Minecraft Username: GiantJupiter
Have you read the Read Before Posting post?: Yes
Your favorite thing about redstone: The copper bulb and how it acts like a positive edge-triggered T flip-flop
A build you have made which demonstrates redstone knowledge (This is your trial build): 4-bit RCA ALU with 6 logical operations and addition and subtraction
Explain what your build does in detail: There are two inputs, A and B. The two signals we have (vertically parallel in yellow) are for Invert A and Invert B. According to the 1s complement, both Invert A and Invert B simply invert the inputs.
Nothing is needed for addition; everything acts like a normal ripple-carry adder.
There is a carry-in input too, which is only activated when subtraction is done. Invert B mode is also activated for subtraction.
We use another switch called Flood Carry. This is the yellow line on the lowest level of the build. Simply turning just the flood carry on goes like this:
Sum = A XOR B XOR C
If C = 1, then
(A XOR B) AND (NOT 1) + (NOT (A XOR B)) AND 1
= NOT (A XOR B)
= A XNOR B
A XOR B can be achieved just by using A XNOR (NOT B):
A XNOR (NOT B)
= (A AND (NOT B)) OR ( (NOT A) AND (NOT (NOT B)) )
= (A AND (NOT B)) OR ((NOT A) AND B)
= A XOR B
If we want more logical operations, we need to convert XOR to OR. Fortunately, there is a mode for that. This mode basically turns off the AND torches built for the 1 1 case, thereby making the output A XOR B to A OR B (it makes the 1 1 case from 0 to 1).
For logical operations which need to be ON:
OR: XOR → OR
NOR: Flood Carry (to invert output), XOR → OR
NAND: Invert A, Invert B (inverting inputs), XOR → OR
AND: Invert A, Invert B, Flood Carry, XOR → OR
XOR has been used for inverting the inputs.
Images / videos of the build:
What is the name of the warp for your build on ORE?: rca-alu-gj
Provide your results after completing the ORE Binary Quiz: Binary Quiz completion certificate:
Completed by GiantJupiter in 7m6.827s on 12/24/2025, 00:42 UTC.
96.15% accuracy with 1/26 answers given incorrectly.
97e4c01d-d865-4fb4-be61-9bce750ec0f3-4769616e744a757069746572
0h4z5r56626r0i521l28294x1p2w0k1c2d265y1xmjja90bgmjjai5nr
Do you agree with the rules?: Yes