INT 17 - Shamrock Software NET.24 v3.11+ - GET STATUS AND TRANSMISSION BUFFER
AX = 2403h
Return: AL = status (see AX=2400h)
CX = number of characters in receive ring buffer
DX:BX -> transmit buffer
SeeAlso: AX=2402h

See also: 172400

172403 - Shamrock Software NET.24 v3.11+ - GET STATUS AND TRANSMISSION BUFFER