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Freeze High Nibble Flag

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The Freeze High Nibble Flag (bit 3) 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

Table 2-8-1 on page 2-8-9 of Book II of official Super Nintendo development manual
8.1.4.4 on https://archive.org/details/SNESDevManual/book2/page/n151

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