Int 14 Fn 83  - Comm-drv V14.0 - Flush Communication Buffers               [S]

   AH = 83h
   DX = port number
   AL = subfunction
       00h flush input buffer
       01h flush output buffer
       02h flush both buffers

Return: AH bit 7 set on error
   AH bit 7 clear if successful

See Also: AH=81h"COMM-DRV",AH=84h"COMM-DRV"