> No, you could NOT make the NES generate scan line interrupts on particular
> scan lines. Sorry, no no no!! The only way to do this was to position
> sprite 0 on the scan line you wanted, and then poll the collision bit to
> wait for it to be set by the hardware. And you could only do this once per
> frame - that is, you could use sprite 0 only once, and for the rest of the
> frame it had to be timed.
Which is what I meant only I haven't _done_ it, so I didn't know the "once
per frame" bit. On particular scanline, singular, then, which doesn't help
much. So, interesting.
> The Atari 400/800, on the other hand, had display list interrupts (from
> memory), which would effectively allow you to interrupt on any scan line on
> the screen. Although memory has faded, and I concede that I may in fact be
> wrong - I have programmed all of these machines (2600, Atari 400/800 and
> NES) - so I'm pretty sure about my information.
____________________________________________________________________________
|The Mauve Baron| Beep | dankna@xxxxxxxxxxxxxx |
|---------------| Blip | http://www.bergen.org/~dankna/ |
| Dan Knapp | Bonk | C PS SQL Java Unix Mac RPN/L NES SMB1 BM |
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