Michael J. Mahon wrote:
David, I think we are in agreement that this is either not a refresh adjustment or it is not a very well-designed card, or both. ;-)
Well, if that helps, the pot is marked "102T". One end is not connected; the center pin is connected to +5V; the other end goes through a 1k resistor to pin 11 of a 74121 chip, and there is a small cap (I assume 1 nF) between that pin and pin 12 of the same chip.
Guess I'll check out what a 74121 does. -- Linards Ticmanis The Master said, "The business of laying on the colors follows the preparation of the plain ground."