INT 60 - FTP Packet Driver - BASIC FUNC - SEND PACKET
        AH = 04h
        DS:SI -> buffer
        CX = length
Return: CF set on error
            DH = error code (see AX=01FFh)
        CF clear if successful
Note:   the buffer may be modified immediately upon return from this call
SeeAlso: AH=0Bh

.