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BBF: Difference between revisions
From SnesLab
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'''BBF''' is 8 bits wide, located at 223Fh on the [[SA-1]]. It is initialized to zero. | '''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 | 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 === | === Reference === | ||
Latest revision as of 22:07, 7 July 2024
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