Comments on: Building an 8-Bit Computer – Now With Instructions

By: Mads Barnkob

Mads Barnkob — Sun, 15 Nov 2015 11:02:45 +0000

Good and thorough tutorial you wrote on this, the whole hand drawn explanation from the small parts and up is great 🙂

By: Cody

Cody — Wed, 03 Apr 2013 23:57:01 +0000

I have been looking over the sap-2 architecture and discovered that it has the jz instruction. I have been wondering about those kind of branch instructions for a long time. How would I add branch instructions to the computer? I know it has something to do with the two flags attached to the alu.

By: cyzen

cyzen — Fri, 11 Jan 2013 18:15:41 +0000

… add? Did you hav done it?

By: CPU-Monty

CPU-Monty — Sun, 06 Jan 2013 20:28:44 +0000

Going to attempt to build my own computer again.
I built one many years ago actually using the same book (and it essentialy worked) as you did for a reference. I am surprised it is still usefull and current.
I got bogged down on software.
I gave up when I couldn’t figure out how to program an EEPROM
Probably will buy a burner his time.
I hope to learn as much from you as possible.
I would be great if there was some way to share code.

By: Kyle

Kyle — Thu, 20 Sep 2012 03:30:46 +0000

The next time I try this I might try wire-wrapping. If done right, everything should be a lot less cluttered.

By: gbmhunter

gbmhunter — Tue, 21 Aug 2012 01:28:05 +0000

Interesting article and Instructable! This is something they should get groups to do at Uni (when studying computer science). I was thinking, if you managed to tidy up the cables (say, with cable ties) and routed them in the correct way it would expose much more of the circuitry and make the whole thing more visually appealing.

By: Danielle

Danielle — Mon, 16 Jul 2012 21:03:18 +0000

That’s awesome. I’ve been wanting to build a computer for a while now. Will start this weekend 🙂

By: Agneepath

Agneepath — Fri, 06 Jul 2012 12:18:30 +0000

Hi Kyle , I’m stalled out on microcoding my control rom at the moment and I got distracted by that 1-bit CPU concept that circulated on HAD about a month ago but I should be able to get back in gear and finish it up in the next week or so. Do you have any video of yours in action?

By: Kyle

Kyle — Tue, 08 May 2012 02:07:10 +0000

I based the design off of the SAP-1 and modified it to add functionality like the JMP command as well as the possibility for 16 OP codes instead of only 5.

By: Ken Olsen

Ken Olsen — Tue, 08 May 2012 01:31:10 +0000

Amazing work. Did you follow Malvino’s SAP-1 or build something else?