Re: NTSC VIC-II timing

From: Segher Boessenkool <*segher_at_kernel.crashing.org*> Date: Wed, 21 Jun 2017 14:02:48 -0500 Message-ID: <20170621190248.GW16550@gate.crashing.org> · segher_at_kernel.crashing.org

On Wed, Jun 21, 2017 at 08:51:34PM +0200, Gerrit Heitsch wrote:
> >>>What about HMOS and NTSC? 8565 is only PAL, right? What's been used on 
> >>>narrow NTSC boards? Or weren't there actually any?
> >>
> >>That would have been the 8562 for the C64 and the 8564 for the C128.
> >
> >Admittedly never seen any of the two. Can those also be distinguished from 
> >their NMOS counterparts with the collision based detection?
> 
> No idea, the code I found spoke about PAL... But I would assume that 
> those parts of the circuit would be the same between PAL and NTSC.

The only difference between PAL and NTSC should be the contents of the
X and Y comparator arrays.  I've never seen a die pic of any NTSC VIC-II,
so no idea if that is actually true...  But I cannot think of any other
difference currently.

Segher

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