INT 2F - MTEZ XpressFax Hardware TSR (CLASS2) - INSTALLATION CHECK AX = C000h BX = 444Bh CX = 4A4Eh Return: AL = status 00h not installed, OK to install FFh installed BX = 646Bh CX = 6A6Eh Note: this TSR will use any free multiplex number from C0h to FFh