Resident monitor
Encyclopedia
A resident monitor was a piece of system software
System software
System software is computer software designed to operate the computer hardware and to provide a platform for running application software.The most basic types of system software are:...

 in many early computers from the 1950s to 1970s. It can be considered a primitive precursor to the operating system.

On a general-use computer using punched card
Punched card
A punched card, punch card, IBM card, or Hollerith card is a piece of stiff paper that contains digital information represented by the presence or absence of holes in predefined positions...

 input 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.

Similar very primitive system software layers were typically in use in the early days of the later minicomputers and microcomputers before they gained the power to support full operating systems.
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