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From: wayne@helix.nih.gov (Wayne Rasband)
Newsgroups: comp.sys.mac.programmer
Subject: 8.24 GC Problem
Message-ID: <644@nih-csl.nih.gov>
Date: 16 Nov 90 15:57:05 GMT
Sender: news@nih-csl.nih.gov
Organization: NIH
Lines: 9

Thanks to a tip from reinoud@duteca.tudelft.nl, I have fixed the problem I 
was having doing "live video" in NIH Image when the 8.24 GC accelerator is 
enabled. It turns out that the secret to getting the  QuickDraw/QC to work 
with PixMaps on frame grabber cards is in Tech Note 275. It tells about a 
new pmVersion (baseAddr32 =4) for 32 bit (NuBus) baseAddresses, and 
explicitly mentions video grabbers! The QuickDraw/GC must require this 
information to fetch data from NuBus PixMaps.

--wayne