? Tech Details: CUDA Switch

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Joined: Oct 17 2006
Posts: 84

Hello List:

Although the questions are prompted specifically by my experience with my G4 AGP 450 Sawtooth model, a broader understanding of the CUDA would be interesting information.

What do Macs do differently when the CUDA is depressed for over 15 seconds vs. depressed for a couple of seconds?
Will the CUDA switch effects when depressed a few seconds vs. over 15 seconds vary from model to model?
Rephrased, are the G3 trayloader Imac CUDA effects vs G4 sawtooth CUDA effects vs other Mac models the same?

G4 Experience alluded to: Apparently there is a difference based on the experience I posted under Tiger on AGP 450:
Holding the CUDA switch for over 15 seconds, I was able to install Tiger.
When I had depressed the CUDA switch for only a couple of seconds, Tiger would not install for me on several attempts, however.

Thank you.

David Johansson

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David Johansson
DHJ'S LLC
1 person computer services co. in Pryor, OK.
[http://360.yahoo.com/dhjsllc]
G4 AGP 450 Sawtooth
1 Gig Ram 80G HD + Tiger
"Darkside:" Dell Inspiron 9300; 512 RAM, 60 G HD Win XP
Also Trayloader G3-333, EMac-700mhz

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Jon
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Joined: Dec 20 2003
Posts: 2804
[url]http://docs.info.apple.c

http://docs.info.apple.com/article.html?artnum=86760

The CUDA is powered by the PRAM battery if mains power isn't connected (which is supposed to removed when resetting the CUDA/PMU) so if the PRAM is bad/low/flaky then a CUDA/PMU reset may not happen as it should.

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I am not in this world to live up to other people's expectations, nor do I feel that the world must live up to mine. - Fritz Perls

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Joined: Dec 15 2004
Posts: 122
Mac PRAM, NVRAM, CUDA/PMU & B

Mac PRAM, NVRAM, CUDA/PMU & Battery Tutorial
http://www.geocities.com/texas_macman/pram.html

Cheers, Tom

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Joined: Oct 17 2006
Posts: 84
CUDA Switch (Could Ya Clean?)

Thank you Texas Mac Man! The linked info is Wonderful!

After scanning the linked info, the issue of cleaning a possibly dirty CUDA switch arose.
Can spray on contact cleaner be used effectively to clean the switch?

(Easier to verify the apparent "obvious" solution than to discover the normal operating procedure does not apply the hard way in this particular case!)

Thank you again for the link, Tom!

David

__________________

David Johansson
DHJ'S LLC
1 person computer services co. in Pryor, OK.
[http://360.yahoo.com/dhjsllc]
G4 AGP 450 Sawtooth
1 Gig Ram 80G HD + Tiger
"Darkside:" Dell Inspiron 9300; 512 RAM, 60 G HD Win XP
Also Trayloader G3-333, EMac-700mhz