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 that. 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. Nicolas - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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