We've just updated MediaWiki and its underlying software. If anything doesn't look or work quite right, please mention it to us. --RanAS
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.
Reference
- 4.1.24 on page 1-4-17 of Book II of the official Super Nintendo development manual