Griffith I'm probably going to have to do the same thing... I have multitudes of trans-ameritech cd's, not to mention super-old versions of RH, TurboLinux, OpenLinux... Man - are we packrats, or what? Tony

15 years, 10 months

Slightly OT: SR-52 Service manual

by quapla＠xs4all.nl

Try 'http://www.ti59.com'. Ed > Rik Bos wrote: >> I'm bussy restoring a Ti SR-52 and having some trouble with the card >> reader > [...] >> So I'm searching for a schematic diagram or service manual. > > I had a paper copy around 1979, which wasn't too hard to get at the > time. IIRC, I just called TI's Lubbock, TX office and asked for a copy, > and they sent it to me. I doubt that they have them any more, but if > they were easily obtained (unlike HP calculator service manuals), there > are probably people out there that still have copies. > > The TI-58/59 service manual is more commonly available. It's possible > that the card reader is similar enough for that manual to be useful to > you. > > Eric >

15 years, 10 months

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test-drb September 2008