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Bank Address Register: Difference between revisions
From SnesLab
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* [[PHB]] | * [[PHB]] | ||
* [[Program Bank Register]] | * [[Program Bank Register]] | ||
* [[Address Bus A]] | |||
=== References === | === References === | ||
Revision as of 18:03, 31 July 2024
Note: this page is likely inaccurate/confusing;
The Bank Address Register (also known as the bank byte) is Nintendo's name for the 8-bit register that fills in the most significant bits of a 24-bit address memory access by the 5A22. It keeps track of what bank the CPU is configured to use. It is cleared to zero on reset.
PLB, MVN, and MVP modify this register.
See Also
References
- Figure 2-21-2 on page 2-21-3 of Book I of the official Super Nintendo development manual
- section 2.5 on page 6 of 65c816 datasheet, https://westerndesigncenter.com/wdc/documentation/w65c816s.pdf