The IBM RT mouse I have (Part No. OOF2383) is
definitly a protocol mouse,
as it has a HD63A01XOF processor for two encoders and two buttons
(
http://electrickery.xs4all.nl/tmp/rt_mouse.JPG).
VERY interesting info:
http://74.125.93.132/search?q=cache:http://www.cs.utk.edu/~moore/hacks/02/i…
Resume: The RT keyboard has the same protocol of a PS/2 keyboard. I'd
try to follow his instructions and connect a PS/2 mouse to the beast.
Unfortunately I don't have a RT to test.