This directory contains the basic ZipCPU simulator.
Ok, even this isn't the best simulator of the ZipCPU. While this simulator is fully functional, it only simulates the ZipCPU, encased in either the ZipSystem or the ZipBones, plus memory. This simulator doesn't handle any interactions with the flash, the serial port, the SD-card, etc. All of these interactions (and more) are available from the simulator within the ZBasic repository.
However, this simulator is very basic to the CPU's functionality. If you just want to know if the CPU works by itself, if it can properly execute the instructions given to it--even to the point of testing interrupts etc, then this simulation will work. It's just not fully functional for testing all of the other peripheral components necessary to make a CPU useful.