GBA: Mistake when describing modes 3, 4, 5
Dwedit opened this issue · 1 comments
Dwedit commented
The good news is that the PPU actually implemented this functionality by including three extra modes, these are called bitmap modes [7]:
Mode 3: Allocates a single fully-coloured (8bpp) frame.
Mode 4: Provides two frames with half the colours (4bpp) each.
Mode 5: There’re two fully-coloured frames with half the size each (160x128 pixels).
Modes 3 and 5 are 16bpp (32768 colors), not 8bpp. Mode 4 is 8bpp (256 colors), not 4bpp.
I thought the idea that a bitmap mode being restricted to only 16 colors sounded really strange.
flipacholas commented
Huh, I wonder what was I thinking back then.
Thanks!