Mail Archives: djgpp/1997/04/25/07:22:42
Roger Noss changed a color in the palette by writing to 0x3c8 and 0x3c9,
and asked:
>
> Does anyone know when the palette is changed: instantaneously or on the next
> vertical retrace?
>
Change is instantaneous, that is, the graphics card immediately proceeds
to changing the colour (it may take some time on slow cards though).
With many cards, this can be seen by "snow" appearing on the screen when
you change many palette entries in a row... to avoid this, vertical
retrace synchronisation is often desirable.
Hope this helps
Francois
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