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101090 discussions

by ddameron＠earthlink.net

Hi Tony and all, At 10:44 PM 1/14/99 +0000, you wrote: >I would strongly disagree with that, at least in hardware. I've recently >been looking at some discrete-transistor logic circuits and the >creativity that went into their design (IMHO) exceeds anything that I've >seen done with modern 'black-box' chips. For example, I've seen a >keyboard encoder (8*8 matrix of keys to 6 bit binary + strobes + ...) in >about 20 transistors and as many diodes. Much, much more elegant than >throwing a microcontroller at it. > Yes, for example the Popular Electronics keyboard in ~1974 by Don Lancaster and Southwest Technical Products used a few inverters (RTL) and transistors. 3 transistors sensed which of 8 columns a keyswitch was pressed, and these 3 transistors produced 3 of the ASCII output bits. The 8 row ouyputs produced 3 other bits. Much easier to "fix" than the MOS encoder chip, if that chip was programmed for a custom matrix, such as the Heath H19 terminal. -Dave

27 years, 8 months

Dapple computer

by rigdonj＠intellistar.net

Hi, I was digging thru the junk ^H^H^H^H er, ah, treasures at my favorite scrap dealers a few days ago and found what looked like an Apple IIe except it was marked "Dapple (something) IIe". I've never heard of a Dapple computer before. Is there anyone that collects Apple clones and wants it? Joe

27 years, 8 months

power supply for Zenith supersport sx laptop

by lemay＠cs.umn.edu

I have this Zenith supersport sx laptop (386, black and white screen i think) but no power supply.. The label on teh bottom of the unit states that it wants 16.5 volts, 2 amps... The power connector is one of those small round plugs, and it has a DC noted next to the plug. Does anyone know where I could find a compatible power supply? -Lawrence LeMay lemay(a)cs.umn.edu

27 years, 8 months

Old ISA Riser card on a Pentium?

by gareth.knight2＠which.net

Kirk Davis >Hey, don't forget that $100 Atari Belt buckle (only one at >that price!!!) :-) Perhaps you would be interested in a once in a lifetime offer of an Amiga CD32 umbrella (never used), or a chocolate tea pot, or... Anyway, does anyone have experience with Riser ISA cards. I have one salvaged from a Viglen 25MHz 486 and want to connect it to a Pentium 2. The Riser card has 6 ISA ports.

27 years, 8 months

Computer paint jobs (was Re: SOL feeding frenzy?)

by Watzman＠ibm.net

This may or may not be a description of your situation, but when I worked at Heath/Zenith, we bought "Gold" floppy disk drives directly from the manufacturers of the drives (Shugart, Tandon, etc.) that were painted gold for use as duplicators in producing the commercially sold software (operating systems, languages and applications). These were hand-calibrated drives with essentially perfect alignment. Not saying that this is what you have, but it is possible. Barry Watzman ---------- From: Bill Sudbrink [SMTP:bill@chipware.com] Sent: Wednesday, December 16, 1998 10:39 AM To: Discussion re-collecting of classic computers Subject: RE: Computer paint jobs (was Re: SOL feeding frenzy?) In one of the Ohio Scientific C2's I have, the face plate of one of the 8 inch floppies has been painted gold! The rest of the unit was classic tan/brown and the guy I got it from had no idea why.

27 years, 8 months

classic computer stuff in Scientific American

by fmc＠reanimators.org

"Lawrence Walker" <lwalker(a)mail.interlog.com> wrote: > I have that edition in my collection. I have 2 other S.A.s > that have micro themes. The Nov. 65 issue, one of the articles is > by Hao Wang , and the Sept 66 which is all computer related > articles And I think Scientific American re-published the September 1966 issue as a book, "Information". -Frank McConnell

27 years, 8 months

hello

by lemay＠cs.umn.edu

Hi. I've just joined your mailing list. Currently I'm working on getting a Cromemco Z2 system with dual 8" DSDD drives setup. I have cp/m 2.2 and CDOS. Unfortunately, I have no docs, except a cp/m 2.2 manual I downloaded from the web. If anyone has a similar system, and can make a cp/m 3.0 8" floppy, i'd appreciate it. My plans are to attempt to rewire a Teac 5.25" floppy drive to make it appear to be a DSDD 8" floppy drive. I have several Terak computers in need of serious work. These were computers that would break down frequently back when they were in service back in tehe 80's, so they break down after being 'repaired' (the contacts seem to go flakey, both on teh boards and mainly on the socketed ram chips). If anyone has any technical information on the Terak floppy controller, or on the shugart 800 floppy drives in the Terak, i'd like to have a copy. preferrably I would want to setup my 5.25 floppy drive so it can be used on either computer system, but the Terak uses a 40 pin ribbon cable, skipping pins 1-10 on the shugart drive. I'm curious as to which connectors on teh interface cable are actually necessary for the Terak floppy controller to operate properly. -Lawrence LeMay lemay(a)cs.umn.edu

27 years, 8 months

Classic Home Console Computers to Trade/Sell/Buy

by Philip.Belben＠pgen.com

> Hi Everyone, > > I'm new to this list. I've been collecting classic home console computers > for about two years now and have some items to trade and some things I'm > looking for (either trade or buy). You can check out my collection on my > website at http://www.markrandall.com. Hi Mark. Afraid I haven't time to look at your website just now, but your list looks impressive. Since you're new here, I feel I should tell you: one thing you must remember on this list, if you are offering anything for sale or trade, YOU MUST SAY WHERE YOU ARE. Looking at your list of your collection and your list of wanted stuff suggests you are not in the UK (as I am), but probably somewhere in the US. But more than that I can't tell, and it may be important! Philip.

27 years, 8 months

Osborne 01 for only $5000.00

by sinasohn＠ricochet.net

At 10:27 PM 1/13/99 -0500, you wrote: >went for 2.7 Million, with an addition 305k being paid in commission >by the purchaser... A far cry from 7 Mil... For values of x, where x = my bank balance, 3mil * x = 7mil * x. It's all the same to me. 8^) --------------------------------------------------------------------- O- Uncle Roger "There is pleasure pure in being mad roger(a)sinasohn.com that none but madmen know." Roger Louis Sinasohn & Associates San Francisco, California http://www.sinasohn.com/

27 years, 8 months

Altair kits??

by rigdonj＠intellistar.net

At 10:36 AM 1/7/99 -0500, you wrote: >>QUESTION - to any of the folks out there who >>put these kits together originally... >>Is this the way you received them from MITS? >>With the front panel and/or the power supply >>pre-wired and assembled? I never built one from a kit but what I have been told MANY times is that the front panel and PS were customer assembled and the front panel was an absolute BITCH to build! Seems there was a mess of wires running from all those front panel swiches to the motherboard and it was hell to get them all connected correctly and to work in among all of them. Joe

27 years, 8 months

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