ExROM
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The generic designation ExROM refers to cartridge boards made by Nintendo that use the Nintendo MMC5 mapper.
The following ExROM boards are known to exist:
| Board | PRG ROM | PRG RAM | CHR |
|---|---|---|---|
| EKROM | 128,256,512 KB | 8 KB | 128,256,512 KB ROM |
| ELROM | 128,256,512 KB | 128,256,512 KB ROM | |
| ETROM | 128,256,512 KB | 16 KB (2x 8KB) | 128,256,512 KB ROM |
| EWROM | 128,256,512 KB | 32 KB | 128,256,512 KB ROM |
Solder Pad Config
- MMC5 in 'CL mode' (default) : 'CL3', 'CL4', 'CL5' and 'CL6' connected, 'SL3', 'SL4', 'SL5' and 'SL6' disconnected.
- MMC5 in 'SL mode' : 'CL3', 'CL4', 'CL5' and 'CL6' disconnected, 'SL3', 'SL4', 'SL5' and 'SL6' connected.
- RAM chip with data retention (default) : 'CL2' connected, 'SL2' disconnected, with Battery, D1, R5, R6, R8 present.
- RAM chip without data retention : 'CL2' disconnected, 'SL2' connected, with Battery, D1, R5 and R6 removed.
- Second RAM chip (if present) with data retention : 'CL1' disconnected, with battery, D1 and R7, R8 present.
- Second RAM chip (if present) without data retention (default) : 'CL1' connected, 'SL1' disconnected, R7 removed.
- Sound circuitry used : R1, R2, R4, C2, C3 present, R9 present (NES-EKROM only) or R3 and C4 present (HVC-EKROM only). An American or European NES must be modified to output cartridge audio, even if the audio circuitry is implemented.
- Sound circuitry unused : R1, R2, R3, R4, R9, C2, C3 and C4 not present.
