The Logic board for the main ALU is complete. It has two 16-pin inputs and four 16-pin outputs.

Following operations are performed by the board:

1: AND (A,B);

2: OR (A,B);

3: XOR (A,B);

4: NOT (A);

Inputs and outputs are going through 20-pin IDC connectors, with lines assigned as per following layout:

Ground and Vcc lines are used for powering passive control and indicator boards, for testing purposes. Otherwise these lines are non-functional.

Next are 5 small boards, 2 of them will connect the adder boards and add IDC connector to them, and 3 boards which will be a makeshift control panel to assess the functioning of big boards. The Vcc and Ground lines in connector layout are made specifically to support the little boards.

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This is how the Logic Operations board looks like:

Schematics: