Which repurpose the .PTN image slots to store the background of
frequently updated VRAM sections, like all the numbers in the HUD.
Future games would simply use the text RAM and gaiji for numbers. Which
would have worked just fine for TH01 as well (especially since all the
functions we've seen so far are aligned to the 8-pixel byte grid), but
it looks as if ZUN simply wasn't aware of gaiji during the development
of TH01.
Part of P0083, funded by Yanga.
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