....inside an FPGA
Actually, that was a very interesting 3rd year undergrad project: make tommy-my-first processor in an FPGA. Possibly my favourite module, despite finding it pretty hard. On reflection I don't think it could do much beyond addition and subtraction.
Impressed that they managed as little as 500w for this beast actually: wonder weather if all the LEDS came on at once it would add up to rather more.