Thursday, February 3, 2022

ZX81 ULA


The ZX81 was a nice and cheap home computer from the 80's.
It's quitte impossible to find a real ZX81 today as its price has become unrealistic.
Today, anyone can build its own ZX81 as it is easy to find clones. But, in most cases these remakes uses the real ULA chips.
Alwin Henseler has reimplemented the original ULA design in 2012, based on a Xilinx CPLD.

This implementation was exacly the missing piece of hardware I needed for my own ZX81 clone.
Because there was no PCB, I decided to make it.

So, the ZX81_ULA_PCB.zip contains all the necessary files to create your own ZX81 ULA PCB (schematics, board and gerber files are included).

To program the CPLD, please refer to the package. It contains everything you need and of course the zx81_ula.jed programming file.

Note
I deliver the original ULA implementation package from Alwin Henseler because his website does not exist anymore.


Have fun !
Buzz

 

ZX81_ULA_PCB

Package

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