zen80 emulator UPDATE:
Published a detailed implementation status report and instruction set coverage for our Z80 emulator in Go.
https://github.com/ha1tch/zen80/blob/main/COVERAGE.md
All documented Z80 instructions work correctly. Most undocumented features implemented, with some known gaps: IXH/IXL register access, simplified I/O flags, and a few edge cases in block instructions.
The emulator runs most Z80 software perfectly - it's only software relying on obscure undocumented behaviours that might have issues.
Full instruction-by-instruction breakdown now in the repo, with every opcode mapped to its implementation function and realistic status markers.