Re: NOP instruction

H. Peter Anvin (hpa@transmeta.com)
15 Dec 1998 18:04:19 GMT

Followup to: <36761F21.B87E970D@taniwha.tssc.co.nz>
By author: Bill Currie <bill@taniwha.tssc.co.nz>
In newsgroup: linux.dev.kernel
>
> > Hmmm... Where's the time from the good ol' Z80 when you HAD a real NOP
> > instruction? *Sigh* :-)
>
> Are you *sure* (from the hip, here)? I would not be at all surprised if
> the bit encoding of the Z80's NOP was actually a special case of another
> instruction. Of course, I could be wrong, I don't *remember* the 6502's
> NOP being positioned where this was likely.
>

The Z80 NOP was 00h, and I'm pretty sure it wasn't just a
generalization of other opcodes.

-hpa

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