Re: Converting a Commodore 64 from NTSC to PAL

From: Marko Mäkelä <*msmakela_at_gmail.com*> Date: Thu, 12 Apr 2012 12:04:12 +0300 Message-ID: <20120412090411.GA5588@x220> · msmakela_at_gmail.com

On Thu, Apr 12, 2012 at 02:59:03AM -0400, Jeffrey Brace wrote:
>Does anyone have any experience converting a Commodore 64 from NTSC to 
>PAL?

I have gone from PAL to NTSC. You will need to replace the VIC-II, the 
crystal and the jumper for choosing the divider. For NTSC, it is 
14.318181MHz/14, and PAL is 17.734472MHz/18.

I did not have an NTSC capable monitor, so I saw the picture in black 
and white. This was enough, because I was only interested in making my 
raster interrupts work on NTSC.

If you want to be perfect, then I guess you would also want to replace 
the ToD clock source of the CIAs. That one is derived from the mains 
frequency, which is 60Hz or 50Hz, roughly the same as the screen refresh 
rate.

	Marko

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