John Dewhirst Books

A Child's Guide to the Apple Micro
A Child's Guide to the Apple Micro

By James Ryan, John Dewhirst

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An introduction to programming with BASIC on the Apple II computer with instructions for writing and inputting simple programs.

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Child's Guide to the Commodore 64
Child's Guide to the Commodore 64

By John Dewhirst

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Explains how to use the computer language BASIC to write fundamental programs for the Commodore 64 computer.

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Child's Guide to the Amstrad Micro
Child's Guide to the Amstrad Micro

By James Ryan, John Dewhirst

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Explains how to use the computer language Basic to write fundamental programs for the Amstrad microcomputer.

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A Child's Guide to the Electron Micro
A Child's Guide to the Electron Micro

By John Dewhirst

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An introduction to the Electron Microcomputer, explaining how the keyboard works, how to use it to do simple calculations, draw colored pictures, and play music, and how to design original programs.

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The Yuquot project
The Yuquot project

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What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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