Ozfer wrote:That is great work! Where did you get the sheets from to know what the holes do. Plus do you think we could remove the pal oscillator and either replace it with a ntsc one or have it on a switch so color would work in the normal mode?
t0nito wrote:there seems to be a 4MHz crystal driven by an internal oscillator within the chip itself, but there is no option between PAL and NTSC parts.
It's weird because I think it should be driven at 4.43MHz for PAL and 3.58MHz for NTSC.
Maybe that crystal isn't for video timing and the video timing is controlled from another main oscillator circuit of a higher frequency with a divider.
Users browsing this forum: No registered users and 2 guests