Oh I will. Things just got bogged down over the holidays and everything late last year. My next step is to get everything setup so I can program an EEPROM with my Arduino so I'll have a way to load a program to bootstrap the system. I'm intentionally doing things the hard way though, to maximize my learning. For example, I'm using an Arduino Uno which doesn't have enough digital output pins to represent both the address bus and the data bus for the EEPROM. So instead of just grabbing a Mega out of the parts box, I am using SIPO shift registers to setup a serial -> parallel bus so I can program the EEPROM with fewer wires from the Arduino. No, it isn't efficient, but it'll teach me to use shift registers.
One of my other "next steps" is to just breadboard that Z80 "test circuit" and see if I can get some LED's to blink. I have to get the clock stuff figured out as well...
Like you said, it's a lot of fun. :-)
