Re: Create Text & High Resolution into Screen

[Linards Ticmanis <ticmanis@coli.uni-sb.de>]

Michael J. Mahon wrote:

> Since the active scan line is only 40 cycles per line (the rest of the
> line is blanked), it doesn't matter to the display what data is read
> during the 15 cycles of horizontal blanking.  (Some clever code
> can determine what data is read during these "invisible" refresh
> cycles, and use it to synchronize processor execution with the
> video generator.)

Really? I always thought that syncing to the refresh was impossible on
the Apple without a card that provides blanking interrupts. What does
this code look like? Was it used in games to avoid flicker?

-- 

Linards Ticmanis

 The Master said, "The business of laying on the colors follows the
preparation of the plain ground."