wrlong and shadow registers

agodwin

I tried to record the time of an event by executing

wrlong cnt, bufferptr

but always recorded a zero at bufferptr.

I guess that this is an effect of the shadow registers, since cnt is read-only and wrlong uses the d-field to address the source register. However, I get a similar effect if I execute

wrlong phsa, bufferptr

- as I understand it, this should work OK.

I haven't been able to find any description of this in the docs I've read - can anyone explain it, please ?

Mike Green

Look at this comment by Paul Baker (Posted 2/7/2007 12:33 PM (GMT -6)) on this forum page (http://forums.parallax.com/showthread.php?p=575479).

agodwin

Ah, thanks. I'd read the docs referenced at the top of that thread but hadn't realised there were a lot more hints in the thread itself.

Now, someone mentioned the other day a google search that found things better than the built-in forum search .. but of course, I can't find that posting either. What's the trick ?

Mike Green

It's search.parallax.com.

agodwin

That's so much better ! Thanks !