Re: Tweaking DOS.SYSTEM from Extra-K to support other DOS 3.3 variants

["RedskullDC" <RDC@oz.org>]

Hi Moll,

> I did a quickie and it seemed not to be... at least your trick that worked 
> with Pronto and ES didn't work with ZDOS.

The breakpoint should still be at $B747.
The instruction there is a JMP $B6F0 instead of JMP $9D84.
Your DOS stub will need slight patching for ZDOS, since
I noticed it does a JMP $9D84.

> I used the 2.3 hack.  I made the hack by crossing it with two other DOS 
> variants, both called "DOS 3.4", one of which shared ZDOS 2.2's "clicking" 
> and one of which didn't.

"Clicking"?

> FDOS is one I haven't heard of, prolly because I come from the US.

http://au.geocities.com/redskulldc/SandysFDOS.zip

Has 'free sectors' in the catalog, is patched for more free sectors than
stock DOS3.3, runs a bit faster than pronto or diversi varieties.
Breakpoint is $B787 and the jump instruction is JMP $B4D3 should
you want to turn it into a fdos.system variant :)

Would be an interesting excercise to benchmark all of these for
various different operations.

> There appear to be two versions, at least; yours has a free space hack 
> while I am aware of a version that does not have it.

Thanks for the tip. I have seen mention (perhaps in this newsgroup?)
of different versions of it.

Cheers,
Red