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The card-programmed calculators used fields on punched cards not to specify the actual operations to be performed on data, but which "microprogram" hard-coded onto the plugboard of the IBM 604 or 605 calculator machine; a set of cards produced different results when used with different plugboards. The units could be configured to retain up to ...
The first programmable calculators such as the IBM CPC used punched cards or other media for program storage. Hand-held electronic calculators store programs on magnetic strips, removable read-only memory cartridges, flash memory, or in battery-backed read/write memory.
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Since the rows were named 12, 11, 0, 1, 2, ... 9 the bottom of the card was called the Nine-edge, and the top was called the Twelve-edge. Depending on the type of card reader, either the "9-edge" or the "12-edge" was towards the card reader operator inserting the cards - but the deck of cards was always placed face down .
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CPC's distribution centre is at Preston, Lancashire, close to the M6 motorway. [3] CPC was the host of the UK's first Raspberry Pi hack day, held in Leeds in December 2012. The 24-hour event focused on programming solely using the credit card-sized computer. [4]