Here is a possible patch for MacX1.2 that may fix its problems
with PCI Power-Mac's.
> 1. A patch for MacX 1.2 which solves the problem I had on a 7500 under
> 7.5.2. I've applied the patch. Brilliant, problem solved.
>
> >"ross (w.r.) brown" <ross at bnr.ca> said:
>
> >Apple has acknowledged to us that MacX 1.2 does not work on the 7200 and
> >7500 (and possibly the other PCI models). The reason, we discovered
> >through our own testing, is that the new ROMs implement a new trap ($A09F)
> >which just happens to have the same index in the OS trap table that
> >_UnimplTrap has in the Toolbox trap table. This activates a dormant bug
> >in MacX 1.2's initialization logic, causing it to think that the _PMgrOp
> >trap is implemented when it actually isn't. MacX thinks it's running on a
> >PowerBook, calls the bad trap, and crashes.
> >
> >To fix the bug, here's an easy patch you can do with ResEdit: In MacX
> >1.2's 'CODE'(4) resource, offset $21F0, change "MOVEQ #00,D0" ($7000) to
> >"MOVEQ #01,D0" ($7001).
> >
> >Having got past that problem, I find that MacX 1.2 works well on a
> 7500.
I have not tried it.
Bill Pearson
--
wrp at virginia.EDU
Dept. of Biochemistry #440
U. of Virginia
Charlottesville, VA 22908
