[A86] Re: The f'n 86 screen
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[A86] Re: The f'n 86 screen
Ah, yes, you are correct. Again, more proof that the timer interrupt, or
rather the same hardware that generates the timer interrupt, also controls
the screen refresh.
Btw, what ever happened with your fancy grayscale routine? What ended up
working out the best?
> Back when I was writing FD2 I did a lot of playing around with port 3
> to get things working optimally. I'm fairly certain bit 1 tells
> whether a timer interrupt has occurred, so in Dux's routine there, it
> leaves the routine if a timer interrupt has _not_ occurred (ie/ bit 1
> is reset). This makes sense since the screen refresh is (sort of)
> related to the timer interrupts (ie/ don't mess with the video planes
> if it's not on the normal refresh cycle).
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