v1.2

Emulation of the z80pack Intel 8080 core on Arduino Nano.

After adding an Adafruit FRAM module and moving 8080 memory out to this we have this machine now:

8080 CPU running with 0.14 MHz
UART for serial communication
2 KB ROM for program code @ 0000H - 07FFH
62 KB RAM for data @ 0800H - FFFFH