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Bank
From SnesLab
A Bank on the 65c816 is 256 contiguous pages. This is equivalent to 64K (65,536 bytes).
A bank boundary occurs between byte $FFFF of one bank and byte $0000 of the next.
VRAM and ARAM are both exactly one bank.
WRAM is two banks.
The SNES can address up to 256 banks. The data bank register holds the bank number the S-CPU is configured to use. The program bank register tells the 65c816 what bank to fetch the next opcode from.