Early reZet80 history - stage 5

There were so many hardware pieces to explore so I moved on:
I added an 8-digit 7-segment display and a 20-key keypad (I desperately needed an ENTER key).

I'm using 16-bit I/O now so only one 8-bit port is used per peripheral module.

The stage remains unfinished, I have to complete documentation and clean up software.

But I had to move on with the hardware.