Re: Apple ][gs VGA Card

[herbertf@ersys.edmonton.ab.ca (Herbert Fung)]

Previously nathan@pride.ugcs.caltech.edu (Nathan Mates) wrote:
 
>   Under one mode, everything is sent out twice: once for the even
>rows, and then the same thing on the odd rows. This makes sure
>everything appears in larger pixels (even wonder why IBM 320x200 has
>such big ugly blocky pixels?). But, if you were to send a different
>picture on the even and odd rows, then you can double the vertical
>resolution without too  much effort. Thus, the difference between
>640x200 and 640x400 is that in the x200 mode, each row is displayed
>twice, but only once in x400.
 
I see what you are saying, but I can't understand how we perceive it as
higher resolution. Perhaps it's just an optical illusion.
 

--
Herbert Fung   herbertf@ersys.edmonton.ab.ca   
Edmonton Remote Systems   Serving Edmonton/Northern Alberta since 1982