Perhaps, the world's fastest relay computing

A project log for BrainfuckPC Relay Computer

Von-Neumann 16-bit relay computer with Brainfuck++ instruction set

Artem KashkanovArtem Kashkanov 01/28/2019 at 08:505 Comments

First program works!  In a cycle I'm doing ADD+ADA operations on 25Hz!


0: NOP

1: ADA+0xFF00 - set Address register to 0xFF00

2: ADD+1 //increment value in current memory cell

3: ADA+1 //shift current memory cell number

//repeate last two instruction 16 times, because writing inner loops in brainfuck is brainfuck enough :)

33: ADA-0xF //return AP to 0xFF00 memory cell

34: JNZ-0x21//if current cell is Not Zero, return IP to number 1 (which would be skipped due to pc arch). 

All instructions are repeated.


f4hdk wrote 01/28/2019 at 17:55 point

Excellent! Congratulations! Is it reliable at 25Hz? That's quite fast.

The sound is impressive. You feel the machine working hard.

I'm a big fan of your work. (I would have prefered to see progress on the Decatron computer, but it doesn't matter).

It's very rewarding when you integrate/assemble all parts together, and everything works like expected, like a charm. I'm sure you currently experience this feeling after several month of hard work.

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Artem Kashkanov wrote 01/29/2019 at 07:28 point


It's fully reliable on 25Hz - Maximum frequency is 40Hz, but "Hello world" application works unstable on this frequency - need to do some improvements to fix.

Yesterday I launched "Hello world!" application, written on brainfuck (code from Wikipedia) and it works perfect. And yes - when I saw "Hello world!" in console output I was happy - Hard work is done and now I just need to polish some parts and put "Done" label to this project and became working on Dekatron computer :)

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f4hdk wrote 01/29/2019 at 12:46 point

I understand, I try to work like you : I try to finish one big project before really beginning a big new project (even if I accept collecting parts and ideas for future projects).

Maybe I will come back to "homemade CPU - computer" in a few months... if yes, it would be a fully transistored CPU-computer.

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Marcel van Kervinck wrote 01/28/2019 at 09:15 point

Congratulations, that is truly mesmerising!

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Artem Kashkanov wrote 01/29/2019 at 07:22 point

thanks a lot!

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