#design

List of articles tagged with 'design'

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14 Jan 2019 - 6 min read

A change of approach

In my last post I touched on how the repetitive nature of making register cards has been putting me off progressing my relay computer. If you’ve followed my blog (over …

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06 Sep 2017 - 6 min read

Memory Design (Part 2 of 2)

In my last post I started the design for the computer’s memory unit which is spread over two cards. With the lower memory card design in place its now time to finish the …

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17 Jul 2017 - 3 min read

Incrementer Design

In my last post I covered the design of the 16-bit half adder which takes whatever value is currently on the address bus and increments it by one. To make this incremented …

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01 Dec 2013 - 4 min read

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 put all three of …

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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, …