Nice GRCG use! The 8 dots of its tile register, which are commonly just
set to the same color value, can of course hold an arbitrary bit
pattern for every bitplane. This allows you to get different colors for
every pixel, with still just a single VRAM write of the alpha mask to
one bitplane.
And I thought TH01 only suffered the drawbacks of PC-98 hardware, and
made so little use of its actual features that it's perhaps not even
fair to call it "a PC-98 game"…
Completes P0130, funded by Yanga.
Made truly generic by its use in both the upcoming boss collision
handling, as well as some SinGyoku pellet spawning function.
Part of P0130, funded by Yanga.
nmlgc