Re: IIgs video modes...

["jsnospam@cimmeri.com" <js@cimmeri.com>]

On Feb 27, 7:05 pm, demp...@actrix.gen.nz (David Empson) wrote:
> The video timing must be kept in sync with 28M, so it wouldn't make
> sense to have another 16M clock input just for SHR mode. All the timings for SHR mode must be derived from 28M.
...
> This seems a little unlikely: it would result in odd and even columns of
> pixels in 640 mode having different widths, but they might be able to
> gloss over this due to the coarse horizontal resolution of the monitor,
> together with dithering effects.

Interesting.  Well, how this all came about is Michael and I are
trying to figure out why I'm seeing the RGB vid signal going to zero
between pixels in the 640 mode only.  All other modes are
continuous.   Due to limitations of my scope, I've not yet been able
to analyze the duration and consistency of these zero-goings.
Maybe what you've written here is a clue.  The zero spaces might be
some kind of correction?