P1 and P3 are special function registers that are treated as variables.
Px = var
var = Px
x The number of the
port. (1 or 3). P3.6 can't be used with an AT89C2051!
ACC = 0 'will reset the accumulator for example
See hardware for a
more detailed description of the ports.
P1 = &B10010101
'use binary notation