Relay Computer

My journey in constructing an 8 bit relay computer from scratch ... made from of a ton of solder, wires, lights, relays, sweat, tears, swearing and money.

ALU Design: Control Unit

In the last three posts I introduced the design for the 3-to-8 Function Decoder, Zero Detect circuit and the Condition Registers. In this post I’ll...

01 Dec 2013   —  3 minute read

ALU Design: Condition Registers

This post covers the design of the ALU Condition Registers which along with the 3-to-8 Function Decoder and Zero Detect circuit (both covered in my...

30 Nov 2013   —  3 minute read

ALU Design: Zero Detect

This post covers the design of the Zero Detect circuit which along with the 3-to-8 Function Decoder (covered in my last post) and the Condition...

23 Nov 2013   —  2 minute read

ALU Design: Function Decoder

This post covers the design of a 3-to-8 Function Decoder which along with the Zero Detect circuit and Condition Registers will all go in to...

20 Nov 2013   —  2 minute read

ALU Design: 8-bit Arithmetic Unit

In the last post I introduced the design for the 1-bit Arithmetic Unit. This post covers connecting eight of these units together to make an...

17 Nov 2013   —  5 minute read

ALU Design: 1-bit Arithmetic Unit

This post covers the design of a 1-bit Arithmetic Unit that can add two input bits together (B and C) with carry in and out....

15 Nov 2013   —  3 minute read

ALU Design: 8-bit Logic Unit

In the last post I introduced the design for a 1-bit Logic Unit. This post covers the design effort to cram 8 of these on...

13 Nov 2013   —  5 minute read