Int 14 Fn 11 - Digiboard Digichannel PC/x* - Clear Transmit Buffer [S] AH = 11h DX = port number (00h-03h) (04h-43h for XAPCM232.SYS) Return: AH = status 00h successful FFh error See Also: AH=09h"Digiboard",AH=10h"Digiboard"