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BWPA
From SnesLab
BWPA is 8 bits wide on the SA-1, located at 2228h. It is initialized to FFh.
The Bit-Breakdown Diagram in the manual appears to suggest that zeros should be written to the high nybble.
All areas are write-protected on startup.
Reference
- 4.1.24 on page 1-4-17 of Book II of the official Super Nintendo development manual