High level overview and specs

Naz80 Homebrew overview

The idea is to keep Mk I very simple, just to get the glue logic right and be able to do some basic stuff. selected chips are largely to do with what I have in my component drawers!


  1. 16K ROM – enough space for the program, but leaving enough for other devices
  2. 16K memory – more than enough! (my Zx81 had 1K!)
  3. 1 x UART’s for serial communication instead of screen and keyboard
  4. 16x GPIO pins to control other peripherals.


4 x 2K CMOS Static Ram – HM611LP-3

2 x 8K Rom  – Intel D2764A


1 x INS8250N