FxROM: Difference between revisions
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[[Category:Nintendo licensed mappers]] | |||
The generic designation '''FxROM''' refers to cartridge boards made by Nintendo that use the [[MMC4|Nintendo MMC4]] mapper. | The generic designation '''FxROM''' refers to cartridge boards made by Nintendo that use the [[MMC4|Nintendo MMC4]] mapper. | ||
== Board Types == | |||
The following FxROM boards are known to exist: | The following FxROM boards are known to exist: | ||
{| | {| class="tabular" | ||
! Board || PRG ROM || PRG RAM || CHR | ! Board || PRG ROM || PRG RAM || CHR | ||
|- | |- | ||
| | |FJROM || 128 / 256 KB || 8 KB || 16 / 32 / 64 KB ROM | ||
|- | |- | ||
| | |FKROM || 128 / 256 KB || 8 KB || 128 KB ROM | ||
|} | |} | ||
| Line 18: | Line 21: | ||
* Nametable [[mirroring]]: Controlled by mapper | * Nametable [[mirroring]]: Controlled by mapper | ||
* Subject to [[bus conflict]]s: No | * Subject to [[bus conflict]]s: No | ||
== Solder Pad config == | |||
=== Battery backup === | |||
* PRG RAM with data retention : 'SL' disconnected, D1, D2, R1, R2, R3 present. | |||
* PRG RAM without data retention : 'SL' connected, D1, D2, R1, R2, R3 not present. | |||
On the FKROM board, battery backup appears to be compulsory unless there is a hidden solder pad below the MM1026 chip. | |||
== Hardware == | == Hardware == | ||
The FKROM board uses a [http://www.mitsumi.co.jp/latest/Catalog/ic/common/stop/MM1026_1245_1080_1134_e.pdf Mitsumi MM1026] chip dedicated to safe battery backup. It's the only Nintendo board to use a specific chip dedicated to safe battery backup. | |||
== See also == | == See also == | ||
*[[MMC4|Nintendo MMC4]] | *[[MMC4|Nintendo MMC4]] | ||
Latest revision as of 06:23, 7 April 2021
The generic designation FxROM refers to cartridge boards made by Nintendo that use the Nintendo MMC4 mapper.
Board Types
The following FxROM boards are known to exist:
| Board | PRG ROM | PRG RAM | CHR |
|---|---|---|---|
| FJROM | 128 / 256 KB | 8 KB | 16 / 32 / 64 KB ROM |
| FKROM | 128 / 256 KB | 8 KB | 128 KB ROM |
Overview
- PRG ROM size: up to 256 KB
- PRG ROM bank size: 16 KB
- PRG RAM: 8 KB plus optional battery
- CHR capacity: up to 128 KB ROM
- CHR bank size: 4 KB
- Nametable mirroring: Controlled by mapper
- Subject to bus conflicts: No
Solder Pad config
Battery backup
- PRG RAM with data retention : 'SL' disconnected, D1, D2, R1, R2, R3 present.
- PRG RAM without data retention : 'SL' connected, D1, D2, R1, R2, R3 not present.
On the FKROM board, battery backup appears to be compulsory unless there is a hidden solder pad below the MM1026 chip.
Hardware
The FKROM board uses a Mitsumi MM1026 chip dedicated to safe battery backup. It's the only Nintendo board to use a specific chip dedicated to safe battery backup.
