On Thu, Jan 12, 2023 at 10:15 AM smf <smf_at_null.net> wrote: > I can envisage a few more issues than loss of color if using the wrong > oscillator. > > IIRC the NTSC & PAL VIC2 use a different divider to generate the CPU > clock, as they use wildly different oscillators. > > On 12/01/2023 14:54, silverdr_at_srebrnysen.com wrote: > > > The crystal change is needed because the frequencies (like chroma > subcarrier) used by PAL and NTSC differ. Those are not synthesised but > derived from the crystal frequency. Generally you can change only VIC chip > and leave crystal in place and you'll still have output but there'll be no > colour. > > > > I converted a P500 and a C116 to NTSC and if one does not chance the crystal the color output goes "greyscale" Here is a semi-technical writeup I did https://vintagecomputer.net/browse_thread.cfm?id=258 in 2009 Here is the writeup I posted for the C116 conversion (PAL-->NTSC) https://vintagecomputer.net/browse_thread.cfm?id=528 BillReceived on 2023-01-12 17:00:43
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