INT 1A - PCjr - SET UP SOUND MULTIPLEXOR
AH = 80h
AL = 00h source is 8253 channel 2
01h source is cassette input
02h source is I/O channel "Audio IN"
03h source is sound generator chip
SeeAlso: AH=83h

See also: 1A7F

1A80 - PCjr - SET UP SOUND MULTIPLEXOR