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With the concept of software copyrights in its infancy, Digital Research declined to sue IBM, and instead made a deal where IBM would provide CP/M-86 as an option for its IBM PC machines. Gary Kildall was reportedly upset that PC-DOS mimicked CP/M so closely and complained to IBM.

вЂњ.COMвЂќ files for executable command files.

Reserved filenames such as PRN: (for printer) and CON: (for console).

The wildcard character вЂњ*вЂќ and the matching character вЂњ?вЂќ.

The 8+3 file name format (for example, FILENAME.DOC).

Alphabetical drive letter names like вЂњA:,вЂќ вЂњB:,вЂќ and вЂњC.вЂќ.

HereвЂ™s a list of some similarities between CP/M and MS-DOS: While developing 86-DOS, its creator, Tim Paterson, looked heavily to CP/M for inspiration, borrowing its general architecture and command-line nature. Later, Microsoft would sell PC-DOS under its own label as Microsoft MS-DOS. Some months later, Microsoft purchased 86-DOS outright for $50,000.ДЁ6-DOS became IBM PC-DOS when it shipped with the IBM PC in August of 1981. So IBM turned to Microsoft, which licensed a product called 86-DOS from Seattle Computer Products (SCP).

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When IBM began developing its Personal Computer (the IBM PC 5150), the firm first tried to secure a license to CP/M, but Digital Research didnвЂ™t like the proposed terms of the deal. Interestingly, around that same time, a new operating system based on CP/M-MicrosoftвЂ™s MS-DOS-was rapidly gaining market share.

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In 1982, Microsoft Chairman Bill Gates claimed that SoftCard customers represented the largest single install base for CP/M machines. The 1980 Microsoft SoftCard allowed an Apple II to run CP/M. Users could plug the card into their Apple II computer to give it a Z80 CPU that could run popular CP/M productivity applications. In fact, way back in 1980, MicrosoftвЂ™s very first hardware product was the Z80 SoftCard for the Apple II. Other computers-including some lower-priced home machines-featured CP/M capability as an add-on option, although it often required extra hardware to make it possible to run. Popular CP/M computer vendors included Cromemco, Kaypro, Amstrad, Osborne, Vector Graphic, Televideo, Visual, and Zenith Data Systems. CP/M shipped as the default OS for hundreds of different computer models of all types and sizes.

VisualДЄlmost all computers using the industry-standard S100 bus that used an 8080 or Z80 were capable of running CP/M. The 1983 Visual 1050 ran an enhanced version of CP/M. Most computers running CP/M included an 8-bit Intel 8080 or a Zilog Z80 processor, although Digital Research later released a 16-bit version of CP/M for Intel 8086 machines called CP/M-86. Other programs, such as AutoCAD and Turbo Pascal, originated on CP/M, and later became more successful after being ported to MS-DOS later. Popular applications for CP/M included WordStar (a word processor), SuperCalc (a spreadsheet application), and dBase (for databases).

This meant that CP/M applications were not necessarily tied to the particular hardware they ran on and could be more easily translated between PCs from different vendors. One of CP/MвЂ™s key breakthroughs was in handling basic input and output tasks with the underlying hardware, leaving application software to interface mostly with the OS itself. When you were done, youвЂ™d either reboot the machine or exit back to the CP/M prompt. (This would copy all of the BASIC files from drive вЂњB:вЂќ over to drive вЂњA:вЂќ.) To run a program, youвЂ™d type the program name and hit enter. You performed file operations using simple commands such as вЂњPIPвЂќ (for copying files) by typing PIP A:=B:*.BAS and hitting Enter. Benj EdwardsД¬P/M was a console-based operating system, which means that you interacted with it using a keyboard, typing in commands at a prompt. CP/M and BASIC-80 running on a Kaypro II computer. Its initials stood for вЂњControl Program/MonitorвЂќ at first, but Digital Research changed it to the more friendly вЂњControl Program for MicrocomputersвЂќ later.ДЄs the price of microcomputers dropped rapidly in the mid-late 1970s, CP/M, paired with the Z80 CPU, became a de-facto standard platform that was popular among small business computers in the late 1970s and early 1980s. CP/M was a text-based operating system created by American programmer Gary Kildall of Digital Research in 1974.

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