Re: Star Wars Tie fighter issues

Well if I could take your knowledge an stuff it in my brain.. When are the
Matrix training programs going to be available???Thanks for the ideas Clay.
Yes the Rams have been replaced, So I'm off to have a look at everything
else you mentioned..

Draw all of space?? What if I draw a black hole or something? Then what
happens??

Kevin

On Thu, Aug 2, 2012 at 7:09 PM, Clay Cowgill <c.cowgill@comcast.net> wrote:

> > Video shows not only the tie fighters having issues but
> > possibly the death start and trench too. It really looks
> > like a scaling issue but it recovered a few seconds into the
> > trench run. Hummmm
>
> That's pretty neat. ;-)
>
> Smells like Mathbox to me... It's basically 'zoomed' in for the transforms
> and as a result is drawing all of "space" at a much larger scale which
> takes
> longer (dropping the frame-rate, hence why it's flickering more) and
> drawing
> off screen which gives the flashes of beam scatter illumination on the CRT.
> It's probably not the AVG since the rest of the HUD is drawing OK, so
> things
> are executing like they should by the time it's ready to display
> (subroutines, vector list, etc.). Connecting it to an oscilloscope might
> be
> neat-- you'd probably see all of 'space' being drawn out to the limits of
> the DAC voltage range.
>
> It's almost like there's a bad value getting into the transform math. 5F
> and 5H (mathbox RAM) would be easy to swap if you haven't tried that
> already. A problem with the serial multiplier and/or MAC clock could
> result
> if a scaling issue (multiplies are off by an order of magnitude or
> something), so 10C, 9C, 6C, 7C could be a cause. I wouldn't think the data
> registers would be too likely since you'd think it'd mess up some other
> coefficient in that case and you wouldn't have a good image (ie, it'd be
> wrong on a translate or something too and the shapes would be in the wrong
> position, not just at the wrong scale).
>
> (I wouldn't think it's related to the accumulator since it seems to be
> getting the basics of the math right, just with the magnitude off-- I'd
> focus on the multiplier.)
>
> This will be interesting to hear the root cause when you find it!
>
> -Clay
>
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Received on Thu Aug 2 20:14:38 2012