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Bank: Difference between revisions
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A '''Bank''' | A '''Bank''' in the [[65c816]]'s address space is 256 contiguous [[pages]]. This is equivalent to 64K (65,536 bytes). | ||
The first byte of a bank is always located at an address of the form $xx:0000, where xx is the bank number. | The first byte of a bank is always located at an address of the form $xx:0000, where xx is the bank number. | ||
Revision as of 00:54, 5 August 2024
A Bank in the 65c816's address space is 256 contiguous pages. This is equivalent to 64K (65,536 bytes).
The first byte of a bank is always located at an address of the form $xx:0000, where xx is the bank number. A colon is commonly used to separate bank numbers from the low 16 bits of the address. 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.