Blog Posts

List of all articles (page 10 of 11)

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30 Nov 2013 - 4 min 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 previous posts) make up the …

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23 Nov 2013 - 2 min 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 Registers (next post) make up …

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20 Nov 2013 - 2 min 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 the ALU Control Card. The Decoder …

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13 Nov 2013 - 5 min 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 to a single pad board complete with connectors, …

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11 Nov 2013 - 5 min read

ALU Design: 1-bit Logic Unit

This post covers the design of a 1-bit Logic Unit that can produce AND, OR, XOR, NOT and SHL (Shift Left) outputs from two input bits B and C. Here’s a schematic of the …

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10 Nov 2013 - 6 min read

Relay Rumination

If there’s one thing a relay computer needs a lot of it’s … erm … relays (of course) … which happens to be a bit unfortunate as relays, …

07 Nov 2013 - 1 min read

Instruction Set

In the last post I promised to reveal the planned instruction set for the computer and here it is (pdf file). This should be viewed alongside the architecture diagram which …