AVR-Chat

At 06:15 PM 7/25/2005, Peter Gargano wrote:
>Dave VanHorn wrote:
> >>Does anybody know what the real hardware does when it executes an
> >>unimplemented code?
>
> > Why would you want to do such a thing?
>
>Many years ago people asked the same question about the Z80. It was
>found there were many useful opcodes that were not documented. This
>was in the days when memory was more valuable than today.

I was there. Using 6 MHz Z-80 systems and designing 4 MHz Z-80 systems.
But, the undocumented opcodes were then, and still are, a gamble.
You have no idea if the next rev will do anything similar, or even 
anything at all.