looking for ROM chip simulator

I remember learning in school about how ROM chips are created. They start out with a uniform grid of wires with fuses at each intersection. Then, depending on how they want the chip to compute incoming data, they blow certain fuses while keeping other fuses intact. Signals cannot pass by the blown fuses making for only certain pathways that lead to the output lines.

Does anyone know of any online ROM ship simulators? Something that lets the user manually blow the fuses and set the input and then see what kind of output results?

http://www.gnu.org/software/electric/

Not sure if you actually blow the fuses or not or if you just leave the circuits you would have blown open when you design the chip.