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High hardware costs and relatively slow processing speeds forced developers to use resources 'efficiently'. [[Computer storage|Data storage]] formats were heavily compacted, for example. A common example is the removal of the century from dates, which eventually lead to the '[[millennium bug]]'.
Data input required intermediate processing via punched paper tape or [[punch card|card]] and separate input to computers, usually for overnight processing. Data required validation in batches. All of this was a repetitive, labour intensive task
Data storage was strictly serial on [[magnetic tape]]: the use of data storage within readily accessible memory was not cost-effective.
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