INT 03 - Soft-ICE BACK DOOR COMMANDS
        AH = 09h
        SI = 4647h ('FG')
        DI = 4A4Dh ('JM')
        AL = function
            10h display string in Soft-ICE window
                DS:DX -> ASCIZ string to display (max 100 bytes, 0Dh OK)
            11h execute Soft-ICE command
                DS:DX -> ASCIZ command string (max 100 bytes, 0Dh OK)
            12h get breakpoint information
                Return: BH = entry number of last breakpoint set
                        BL = type of last breakpoint set
                            00h BPM (breakpoint register types)
                            01h I/O
                            02h INTerrupt
                            03h BPX (INT 03h-style breakpoint)
                            04h reserved
                            05h range
                        DH = entry number of last breakpoint to be triggered
                        DL = type of last triggered breakpoint (see above)
Program: Soft-ICE is a debugger by Nu-Mega Technologies, Inc.