First post, by vgeorgiev
Rank
Newbie
Hello,
I got the main board on the picture. However Y2 oscillator (bottom right) is missing. I wonder is what is the value of the osc.
Reply 1 of 3, by Horun
Rank
l33t++
- Rank
- l33t++
Have not had time to track down the exact board BUT In your picture the 66.6667Mhz black rectangle (in red highlight below) should be the main CPU/BUS crystal. That would support a 33Mhz CPU. The Y2 missing crystal is for Async operation of the Math-co (goes in the W 3167 socket). The green highlights are where I see green corrosion on a quck inspection, see your posted picture, mine is shrunk and just for reference....
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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
Reply 2 of 3, by majestyk
Rank
Oldbie
- Rank
- Oldbie
It´s a "Modula Tech" mainboard.
Reply 3 of 3, by vgeorgiev
Rank
Newbie
I treated the corrosion with some vinegar. I put the CPU. It is 486DLC which is pin to pin compatible to 386 😀
The mainboard works.
https://www.youtube.com/watch?v=RPdYothcqGw
Still couldn't find any info about the board.