Try to reproduce SNES Cartridge with different variants, but with actual ROM chips.
My goal is to produce a home made cartridge for this to games in the first time :
- Final Fantasy VI with FR traductions - "Final Fantasy VI (Traduit en Français) (v3.1).smc" (HiROM + 8KB SRAM + 4MB + Batt)
- Hyper Metroid
We cannot make games that require SuperFX, SuperFX2, DSP chips, SA-1, C4, S-DD1, or SPC7110 chips.
Cf. Mouse Bite Lab.
I choose to use EEPROM relatively recent with parallel interface.
EEPROM because I want to reuse chips wen possible and I can make mistakes without drop the chip.
Now, with this constraint, a can use one oof the following EEPROM : (Non-exhaustive list)
| Size (Mbits) | Size (Mbytes) | Voltage | Read Acces Time | Device | Price |
|---|---|---|---|---|---|
| 8 Mb | 1 MB | 3v | 55 ns | S29AL008J | ~1.79 € |
| 16 Mb | 2 MB | 3v | 70 ns | SST39VF1601C | ~2.77 € |
| 16 Mb | 2 MB | 3v | 55 ns | S29AL016J | ~3.12 € |
| 32 Mb | 4 MB | 3v | 70 ns | SST39VF3201C | ~3.43 € |
| 32 Mb | 4 MB | 3v | 70 ns | S29JL032J | ~3.27 € |
| 64 Mb | 8 MB | 3v | 90 ns | SST38VF6401 | ~7.58 € |
| 64 Mb | 8 MB | 3v | 70 ns | S29GL064S | ~3.57 € |
| 128 Mb | 16 MB | 3v | 90 ns | S29GL128S | ~4.58 € |
| 256 Mb | 32 MB | 3v | 90 ns | S29GL256S | ? |
| 512 Mb | 64 MB | 3v | 100 ns | S29GL512S | ~8.18 € |
| 1 Gb | 128 MB | 3v | 100 ns | S29GL01GS | ? |
The maximum alocatable adresse space is 00:0000 to FF:FFFFF corresponding to 128Mb (16MB) ROM size (only for unique game in cartridge and without mapping).
Voltage adapter 8 bits : 74LVC245 (Exemple SN74LVCC3245A) - Around 10ns of time response (~1.2 €)
Starndard : AS6C6264 (Warn : 3.3v typique, but OK with 5V)
I choose F-RAM to replace SRAM. I don't need Batterie with F-RAM.
Exemples :
- FM16W08 (64Kb / 8KB)
- FM18W08 (256Kb / 32KB)
Memory MAP SNES Memory MAP. SNES Memory MAP. SNES Hardware specs. SNES Memory MAP.