(a) reassemble this computer and attempt to reverse engineer the code that is downloaded to it from the controller computer (the one that is missing). There is a "Computer Optical Products Inc" encoder on one of these motors. This is pretty weird, but probably a hack when one of them was underpowered. The X is a pair of servos with two belts onto the same drive wheel. The XY motions are run by some very small servo motors. This probably downloads a whole G-code or HPGL file to the internal computer (now full of dust), which has a couple of boards, the top one probably just to control the display. Externally it's run from an RS232 cable from the outer computer. Meanwhile, I have looked at the basic issue with the electronics. It's going to need a serious stripdown and cleaning now. Someone left the cover off everything and we have a thick layer of dust over everything, electronics, belts, gears, etc.
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