A 4$, 4ICs, Z80 + Atmega32A homemade computer on breadboard

Hi, this is my own "interpretation" of the retro computing theme.

This thing uses an Atmega32A with an Arduino bootoader as universal I/O subsystem, "emulating" the I/O ports seen by the Z80, and the ROM too.

And with the cost of only 4$ (buying components from ebay...) it is possible to taste some flavor of retro computing...

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Here is a short video:

https://www.youtube.com/watch?v=7eSbZ2Hu_6s

Here all the details of the whole thing: https://hackaday.io/project/19000-a-4-4ics-z80-homemade-computer-on-breadboard

Cheers.