If you're looking for an Alto simulator (and who isn't?), you should definitely use ContrAlto rather than Salto. I used both simulators while restoring an Alto. ContrAlto is much more reliable and provide tools for examining the Alto's internal behavior, while Salto tends to crash after a few minutes. The only drawback to ContrAlto is it is in C# and only works on Windows.

I wrote instructions on using ContrAlto here: http://www.righto.com/2016/10/simulating-xerox-alto-with-con...