On Wed, 27 Feb 2002, Cameron Kaiser wrote:
> > As published by Richard Atkinson:
> >
> > set DDR as output
> > set DR as one
> > set DDR as input
> > wait until DR is zero
Well, I think Nicolas Welte and various others had some significant input
into the technique too...
> > However, because there are no known programs for the +4 which
> > use this feature, it might be abandoned.
> > OTOH, keeping this feature would be cool!
*ahem* I executed the program on the plus/4 at the time the technique was
discovered. It uses the only spare bit on the 7501/8501, of course. So
there is at least one "program" that uses it...
> What was this "feature" again? The faster it becomes zero, the hotter
> the chip?
Yes, I think that was it. There is a similar feature, although on a
shorter timescale, in the oscillators of the SID chip.
Richard
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