On Mon, 7 Feb 2000, Marko Mäkelä wrote: > 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)? Very interesting... I must admit I'd never noticed that on any of my boards, but if I could go back home and check I would. You can certainly get oscillator modules in a 14 pin DIL package spacing (ie. 0.3inch by 0.6inch). That doesn't explain why a board would have space for *both* a seperate oscillator module and the PLL circuit required to generate 8MHz from 14.31818MHz or 17.73447MHz. One thing's for sure - the composite display of a C64 with 8MHz dot clock and 14MHz or 17MHz colour clock looks *terrible*. S-Video looks okay, and if you can find an NTSC machine with one of these boards, a 6567R5 or 6567R56A and an 8 pin DIN video connector it might make an interesting exercise to run a C64 permanently in the original designer-intended 8MHz/14MHz configuration. Unfortunately this won't do anything for the demo compatibility problems of 6567R56A VIC-II chips. Richard - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
Archive generated by hypermail 2.1.1.