I haven't tried any cartdrige games yet, Jipe, but nevermind, the problem is solved, we found a little piece of solder (is that the english name?) which was the source of all problems. Now my 8250 has a ROM from a Brazilian upgrade kit (AC88+), with boot logo and KANJI-ROM installed. Better than before, but still not complete, because of keyboard mapping.
But still I couldn't understand why the PLUSSUB2.ROM has 64 Kbytes, if the subrom only can have 32 Kb (2+).
Well, I should be able to edit ROM files, and save them using a EPROM recorder (what's the English name for a device like that?). But can I change it only using a POKE, like that? Thanks for the help, Jipe, I'll try them soon.
