Subject: Re: [stella] Krokodile Cart prototype review From: Pete Rittwage <peter@xxxxxxxxxxxx> Date: Sat, 28 Feb 2004 09:40:46 -0500 |
The composite sync line does just what you describe here: if the voltageWeird... Can you explain "Why?" to someone like me?
level is too high, it mixes signals from the CPU into the video picture.
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
----------------------------------------------------------------------------------------------
Archives (includes files) at http://www.biglist.com/lists/stella/archives/
Unsub & more at http://www.biglist.com/lists/stella/
-- - Pete Rittwage Augusta, GA, USA SPAM Scanning Pass Key: /RITTWAGE_MBT_022704/ -
---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
Current Thread |
---|
|
<- Previous | Index | Next -> |
---|---|---|
Re: [stella] Re: mono/stereo, Adam Thornton | Thread | Re: [stella] Krokodile Cart prototy, Chris Wilkson |
[stella] Re: mono/stereo, Glenn Saunders | Date | Re: [stella] Krokodile Cart prototy, Chris Wilkson |
Month |