NES 2.0 Mapper 267: Difference between revisions

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==MMC3-compatible registers==
==MMC3-compatible registers==
Mask: $E011
Mask: $E001
* $8000, $8001, $A000, $A001, $C000, $C001, $E000, $E001: As normal [[MMC3]]. Inner PRG banks are limited to 256 KiB, Inner CHR banks to 128 KiB.
* $8000, $8001, $A000, $A001, $C000, $C001, $E000, $E001: As normal [[MMC3]]. Inner PRG banks are limited to 256 KiB, Inner CHR banks to 128 KiB.



Revision as of 20:43, 31 March 2018

NES 2.0 Mapper 267 is used for the 8-in-1 JY-119 multicart. It consists of an MMC3 clone with an outer bank register at $6000.

MMC3-compatible registers

Mask: $E001

  • $8000, $8001, $A000, $A001, $C000, $C001, $E000, $E001: As normal MMC3. Inner PRG banks are limited to 256 KiB, Inner CHR banks to 128 KiB.

Outer Bank ($6000)

Mask: Unknown

7654 3210
---- ----
UUB. .BB.
||+---++-- Select 256 KiB outer PRG-ROM and 128 KiB outer CHR-ROM bank
++-------- Unknown, cleared when the menu is shown, both set once a game has been selected.

Notes

  • The initial value of this register must be $00 for the multicart menu to be shown.
  • The cart seems to run just fine when ignoring the two unknown bits.