| IMDOS | |
|---|---|
| Developer | Digital Research / IMS Associates, Inc. |
| OS family | CP/M |
| Working state | Historical |
| Source model | Closed source |
| Available in | English |
| Supported platforms | Intel 8080 |
| License | Proprietary |
IMDOS was a modified version of theCP/Moperating system forIntel 8080 processors, used byIMS Associates, Inc. (IMS) for theirIMSAI 8080personal computer. SinceMITS would not license their operating system to other manufacturers, IMS approachedGary Kildall and paid a fixed fee of $25,000 for a non-exclusive CP/M license.[1][2][3]
IMDOS introduced interrupt-driven devices, tree-structured directories, and other advances to CP/M.
[…] The first commercial licensing ofCP/M took place in 1975 with contracts betweenDigital Systems andOmron of America for use in their intelligent terminal, and withLawrence Livermore Laboratories where CP/M was used to monitor programs in theOctopus network. Little attention was paid to CP/M for about a year. In my spare time, I worked to improve overall facilities […] By this time, CP/M had been adapted for four different controllers. […] In 1976,Glenn Ewing approached me with a problem:Imsai, Incorporated, for whom Glenn consulted, had shipped a large number of disk subsystems with a promise that an operating system would follow. I was somewhat reluctant to adapt CP/M to yet another controller, and thus the notion of a separated Basic I/O System (BIOS) evolved. In principle, the hardware dependent portions of CP/M were concentrated in the BIOS, thus allowing Glenn, or anyone else, to adapt CP/M to the Imsai equipment. Imsai was subsequently licensed to distributeCP/M version 1.3, which eventually evolved into an operating system called IMDOS. […]
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