Re: Found something interesting re MS-DOS

I can say that I would at least try it out on my machine just to see if it
works - but who knows how much effort would be required.  I'd hate for you
to spend too much time unless it benefits you directly :-)


On Tue, Feb 20, 2018 at 9:07 AM, Michał Pleban <lists@michau.name> wrote:

> Hello!
>
> smf wrote:
>
>
> > Or instead of booting MSDOS 3.3, try to get Digitals Concurrent DOS 3.2
> > / 4.11 / DOS plus running. Which can run MSDOS and CPM86 programs.
>
> Over the weekend, I made a D80 disk from DOS Plus 1.2 image and tried it
> with the machine.
>
> The boot sector loads, displays the text "Loading DOSPLUS.SYS" followed
> by a series of dots, then hangs.
>
> The debug trace of called interrupts shows that the whole DOSPLUS.SYS
> file is loaded, then apparently it tries to boot and dies somewhere in
> the process - the last interrupts called are INT 11 (get configuration
> information) and INT 13/0880 (get hard disk geometry).
>
> The good thing - the disassembly of the DOS Plus PC XIOS can be found on
> the Internet.
>
> The bad thing - I looked cursorily through the disassembly and noted
> that there is lots of I/O ports accessed, PC keyboard interrupt is
> hooked etc, and also it accesses video memory directly at B000 or B800.
> So it will not work on the CBM-II without a major rewrite (probably
> writing most parts from the scratch) - I am not sure if there is enough
> interest/demand to do that?
>
> Regards,
> Michau.
>
>
>
>
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>


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