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But with the way you did it you should have done the same for both.
ie. NTSC USA & NTSC Japan.
Instead of just saying USA, it makes it look like a third format, and while it is to some extent, it's not a completely different thing.
> USA + PAL = OK
> PAL + USA + OK
>
> NTSC (japan) + PAL = NO
> PAL + NTSC (japan)= NO
>
> USA + NTSC (japan)= NO
> NTSC (japan)+ USA = NO
USA is NTSC too.
PAL + USA + OK
NTSC (japan) + PAL = NO
PAL + NTSC (japan)= NO
USA + NTSC (japan)= NO
NTSC (japan)+ USA = NO
memory card however my freind says i can what do you say