Make sure you have 15 MB of free program memory before starting mameboy.
> I have mameboyx and a cassio e-125. when i install on casio iget an illegal
> opearation message. "Exception: 0xc0000005 Address: 0001cf08 OFatal
> Application Error" I used to have an earlier version of mameboy that worked
> fine. i went to reinstall that and i get the same error. I have the Mamemoy
> file under the program file group on the casio. what's going on here??? this
> program used to work without a hitch until i deleted it and installed the
> update. also, i have megace9.1 and that wont install.