INT 1A - Tandy 2500, Tandy 1000L series - DIGITAL SOUND - INSTALLATION CHECK AX = 8100h Return: AL > 80h if supported AX = 00C4h if supported (1000SL/TL) CF set if sound chip is busy CF clear if sound chip is free Note: the value of CF is not definitive; call this function until CF is clear on return, then call AH=84h"Tandy"