Re: NTSC VIC-II timing

Date: Wed, 21 Jun 2017 18:53:45 +0200
Message-Id: <>
> On 2017-06-21, at 18:34, wrote:
>> The simple way is to disable interrupts and write a loop that samples
>> $d012, counting the cycles that go between changes. I do not know if
>> exactly such implementation is available anywhere.
> [snip]
> i wouldnt call that exactly simple :) counting cycles always needs to be cycle 
> exact code - which is far from that.
> instead, simply check the number of scanlines - 

It's could be expected but I only now noticed that the two NTSC variants in question differ also in number of scanlines. Difference, which may possibly be used to detect the variants similarly to the method used for PAL/NTSC detection.

SD! -

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Received on 2017-06-21 17:07:08

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