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 -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/stella.html
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