Groups | Search | Server Info | Login | Register

Groups > comp.sys.apple2.programmer > #82

Re: Need example of IIgs code to set BRK vector

Show all headers | View raw

Thanks Charlie, I saw that earlier.

What do the standard macros for
_GetVector
_SetVector
assemble to?

I don't have a IIgs development environment set up. Can the IIgs mini-
assembler understand those macro calls?

Sorry, I have absolutely no IIgs programming experience, so I'm pretty
much a newb. :)

On Jan 2, 10:32 pm, Charlie <charlieD...@verEYEzon.net> wrote:
> On 1/2/2012 8:55 PM, datawiz wrote:
>
>
>
>
>
>
>
>
>
> > Can anyone offer a snippet of assembly code to properly set the BRK
> > vector on the IIgs?
>
> > I'm working on fixing a couple more Apple II games that don't work on
> > the IIgs, and I've noticed a trend of BRK causing problems. In the
> > latest case, the Apple II BRK vector at FFFE/FFFF is set to point to
> > user space code and it's used extensively as a method of code
> > obfuscation by the copy protector. In previous fixes, it's been a
> > single BRK event, which can be patched to jump to the exit point. In
> > this case, BRK instructions are littered throughout the code and sent
> > to it's internal handler, so I can't patch every instance and a
> > complete rewrite is a bit daunting.
>
> > So the path of least resistance seems to be to set the IIgs BRK vector
> > to point to the same Apple II BRK vector and it should work correctly,
> > right?
>
> > I'm not a IIgs guy at all, so any assistance would be appreciated.
>
> > Thanks!
> > Rich
>
> The IIgs actually has tools to set the BRK vector.  Here is a link to
> IIgs Technote #1 which includes sample source code:
>
> http://www.1000bit.it/support/manuali/apple/technotes/iigs/tn.iigs.00...
>
> Charlie

Back to comp.sys.apple2.programmer | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

Need example of IIgs code to set BRK vector datawiz <rich.martin@gmail.com> - 2012-01-02 17:55 -0800
  Re: Need example of IIgs code to set BRK vector Charlie <charlieDOTd@verEYEzon.net> - 2012-01-02 22:32 -0500
    Re: Need example of IIgs code to set BRK vector datawiz <rich.martin@gmail.com> - 2012-01-02 20:01 -0800
      Re: Need example of IIgs code to set BRK vector Charlie <charlieDOTd@verEYEzon.net> - 2012-01-03 00:21 -0500
        Re: Need example of IIgs code to set BRK vector datawiz <rich.martin@gmail.com> - 2012-01-02 21:46 -0800
          Re: Need example of IIgs code to set BRK vector Charlie <charlieDOTd@verEYEzon.net> - 2012-01-03 15:10 -0500
            Re: Need example of IIgs code to set BRK vector datawiz <rich.martin@gmail.com> - 2012-01-03 13:56 -0800
  Re: Need example of IIgs code to set BRK vector "Anton Treuenfels" <teamtempest@yahoo.com> - 2012-01-03 20:17 -0600
    Re: Need example of IIgs code to set BRK vector datawiz <rich.martin@gmail.com> - 2012-01-04 06:55 -0800
      Re: Need example of IIgs code to set BRK vector datawiz <rich.martin@gmail.com> - 2012-01-04 07:10 -0800
        Re: Need example of IIgs code to set BRK vector magnusfalkirk <dean.phares@gmail.com> - 2012-01-04 09:05 -0800

csiph-web