INT 21 - Novell NetWare - SIGNAL SEMAPHORE (OLD) AX = F220h subfn 03h CX = length of request packet in bytes DX = 0000h (no reply packet) DS:SI -> request packet (see #02285) ES:DI ignored Return: AX = status (see #02860 at INT 2F/AX=7A20h/BX=0000h) SeeAlso: AH=F2h"Novell",AX=C503h,AX=F220h/SF=02h,AX=F220h/SF=04h