Re: Synchronising code with the scan line

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

Previously philip@labtam.labtam.oz.au (Philip Stephens) wrote:
 
>Todd P. Whitesel writes:
>
>>Be warned that if you use $C02E-C02F you will not be compatible with
>>the Video Overlay Card, unless its input is the IIgs composite video
>>out.
>
>  Is it important for my game to be VOC compatible?
>
>>The only way to be VOC compatible and do stuff like this is to use scan
>>line interrupts, and even then it's not particularly pretty because of
>>the overhead per interrupt.
>
>  Well, as it turns out I would only need to set two scan line
>interrupts to implement the flicker-free animation I need (since my
>screen copy routine takes less than two refresh cycles), but unless
>there is a need for VOC compatibility I'd prefer not to go this route.
 
Those of us with VOC's have our monitors attached to it. I'd rather not
shut down my system and to to the back to unplug my monitor from my VOC
everytime I run into a program that is incompatible with the VOC, and
there are quite a few out there.

--
Herbert Fung              herbertf@ersys.edmonton.ab.ca