The 4 to 16 line / instruction decoder

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 12/22/2016 at 02:001 Comment

After the adder was finished, I then decided to keep on going and the instruction decoder was next on my hit list. Not much in the number of images except for the final result. the left and bottom edges are the input buffers and inverters using npn transistors. The rest are AND gates using only diodes. This is the last build using thumb tacks on a wood base.

The close wiring on the decoder was a real headache but like the ALU, it worked without errors. ( well, one wrong transistor got mixed in )


Yann Guidon / YGDES wrote 12/22/2016 at 22:07 point

Some people say I'm crazy.
I'll show them your work :-D

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