Category: <b>sound/speech</b>
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<pre><b>INT 1A - PCjr, Tandy 2500???, Tandy 1000SL/TL - SET UP SOUND MULTIPLEXOR</b>

	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
Note:	although documented in the 1000TL Technical Reference, the 1000TL
	  BIOS has just an IRET for this call
SeeAlso: AH=7Fh,AH=83h
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