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H/V Counter Latch: Difference between revisions
From SnesLab
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=== References === | === References === | ||
* [https://archive.org/details/SNESDevManual/book1/page/n76 page 2-11-1 of Book I] of the official Super Nintendo development manual | * [https://archive.org/details/SNESDevManual/book1/page/n76 page 2-11-1 of Book I] of the official Super Nintendo development manual | ||
* [https://archive.org/details/SNESDevManual/book2/page/n334 page 4-2-4 of Book II], lbid | |||
* https://problemkaputt.de/fullsnes.htm#snespputimersandstatus | * https://problemkaputt.de/fullsnes.htm#snespputimersandstatus | ||
[[Category:Video]] | [[Category:Video]] | ||
Revision as of 16:56, 15 July 2023
The H/V Counter Latch (SLHV, or Software Latch Horizontal/Vertical) is a dummy read-only S-PPU1 register located at 2137h. Its sole purpose is to cause the PPU to latch the current raster beam position into OPHCT and OPVCT when it is read. The value read is open bus.
See Also
References
- page 2-11-1 of Book I of the official Super Nintendo development manual
- page 4-2-4 of Book II, lbid
- https://problemkaputt.de/fullsnes.htm#snespputimersandstatus