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From: biehl@dynamo.ecn.purdue.edu (Larry L Biehl)
Newsgroups: comp.sys.mac.programmer
Subject: GWorld calls
Message-ID: <1991Jun3.135057.4734@noose.ecn.purdue.edu>
Date: 3 Jun 91 13:50:57 GMT
Sender: root@noose.ecn.purdue.edu (ECN System Management)
Distribution: usa
Organization: Purdue University Engineering Computer Network
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I have been trying to use the GWorld calls in 32-bit quickdraw for offscreen 
bitmap/pixmaps to access memory on a RastorOps accelerator card. The 
address for this memory is greater than a 24 bit address. The information 
that I have is that I need to use 'SwapMMUMode' to transfer between 24 bit
and 32 bit address mode to access memory in one of the slots. Attempting 
to do this crashes my machine. I have tried it on a IIx and a IIfx. The machine 
locks up when SwapMMUMode is called; it appears that the system 
stack overflows.

I have tried it both with and without the suggestion made in Technical 
Note 228 with no success.  Does anyone know what I am doing wrong?
 
Larry Biehl
Purdue University