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i suppose i'm an idiot. it has 2 resistors, not 1 as previously stated.

there is no crystal. it has one resistor, one capacitor, 2 ic's. to have a look go here: http://www.geocities.com/redhat58271/mod_bottom.html and here: http://www.geocities.com/redhat58271/mod_top.html right click and save the pictures, they should be 800x1000 and have a reasonable amount of...

I have found one of the older mod boards which might be compatible for both 20/21 units. it has only one connector on it (21 pin) but on the other side it has a place for another connector which I believe would have been the 20 pin connection. I'm going to try to track down a scanner and get a...