Other than Virtua Racer, I don't think any Sega cartridges of that era had extra processing circuitry. There were some with extra control-pad ports, and I thin

Other than Virtua Racer, I don't think any Sega cartridges of that era had extra processing circuitry. There were some with extra control-pad ports, and I think one with a modem. Of course, you could count the 32X & MegaCD as a large cartridge - but that's stretching it!