But we're talking old IBM software. That ran on a refrigerator with discrete logic. It had lights on the front that showed every register value. Under 1MHz if I

But we're talking old IBM software. That ran on a refrigerator with discrete logic. It had lights on the front that showed every register value. Under 1MHz if I recall. An emulator could certainly beat the performance of something you could watch execute on incandescent lightbulbs.