I have recently constructed a 4 bit adder and accumulator.
The input of the adder is set by switches and the other input comes from the accumulator, the output is fed back into the accumulator.
The contents of the accumulator is displayed on four LED's and the carry out from the adder is displayed on one LED.
Some photographs;
The accumulator - adder:
One bit adder board:
The devise uses 144 transistors.
Tim
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