INT 7C - SK-UPPS Data Link Interface API - REGISTER MULTICAST AX = 0009h BX = protocol ID (see #03849) ES:DI -> multicast address (6 bytes) Return: AX = completion code (see #03846) Notes: The broadcast address is always enabled. Set bit 9 of PCB's protocol mode field in REGISTER PROTOCOL call (AX=0007h) to receive all multicast frames. SeeAlso: AX=000Ah,AX=0014h