ATMega644 ZX81

Electronic schematic

As you can see the schematic is extremely simple and in a few minutes everything can be connected on a proto board. The circuit generates a composite PAL video signal as with the original ZX81.

Finished electronic circuit

This is how the circuit I made for testing looks like. The same circuit was used for Galaksija emulation.

In operation

Video captured directly from composite output.


m644_zx81.hex  HEX file to burn into ATMega644 microcontroller
m644_zx81bb.hex  version with black border and slightly faster emulation
   Fuses: H=0x99 L=0xE0

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