Re: Going about this the hard way, Two RWTS

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

Lyrical Nanoha wrote:
> On Mon, 9 Jan 2006, Michael J. Mahon wrote:
>
> > Lyrical Nanoha wrote:
> >
> > > I've been trying to do some demuffin tricks with Castle Wolfenstein 
> > > just for practice and for some reason the method in the docs doesn't 
> > > work.  So I'm going to have to go this brute-force and really don't 
> > > know what I'm doing.
> > >
> > > OK, here's the thing.  I can use emu2 to put a binary program onto a 
> > > scratch disk image I have.  I need to figure out some way to relocate 
> > > a DOS 3.2 (!) RWTS somewhere and do a sector-by-sector copy by 
> > > reading with the native RWTS and writing with the relocated one...any 
> > > idea how I could do this?
> >
> >
> > A common way to do this does not involve relocation at all--you just
> > swap the RWTSs in memory and run them where they expected to be!
> >
> > If you swap/read track/swap/write track the swap time is quite
> > tolerable.
>
>
> I figured out how to do that, but it still leaves me with the fact that 
> I'm using DOS 3.1 and many of the memory locations are different.  I 
> even got this nonstandard DOS to read DOS 3.3 disks.

You'll need to swap the appropriate parameters, too.

This is a standard cracking trick, usually called a "swap controller"
when used in Super IOB (though it's geared to 3.3 and variants).

-michael

Music synthesis for 8-bit Apple II's!
Home page:  http://members.aol.com/MJMahon/

"The wastebasket is our most important design
tool--and it is seriously underused."