ZX81PLUS35 ZX81 clone

The ZX14 is a much improved Sinclair ZX81 clone built with the modern materials techniques and components of 2014.

it will be fully open sourced effort (but note that the original design is still owned by Amstrad)

3D Preview

Here is a (3D rendered) preview.

Schematic

ZX14 schematic preview

the latest schematic can be found here:

File:ZX14 schematic.pdf

A preview of it can be found on the right, click on it for a larger version:

Keyboard

ZX14 keyboard preview

I have also been busy designing a solution for the keyboard. My solution is to use commercially available cheap 6x6mm buttons, which (with some effort by bending the pins a bit) can be mounted on an EuroCard sized piece of 1/10"raster perfboard, the result would like something like the picture on the right.

Here is the schematic of the keyboard: File:KB matrix schematic.pdf

I also designed a new keyboard overlay suitable for such a keyboard with the keys going through holes in the overlay. Here is a drawing showing how it would look:

Here is a correctly scaled .PDF.