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REFRESH and DRAMMODE: Difference between revisions
From SnesLab
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It keeps DRAM from forgetting. | It keeps DRAM from forgetting. | ||
/'''DRAMMODE''' is the name of pin 49 on the [[S-CPU]], tied directly to ground (low). | |||
In 2010, 6502freak theorized that setting this pin high disables the refresh cycle logic and frees up CPU time. | |||
In 2013, [[nocash]] tested [[Donkey Kong Country]] with /DRAMMODE high. The game ran normally, so he hypothesized that when setting REFRESH low the game would still work too. | |||
=== References === | |||
* https://forums.nesdev.org/viewtopic.php?p=62572#p62572 | |||
[[Category:SNES Hardware]] | [[Category:SNES Hardware]] | ||
[[Category:Traces]] | [[Category:Traces]] | ||
Revision as of 19:36, 8 May 2023
The REFRESH line comes out of pin 40 of the S-CPU. It goes into:
- pin 7 of S-WRAM
- pin 33 of the Cartridge Slot
It keeps DRAM from forgetting.
/DRAMMODE is the name of pin 49 on the S-CPU, tied directly to ground (low).
In 2010, 6502freak theorized that setting this pin high disables the refresh cycle logic and frees up CPU time.
In 2013, nocash tested Donkey Kong Country with /DRAMMODE high. The game ran normally, so he hypothesized that when setting REFRESH low the game would still work too.