DOS for ProDOS, pt.2

[Lyrical Nanoha <LyricalNanoha@dosius.net>]

Been thinking, yeah I know it's not good for me lol

Well, I just looked over some of the DOS disassemblies on 
http://bobsc5.home.comcast.net/aal and while I haven't found enough info 
to do the deed, I've found some insight.

The disassemblies cover the following areas of DOS: $B052.$B0B5, $B35F.$BFFF

This isn't all of DOS but it does reveal that the only code that overlaps 
the ProDOS page, other than a couple initialization tweaks, is the disk 
format code.  Good.  Moving the patches down to between $BEAF and $BEFF if 
they're really necessary should suffice; and INIT can be removed from the 
vocabulary (possibly replaced by BYE).

So now the big question is, is there room to replace the File Manager and 
RWTS with ProDOS calls?  I don't think it's out of the question.

Next step:

  1. Revise DOS 3.3 to leave $BFxx free, disable INIT (possibly adding a 
BYE stub), and load as a binary program at $2000, relocating itself.

  2. Revise DOS 3.3 to use ProDOS for file reads and writes and complete 
BYE.  At this point it should still be able to RUN HELLO on its own.

  3. Revise DOS 3.3 to use ProDOS for CATALOG (using a shorthand format or 
possibly even a modified 3.3 format so that KEY-CAT will work!)

-uso.