Several days ago, I have transferred PedroM 0.82 to my 89T HW4, and I'm playing with it a bit.
In MAY (the zs interpreter, I mean), I've tried to execute "1000!" and then "2000!". Computing 1000! works properly, but 2000! crashes the calculator (Protected Memory Violation).
I've talked about the problem with Folco, and he confirms the bug, on his real 89 HW2.