This file is provided for those not familiar with bit masking.
This type of function will be used regularly in PE0002 scripts
and in code where 'bit set' and 'bit clear' operations are not available.

AND
A	B	Q
0	0	0
0	1	0
1	0	0
1	1	1

AND with 1 to preserve a bit setting
AND with 0 to clear (0) a bit setting
AND with mask to check which bits are set to 1.

OR
A	B	Q
0	0	0
0	1	1
1	0	1
1	1	1

OR with 0 to preserve a bit setting
OR with 1 to set (1) a bit setting
OR with mask to check bits are set to 0.

XOR
A	B	Q
0	0	0
0	1	1
1	0	1
1	1	0

XOR with 0 to preserve a bit setting
XOR with 1 to invert a bit setting
XOR mask with value to test for equivalence to mask.

Use ! in front of the operator to get the the opposite effect.
Eg. !AND !OR !XOR