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ZX81+35
====
ZX81+35 is a clone of the Sinclair ZX81, started in 2014, and finished in 2016, that uses modern (SMT) components on a small (10x10cm) PCB, it only uses commercially available parts, so no ULA, and works with the original ZX81 ROM code.
ZX81+35 is my clone of the Sinclair ZX81, started in 2014, and finished in 2016, it uses modern (SMT) components on a small (10x10cm) PCB, and only uses commercially available parts, so no ULA, and works with the original ZX81 ROM code.
Previously (five years ago I named it ZX14) but after two years working on it, I changed my mind and renamed it to first to ZX81+34 and later to ZX81+35 to clarify that my copy was first designed 34/35 years after the original
Previously (in 2014) I named it ZX14 but after two years working on it, I changed my mind and renamed it to first to ZX81+34 and later to ZX81+35 to clarify that my copy was first designed 34/35 years after the original
There are three versions of my clone, the first prototype I designed was called ZX81+34 (Rev 1.0) and was build and tested. This PCB needed many patches, for example the 5V and GND signals on the micro-USB port was inverted, and the footprint for the crystal oscillator I chose was wrong.