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X Index Register: Difference between revisions
From SnesLab
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=== | === References === | ||
# https://wilsonminesco.com/816myths | # https://wilsonminesco.com/816myths | ||
# 8.1.2 of [https://archive.org/details/SNESDevManual/book1/page/n182 page 3-8-4 of Book I] of the official Super Nintendo development manual | # 8.1.2 of [https://archive.org/details/SNESDevManual/book1/page/n182 page 3-8-4 of Book I] of the official Super Nintendo development manual | ||
Revision as of 00:40, 7 July 2024
The X Index Register exists on 65x processors and often holds the current index when iterating over things.
On the S-SMP it is always 8 bits wide. It is the divisor for division commands.[2]
On the 65c816, it may be 8 or 16 bits wide. Indexing may cross bank boundaries.[1]
Unlike the Y index register, the value of the stack pointer can be transferred to/from X. See TXS and TSX.
See Also
References
- https://wilsonminesco.com/816myths
- 8.1.2 of page 3-8-4 of Book I of the official Super Nintendo development manual