Funny you should mention that, because the Living Computer Museum wrote a high-quality emulator (ContrAlto) for the Alto. It's super-accurate, even emulating th

Funny you should mention that, because the Living Computer Museum wrote a high-quality emulator (ContrAlto) for the Alto. It's super-accurate, even emulating the microcode and hardware, and runs at the speed of the live machine. It includes a debugging mode that lets you examine machine state and step through machine instructions and microcode. Source: https://github.com/livingcomputermuseum/ContrAlto https://github.com/livingcomputermuseum/ContrAlto ContrAlto was very helpful while getting the real Alto running, and I also use it for developing software such as the Mandelbrot. I wrote a guide to getting started with ContrAlto: http://www.righto.com/2016/10/simulating-xerox-alto-with-contralto.html http://www.righto.com/2016/10/simulating-xerox-alto-with-con...