Int 14 Fn 04  - Tandy 2000 - Serial - Flush Comm Buffer                    [S]

   AH = 04h
   DL = port number
   DH = protocol
       bit 0: use XON/XOFF on received data
       bit 1: use XON/XOFF when transmitting

Return: nothing
Desc:  clears the serial interface buffer

Note:  this interrupt is identical to INT 53 on the Tandy 2000

See Also: AH=00h"Tandy 2000",INT 53"Tandy 2000"