IMDOS

IMDOS
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 the CP/M operating system for Intel 8080 processors, used by IMS Associates, Inc. (IMS) for their IMSAI 8080 personal computer. Since MITS would not license their operating system to other manufacturers, IMS approached Gary 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.

References

^ Kildall, Gary Arlen (January 1980). "The History of CP/M, The Evolution of an Industry: One Person's Viewpoint" (Vol. 5, No. 1, Number 41 ed.). Dr. Dobb's Journal of Computer Calisthenics & Orthodontia. pp. 6–7. Retrieved 2013-06-03. […] The first commercial licensing of CP/M took place in 1975 with contracts between Digital Systems and Omron of America for use in their intelligent terminal, and with Lawrence Livermore Laboratories where CP/M was used to monitor programs in the Octopus 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 distribute CP/M version 1.3, which eventually evolved into an operating system called IMDOS. […]
^ Kildall, Gary Arlen (2016-08-02) [1993]. Kildall, Scott; Kildall, Kristin (eds.). "Computer Connections: People, Places, and Events in the Evolution of the Personal Computer Industry" (Manuscript, part 1). Kildall Family. Retrieved 2016-11-17. {{cite journal}}: Cite journal requires |journal= (help)
^ Shustek, Len (2016-08-02). "In His Own Words: Gary Kildall". Remarkable People. Computer History Museum.

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[Kildall_1980_CPM-1] Kildall, Gary Arlen (January 1980). "The History of CP/M, The Evolution of an Industry: One Person's Viewpoint" (Vol. 5, No. 1, Number 41 ed.). Dr. Dobb's Journal of Computer Calisthenics & Orthodontia. pp. 6–7. Retrieved 2013-06-03. […] The first commercial licensing of CP/M took place in 1975 with contracts between Digital Systems and Omron of America for use in their intelligent terminal, and with Lawrence Livermore Laboratories where CP/M was used to monitor programs in the Octopus 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 distribute CP/M version 1.3, which eventually evolved into an operating system called IMDOS. […]

[Kildall_1993-2] Kildall, Gary Arlen (2016-08-02) [1993]. Kildall, Scott; Kildall, Kristin (eds.). "Computer Connections: People, Places, and Events in the Evolution of the Personal Computer Industry" (Manuscript, part 1). Kildall Family. Retrieved 2016-11-17. {{cite journal}}: Cite journal requires |journal= (help)

[Shustek_2016-3] Shustek, Len (2016-08-02). "In His Own Words: Gary Kildall". Remarkable People. Computer History Museum.

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v t e Disk operating systems (DOS)
API Timeline Comparison Commands Games
MS-DOS, IBM PC DOS, compatible systems	MS-DOS Multitasking MS-DOS 4.0/4.1 MS-DOS 7 IBM PC DOS DOS/V DR-DOS H-DOS Novell DOS ROM-DOS SISNE plus PTS-DOS FreeDOS
Other x86	4680 OS 4690 OS 86-DOS ADOS Concurrent CP/M-86 Concurrent DOS CP/M-86 CP/K Datapac System Manager DOS Plus K8918-OS FlexOS MP/M-86 Multiuser DOS NetWare PalmDOS Novell DOS OpenDOS PC-MOS/386 REAL/32 SB-86 SCP1700 Towns OS TurboDOS
Other platforms	AmigaDOS AMSDOS ANDOS Apple DOS Apple ProDOS Apple SOS Atari DOS Atari TOS BW-DOS Commodore DOS Concurrent DOS 68K Concurrent DOS V60 CP/M Cromemco DOS CSI-DOS DEC BATCH-11/DOS-11 DIP DOS DOS/360 DOS XL Edos EOS FLEX GEMDOS IDEDOS IMDOS iS-DOS ISIS MDOS MicroDOS MP/M MSX-DOS MyDOS NewDos/80 OS/M PTDOS RealDOS SB-80 SCP Sinclair QDOS RDOS SmartDOS SpartaDOS SpartaDOS X Technical Support SuperDOS Top-DOS TR-DOS TRSDOS TurboDOS UDOS Z-DOS Z80-RIO
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IMDOS

IMDOS

IMDOS

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IMDOS

References

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