[Coco] No pixel wasted

[tim at franklinlabs.com]

I'm curious why you chose those frequencies. Are they used to sync. with some
other timing in the design? Without seeing the design, I would agree that the
229MHz clock would be too fast. I'm actually surprised that it worked at all.
Most 133Mhz chips will run up to 200Mz or so but that overclocking is well out
of range. Unless you found a faster part. I would also be curious what part you
are using if it's spec'ed faster than 200MHz.


On September 17, 2014 at 9:26 AM "Luis Antoniosi (CoCoDemus)"
<retrocanada76 at gmail.com> wrote:
> I reduced the speed from 229Mhz to 114Mhz, the SDRAM works better now:
>
> http://imgur.com/MY0ExuW
>
> It also fixed the artifact in coco1/2 graphics screen.
>
> But for coco3 games like roboco, thexder I still get some minor flickering
> in some areas. Like it generates those video modes with a slightly
> different pixel clock ? I have a 1986 GIME only.
>
> All the other resolutions are pixel perfect: 32, 40, 80 columns, pmode 1,
> 2, 3 and 4.
>
>
>
> Luis Felipe Antoniosi
>
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