So, I think I've implemented all the Z80 instructions. I say "I think" because there are definite conflicting sources of information. I've tried to make a best guess where I can.

Here are the results of running the third party tests against the emulator.

12 failing tests out of 1,250,324 I can live with for now.

What is more interesting is the 361 not implemented tests. So, the provider of the tests expects an instruction with a certain opcode... but I think I've implemented most instructions I can find documentation for.

More research required.

I also have a booting host of sorts. It starts with something that looks familiar, so might be on the correct track, but never gets to displaying the copyright message.

Will keep chipping away at it...