On Thu, 11 Sep 1997, Archi Schekochikhin wrote:
> I am interesting about Z80 opcodes with prefixes DD/FD (ix/iy).
> Who are know about Z80's behaviour in case of using this prefixes with
> undeclared commands? Particularly I am interesting about commands like
>
> PREF ld l,a | PREF ld h,a
>
> may be in this case we will have access to low/high bytes of ix/iy?
>
You don't have to test, it will work.
But don't use it too much in your programs, because they are a
little slower than the normal ld opcodes (one cycle, but in a loop this
can make a difference).
Check for more undocumented Z80 opcodes in:
http://www.cs.vu.nl/~syoung/hardware/Z80/opcodes.html
Ricardo Bittencourt
