NES 2.0 Mapper 294: Difference between revisions

Latest revision as of 18:14, 2 April 2022

NES 2.0 Mapper 294 denotes the 63-1601 multicart PCB, used for the 強捧 16-in-1 (1682) multicart consisting of 2 MiB worth of UNROM games.

Mask: $C100
D~[...M PPPP]
      | ++++- PRG A20..A17
      +------ Mirroring
               0=Vertical
               1=Horizontal

@@ Line 1: / Line 1: @@
-[[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.
+{{DEFAULTSORT:294}}[[Category:Multicart mappers]][[Category:Mappers with CHR RAM]]'''NES 2.0 Mapper 294''' denotes the '''63-1601''' multicart PCB, used for the ''強捧 16-in-1 (1682)'' multicart consisting of 2 MiB worth of UNROM games.
-=Registers=
+==Outer Bank Register ($4100, write)==
-==Outer Bank Register ($6001)==
+  Mask: $C100
-  Mask: $E003
+  D~[...M PPPP]
+        | ++++- PRG A20..A17
-3210
+        +------ Mirroring
- ---------
+=Vertical
-  .... .SOO
+=Horizontal
-        +++- 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.