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In the [[home computer]] era overlays were popular because the operating system and many of the computer systems it ran on lacked virtual memory and had very little RAM by current standards: the original [[IBM PC]] had between 16K and 64K, depending on configuration. Overlays were a popular technique in [[Commodore BASIC]] to load graphics screens.<ref name="Butterfield_1986"/>
"Several [[DOS]] linkers in the 1980s supported [overlays] in a form nearly identical to that used 25 years earlier on mainframe computers."<ref name="Levine_2000"/> [[Binary file]]s containing memory overlays had de-facto standard extensions '''.OVL''' or '''.OVR''' (but also used numerical file extensions like '''.000''', '''.001''', etc. for subsequent files). This file type was used among others by [[WordStar]],<ref name="Mabett_1985"/> [[dBase]],<ref name="Sidnam-Wright-Stevens_1990"/> and the ''Enable'' DOS office automation software package from [[Enable Software, Inc.]] [[Borland]]'s [[Turbo Pascal]]<ref name="Herschel-Dieterich_2000"/><ref name="Eßer_2009"/> and the [[GFA BASIC]] compiler were able to produce .OVL files.
== See also ==
* [[Expanded memory]] (EMS)
* [[Virtual memory]]
* [[Chain loading]]
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