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Overlay data
File type: System file
Files with ov4 file extension can be found as old MS-DOS overlay files. Probably somewhat old and no longer used.
File type category:
System file
Date updated: August 20, 2018
Record marked as obsolete and not updated for a long time.
The ov4 file extension is mainly related to DOS overlay files. When running in a 640K MS-DOS machine, all program code may not fit into available memory at the same time.
To overcome this memory limitation, most large programs use overlays. An overlay is a portion of the program code that shares memory for its code with other code modules. (part of program to be loaded when needed), program code for DOS.
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