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April 21, 2017 - Revised instruction card

A project log for The Cardboard Computer - IO is my name

My goal is a 4-bit CPU using recycled cardboard substrate and Diode Transistor Logic. This is an educational platform for me.

dr-cockroachDr. Cockroach 04/21/2017 at 19:382 Comments

I have found out that after several cards were constructed that the cards were too stiff and warped out of shape enough to not give me a correct read every time. I have gone back to a simple design that gives a view of what is going on with the circuit and the magnet serves as both a graphic presentation of the instruction but also serves as a grip for placing and removing the card from the reader panel. I still need to wire the rest of the panel.

The Instruction set reading left to right , top bottom

code - instruction

1 - Subtract one from the current cell value

2 - Add one to the current cell value

3 - Move pointer back one position

4 - Move pointer forward one position

5 - Begin while loop

6 - Return loop until current cell = zero

7 - Input value to current cell

8 - Output value from current cell

All cell values are set to zero at the start of a program run.

Discussions

Morning.Star wrote 04/22/2017 at 00:49 point

Computers were supposed to obsolete paper. Yeah right :-)
Why get rid of something beautiful?

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Yann Guidon / YGDES wrote 04/21/2017 at 22:18 point

THIS is just amazing. Fabulous work ! Elegant, cheap, instructive...

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