Documentation of Operating Systems and Developers

CP/M, DR-DOS

Gary A. Kildall developed for the company Intel the PL/M programming language for the Intel 8008, derived of PL/I in 1973. In the same year he developed the operating system CP/M (Control Program for Microprocessors) in PL/M. It was the first operating system for Intel based computers. The strengths of CP/M are the high portability on all sorts of hardware configurations. Base functions were programmed hardware-independently, depending on the aimed platform the special feature were only programmed additionally.

Kildall set up with his wife Dorothy McEwen the company DR Inc. (Digital Research Incorporation) in 1976. At first CP/M was designed by DR only as a pure file manager program for 8-bit x86 computer and sold by Intel. In 1976 there was a CP/M Bios for Intel 8080 computers. At this time CP/M was the dominating operating system on the market and used by the most computer manufacturers on theyre computers to. In 1981 dozens of computer machine types competed under various operating systems like CP/M in numerous variations. Additional there were proprietary operating systems and UNIX variations. This year the operating system was used approximately on 200,000 microcomputers in more than 3,000 different configurations. CP/M was used in 1985 worldwide approximately 4 million times in different versions. CP/M was renamed to DR DOS after few other releases in 1988.

CP/M was available in many different versions for numerous application purposes. Technical further advancements of processors and the trend towards multi-user systems also were included in the development. MP/M II brought additional commands, multi-user ability with programs like CONSOLE, DISKRESET, SPOOL, SHED and ATTACH. CP/M plus (CP/M 3.0) could address 1 mbyte of main memory by segmentation the memory areas, harddisk storage up to 16 mbyte was also possible. CP/M 86 managed max. 1 mbyte main memory without segmentation and stood into competition with MS DOS. CP/M 68 K was designed for 68 K RISC CPUs and not able for multi-user or multitasking.

DR-DOS website 2007	DR DOS 3.41, Digital Research, Welcome to installation	DR DOS 3.41, Select the storage drive	DR DOS 3.41, Select the country and keyboard layout
DR DOS 3.41, Search for previous DR DOS copies	DR DOS 3.41, Default installation directory	DR DOS 3.41, Search path configuration	DR DOS 3.41, Additional options
DR DOS 3.41, Current settings	DR DOS 3.41, Installation finished	DR DOS 3.41, Command line	DR DOS 3.41, Command line
DR-DOS 7.02, Caldera DR-OS installation program	DR-DOS 7.02, Release Notes	DR-DOS 7.02, End User License Agreement	DR-DOS 7.02, Name and Serial Number
DR-DOS 7.02, Select Software to install	DR-DOS 7.02, Configure DR-DOS setup	DR-DOS 7.02, Installation ready to begin	DR-DOS 7.02, Installation is complete
DR-DOS 7.02, Restart now or view boot files	DR-DOS 7.02, Command line	DR-DOS 7.02, Command line	DR-DOS 7.02, Command line
DR-DOS 7.02, NetWars game	DR-DOS 7.02, NetWars game

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