[GEM Development] Video mode - bitplane vs packed pixels

[Cyprian Konador]

On Tue, 6 Feb 2024 at 22:30, John Elliott  wrote:

> Michael Bernstein wrote:
> > GEMDOS was a little bit like MS DOS. Bur i am not aware, that GEMDOS
> > is used as a base for other DOS operating systems. And the BIOS and
> > XBIOS are hardware specific.
>
> As far as I know, GEMDOS doesn't share any DNA with DOS Plus, though
> they may have superficial similarities (being operating systems by
> Digital Research that implement the MSDOS 2.x API). DOS Plus is, under
> the covers, an MS-DOS emulator running on top of a multitasking CP/M-86
> kernel, while GEMDOS isn't.
>


There you can find by quick comparison GEMDOS, MS DOS 1.x/2.x and  CM/P
2.2/3.0
I see that GEMDOS shares some function with CP/M:
https://docs.google.com/spreadsheets/d/12XHJ6YHRDfvNhtnlzEINBjRRXZPKvDQgI7AI424oTws/edit?usp=sharing

If I remember correctly Digital Research had a few similar OSes in the same
time frame:
CP/M, Concurrent DOS, DOS Plus and DR DOS (a bit later).
I'm wondering about the history of GEMDOS. How it was related to mentioned
OSes and how DR chose the API function for it.

Regards
Cyprian
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