Re: A89: roxd

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Re: A89: roxd


roxl and roxr copys the xextend bit into zero.
and it is what you should use to scroll.
the best way to use it should be a roxr.w (a0)+ (you can only work on words
directly in memory)
(and ofcourse roxl.w -(a0) to scroll in the other direction)

//Olle

Dux Gregis wrote:
> 
> how do roxl and roxr work?
> 
> what does, say, roxl copy into bit zero?  the highest bit or the previous
> extend bit?
> 
> if it doesn't copy the extend bit, but instead copies the highest bit into
> the lowest bit like rol, what would be a fast way to scroll the whole screen
> right or left?
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