I hate to disagree with Stan, but my experience with 7A16Ps is that if you
install them in a non-programmable mainframe, they power up OK, but the
front panel is locked out. From looking at the schematic, it appears
possible to force them to local mode, but I haven't tried that yet.
I didn't see any way to reduce the +5V loading, but in my experience, that
is not an issue. (Maybe if you put 2 of them in one mainframe along with
some other +5V hungry plugins?)
BTW, the 7A16P is used with the 7612D as well as the 7912s.