That can help. Unfortunately with so many different 2600 designs out there
I'm not sure a single fix exists....it will depend on the situation. If
you are using RF, it might not matter since the picture is lousy anyway.
If you are upgrading to composite or better, then a good power supply
(including the 7805 chip in the console) will help. But the a/v mod needs
to be thought out well enough to avoid these problems. Things like Oliver's
added resistor will be needed, or extra buffers, or other more exotic things.
-Chris
On Sat, 28 Feb 2004, Pete Rittwage wrote:
> What happens if you use a heavier-duty power supply, like 1000mA?
>
>
> Chris Wilkson wrote:
>
> >>>The composite sync line does just what you describe here: if the voltage
> >>>level is too high, it mixes signals from the CPU into the video picture.
> >>>
> >>>
> >>Weird... Can you explain "Why?" to someone like me?
> >>
> >>
> >
> >Hi Thomas,
> >
> >I'm not sure what Oliver means by "voltage level is too high", but I've
> >I've explained the mechanism below.
> >
> >See my previous post for the general idea. A little more thorough here...
> >
> >Every time a digital signal switches state, it draws current from the 5v
> >power supply. The voltage will dip, sometimes significantly. Because the
> >video section uses that same power supply it is affected by the digital
> >switching noise. The video signal is basically a variable fraction of the
> >5v power supply. Any changes in the power supply voltage will be directly
> >copied to the video signal and therefore to the tv screen.
> >
> >Hope this helps!
> >
> >-Chris
> >
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>
> --
> -
> Pete Rittwage
> Augusta, GA, USA
> SPAM Scanning Pass Key: /RITTWAGE_MBT_022704/
> -
>
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