IMDOS

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IMDOS was a proprietary, historical operating system based on CP/M for the Intel 8080, used on the IMSAI 8080 computer. It was developed by Digital Research and IMS Associates, Inc. After MITS declined to license CP/M to other manufacturers, IMS paid $25,000 for a non-exclusive CP/M license from Gary Kildall and adapted it into IMDOS. IMDOS added features such as interrupt-driven I/O and a tree-structured directory, along with other CP/M improvements. It ran on the Intel 8080 and is now part of computing history.