I bet he uses a general purpose computer for email, for keeping accounts, etc., just by proxy. That is, he's rich enough that he has other people do the input/output and report back to him.
Doesn't he have a cell-phone, probably a computer; use a PBX, a computer; drive a car, a computer; ride in an elevator, a computer; ...
Doesn't he have a cell-phone, probably a computer; use a PBX, a computer; drive a car, a computer; ride in an elevator, a computer; ...