>>>> "Gooijen" == Gooijen H
<Gooijen> writes:
Gooijen> Well, let's try to give an answer. The SWitch Register is
Gooijen> what is says: *switch* register. So you can read the
Gooijen> switches from it, but writing to it is no use. Don't shoot
Gooijen> me if I am mistaken! From memory, the address is 777570.
The switches are read-only at 777570; the display register is
write-only at the same address.
paul