Originally posted by Rena
Since generation 1 doesn't use a clock, you could convert it to use the MBC5 chip with very little effort. IIRC that gives you up to 4MB of ROM space.
Up to 8 MiB, actually. But you shouldn’t need it, because:
Originally posted by Keitaro
good to know, about the free space stuff. I hacked the GB Pokemon games extensively back in the day (my main focus is the GBA ones now) and I remember very much that Red had a lot of weird programming quirks, so I just assumed the free space was limited.
Space was limited in the Japanese Red and Green. They were counting bytes, and according to interviews only had enough space for Mew after removing debug stuff. The English versions, though, are doubled in size, so there are banks upon banks of free space. My (very) rough calculations show at least a quarter, and almost half, of Pokémon Red is free space.
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