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BBF
From SnesLab
BBF is 8 bits wide, located at 223Fh on the SA-1. It is initialized to zero.
Only the most significant bit, SEL42, is used:
- When SEL42 is clear, it indicates 16 color mode (4bpp)
- When SEL42 is set, it indicates 4 color mode (2bpp)
Reference
- 4.1.32 on page 1-4-23 of Book II of the official Super Nintendo development manual