z80-go-zx

Z80 CPU Emulator

This is a fun project I created to see how to write a CPU emulator and also to learn golang. My first computer was Sinclair ZX Spectrum 48k so I decided to go for the Z80 CPU which I am quite familiar with.

The Z80 CPU emulates documented features and also as many as possible undocumented ones.

Having working Z80 emulator, I have created simple ZX Spectrum emulator.

The goal of this project is to have some fun and learn few things, not to create perfectly working feature rich emulator. This is work in progress, although I may not be updating it on regular basis.

Testing

Initial test was done using zexdoc/zexall instruction set exerciser (both pass). These tests (e.g. COM programs) are designed to run on CP/M system and required basic bootstrapping in order to execute them using emulator (some basic BDOS functions that output the test results to screen). You can find it in exerciser folder.

You can execute tests using command line:

go run ./main.go exercise ./exerciser/exercises/zexall.com

This test is not exhaustive, but good for checking the basic CPU implementation.

Dasm

There is a very basic disassembler in the dasm folder. I used it during debugging and testing to output the actual instruction being executed.