NES 2.0 Mapper 294: Difference between revisions

Revision as of 23:25, 27 October 2019

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-[[Category:Multicart mappers]][[Category:MMC3-like mappers]][[Category:Mappers with scanline IRQs]]NES 2.0 Mapper 294 is used for the ''Super Cool Boy 4-in-1'' (CB-4035) multicart. It uses an MMC3 clone with a WRAM replaced by an outer bank register.
+#Redirect [[INES Mapper 134]]
-=Registers=
-==Outer Bank Register ($6001)==
- Mask: $E003
-3210
- ---------
- .... .SOO
-       +++- Select outer 128 KiB bank (bit 0 ignored in 256 KiB mode)
-       +--- Select outer PRG/CHR bank size
-: 256 KiB
-: 128 KiB
-==Unknown registers ($6000, $6002, $6003)==
-The multicart menu writes the same values ($00 to $6000 when the menu is shown, $FF to $6002 and $00 to $6000 when a game is selected) for every game.
-==MMC3-compatible registers ($8000-$FFFF)==
- Mask: probably $E001
- $8000, $8001, $A000, $A001, $C000, $C001, $E000, $E001: As normal MMC3.
-=Notes=
-* Because the outer bank registers are connected to where WRAM would normally be, WRAM needs to be enabled via bit 7 of MMC3 register $A001 before accessing the outer bank registers.