INT 7F - Alloy NTNX, MW386 - SET ACKNOWLEDGE ISR
        AH = 14h
        CL = 01h
        DX:DI -> application FAR acknowledge service routine (see below)
Return: AL = status
            00h successful
            01h busy
            02h channel range error (not 00h-3Fh)
            03h invalid subfunction
Note:   the service routine will be called as soon as an acknowledgment arrives
SeeAlso: AH=14h/CL=00h,AH=14h/CL=04h,AH=15/CL=04h

Service routine called with:
        DS:SI -> acknowledge structure (see AH=15h/CL=04h)
Return: AL = response code
            00h application busy, network executive should call again later
            01h acknowledge accepted
        AH,DX,SI may be destroyed