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Old 09-02-18, 07:24
Dude111 Dude111 is offline
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Very interesting book........ A Ladybird book first published in 1971 and revised in 79...... The site shows the pages from both versions so you can compare the changes in diagrams and technology between 71 and 79.

Some pictures didnt render but I discovered if I clicked the box with the X on those ones,the picture then loaded.........

http://web.archive.org/web/200411140...r/default.html
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Old 09-02-18, 08:38
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Fascinating. I will save the link to read fully later. Thanks for the post.
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Old 09-02-18, 19:22
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Very interesting, thanks Dude. I managed to get all the pictures to display properly.
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Old 09-02-18, 19:36
Dude111 Dude111 is offline
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Good....Im glad they all displayed for ya Madeline
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Old 10-02-18, 01:37
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A few times, I had to click on where the image should have been (but wasn't) and it then appeared in a separate tab, but mostly they displayed right away.
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Old 10-02-18, 20:01
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Strictly speaking that isn't really a computer. The correct name for that machine is a Punch Card Tabulator but then the media christened them 'computers' simply because they computed numbers. Although they did use the same binary code of noughts and ones which were gated in a very similar fashion to that of a modern computer.

In 1971 actual computers were not available to industry in general.

As a basic single transistor has an equivalent on/off switching action to that of a simple relay, transistor switching was used in place of the mechanical relays which were used in the first electro-mechanical tabulators invented around 1900.

They were really massive calculators which could only respond to numeric information fed in by Punch Card operators and were normally used in large companies for dealing with accounts, salaries, inventories etc. anything that needed a large volume of numbers crunched quickly, but they were just number crunching machines.

As far as I recall none actually had proper micro processors as we know them today. What could be called their central processor was actually multiple circuit boards each holding banks of ICs (Integrated Circuits) the whole of which (even for even several tabulators) could now be swallowed up by one CPU. Many hundreds of thousands of those IC's are really the inner workings of a modern CPU.

For instance the ICs used in those tabulators might have a few thousand field effect transistors on each IC inner wafer where as a modern, say i7 processor, has around 750 million.

The tabulator was really a mechanical sorting and printing machine with electro-mechanical and electronic controls

https://en.wikipedia.org/wiki/Tabulating_machine

Never the less, having just read some of it, it is an interesting and amusing read and certainly takes me back.

Last edited by jak; 10-02-18 at 20:29.
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