It’s hard to say what the purpose of this project is. I just started with a bare bones ZX81 board and just kept building. I guess if these is any goal it would be:

“Starting with a real ZX81 motherboard, how much can I keep

adding to it, modifying it, and improving on it, without breaking it.”

...not much of a philosophy really, but it’s still fun. I actually find the computer grows with a life of it’s own with no concern to logic. If I see something that looks interesting, I try to add it into the mix. I keep wanting to mount everything in a nice case, but every time I try, it just keeps getting bigger.

1. •Full travel keyboard.
   

2. •32k onboard RAM upgrade.
   

3. •Composite video.
   

4. •Multi ROM switcher to switch between various versions of Basic, Forth and Assembler.
   

5. •Jarek Adamski’s ZX1541 CBM 1541 drive interface (1541 drive not shown).
   

6. •Zebra joystick adaptor + Atari Joystick added.
   

7. •Maplin Talk-Back and Maplin I/O card added. See manuals here.
   

8. •µIEC (1541 SD card drive replacement) purchased. Works well with ZX1541.
   

Stay tuned...

neoncluster.com