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High Nibble Flag
From SnesLab
The High Nibble Flag (bit 2) is on the Super FX.
When clear, the value of the low 4 bits of the color register are set.
When set, the value of the high 4 bits of the color register are set.
See Also
Reference
- Table 2-8-1 on page 2-8-9 of Book II of official Super Nintendo development manual