i se the same application as you specified in the link & dosbox 0.63 + ser4 I fixed the local echo if there's nothing connected to port - one of my port spying hardware was the reason... but the problem isn't over ...the mbus hardware chip also generates local echo...in win95 there isn't any problem …

Hi h-a-l-9000 i have a problem using serial port and an old application for using it - mbus (i can upload it if you'd like) the problem is that the serial driver receives local echo - i have nothing connected to port and the program receives everything that i send out - can this be disabled? thanks …