NTSC VIC-II timing

From: silverdr_at_wfmh.org.pl
Date: Wed, 21 Jun 2017 16:40:03 +0200
Message-Id: <B77D4E6C-72D1-4480-81A4-EDB316A10145@wfmh.org.pl>
According to the famous document by Chris Bauer, there are three timing variants of the VIC-II. While PAL is always 63 cycles per  line, with NTSC there can be either 64 or 65 cycles per line and I am in fact able to reproduce the difference with -model ntsc and -model oldntsc in the current VICE.

The question (before I spend weekend on trial'n error counting cycles and possibly reinventing the hammer ;-) is: do we have ane established, reliable software method for detecting which NTSC VIC-II is installed in the machine? I guess it must have been done multiple times by now and used in some NTSC games/demos..

SD! - http://e4aws.silverdr.com/

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Received on 2017-06-21 15:00:08

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