Re: NTSC VIC-II timing

Date: Wed, 21 Jun 2017 18:36:30 +0200
Message-ID: <1935467.dQkdVjL4xa@rakete>
On Wednesday 21 June 2017, 19:33:00 Marko Mäkelä <> wrote:
> On Wed, Jun 21, 2017 at 06:12:12PM +0200, wrote:
> >Exactly what I meant with spending lots of time counting cycles ;-)
> Some KERNAL versions do the counting for you. If I remember correctly,
> R1 does not, but later ones do. I would guess that the R1 is as rare as
> the 6567R56A.
> The later KERNAL counts the number of cycles per line and then sets some
> flag to indicate whether the machine is PAL or NTSC.

the kernal routine is buggy though, and sometimes gives wrong result - which 
is why crackers started using their own detection routines sometime in late 
80s :)


Atheism is a nonprophet organization. 
<Steve Wright>

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Received on 2017-06-21 17:05:42

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