Re: strange c64 board

From: Nicolas Welte (
Date: 2000-02-07 13:55:55

Marko Mäkelä wrote:
> On Mon, 7 Feb 2000, Nicolas Welte wrote:
> > some months ago I got this strange C64: the board looks almost like the
> > old original NTSC board, but it is a PAL board and also already uses the
> > modulator and VIC cage from the next generation C64A.
> Also interesting is the place for a crystal oscillator next to the 6569
> labelled "XT".  Could that be for the dot clock (if one would like to
> replace the colourclock-based dot clock with an exact 8 MHz source, like
> the UltiMax does)?

I also already thought about that, though it would make more sense on
the original NTSC boards with the old 6567 chip, which produces better
timing from an 8MHz source. I think we had this discussion sometimes
already, and the old RS232 tables for 1MHz operation would also match

I didn't have time to analyze the circuit yet, and I'd also love to see
a similar photograph of the original board first. The only one I've got
isn't as detailed, and the VIC cage is closed anyway :-(

Also, the XT mount doesn't look as if a standard oscillator would fit, I
remember them somewhat smaller. But I didn't try, maybe I should.

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