Re: [stella] PAL/NTSC issues

Subject: Re: [stella] PAL/NTSC issues
From: Robin Harbron <macbeth@xxxxxxxxxxxxxxxxxxx>
Date: Sat, 16 May 1998 01:00:30 -0400
Glenn Saunders wrote:
> > the question would be if there's a way for the software to tell whether
> > it runs on PAL or NTSC without requiring the user to tell it to the
> > program.
> I think the Jaguar somehow manages to do that.  I don't know how it would
> be done on the 2600, though.  If it were possible it would have been done
> by now.

I can't think of a way of getting the 2600 to do it, but I'm sure most
other computers can - the C64 can do it very easily, since the current
scan line is always located in the high bit of $d011 and all of $d012...
Those 9 bits will count up to 261 or 262 on an NTSC C64 (depending on
the VIC revision) and 311 on a PAL C64.  I know Amigas can cope with
it as well.

The 2600 is probably? unique in this respect, since it's the only
machine
I know of where you have to manually trigger each new frame.  It's also
part of what makes the 2600 really cool to program on :)  I'm glad it
takes care of horizontal timing automatically though :)
-- 
Robin Harbron    macbeth@xxxxxxxxxxx
   http://www.tbaytel.net/macbeth


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