March 1981 - March 2001: 20 years SINCLAIR ZX81
This is a photo of ZX81 pcb issue 3. The assembly instructions show
informations about issue 1.
In the nick of time discovered: USB, VGA and SCSI since 20 years with ZX81!
Links to original ZX81 sources.
Do you know more sources? Please support my work and send an email.
![](../gif_jpg/"kerze2.gif"){kind=small}