darry wrote on 2025-06-15, 18:14:

AFAIU, your current unit should be PS/2 compatible the proper passive adapter/converter.

That's great news! but now I need an adapter haha.
I don't think I have any around here, need to check.

Question: can I wreck the trackball (or computer) with the wrong adapter?

kikendo wrote on 2025-06-16, 14:24:

That's great news! but now I need an adapter haha. I don't think I have any around here, need to check. […]
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darry wrote on 2025-06-15, 18:14:

AFAIU, your current unit should be PS/2 compatible the proper passive adapter/converter.

That's great news! but now I need an adapter haha.
I don't think I have any around here, need to check.

Question: can I wreck the trackball (or computer) with the wrong adapter?

RS-232 devices are supposed to be, per the standard, quite resistant improper voltages on unexpected pins, AFAICR, though that might apply mainly to DTE ports (like the computer's COM ports), not DCE equipment like a mouse.

I will see if I still have an exoendable Logitech serial mouse with PS/2 compatibility somewhere and a compatible adapter to test.