[Coco] My next project: WIP

[Luis Antoniosi (CoCoDemus)]

Well i think with the de0 i have reached a dead end here. The SDRAM is too
damn slow, I have one input writing at 12Mhz(ntsc pixel clock) and and one
output reading at 25Mhz (vga pixel clock).

I would need an external SRAM dual port at 7ns to allow this!

May i should work harder trying to re-use coco sync lines and generating an
extra hsync between two h-syncs.

Or I could move toward a S-VIDEO converter as the sync would remain the
same...


Luis Felipe Antoniosi




On Sun, Aug 24, 2014 at 10:04 AM, Matthew Stock <stock at bexkat.com> wrote:

> This is great - I have a VGA framebuffer config I put together for my DE1
> board, and at some point I was intending to try using the Coco RGB inputs
> as input.  Overkill, but also has some flexibility if I completely decouple
> the input from the output.
>
> Regarding the analog RGB inputs...  I was going to try to use a set of
> simple opamp comparators, with the reference set by a voltage divider to
> slightly above the "low" value.  By having the FPGA look at the output of
> the comparator, it should be able to distinguish between the two levels w/o
> ADC.  If you try it, let me know how it works.
>   -Matt
>
>
> On Sat, Aug 23, 2014 at 10:42 AM, Luis Antoniosi (CoCoDemus) <
> retrocanada76 at gmail.com> wrote:
>
> > https://www.youtube.com/watch?v=PUhgXZwtIJU&feature=youtu.be
> >
> >
> > Luis Felipe Antoniosi
> >
> > --
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> > Coco at maltedmedia.com
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> >
>
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