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From: bitting-douglas@cs.yale.edu (Douglas Bitting)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Mac II, IIci video speed
Message-ID: <1991Jun18.033326.8253@cs.yale.edu>
Date: 18 Jun 91 03:33:26 GMT
References: <1991Jun18.003913.14422@milton.u.washington.edu>
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In article <1991Jun18.003913.14422@milton.u.washington.edu> stevep@wrq.com (Steve Poole) writes:
>Second, I have simple animation application that performs a CopyBits()
>between calls to WaitNextEvent().  The II is far and away faster than the
>IIci.  I'd guess it's a factor of 3 or better.  Putting the animation
>window onto a monitor using a NuBus video card makes no difference.

My guess would be (I don't own a IIci, but I hope to in the near future) that
it doesn't matter which monitor the animation takes place on (I am assuming
that you have a monitor in the built in port and one on a card).  The reason is
that the CPU still has to fight the video circuitry for memry access to the
built in video buffer for the monitor connected to the built in port...  So,
the monitor containing the animation will slow down even though it is not
responsible for the fight over the RAM bank containing the video buffer.
therefore, your animation will go slower... see what happens if you disconnect
a monitor from the built in video altogether --- no cycles should be stolen
from the CPU due to the video circuitry.

I hope that says what I meant it to say... :-)

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Just an idea...
--Doug

-- 
Doug Bitting             | "And we know that in all things God works
PO Box 3043 Yale Station |  for the good of those who love him..."
New Haven, CT 06520      |                       --Romans 8:28
bitting@cs.yale.edu      +------------------------------------------