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BBF: Difference between revisions

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'''BBF''' is 8 bits wide, located at 223Fh.  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:
 
* 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