[lmqclcxh] Game cartridge

Among physical game media formats, the game cartridge is interesting: it can, in principle, provide arbitrary additional circuitry, a coprocessor custom designed for the game.

Is there any game or application today that would benefit from such hardware assistance?  Maybe chess, in the style of Deep Blue.

But ASIC is monstrously expensive;  FPGA, either built into the console, or available as a generic coprocessor, will usually be cheaper.

Modern game ports to accept such cartridges will probably use PCIe, maybe USB.

Currently crypto, including DRM and 2FA.