Undocumented 8080 instructions?

[Eric Smith]

Chuck Guzis wrote:
 > To the best of my recollection, the undocumented 8080
 > opcodes are, by and large, no-ops or redundancies (i.e. they do the
 > same as a close-valued opcode probably from incomplete PLA decoding).
[...]
 > No startling new "triple precision divide" instructions.

I wasn't expecting any.  The reason I'm asking is to be able to 
replicate the behavior in a simulator, in case any software happened to 
use them (intentionally or otherwise).

Eric