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First post, by chregu

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Hello
I recently bought a Victor VPC II computer.
It's got a 20MB harddisk, 5.25" floppy drive and in theory 640K of RAM. Unfortunately there's something wrong with the RAM.
The system only sees 256K at POST. Sometimes more, but then immediately crashes with random RAM errors.
I have absolutely no documentation. I don't even know what the dip switches on the board do. There's also no information about the chipset available online.
All the RAM chips tested good, I even replaced them to be sure. At the moment I assume, that the memory controller chip is bad. Is seems that the A8 line doesn't look right.
Thanks for any help.

signal-2021-03-23-131044.jpeg
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signal-2021-03-23-131044.jpeg
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Victor VPC II Board
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Reply 1 of 3, by chregu

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Although nobody had any hint for me, I just fixed it.
The problem actually were the dip switches which lost contact over the years. So the board wasn't even looking for RAM above 256K.
I'm feeling really stupid now for checking all the RAM chips and address lines several times.
I almost gave up.

Reply 2 of 3, by Horun

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Glad you got it working ! Nice looking old XT board. I missed your first post a few days ago but probably would not have much help at the time other thana VCFED post:
http://www.vcfed.org/forum/showthread.php?250 … II-dip-settings

Good work !

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun

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