Expects: AH 03H
DX COMM port number (0 to 3)
Returns: AH line status see BIOS COM status codes
AL modem status
Info: Obtains the current modem status and current line status for the
specified COMM port.
See Also: INT 14H: Serial Port I/O
Asynchronous Adapter Ports
BIOS Data Area
ROM-BIOS Functions
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