a large pile of components were delivered today. Unfortunately I have to go to work :(

Things to test/do in no specific order:

• Assemble a basic z80 circuit on a breadboard and test some basic ideas 
• Implement rest of AVR for programmer

I suspect I can do this as two separate projects then bring them together later - the only thing that actually ties them together is the busreq and busack lines to coordinate bus access. Well, that, and the fact that programming the z80 is that bit more difficult when you have to pull the ROM off a breadboard - it shouldn’t be too bad.

Random thoughts 

It might not be a bad idea for the AVR to be able to reset the CPU - though like many of my ideas it would require a set of shift registers for port expansion to actually be able to do that. I guess that’s something else to try!

• Investigate shift registers for port expansion

The code is basically a bunch of C so it shouldn’t be too hard to support both modes for testing if I wanted to.