Z80 Single Board Computer

Homebrew Z80 board with 16KB ROM and 8KB RAM

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Built this when I was around 15-16 as a learning project.

Z80 CPU running at 2 Mhz

Made mostly out of junk I had lying around at the time. The display is from a clock radio, the keyboard is buttons from a scrapped VCR. I didn't have the money or anywhere I could buy components, so I remember hunting old XT motherboards for just the right 74-series logic IC and trying to desolder it without losing too many pins in the process...

I created a small monitor program so it was possible to view memory content, enter small programs and running them etc. I also ended up porting an ancient chess program originally made for the Tandy TRS80, and modifying it so it could scroll the moves on the clock radio display.

It was a huge learning experience building those boards and actually get them to run some software.
  • 1 × Z80 CPU
  • 1 × 8255 PIO
  • 1 × 27128 EPROM
  • 1 × 6264 SRAM

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Donghoon Guem wrote 01/15/2017 at 13:44 point

Can I see Command Print?

And Can I know circuit of this board?

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jaromir.sukuba wrote 02/01/2016 at 20:54 point

Nice retro. How old is this computer?

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Tobias Rathje wrote 02/01/2016 at 21:31 point

About 20 years old. I guess it was retro even when I built it :-)

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