Er...sorry. The time stuff was just a FYI. That's why included the
clock cycles from the Stella Programmer's Guide. Those numbers are
correct.
The 12us number is the "official" PAL (and NTSC) horizontal blank width.
It is the sum of the horizontal sync, and front and back porches of the
actual video signal. But I forget the exact breakdown for each of these.
I've learned a lot about video while working on Glenn's video mod. ;)
All I was trying to say was that Atari veered away from this "offical" number
by using 19us instead of 12us. Just a bit of trivia...that's all.
I don't remember any mention of actual times in the Stella doc, but I do
know that the clock counts given are correct.
-Chris
On Fri, 9 Jul 1999 gentlben@xxxxxxxxxxxx wrote:
> > The scanline 64us wide. Horizontal blank is 12us.
> >
> > Officially. :)
> >
> > But Atari fudges this so that HBLANK = 19us, so....
> >
> > -Chris
>
> but im not working by microseconds, im working by machine cycles...in fact,
> for the few minutes after reading ur reply, you had me confused! :P i guess
> the stella document has an error as far as microseconds are concerned...
> but the only way i could see working by microseconds is by doing time
> sensitive things like sound (for attack-decay-sustain-release)...other than that
>
> i can only see measuring time in machine and color clock cycles...yeah i did
> the calculations and it does come to about 19 us..where did you get 12?
>
> dee
>
>
>
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