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From: jcav@ellis.uchicago.edu (john  cavallino)
Newsgroups: comp.sys.mac.hardware
Subject: Re: LC video vs. SI video... (really built-in video in general)
Keywords: video built-in
Message-ID: <1991Mar6.152908.10157@midway.uchicago.edu>
Date: 6 Mar 91 15:29:08 GMT
References: <1991Mar6.094536.125@otago.ac.nz> <1991Mar6.011546.19535@midway.uchicago.edu> <1991Mar6.043604.9943@mintaka.lcs.mit.edu>
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In article <1991Mar6.043604.9943@mintaka.lcs.mit.edu> dbert@pogo.ai.mit.edu (Douglas Siebert) writes:
>I was under the impression that you couldn't, for instance, put 256K SIMMS in
>bank A and 1M or 4M SIMMS in bank B.  Is it different for these machines?
Yes.

>Also, if you purhcased a separate video card for the si or ci which included
>on-board VRAM, would the contention problem then go away?  This would probably
I BELIEVE (not sure) that if no monitor is connected to the internal video
port, no memory is allocated to the frame buffer and the internal video
circuitry is disabled, so there would be no contention for system RAM.
On the other hand, if you use a video card then you must contend with the
10mhz bottleneck of the NuBus.  No free lunch here, sorry.

>not be worth it if you only intended to get an 8-bit card anyway, but if you
>got a 24-bit card (which the on-board video doesn't support, correct?) then
>you would have better video and faster execution, all for only a few hundred
                                 ^^^^^^ ^^^^^^^^^ -see above
>dollars.  Then I would see no real reason to purchase a ci over an si unless
>the extra slots were really important to you.  Comments?
Well, the CPU clock rate is faster, the power supply is bigger, there is room
for larger internal hard disks, the math coprocessor is built-in, there is a
cache slot,... :-)


-- 
John Cavallino                      |     EMail: jcav@midway.uchicago.edu
University of Chicago Hospitals     |    USMail: 5841 S. Maryland Ave, Box 145
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"Opinions, my boy. Just opinions"   | Telephone: 312-702-6900