Build a Sinclair ZX80 Clone

In this project we will build a Sinclair ZX80 Clone with 16KByte of RAM and a 16KByte EPROM with dual ZX80 and ZX81 ROM images which can be switched by selector links. We will use the ZX80 Minstrel PCB from Tynemouth Software for this project (
Link for ordering PCB is below:

Below are links to download the full Schematic, PCB component reference layout, info sheet detailing part suppliers, parts list, ZX80 logos and a zip file with the dual ZX80/ZX81 ROM image:

New keypads are available from
The PCB and overlays are also available from Tindie store (, alongside kits and complete built units.

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