After running Zsnes, DOS games get 'invalid opcode' error

chris2922 · Post by **chris2922** » Sat Mar 04, 2006 2:06 pm

Im convinced this IS Zsnes related so bear with me.

Im building myself a DOS 7.1 based games system and have included Zsnes and some games. I have also included a few DOS games, Duke Nukem 3D for example.

In my AUTOEXEC.BAT file i load the CWSDPMI.EXE file into HIGH memory as my Front End requires it. (in case its relevant).

When in DOS, i can run Duke Nukem 3D without a problem - as can i the other DOS games.

I can also run Zsnes no problem.

The problem is, if i run Zsnes and then afterwards try and run a DOS game, I get an 'invalid opcode error' which hangs the system and requires a hard reboot.

Does Zsnes have any TSR style elements that i need to unload after i run it?

Any help would be greatly appreciated.

tikbalang · Post by **tikbalang** » Sat Mar 04, 2006 3:27 pm

it must be cwsdpmi and/or your front end. i believe cwsdpmi is loaded only when needed by whatever needs it as long as it is set correctly in the PATH environment. add its location in the autoexec.bat:

set path=%path%;c:\dos

in my case, all my dos utilities, tsr's and memory extenders are in c:\dos. i have a dedicated dos machine for gaming and i have no problems with zsnes.

what is a front end and which one do you use? i'm guessing it is some kind of menu system for the games. i use file wizard's menu system.

chris2922 · Post by **chris2922** » Sat Mar 04, 2006 7:49 pm

Thank you for your help on this.
You were spot on, it was cwsdpmi - as i expected.
I was loading it high, in autoexec.bat thinking it would carry over no problem.
Setting it to its own c:\cwsdpmi\cwsdpmi.exe directory and adding it to the path stting in CONFIG.SYS seems to have fixed it.
Thanks again.

SquareHead · Post by **SquareHead** » Sun Mar 05, 2006 9:11 am

This brings back memories of the good ole days.