Function 20 - MIDI interface.
Subfunction 1 - reset
Parameters:
- eax = 20 - function number
- ebx = 1 - subfunction number
Subfunction 2 - output byte
Parameters:
- eax = 20 - function number
- ebx = 2 - subfunction number
- cl = byte for output
Returned value (is the same for both subfunctions):
- eax = 0 - success
- eax = 1 - base port is not defined
Remarks: