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Augusto Baffa

Lecturer/Researcher @ PUC-Rio ICAD/Visionlab, Galgos, LES

Rio de Janeiro
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This user joined on 02/02/2021.

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Marcelo Dantas wrote 05/10/2021 at 00:27 point

Hi Augusto,

Thanks for following RunCPM.

Make sure to join our Discord server. Lots of good people and cool things happening there.

More details on the GitHub Readme.

Cheers,

Marcelo.

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Mitsuru Yamada wrote 05/08/2021 at 15:04 point

Thank you for liking and following my project #PERSEUS-8 homemade 6502 computer ! Now I am making a single precision BCD floating point input/output machine language program on this computer.

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agp.cooper wrote 05/08/2021 at 07:25 point

Hi Augusto, thanks for following CPU4.

The CPU4 was a "push" in the direction of a "programmable micro-code" CPU. I felt it was chip expensive without any real advantage (too many clock cycles to do anything).

That is, it is a dead end.

My 8 bit TTA Interpreter project was a better implementation of the "programmable micro-code model", but an 8 bit memory paging system resulted in a unreasonably small memory page. Even so I did manage to code a serial I/O interrupt, call/return, push/pop codes, etc. I think a 12 bit version of the TTA Interpreter may have merit platform for a demonstration computer.

I do have a single/double cycle 4 bit CPU prototype in the pipeline that I am excited about. Just some pencil drawings at the moment. 16 instructions and less than 20 SSI chips excluding RAM/ROM.

As you have noticed I am not really a fan of LSI PROM microcode systems.

Regards AlanX

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