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Modding a NES to run Unisystem VS arcade games (13/14)
The idea
Differences between the NES and the Unisystem VS
Step 1: Deactivating the lockout chip
Step 2: Additional memory for the PPU
Step 3, Additional memory for the CPU
Step 4: ROM for the CPU (PRG-ROM)
Step 5: ROM for the PPU (CHR-ROM)
Step 6: Additional wiring due to cartridge absence
Step 7: Button for coin insertion
Step 8: Dip switches
Palette fix patch
Combining the roms
Ressources
Disclaimer
Ressources
I found these documents or websites extremely useful while doing this mod:
Documents:
NES PPU Technical reference
Deactivating the lockout chip
NES cartridge info
Links:
nesdev.parodius.com
The best site for NES information.
Schematics:
NES CPU, PPU, Memory and cartridge connector schematic.
NES input circuitry schematic.
Unisystem VS schematic
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Last update: March 07, 2011