Re: How does NTSC VIC-II produce 65 cycles per line

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Thu, 12 Jan 2023 16:45:08 +0100 Message-ID: <bbd55aaa-af01-00f4-9c98-a1c66c3554cb_at_laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 1/12/23 16:13, smf 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.

No, the VIC always divides dot clock by 8 to get the CPU clock. The 
difference between PAL and NTSC is handled by the 8701 or the discrete 
PLL on the older boards. There you need to change the divider (via 
Jumper), depending on what crystal is used.

  Gerrit