ok thanks henrik., I dont have the clock freq or a logic analyzer, i do have a 20mhz scope. i dont even have a freq counter. may be in luck though, near the microprocessor on the main unit, and only a few milimeters from the cables is a 16mhz chip, so i will assume thats what is driving the microprocessor. its a intel n87c51fb1.

heres a pic of part of the main system board

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