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ARM version of MSDOS (Announce)

posted by mceric, Germany, 19.01.2024, 10:21

> > > I remember that porting FreeDOS to other
> > > processors has already been a topic many years ago [...]
>
> > DOS/NT (predecessor to DOS-C) ran atop 68k processors for a client,
> right?
> > But it was very limited. Full MS-DOS portability is harder for other
> > architectures (needing some emulation).
>
> Could you please expand on this? What is "Full
> MS-DOS portability" and why is it hard?
The summary of the 68k portability case can be found in

https://en.wikipedia.org/wiki/Pat_Villani#FreeDOS_involvement

Pat Villani had written XDOS which grew to NSS-DOS and DOS/NT:

"When one potential contractor sought to use the OS in a system equipped with Motorola 680x0 processors instead of Intel x86 processors, for which the system was designed originally and which utilize different instruction sets and memory models, Villani was able to redesign his system to become portable across a range of different compilers and target environments"

In the DOS-C reincarnation, that kernel became the basis of the FreeDOS kernel 30 years ago. There have been many changes since then and Pat Villani died in 2011, so he had to miss the latest developments for more than a decade now.

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FreeDOS / DOSEMU2 / ...

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