Re: NTSC-C64

From: Richard Atkinson (
Date: 2000-09-04 19:47:53

On Mon, 4 Sep 2000, Ojala Pasi 'Albert' wrote:

> In fact, changing the crystal (and divider) "removed" the colors in my
> Philips television set, and fine-adjusting the frequency didn't help.
> I still don't know why, but of course I didn't investigate it any
> further.

That's because the 64 with NTSC VIC-II but PAL crystal was producing a
hybrid video standard known as NTSC 4.43. Some PAL video recorders use it
when displaying NTSC tapes. The trouble with that setup is that the
horizontal line frequency is a bit out, which my old TV didn't like at

> Converting VIC20 from PAL to NTSC though.. That's much more fun than
> simply changing the VIC-II chip. <g>

Oh yes. I *still* haven't got it to work properly, with an NTSC crystal
instead of an oscillator module.


Richard Atkinson
Software Engineer
Tenison Technology EDA Ltd

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