Function 04h (4)         Auxiliary Character Output

Outputs a character to the standard auxiliary device.

On entry:      AH         04h
DL         Character

Returns:       Nothing

                                                                         

This function outputs the character whose ASCII value is in DL to the
standard auxiliary device, which is normally the first serial port.
(At startup, PC-DOS initializes the first serial port to 2400 baud,
eight data bits, one stop bit, and no parity.)

Notes:         If the device is busy, the function waits until it
is ready. If a Ctrl-Break or Ctrl-C is detected, INT
23h is executed following output.

This function does not monitor the status of the
serial port. For greater control, use the ROM-BIOS
services (Interrupt 14h).

See also: INT 14h, 03h
See also: 40h

04h (4) Auxiliary Character Output