Oleds are known to be sloww ... that's it !!

now ... there should be a " busy " line somewhere ...

BUSY FLAG (BF)
The Busy Flag is used to determine whether IC is idle or internally operating. When IC is performingsome internal operations, the Busy Flag is set to "1". Under this condition, the no other instruction willnot be accepted. When RS Pin is set to "0" and R/WB Pin is set to "1", the Busy Flag will
be outputted to the DB7 pin.
Alain