[Coco] CoCo to SVGA

[KnudsenMJ at aol.com]

In a message dated 10/28/04 2:23:27 PM Eastern Daylight Time, 
theother_bob at yahoo.com writes:

> The Amiga was interlaced IIRC, so it also needed a full
>  frame buffer, which the CoCo doesn't need.

Are you sure the Coco video isn't interlaced?  I thought it was.
Wouldn't it have to be, to run on a TV?

Or maybe you mean that the odd and even horizontal scan lines contain the 
same info (are duplicates of each other).  So a single-line scan doubler should 
work as you said.

Also ISTR the Coco does not add the extra delay on the odd frames, so both 
odd and even lines display atop one another, and not spaced as in a true 
interlaced TV picture.  This gives a black line between each visible line and makes 
the picture look sharper, though "blocky".

The MM/1 is the same way, but has a mode whereby true interlacing is used to 
fill in the black lines.  It looks smoother but fuzzier -- probably better for 
photos, not text.
--Mike K.