>> (Kinda like the way many old 8-bit home computers have different CPU 
>> speed depending on whether it's PAL or NTSC...)
> 
>   Not CPU speed, screen refresh rate.

http://en.wikipedia.org/wiki/C64

"CPU: MOS Technology 6510 @ 1.02 MHz (NTSC) / 0.985 MHz (PAL)"

>   The screen refresh rate in PAL areas is 50 FPS because the frequency
> of the alternate current from the wall socket is 50 Hz. In NTSC areas
> the frequency is 60 Hz, and thus the screen refresh rate is 60 FPS.

I'm guessing the variance is due to the need of the video subsystem to 
access the framebuffer at a specific rate, hence the RAM data bus needs 
to be an integral multiple of the scanrate or something...

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

Post a reply to this message