Re: NTSC VIC-II timing

From: Segher Boessenkool <>
Date: Wed, 21 Jun 2017 16:31:12 -0500
Message-ID: <>
On Wed, Jun 21, 2017 at 10:06:20PM +0100, smf wrote:
> On 21/06/2017 20:08, Segher Boessenkool wrote:
> >IIRC the LP stuff can be triggered only once per frame, this makes it
> >a bit inconvenient to use for non-lightpen uses like we are discussing
> >here.  It would be nice if we could just read out the current X coor
> >directly, but nope.
> I think that is done so it only triggers the first time the beam is 
> seen. Otherwise it would get triggered on multiple lines.

Yes, it makes the readout more stable, for actual light pens.  My
point is, it's not super for what we want to do :-)


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Received on 2017-06-21 22:00:34

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