The author has done a superb job here. Not only does it have a cycle-exact Intel 8088 implementation (matched with disassembled microcode timings and hardware-verified) - it does the same for the CGA, where the dot clock is 3 times the CPU clock frequency... and it correctly represents the monitor's output, overscan included, which most other PC emulators have never bothered to do.<p>And those debugging tools are something else, too!