INT 14h,  01h (1)        Send One Character

Sends one character to the specified serial port.

On entry:      AH         01h
AL         Character
DX         Serial port number (0 - COM1, 1 - COM2, etc.)

Returns:       AH         Line status (see Service 03h)

                                                                          

If an error occurs, bit 7 of AH will be set. SInce bit 7 is used as a
general error flag, this service is unable to identify a time-out
error. For complete diagnostic information, use Service 03h (Get
serial port status).

See also: INT 14h, 02h
See also: INT 14h, 03h

INT 14h, 01h (1) Send One Character