sam-users  

Re: Interlaced video

Colin Piggot
Thu, 22 May 2008 13:16:45 -0700

Dave wrote:
> I seem to remember there was a cover tape on one of the magazines that
> had a "new display mode" that swapped between two screens at 50Hz or
> something.  Can't remember if it was "interlacing" or some method of
> increasing colours.  My memory is vague...

Yes, it was Simon Goodwin's routine on a Crash cover tape in 1990 or so. On
the frame interrupt it toggled between two screens with different palettes,
which looked absolutely horrid though on the TV's I'd tried it on. Other
routines in the issue did MODE 3 interlacing - flicking between MODE3
screens saying it would give a screen resolution of 512x384, but it's not as
the SAM only outputs non-interlaced video so again, it just appears as a bit
of a flickery mess!

Out of curiosity, what model of TV is it you have?

Colin
=====
Quazar : Hardware, Software, Spares and Repairs for the SAM Coupe
1995-2008 - Celebrating 14 Years of developing for the SAM Coupe
Website: http://www.samcoupe.com/