1423 INT 14 - Alloy MW386 v2+ - GET PORT NUMBER FROM LOGICAL PORT ID
1423 INT 14 - MultiDOS Plus - GET PORT STATUS
1423 INT 14 - PC-MOS/386 v5.01 $serial.sys v5.04 - DECLARE PORT OWNERSHIP
1423 INT 14 - HUNTER 16 - CONTROL HANDSHAKE LINES