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Flickering with an Arduino1284p #24

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What steps will reproduce the problem?

1. Build an atmega1284p minimal system
2. Upload DemoNTSC sketch
3. See TV

What is the expected output? What do you see instead?

Using the last release (TVout_w_audio.zip) I see an occasional horizontal 
flickering.

Using the library shipped with the Video Game Shield, the last line in 
version_history is: R6 (June 2010) (Currently Beta at 5.9), I see the same kind 
of flickering but constantly. 

What version of the product are you using? On what operating system?

Arduino software version 0021 version on Linux.

Please provide any additional information below.

I had attached a picture of my TV, the flickering is the same in both cases but 
almost all the time with the R6 and occasionally with the TVout_w_audio release.


I also noticed how the pins changes from the TVout_w_audio to the R6 release 
(the ones triggered with the ENABLE_FAST_OUTPUT).

Finally, I tired to use the source from your repository but it can't complie 
the DemoNSTC sketch.

Original issue reported on code.google.com by man...@rabade.com on 24 Nov 2010 at 7:31

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