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[–] glownig 0 points 1 point (+1|-0) ago  (edited ago)

NO!

First, May 28, 1988 was first shipment of DR-DOS in history. Proof;

https://en.wikipedia.org/wiki/DR-DOS

MS-DOS existed long before that. August 1981 it shipped with IBMs. Seven years earlier!

Forensic claims show register call compatibility only. Microsoft bought QDOS source code, though DRDOS was eventually 10 times better. 2020 forensic analysis sites today using modern comparison tools show no object code at all from DRDOS.

DRDOS calls were copied though. the calling conventions. Actually DRDOS copied more calls from MS-DOS than the other way around!!!

https://en.wikipedia.org/wiki/DR-DOS