- vcf-midatlantic - lists.vcfed.org

TEI MCS-CPU 8080 CPU Board
by Systems Glitch 01 Jun '16

01 Jun '16

I picked up a TEI MCS-CPU from Jeff Galinat at VCF East XI this year. It's an 8080 CPU board with onboard power-on jump, power-on reset, and MWRITE generation. Jeff didn't have any documentation on it, and I've been unable to find any online, other than mentions in sales literature. I took a little time tonight to go through it, figure out the onboard functions, and get it fully operational: http://www.glitchwrks.com/2016/05/31/tei-8080-cpu Neat little board, though TEI expected you to use the extra features (power-on jump, power-on reset, and MWRITE) in an all-or-nothing fashion: jumper J1 enables or disables everything. I wanted power-on jump and power-on reset, but didn't need MWRITE since I was using a front panel with it, so the writeup includes the trace cut modification I used to disable it. There are convenient vias on either side of the cut, so you can add in socket pins for a removable jumper. The writeup also documents the function of the switches for setting the power-on jump address. As I was working on this board, I noticed that the layout of the basic CPU function (excluding the add-ons) is *very* similar to the IMSAI MPU-A. Can anyone comment on this? Thanks, Jonathan

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Old Apple & other Computers - Free
by Greg Acker 31 May '16

31 May '16

I am moving west and have more old computers than I can take with me. If anyone wants old Apple Macs , SE, Performa, etc, a IIGS, and some Commodore 64 & other stuff free, call me at 724-992-4302. I need rid of it this week and I don’t want to toss it. Please come and rescue it. Greg Acker Merce, PA

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IEEE coverage
by Evan Koblentz 31 May '16

31 May '16

Remember this online Spectrum article from VCF East last month? http://spectrum.ieee.org/tech-talk/geek-life/history/theyre-alive-vintage-c… I'm told it is in the current print edition, too. Cool!

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Wish me luck
by Connor Krukosky 31 May '16

31 May '16

I'm currently packing to drive up to Poughkeepsie today, I start at IBM tomorrow. Wish me luck! I'll try to make it to next weekend's workshop I will be in Boston all of next week for a conference so hopefully I have some down time, also maybe me and Ian can carpool :) -Connor Krukosky

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WTB: MOS6560 / VIC Chip or Parts VIC-20
by Todd George 31 May '16

31 May '16

Need a MOS6560 to replace a defective one in a VIC-20. Additionally would consider a parts/ugly VIC-20 with a 6560 that has a fighting chance of working. I can desolder and all that. I've seen the dealer on eBay and am choosing to spend my money elsewhere (in the community). Hit me up off-list if you can help. :-) -Todd

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Homebrew 8080 machine in NJ
by Mike Loewen 30 May '16

30 May '16

This might be an interesting project for someone: Ebay #322128736174 Mike Loewen mloewen(a)cpumagic.scol.pa.us Old Technology http://q7.neurotica.com/Oldtech/

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OT: cyber insurance
by Evan Koblentz 29 May '16

29 May '16

A question for my daytime job: anyone here work for a company that purchased cyber insurance? If so, then send me a private response.

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Anyone wanna go to Finland?
by Evan Koblentz 29 May '16

29 May '16

http://suomentietokonemuseo.fi/ Seems they're having an old computer fair in January.

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PC/AT power-good troubleshooting
by Richard Cini 28 May '16

28 May '16

All – I pulled my old PC/AT off the shelf to see if I could get Windows 1 running on it. It worked when shelved years ago, but it unfortunately suffered some case damage from a leaky battery. No damage to the mobo or cards thankfully. I replaced the battery with a 4-AA pack. Basically, the PC won’t come out of reset. I tested the power supply with a load tester specifically for PC power supplies and it reports power_good and all voltages look good on a meter. So far, so good. I dug out my ISA POST diagnostics card which also has a PG tester in it. This reports no_PG but I do see the reset pulse. Not sure why one would report OK and one not. I traced the PG signal from the power supply through the 82284 clock driver/ready interface chip and the PG is definitely there (transitioning L->H on power-on) and RESET is transitioning H->L. I have a spare power supply (which also tests good) and produces the same result. I have no cards installed, nor any other load on the supply (floppy and hard drives disconnected), so it purely has to be an issue with the motherboard. Any recommendations on where to go from here? Does anyone have an extra AT motherboard they would be willing to part with? Thanks! Rich -- Rich Cini http://www.classiccmp.org/cini http://www.classiccmp.org/altair32

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50 seconds in...
by william degnan 28 May '16

28 May '16

https://www.youtube.com/watch?v=j2VipiNWMWQ -- @ BillDeg: Web: vintagecomputer.net Twitter: @billdeg <https://twitter.com/billdeg> Youtube: @billdeg <https://www.youtube.com/user/billdeg> Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>

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