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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