NES 2.0 Mapper 512: Difference between revisions
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{{DEFAULTSORT:512}}[[Category:MMC3-like mappers]]NES 2.0 Mapper 512 is used for 中國大亨 (Zhōngguó Dàhēng, often incorrectly rendered in Japanese as Chūgoku Taitei), a Chinese board game similar to Game of the Goose. It uses an MMC3 clone with both CHR-ROM and at least 4 KiB of CHR-RAM, 4 KiB of additional VRAM, plus 8 KiB of battery-backed WRAM at CPU $6000-&7FFF. | {{DEFAULTSORT:512}}[[Category:MMC3-like mappers]][[Category:MMC3 with CHR ROM and CHR RAM]]NES 2.0 Mapper 512 is used for 中國大亨 (Zhōngguó Dàhēng, often incorrectly rendered in Japanese as Chūgoku Taitei), a Chinese board game similar to Game of the Goose by Sachen. It uses an MMC3 clone with both CHR-ROM and at least 4 KiB of CHR-RAM, 4 KiB of additional VRAM, plus 8 KiB of battery-backed WRAM at CPU $6000-&7FFF. | ||
== Registers == | == Registers == | ||
Mask: $ | Mask: probably $E001 | ||
$8000, $8001, $A000, $A001, $C000, $C001, $E000, $E001 | $8000, $8001, $A000, $A001, $C000, $C001, $E000, $E001: As normal MMC3. | ||
Mask: unknown, but probably $C100 | Mask: unknown, but probably $C100 | ||
$4100: Set CHR and VRAM mode | $4100: Set CHR and VRAM mode | ||
| Line 11: | Line 11: | ||
3: Seemingly identical to 2 | 3: Seemingly identical to 2 | ||
The game uses four pages of cartridge VRAM for the main game board, ''plus'' the two pages of CIRAM for the status bar, for a total of six nametable pages. While the fact that cartridge VRAM and CHR-RAM cannot be enabled at the same time might suggest that the same 4 KiB of RAM are used for both purposes, such is not the case, as the game board is expected to retain its content while Chinese characters are written into CHR-RAM. | == Notes == | ||
* The game uses four pages of cartridge VRAM for the main game board, ''plus'' the two pages of CIRAM for the status bar, for a total of six nametable pages. | |||
* While the fact that cartridge VRAM and CHR-RAM cannot be enabled at the same time might suggest that the same 4 KiB of RAM are used for both purposes, such is not the case, as the game board is expected to retain its content while Chinese characters are written into CHR-RAM. | |||
* Even as the game uses WRAM at CPU $6000-$7FFF, it fails to enable it by writing $80 to $A001. Apparently, the MMC3 clone does not allow disabling WRAM. | |||
Latest revision as of 19:21, 31 December 2017
NES 2.0 Mapper 512 is used for 中國大亨 (Zhōngguó Dàhēng, often incorrectly rendered in Japanese as Chūgoku Taitei), a Chinese board game similar to Game of the Goose by Sachen. It uses an MMC3 clone with both CHR-ROM and at least 4 KiB of CHR-RAM, 4 KiB of additional VRAM, plus 8 KiB of battery-backed WRAM at CPU $6000-&7FFF.
Registers
Mask: probably $E001
$8000, $8001, $A000, $A001, $C000, $C001, $E000, $E001: As normal MMC3.
Mask: unknown, but probably $C100
$4100: Set CHR and VRAM mode
0: CHR-ROM, CIRAM with MMC3-determined mirroring
1: CHR-ROM, Cartridge VRAM
2: CHR-RAM, CIRAM with MMC3-determined mirroring
3: Seemingly identical to 2
Notes
- The game uses four pages of cartridge VRAM for the main game board, plus the two pages of CIRAM for the status bar, for a total of six nametable pages.
- While the fact that cartridge VRAM and CHR-RAM cannot be enabled at the same time might suggest that the same 4 KiB of RAM are used for both purposes, such is not the case, as the game board is expected to retain its content while Chinese characters are written into CHR-RAM.
- Even as the game uses WRAM at CPU $6000-$7FFF, it fails to enable it by writing $80 to $A001. Apparently, the MMC3 clone does not allow disabling WRAM.
