Richard Cooper wrote:
Any ideas how I might sync to bit 3 of port 0x3DA, the video card's
vertical sync signal?
I took the liberty or reposting your question to news:alt.lang.asm -
more of a warzone than an asm forum, these days, but we were discussing
polling loops, and I thought somebody might have some ideas.
One response was "I don't bother doing that anymore, vga doesn't need
it." Would be nice if it were true, but your experience seems to differ.
Another poster (f0dder) posted a link to Kris Heidenstrom's PC timing
FAQ, and its info on "emulating a Vertical Retrace Interrupt". All dos
stuff, it wouldn't work on Linux as written, of course. But I thought
the principles might be useful. However, that's pretty much what you've
tried, without success. I didn't realize that the resolution on the
timers was so bad. Oh, well...
I still think that this approach has as much promise as anything. If the
arithmetic doesn't work out... jeez, I'm really reluctant to say
anything's "impossible"...
...
http://xerse.nfshost.com/funrestraints/post/000000000016.html
It's basically version 125, but I made it a "preview" because I'm too
angry now to bother with putting it through the amount of testing I
usually do. Seems to work just fine, though.
Great. I haven't looked at 1.26pre yet - barely getting into 1.24 - but
it looks like a useful little tool, even if it *won't* synch. Making it
a command line option as you've done may be the best you can do.
The last couple of paragraphs in that message are about Softer, the
rest is just ranting. You don't have to read the rants, but if you
like Softer, consider reading them as a way of supporting it's
development. Or some nonsense like that.
Okay, I've done my part :) Sorry to hear you're meeting with such
frustration. Look on the bright side: Softer's a *hell* of a lot better
than no graphics at all (which is what I'm used to). Thanks for sharing
it with us!
Best,
Frank
-
To unsubscribe from this list: send the line "unsubscribe linux-assembly" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
