Re: Converting a Commodore 64 from NTSC to PAL

From: Gerrit Heitsch <>
Date: Fri, 13 Apr 2012 19:59:09 +0200
Message-Id: <>
On 13.04.2012, at 15:20, wrote:

> TOD clocks are inaccurate anyway therefore something like that should in fact do the trick.

I would expect the TOD clocks to be as accurate as the clock signal they get. But the chips being NMOS and able to work in the MHz range, I would expect them to consider even very short spikes and some line noise a valid signal and use it to increment the internal counter.

So unless the circuit that converts the 9V AC into a 50 Hz TTL-signal contains some kind of filter, the TOD clocks cannot be accurate.


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Received on 2012-04-13 18:00:12

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