Have you experimented with tracking speeds yet?

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Yep, It works, but I need to hold the thumb button. Probably because I tested it running a minimal system 6 version (380kb) from a floppy.

One of the outputs from each axis is wire-OR'd to an interrupt line, so when there's movement, it interrupts the processor which then polls the state of all 4 lines and translates that into how many pixels the mouse should move and which direction.

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Hmm, it sounds that would effect performance in games where a lot of mouse movement is required..

Sitting snugly in its holder.. :beige: De-yellowing is next!