zemu

https://github.com/jayvalentine/zemu

Zemu is a gem which allows the user to configure a Z80-based system and then launch emulation instances of that system. These instances can be interacted with programmatically, allowing the user to inspect the contents of registers and memory, step, add breakpoints, and more. The gem requires the user to install a compatible C compiler. Currently the only compatible compiler is clang. Please report any issues on the GitHub page for the gem. This is accessible under "Homepage".