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A comment on CP/NC – a CP/M-compatible operating system. Parent comment

Re:CP/NC – a CP/M-compatible operating system by wvenable on Tuesday December 17, 2019 @06:26PM (#21820140)
The MS-DOS Program Segment Prefix[1] exists for source compatibility with CP/M.

https://en.wikipedia.org/wiki/Program_Segment_Prefix

https://en.wikipedia.org/wiki/Zero_page_(CP/M)

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Re:CP/NC – a CP/M-compatible operating system by sedatk on Wednesday December 18, 2019 @01:27AM (#21822362)
Also, first 9 or so functions of INT 21h were directly analogous to CP/M's BDOS. DOS also used FCB similar to CP/M.
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