[Coco] Coco 3 pixel clock

Mark McDougall msmcdoug at iinet.net.au
Tue Oct 9 17:54:41 EDT 2007

Christopher Hawks wrote:

> It looks great (with my Hsync delay circuit to center 
> it), but appears to be missing about every eighth dot on the screen. If 
> I move the display horizontally, the missing dots change so I suspected 
> it is a difference in pixel clock rates. This occurs in all resolutions 
> (640, 320, and 256).

If you _really_ wanted to, you could probably implement a pixel-clock 
converter with a CPLD and some video RAM as a line buffer... there might be 
a simpler way (I'm no video guru) but that's how you'd do it inside an FPGA...


|              Mark McDougall                | "Electrical Engineers do it
|  <http://members.iinet.net.au/~msmcdoug>   |   with less resistance!"

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