I have a PC running MS-DOS 6.22 . This computer is connected to a laptop with a nullmodem cable. Sending data via serial port with the command:
echo 55 > COM1
always give the error:
Write fault error writing device com1 Abort, Retry, Ignore, Fail?
But if i write data directly on the serial port address (with Debug.exe) or i use a linux live CD i can transmit data to the other PC, without problems.
Is this normal? What can be the problem?