Resident monitor

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A Resident monitor (1950s-1970s) was a piece of software that was an integral part of a general-use punch card computer. The resident monitor governed the machine before and after each control card was executed, loaded and interpreted each control card, and acted as a job sequencer for batch operations.

Resident monitors were replaced by the boot monitor, boot loader or BIOS, and the operating system kernel, when rewritable base instruction sets became necessary.