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MC3021
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**MC3021** is an IC that outputs a high if and only if the first two inputs are the same. As of alpha 3: any two inputs are accepted. If three are
given, the last (input 3) is ignored. If only one is given, IC retains state.

Equivalent Perlstone script: ``AB^!r``

Truth Table
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=  =  ======
A  B  Output
=  =  ======
0  0  1
1  0  0
0  1  0
1  1  1
=  =  ======


Sign Lines
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1. XNOR
2. [MC3021]
3. Blank
4. Blank


IC Pins
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Inputs
------

- The XNOR Operand

Outputs
-------

- Outputs high if all or no inputs are high


Permissions
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Node                     Description                                   Default Role 
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craftbook.ic.safe.mc3021 Allows creation of the Xnor Gate (MC3021) IC. user         
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