Category:TOPS-20

**TOPS-20**
	operating system by Digital Equipment Corporation
	Upload media
	Wikipedia
Instance of	operating system; proprietary software;
Language of work or name	English;
Based on	TENEX;
Developer	Digital Equipment Corporation; Daniel Murphy (software developer); Leonard Bosack (computer hardware engineer);
Platform	DECSYSTEM-20;
Software version identifier	1 (initial version, 1976); 1A (stable version, 1976); 1B (stable version, 1976); 101B (stable version, 1976); 2 (stable version, 1977); 3 (stable version, 1978); 3A (stable version, 1978); 4 (stable version, 1980); 5.0 (stable version, 1982); 5.1 (stable version, 1982); 5.2 (stable version, 1982); 4.1 (stable version, 1983); 5.3 (stable version, 1983); 5.4 (stable version, 1984); 6.0 (stable version, 1984); 6.1 (stable version, 1985); 7.0 (stable version, 1988);
Inception	January 1973 (development);
Publication date	January 1976;
	user manual URL
Authority file
	Q1481861;
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