Re: RGB output from C64

From: Mia Magnusson <mia_at_plea.se>
Date: Sun, 10 Mar 2019 20:15:16 +0100
Message-ID: <20190310201516.00006dc3@plea.se>
Den Sun, 10 Mar 2019 12:32:28 -0500 skrev Segher Boessenkool
<segher@kernel.crashing.org>:
> On Sun, Mar 10, 2019 at 05:57:09PM +0100, groepaz@gmx.net wrote:
> > Would be interesting to see some details on how it works (i am
> > hoping for something else than plain VICII emulation... it could be
> > a nice way to make pixel perfect screenshots from a real VICII
> > eventually)
> 
> It has to be emulation, a lot of state is needed to create the picture
> that cannot be seen from anything happening on the pins (like ECM/MCM
> modes, sprite X coordinate, sprite/data priority), so all that has to
> be emulated, and you are looking at pretty much all of a VIC-II by
> then. (Well, you don't need anything for accessing memory of course,
> all that is done by the real chip and you can sniff it).

On the other hand, the S-video signal out from the VIC-II is really
enough to "know" what's going on, and it could most likely be sampled
and cleaned, and PAL/NTSC demodulated, to generate a perfect signal.

With some automatic level detection, the hardware could learn how the
signals from the VIC-II particular actually look re unwanted stripes
and similar problems. I.e. a kind of auto-lumafix.


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Received on 2019-03-10 21:00:03

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