Wednesday 18 January 2017

ntsc - Lack of color displaying composite video



I'm attempting to output video from a TMS9118 VDP to a television's composite video port. Right now the result I'm getting is grey scale (whereas the background should be green), and I have no idea why. I have compared the output from the TMS9118 comvid line to output from a DVD player on my oscilloscope, and the signals are somewhat different in quality.compared signals


The yellow signal is the dvd player. The blue signal is the VDP.


Following is what the VDP produces on the television screen:


enter image description here


The TV displays the DVD player signal perfectly. In summary, what is wrong with the signal coming out of the TMS9118 comvid line?




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