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Freeze High Nibble Flag
From SnesLab
The Freeze High Nibble Flag is on the Super FX.
When clear, the value of all 8 bits in the color register are set.
When set, the high 4 bits of the color register are fixed and only the value of the low 4 bits can be set.
See Also
Reference
- page 2-8-9 of Book II of official Super Nintendo development manual