Sorry for the question but where did the ANS come from? I had to read the forums before I found a reference that the ANS key on my HP 30B is the same as the LAST-X key is on my HP 32SII.
While I'm on it, it appears that the ← key is doing double duty as the SHOW key does on the 32SII except that it's not a momentary view of all the digits like SHOW.
I suppose with further use (I'm had the 30B less than 24 hours) I'll see other changes to what use to be familiar to me. (Besides ENTER changing to INPUT) ;-)