ExROM
From Nesdev wiki
(Redirected from ETROM)
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 | 128,256,512,1024 KB | 8 KB | 128,256,512,1024 KB ROM |
| ELROM | 128,256,512,1024 KB | 128,256,512,1024 KB ROM | |
| ETROM | 128,256,512,1024 KB | 16 KB (2x 8KB) | 128,256,512,1024 KB ROM |
| EWROM | 128,256,512,1024 KB | 32 KB | 128,256,512,1024 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.
