Digital Research

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Digital Research, Inc. (aka DR or DRI; originally Intergalactic Digital Research) was the company created by Dr. Gary Kildall to market and develop his CP/M operating system and related products. It was the first large software company in the microcomputer world. Digital Research was based in Pacific Grove, California.

The company's operating systems, starting with CP/M for 8080/Z80-based microcomputers, were the de facto standard of their era, as MS-DOS and MS Windows came later. DR's product suite included the original CP/M and its various offshoots; DR-DOS which was a MS-DOS compatible version of CP/M, and MP/M, the multi-user CP/M. The first 16-bit system was CP/M-86, which was to be unsuccessful in competition with MS-DOS. There followed Concurrent CP/M, a single-user version of the multi-tasking MP/M-86 featuring "virtual consoles" from which applications could be launched to run concurrently. Successive revisions of this system, which gradually supported MS-DOS applications and the FAT filesystem, were labelled Concurrent DOS, Concurrent DOS XM and Concurrent DOS 386.

Soon after the introduction of the Intel 80286, DR introduced a radical new real-time system, initially called DOS-286 and subsequently Flex OS. This exploited the greater memory addressing capability of the new CPU to provide a more flexible multi-tasking environment. There was a small but powerful set of system APIs, each with a synchronous and an asynchronous variant. Pipes were supported, and all named resources could be aliased by setting Environment variables. This system was to enjoy enduring favour in point-of-sale systems and was adopted by the IBM 4690 OS.

Digital Research was purchased by Novell in 1991, primarily for Novell to gain access to the OS line.

DR produced a selection of programming language compilers and interpreters for their OS-supported platforms, including C, Pascal, COBOL, Forth, PL/I, PL/M, BASIC, and Logo. They also produced a microcomputer version of the GKS graphics standard (related to NAPLPS) called GSX, and later used this as the basis of their GEM GUI. Less known are their application programs, limited largely to the GSX-based DR-DRAW and a small suite of GUI programs for GEM.

CP/M-86 and DOS

When the IBM Personal Computer was being developed, DR was asked to supply a version of CP/M written for the Intel 8086 microprocessor as the standard operating system for the PC, which used the code-compatible Intel 8088 chip. DR, which had the dominant OS system of the day, was uneasy about the agreement with IBM and refused, Microsoft seized this opportunity to supply the OS in addition to other software (e.g. Basic) for the new IBM PC. When the IBM PC arrived in late 1981, it came with PC-DOS, which was developed from 86-DOS, which Microsoft acquired for this purpose. By mid-1982, it was marketed as MS-DOS for use in hardware compatible non-IBM computers. This one decision resulted in Microsoft becoming the leading name in computer software. This story is detailed from Microsoft and IBM's point of view in the PBS series Triumph of the Nerds and from Gary Kildall's friends and coworkers point of view on The Computer Chronicles.

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