Funcionamiento de una CPU, emulación Johnny 

i dont understand, Saving a micro code creates two files. One (.mpc) file contains the micro code itself, the .nam file the Mnemonics of the instructions.

thanks for your answer, I already saved it and I have that two files but I cannot open them, there must be a problem with saving or some thing else... can you tell me step by step what should I do? I really appreciate it.

try download again: sourceforge.net/p/johnnysimulator/wiki/Home/