Intel 4004 Homebrew Computer

Intel 4004 single board computer running calculator program, VTL interpreter, 8080 emulator, and so on

Ryo Mukai

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Description

This is a homebrew single board computer using Intel 4004. A calculator, VTL interpreter, and 8080 emulator run on the breadboard prototype. Palo Alto Tiny BASIC worked with minor modifications. I have made PCB with 64KB of memory and have done initial operation checks. The 8080 emulator is very slow (1/500 to 1/1000 of the actual CPU speed), so I would like to tune it up a little more. All development resources including schematics, gerber files and source codes are available on the GitHub ( https://github.com/ryomuk/emu8080on4004 ).

Details

See README.md on the GitHub https://github.com/ryomuk/emu8080on4004

It is written mostly in Japanese. If necessary, please use a translation service such as DeepL (I recommend this) or Google.

Calculator (written in native 4004 assembler)

VTL interpreter (written in native 4004 assembler)

Palo Alto Tiny BASIC (running on the 8080 emulator)

Grant Searle's 8K BASIC (ported to 8080) (running on 8080 emulator)

Files

test4004_schematics.pdf Schematics (may be not the latest). The latest version will be on GitHub (https://github.com/ryomuk/emu8080on4004) Adobe Portable Document Format - 395.63 kB - 04/19/2023 at 22:47		Preview

Discussions

Dan Julio wrote 04/19/2023 at 23:29

Fantastic! A true retro-computer! Hats off for your hard-core programming efforts. And I agree with Keri. The VFD is a nice touch. Well done.

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aaaaaa wrote 04/15/2023 at 17:42

this can run fuzix system?

Are you sure? yes | no

Ryo Mukai wrote 04/16/2023 at 12:54

I don't know anything about fuzix so I'm not sure, but I think it would be difficult to run it because the only input is the TEST signal connected to UART and it is difficult to build file system.

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aaaaaa wrote 04/19/2023 at 11:44

https://github.com/EtchedPixels/FUZIX

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Ryo Mukai wrote 04/19/2023 at 22:38

It is impossible now due to lack of interrupt function.

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Keri Szafir wrote 04/14/2023 at 12:03

Lovely project! And just look at that multi-line VFD... Thing of beauty, joy for ever.

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Ryo Mukai wrote 04/16/2023 at 12:56

Thank you! I have a project focused on this VFD on GitHub.

https://github.com/ryomuk/gu3000

And movie on YouTube

https://www.youtube.com/watch?v=gbkjLUjZCEo

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