INT 14 - IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911./Yale EBIOS SERIAL I/O - INSTALLATION CHECK AX = F4FFh DX = port (00h-03h) Return: CF clear if present AX = 0000h CF set if not present AX <> 0000h SeeAlso: AH=36h"ComShare",AH=F9h,AH=FCh