For those wanting to build custom Z80 systems, runz80 offers a unique approach: the ability to use devices provided by plugins. Users can "build" their own Z80 system by including and defining which devices (plugins) and how they are attached, with plugins for simple input/output, keyboard buffers, and even monochrome display emulation.

There are several Z80 simulators available, catering to different needs and operating systems:

"They may have just bypassed the protection mechanism, or they may have buried one or more worms/virii/malware in it. You can't tell."

: Install Klive IDE. It provides a complete, modern development environment with all the features you'd expect from a professional IDE, completely free and open source.

You can simulate the execution of your code, watching how the Z80 registers ( A , B , C , etc.) and memory locations change in real-time [1].

However, it's crucial to consider the legal and ethical implications. Cracking software violates copyright laws and can lead to legal repercussions. Moreover, it deprives developers of the benefits of investing in their tools.