INT 7C - SK-UPPS Data Link Interface API - TRANSMIT FRAME
AX = 0006h
ES:BX -> Mbuf (see #03847)
Notes: The DLI will send LENGTH bytes found in the Mbuf's DATA area starting
at OFFSET. A complete and valid frame must be stored there. The DLI
will only copy the current node address (see AX=0003h) to the
source node field of the frame's MAC header.
On Ethernet, the DLI will always send a minimum of 60 bytes, regardless
of the value found in the LENGTH field.
This function returns immediately; the DLI will call the protocol's
Transmit Upcall (see #03848) when the frame has been sent.
The Mbuf's IN USE field will be non-zero until the DLI calls the