Comments on: DR DOS: Revenge of CP/M https://dfarq.homeip.net/dr-dos-revenge-of-cp-m/?utm_source=rss&utm_medium=rss&utm_campaign=dr-dos-revenge-of-cp-m David L. Farquhar on technology old and new, computer security, and more Fri, 29 May 2026 11:10:06 +0000 hourly 1 By: neo https://dfarq.homeip.net/dr-dos-revenge-of-cp-m/#comment-57045 Wed, 28 May 2025 19:06:14 +0000 https://dfarq.homeip.net/?p=28306#comment-57045 did they produce a version of DR DOS that was capable of running 32-bit 386 protected mode and support more than 1mb memory

]]> By: S.M. Oliva https://dfarq.homeip.net/dr-dos-revenge-of-cp-m/#comment-57044 Wed, 28 May 2025 16:20:57 +0000 https://dfarq.homeip.net/?p=28306#comment-57044 Awhile back, I attempted to create a flowchart of the various DRI operating system releases targeting the x86 platform. Gave me a bit of a headache. You can find it here if you’re interested:

https://www.smoliva.blog/img/cc-dri.png

]]> By: Rob Urfer https://dfarq.homeip.net/dr-dos-revenge-of-cp-m/#comment-56134 Mon, 21 Feb 2022 18:08:53 +0000 https://dfarq.homeip.net/?p=28306#comment-56134 The guy who wrote the code for the operating system that became MS-DOS also wrote an operating system for Heath that was called HDOS. It was very clunky and I was soooo happy when there was a version of CP/M that was available for my computer! Before CP/M was available, Zenith bought Heath and changed the name of the operating system to ZDOS and my H-89 computer was marketed as a Z-89. When I worked on my first IBM PC, late in 1983, I could see more of a relationship between PC-DOS and HDOS than I did with CP/M.

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