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The IMSAI machine ran a highly modified version of the CP/M operating system called IMDOS.
According to Chamberlain's introduction to the book, the program apparently ran on a CP/M machine; it was written in "compiled BASIC on a Z80 micro with 64K of RAM." This version, the program that allegedly wrote the book, was not released to the general public.
Digital Research had promised to deliver an 8086 version their CP/M operating system by December 1979 but missed that date.
The Z80 eventually became the most popular microcomputer family as it was used in millions of embedded devices as well as in many home computers and computers using the de facto standard CP/M operating system, such as the Osborne, Kaypro, and TRS-80 models.