I’m getting the following error for certain ROMs (e.g. galaga and it’s various flavours) in MAME4ALL:
CPU 0 PC 00x: warning - op-code execute on mapped i/o
The game freezes during the boot sequence, and when I force quit using control-c the terminal is filled with these errors (with the number after PC changing). Searching for the error message doesn’t seem to bring up anything relevant (other than the MAME4ALL source code!). Anybody have any idea why it’s happening, and how I could fix it?