Talk:VRC6
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The VRC6 documentation (currently linked from here) seems to indicate that register $B003 has quite a lot more bits than we currently know about:
- D0/D1: VRAM/VRAM Back Mode
- D2/D3: HV register
- D4: 0 = Use VRAM; 1 = Use VROM
- D5: something related to CHR ROM?
- D7: SRAM enable (1 = enable)