Re: From the WTF File: ProDOS and DOS 3.3 peacefully cohabiting

["Michael J. Mahon" <mjmahon@aol.com>]

lyricalnanoha wrote:
> On Sat, 10 Jan 2009, David Schmenk wrote:
>
> > Why not save the global page in the high part of LC2, above the quit 
> > code? You should have enough space for that plus a little extra.  You 
> > shouldn't have to alter DOS 3.3 at all, but you could add to DOS a BYE 
> > command that restored the global page and returned to ProDOS.
>
> Is that still true for e.g., ProDOS 8 v1.9 and later, or GS/OS?  (One of 
> my tests is running The DOS Escape from GS/OS, and returning to the 
> Finder.)
>
> Also, this would have other uses: you can still access the MLI because 
> the system page is intact.  Not really valuable, but it could have its 
> uses.
>
> Perhaps what I'll try to do is replace the INIT command altogether.
>
> What I *really* want to do is rewrite the File Manager to just issue MLI 
> calls.  With this, stuff could get pretty low-level into DOS 3.3 and 
> still work on ProDOS.  (And I want to try something with The Prisoner on 
> it >:P)

There were a fair number of DOS programs/games that made calls into the
DOS RWTS.

-michael

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