FXB

FXB is 8 bits wide, located at 2223h on the SA-1. It is initialized to 03h.

The most significant bit is FBM. The low 3 bits are called CB0 ~ CB2.

See Also

• CXB
• DXB
• EXB
• Super MMC

Reference

• 4.1.19 on page 1-4-13 of Book II of the official Super Nintendo development manual