INT 94 u - Media Vision PCM.COM - TIMER CONTROL
        AL = 10h
        SI = 8017h
        AH bit 7: set timer
        AH bit 6: timer active (timer turned off if clear)
        AH bits 5-0: timer number
        DX:CX = delay if AH bit 7 set (one-shot if DX bit 15 set)
Return: ???
SeeAlso: AL=08h/SI=8017h

.