Thanks! The Basic MIDI Handler has been very helpful in testing the MIDI Mate compatibility. With the clock disconnected, none of it works. With the clock connected, I can dump all MIDI events coming in with:
10 OPEN #1,13,0,"M:"
20 XIO 40,#1,0,0,"M:"
30 GET #1,A:PRINT A:GOTO 30
Output works in a similar way.
PUT#1,144:PUT #1,60:PUT #1,90 ----> Note On C5, velocity 90
PUT#1,144:PUT #1,60:PUT #1,0 ----> Note On C5, velocity 0, which is equivalent to Note Off
Next: connect my 140STE and try MIDI Maze. Luckily it is already on my desk. Just needs connecting and I need to put MIDI Maze on the Gotek.