Reply To: MAME4ALL error message: op-code execute on mapped i/o

[Anonymous]

In case anyone else encounters this: it turns out that the error message was a bit of a red herring: the game was actually running, just incredibly slowly. So slow that it was taking around ten minutes to get past the boot sequence!

The fix was to switch from RetroArch to mame4all-pi. Now the games that were “freezing” are working great, and many of the other games that were running slowly are running full-speed.