Int 14 Fn 09 - Digiboard Digichannel PC/x* - Clear Buffers [S] AH = 09h DX = port number (00h-03h) (04h-43h for XAPCM232.SYS) Return: AH = status 00h successful FFh error See Also: AH=08h"Digiboard",AH=0Ah"Digiboard",AH=10h"Digiboard"