Hello, this is my first post on this forum. So please forgive me if I am posting this in the wrong place or if it has already been asked (I really tried to look, honest!)
I am trying to recreate this nullmodem experiment with Doom Shareware.
https://www.youtube.com/watch?v=nAHGD6JrENI
I hope that if I am able to do this I will be able to run a more obscure multiplayer game that only works through nullmodem.
I have tried connecting 2 computers in the same room and two instances of DOSbox on one computer. I am connecting the DOSboxes via serial one. They are able to connect just fine, but when I try to start a game through dm.exe (dooms multiplayer launcher) one of the status windows prints overrun errors and dm.exe exits. I have not tried port forwarding because I don't think I have to do that if all the DOSboxes are on the same network. I have tried adding an rxdelay of a variety of values and also setting the port to 5000, all to no avail. I have comcast internet which gave me trouble with portforwarding in the past. My IP addresses are class A which might make a difference? I am not sure what to do next. Any help would be greatly appreciated!
Attached is a picture that generally shows the troubles I've been having when I try to run a nullmodem game through two instances of DOSbox on one computer.