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 Post subject: ntsc video output
PostPosted: Tue Feb 14, 2012 12:21 am 
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I have read many old posts about ntsc video output from the atom. I can find nothing about it in the manual. Many people mention reading about it in the manual. has this feature been dropped? does it no longer work with the new studio compiler?
Robotshop sells a bask atom video board and has a reference manual to download. It is simply version 2.0 of the basic atom reference manual, and nothing is listed in there either.
I found the 3 example programs 2 of which are downloadable, but no information on hardware connections either.
-Stampee


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 Post subject: Re: ntsc video output
PostPosted: Tue Feb 14, 2012 6:11 pm 
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The commands are still there but we stopped supporting it in newer releases because we had very little interst in it. It is strictly a black and white display, very low res. If you want to use it there is sample code I can send you. It should still all work. We don't have NTSC tvs to test on anymore.

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 Post subject: Re: ntsc video output
PostPosted: Wed Feb 15, 2012 1:52 pm 
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Nathan: That would be great. A link to an old manual with the information in it would be nice, with the programs. I wanted it for an R2D2 robot I have. Inside is a ntsc projector shining out thru a holoport. I wanted simple games that the kids could play against R2 for our charity.
I did not want a gameboy setup plugged in because I wanted some interaction between R2 as the game starts, chirps and whistles for winning, sighs for losing, etc.
-Stampee


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 Post subject: Re: ntsc video output
PostPosted: Wed Feb 15, 2012 5:45 pm 
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Here are the links to the examples.

http://www.basicmicro.com/downloads/sample/atom/Pong.zip
http://www.basicmicro.com/downloads/sample/atom/Text.zip
http://www.basicmicro.com/downloads/sample/atom/Breakout.zip

You need a ntsc tv with a rca video jack(eg linelevel video input). You need to connect Pins P0 and P1(IIRC) together with 2 pots to the rca jack. Then you will need to adjust the pots until the signal is ok. If you have a scope you want a 1v peek to peek signal. The NTSC video signal is 0v = sync, .3v = black and 1v = white so the closer you adjust the pots to match that the clearer you picture will be.

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 Post subject: Re: ntsc video output
PostPosted: Thu Feb 16, 2012 10:30 pm 
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Nathan: Thank you. What value pots do you recommend? I dont suppose you have a shematic laying around?
-Stampee


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 Post subject: Re: ntsc video output
PostPosted: Tue Feb 21, 2012 6:11 pm 
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Its been a long time but the circuit is very simple. 10k pots are fine. Even 1k pots are fine. Use 2 of the same size because you are basically creating a voltage divider and its easier to adjust with the same size pots. You will use them as rheostats(just connect from one side to center IIRC). So you have a variable resistor comming from both I/O pins. Then adjust them so your voltage levels are 0, .3v and 1v approx. This is easiest to do with a scope but you can do it blind with an old TV that doesn't go to blue screen with a bad video signal.

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 Post subject: Re: ntsc video output
PostPosted: Fri Feb 24, 2012 5:57 pm 
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Nathan: Thank you very much.
-Stampee


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