High Quality Content by WIKIPEDIA articles! The Cascade virus was a resident computer virus written in assembler, that was widespread in the 1980s and early 1990s. It infected COM files and had the effect of making text on the screen fall down and form a heap in the bottom of the screen. It was notable for using an encryption algorithm to avoid being detected. It first appeared on the MS-DOS system in the late 1980s. In many computer operating systems, a COM file is a type of executable file; the name is derived from the file name extension .COM. Originally, the term stood for "Command file", a text file containing commands to be issued to the operating system (similar to a DOS batch file), on many of the Digital Equipment Corporation mini and mainframe operating systems going back to the 1970s. With the introduction of microcomputers, the type of files commonly associated with the extension .com changed; in 8-bit CP/M, and later in MS-DOS and compatible DOSes, they are binary executable files by convention. Executables in the COM file format do not necessarily need to have the file name extension .COM in any but CP/M and very early versions of MS-DOS.

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