There's certainly such a POKE for the
HP71B...display comes out
upside-down...
My belief is that the HP's were well enough engineered that there
were no 'Fry Pokes' accessable to the user. On Topic, one of the
neatest things I remember reading as a beginning programmer was in
the HP85 manual where it said something like:
'There is no way you can damage the computer through use of the
keyboard'.
That was the right thing to say to (somewhat shy) me.
John A.