Thank you! You are right! ttyS0 works, but there is a lot of strange bugs with mouse, after i turn on the device and start my program in dosbox. Program randomly skips some data points and writes NaN instead of data. Also dosbox wrights : Serial1: Errors occured: Framing 0, Parity 0, Overrun 6 (IF0 …

I have an old device that measures amount of oxygen in a closed chamber. It is connected to PC through COM port. Program, that display data was written for DOS, and it works perfectly in DosBox7.0 under WindowsXP. It connects to com through "serial1=directserial realport:com1" line in dosbox.conf. …