z80 on breadboard is currently on hold. Have a few busy
weeks ahead, hopefully I'll have more time for it. I've
put it all together as best I could, and unfortunately
it doesn't do anything on power-up... so now I need to
see where I went wrong. The core components are used
from ebay, so it's possible that some are bad- I'll need
to figure out how to test them, in a week or two.