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{{Use dmy dates|date=July 2019|cs1-dates=y}}
{{Use list-defined references|date=July 2022}}
[[File:Overlay Programming.svg|thumb|
In a general computing sense, '''overlaying''' means "the process of transferring a [[Block (data storage)|block]] of program code or other data into [[main memory]], replacing what is already stored".<ref name="OED_2015"/> Overlaying is a [[computer programming|programming]] method that allows programs to be larger than the computer's [[main memory]].<ref name="Butterfield_1986"/> An [[embedded system]] would normally use overlays because of the limitation of [[physical memory]], which is [[internal memory]] for a [[system-on-chip]], and the lack of [[virtual memory]] facilities.
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