test-drb February 2003

test-drb@ccmp.vtda.org

337 participants
780 discussions

by alhartman＠yahoo.com

I have a set of pages about this unit on my website... http://www.geocities.com/macemulist/nutek.html I'd like to buy one of these, if I can find one. If anyone on this list has one in any condition (hopefully working or repairable), please contact me off list... Basically, this was an attempt to clone the Mac including making a Clone OS. If you have one of these, I'd love to get copies of any floppies that came with it, manuals, and a dump of the ROMS even if you don't want to sell yours. It would be interesting to see if the ROMS would work on one of the many Mac Emulators, or could be made to work. Regards, Al Hartman (Macintosh Emulation List Host) http://www.topica.com/lists/MacEmuList Enlightenment means taking full responsibility for your life. - William Blake

21 years, 8 months

How about this price not being accepted for a Magazine

by jrkeys＠concentric.net

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2155564921

21 years, 8 months

Chip ID on Fujitsu MB15140 needed

by Innfogra＠aol.com

I seem to have a couple hundred MB15140s in their original Fujitsu IC boxes. Does anyone have an idea what they are? Picture at http://members.aol.com/innfosale/MB15140A.JPG Is there a Fujitsu chip list on the Internet available? Google did not bring anything up for me. The date codes are 8809 so they are on topic. I got them from Fujitsu nearly 10 years ago and uncovered them recently. I would not be surprised if they were for the Fujitsu 8" or 14" hard drives since I bought a lot of new parts when they dismantled their 8" line in Hillsboro, OR. Any help appreciated. Paxton Astoria, OR

21 years, 8 months

Electrolytic cap "protection"

by dwightk.elvey＠amd.com

>From: "Bryan Pope" <bpope(a)wordstock.com> > >Hey all, > > Awhile ago there was a thread about electrolytic capacitors popping and >then destroying the motherboard they are on. One of the ideas was to >replace them before they go. > > Now I was wondering about another idea... Would it be okay to encase >the capacitor in silicone gel? Then when the capacitor pops, it wouldn't >spread its electrolyte all over the motherboard. > > But would this cause other problems with heat or something? Would it >further shorten the life of the capacitor? > >Cheers, > >Bryan > Hi There isn't much you could cover it with that would stop a cap >from blowing. The pressures can get to several thousand PSI if there isn't a relief someplace. Wrapping several layers of paper towel around them might be better. This would at least keep the mess from the PCB. There was an article about some bad capacitors made in the last few years. According to the story, someone stole a formula for the electrolyte and the formula was missing some key ingredient ( most likely a depolarizer ). The caps made this way would out gas and rupture. Dwight

21 years, 8 months

Xerox 8/16 available in Baltimore, MD area

by vcf＠siconic.com

See below. Contact original sender. Reply-to: <bernhardbang(a)netscape.net> ---------- Forwarded message ---------- Date: Fri, 07 Feb 2003 19:43:03 -0500 From: bernhardbang(a)netscape.net Subject: Zerox 16/8 Gentlemen, I have a Zerox 16/8 computer, complete with instruction manuals. Barely used. Includes Monitor and keyboard. Is it of any value? Do you want it? Who might want it? Thank you for your reply! Bernhard Bang 4208 Wickford Road Baltimore, MD 21210 -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org * Old computing resources for business and academia at www.VintageTech.com *

21 years, 8 months

Seeking info on two PROM chips.

by pete＠dunnington.u-net.com

On Feb 10, 8:03, Paul Thompson wrote: > On Mon, 10 Feb 2003 pete(a)dunnington.u-net.com wrote: > > > E8 means they're 128KB, or 1 Megabit. The part numbers you quote are > > listed in Compaq Assisted Services online catalogue at $4 apiece, so > > you might still be able to get them from DEC/HP. > > I am not sure I have the URL for this, unless it is something I know by > another name.... Try a web search for "Compaq Assisted Services" or for the 23- part numbers you quoted? :-) Or http://www-legacy.digital.com/CAS-Catalog/pric.html -- Pete Peter Turnbull Network Manager University of York

21 years, 8 months

Electrolytic cap "protection"

by pete＠dunnington.u-net.com

On Feb 10, 10:58, Bryan Pope wrote: > Awhile ago there was a thread about electrolytic capacitors popping and > then destroying the motherboard they are on. One of the ideas was to > replace them before they go. > > Now I was wondering about another idea... Would it be okay to encase > the capacitor in silicone gel? Then when the capacitor pops, it wouldn't > spread its electrolyte all over the motherboard. > > But would this cause other problems with heat or something? Would it > further shorten the life of the capacitor? Well, it's not going to improve its life, and it does mean that when it goes, it will make a louder bang, since it will be harder for the electrolyte to get out. Silicone isn't terribly strong, so it won't stop it. If you look at most electrolytic caps, you'll see they're designed to come apart under stress without turning into small grenades; the ends are scored, or the seals are deliberately made less strong than the aluminium case. -- Pete Peter Turnbull Network Manager University of York

21 years, 8 months

Assembly on a Apple IIc+

by pete＠dunnington.u-net.com

On Feb 8, 11:06, Jim Keohane wrote: > The reference to "one cycle" instruction may have been referring > to there being 2 cpu cycles per clock cycle. Also, there's the "pipelining" > some say the 6502 does when the last (or only) byte of an instruction is > acted upon simultaneous to next instruction's 1st byte (opcode) being > fetched > > So perhaps "one instruction per clock cycle" may be awfully close with > pipelining and with use of zero page. You must be thinking of some different 6502 to the rest of us :-) As Sellam said, no 6502 opcode takes less than two clock cycles to execute, and most take more (up to 7): the only 2-cycle instructions are the ones with implied addressing, like RTS, CLI, TAX, ... This is why a 6502 running typical well-written code, running on a 2MHz clock, manages at best around 0.7 MIPS. There's no pipelining at all in a 6502. No overlap of instructions whatsoever. Zero-page instructions like LDA $12 take three clock cycles. There aren't two CPU cycles per clock cycle. Perhaps you're thinking of the fact that the 6502 uses a two-phase clock, and does part of the CPU cycle during phi-1, and part during phi-2? > Of course, we're talking Apple ]['s which, if I can trust my memory, > steal every other clock cycle to refresh memory. I believe you're thinking of how it uses part of the clock cycle when the CPU isn't accessing memory, not alternate clock cycles. > > > p.s. I also did quite well with 6502 asm code in cpu speed tests vs > > > 80x86 and Z80 programmers. The zero page, for all intents and purposes, > > > is 256 registers. That was the designers' intention, but you have to remember that it takes an extra clock cycle to access a zero-page location rather than a register. -- Pete Peter Turnbull Network Manager University of York

21 years, 8 months

Who here has a Planar ELT-320?

by glenslick＠hotmail.com

Had I known that I might have bid on the first one that came up on eBay recently. I thought it might be just a fancy paperweight without the proper keyboard. I'll watch for a reasonable deal on one of those to show up again sometime. >From: Eric Dittman <dittman(a)dittman.net> > >The ELT320 can use either an AT-type keyboard or an LK201-type >keyboard (I have an LK401 connected to mine). _________________________________________________________________ Help STOP SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail

21 years, 8 months

PACEMIPPS?

by ken＠seefried.com

From: Joe <rigdonj(a)cfl.rr.com> >Can anyone tell me exactly what a PACEMIPS PIMM - 33SG144C is? It's >made byPerformance Semiconductor but it's not listed on their (POOR!) >website. I THINK it might be an R33000 embedded processor but I'm not >sure. Performance Semi, AFAIK, generally does semiconductors for military/aerospace applications. I recall dimly that they made some MIL-SPEC MIPS devices; this would perhaps be one of them. The part number you cite is not familiar, but might be one of the line of R3000+R3010 derivatives. Not as esoteric as their relatively popular MIL-STD-1750A processors, but unusual none-the-less. I've actually got some Performance Semi 1750A chipsets...I must think of something to do with them... Ken

21 years, 8 months

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test-drb February 2003