Questions tagged [logic-gates]
A challenge either involving using logic-gates as the coding language or outputting logic gates.
13
votes
1answer
216 views
Densely packed decimal (DPD) to decimal, with logic gates
Inspired by recent popularity of nandgame on TNB, and my own previous challenge.
Background
Densely packed decimal (DPD) is a way to efficiently store decimal digits in binary. It stores three ...
13
votes
15answers
2k views
Logic Gates Manually
Make a program that simulates the basic logic gates.
Input: An all-caps word followed by 2 1 digit binary numbers, separated by spaces, such as OR 1 0. The gates <...
5
votes
0answers
264 views
What is the simplest reversible circuit that computes conjugacy of transpositions?
Reversible computation refers to computation in which little or no information is deleted. Reversible computation a major component of quantum computation, and reversible computation is potentially ...
1
vote
0answers
149 views
3-inverter with two NOT gates [closed]
Introduction
I recently came across an oral exam where the candidates were asked to find a logical circuit than can negate 3 inputs A,B,C using only two NOT gates.
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16
votes
2answers
420 views
Gerrymandering with Logic Gates
The majority function is a boolean function which takes three boolean inputs and returns the most common. For instance if maj(x,y,z) is the majority function and <...
12
votes
7answers
1k views
Draw the XNOR digital timing diagram
Below is a (schematic) Digital timing diagram, for the XNOR logic gate.
...
9
votes
2answers
412 views
The logical quine
The challenge
Simply write a program that outputs its own source code.
Nothing more than a regular quine.
The problem
We don't have a computer so we have to run the program on a programmable logic ...
17
votes
2answers
309 views
Given a truth table, output a Stackylogic program that satisfies it
Stackylogic is a programming language I made up in a previous challenge: Run Stackylogic. Read that post for full details and examples, but here is how it works paraphrased:
Stackylogic takes ...
44
votes
11answers
2k views
Run Stackylogic
Stackylogic is a logic-based programming language I made up that take in 0's and 1's for input and outputs a single ...
62
votes
77answers
11k views
Golf all the 16 logic gates with 2 inputs and 1 output!
For example, the gate A and B is a logic gate with 2 inputs and 1 output.
There are exactly 16 of them, because:
each logic gate takes two inputs, which can be ...
8
votes
9answers
379 views
Create a Boolean parser (continued)
Continuation of this challenge because the author is gone and the question is closed.
What you need to do is create a Boolean parser.
Boolean expressions, in case you haven't heard of them yet, have ...
12
votes
4answers
458 views
Build a 4-vertex Connectedness Tester using NAND gates
A connected graph is a graph that contains a path between any two vertices.
Challenge
Build a [2-input NAND-gate] circuit that determines whether a 4-vertex graph is connected.
(A gate's 2 inputs ...
13
votes
9answers
991 views
Truth Tables: Your great-grandfather's computer
If you remember back to your schooling years, you might remember learning about Truth Tables. They seemed boring, but they are basis for logic and (some would argue) all computing...
Problem
Your ...
15
votes
5answers
2k views
Express all 16 boolean functions with the less than operator
There are 16 distinct boolean functions for two binary variables, A and B:
...
33
votes
6answers
1k views
Grid Based Digital Logic (Duodyadic Tiles)
Duodyadic tiles are kinds of square function blocks that take two inputs, one from their top side and one from their left side, and have two outputs, one on their right side and one on their bottom ...
7
votes
2answers
884 views
Create a universal two-dimensional cellular automaton cell using two-way universal logic processors
In Conway's Game of Life, a cell is in a state of either on or off, depending on the on-and-off state of the eight cells surrounding it.
We can simulate this using a logic gate network with some sort ...
8
votes
4answers
3k views
Drive a hexadecimal 7-segment display using NAND logic gates
The ubiquitous 7-segment numerical display can unambiguously display all 16 hexadecimal digits as show in this wikipedia .gif
Entries for this challenge will create a circuit diagram using NAND logic ...
36
votes
1answer
2k views
Domino Circuits
Scoreboard
Here are the raw scores (i.e. domino counts) for VisualMelon's submission. I'll turn these into the normalised scores described below, when more answers come in. The existing solution can ...
9
votes
2answers
884 views
Build an EBCDIC converter using NAND logic gates
In this question, a mapping is defined between EBCDIC and a superset of ISO-8859-1.
Your task is to build a network of two-input NAND gates that will take eight inputs ...
13
votes
1answer
559 views
Build a minifloat adding machine using NAND logic gates
A minifloat is a binary representation of a floating-point number that has very few bits.
The minifloat in this question will be defined as an 6-bit number m, ...
11
votes
2answers
1k views
Build a bit-counting comparator using NAND logic gates
A bit-counting comparator (BCC) is a logic circuit that takes some number of counting inputs A1, A2, A3, ..., An as well as inputs ...
8
votes
3answers
745 views
Build a 2-way universal logic processor using NAND logic gates
A 2-way universal logic processor (2ULP) is a network of logic gates that takes two input wires A and B, as well as four other ...
12
votes
3answers
3k views
building circuit for divisibility by 3
A boolean circuit in TCS is basically a DAG consisting of And, Or, Not gates, and by what is known is "functional completeness" they can compute all possible functions. eg this is the basic principle ...
9
votes
8answers
2k views
A simple logic gate calculator
Your mission, if you choose to accept it, is to construct a simple truth evaluator for the following logical operators:
...
11
votes
2answers
938 views
Implement superoptimizer for addition
The task is to write code that can find small logical formulae for sums of bits.
The overall challenge is for your code to find the smallest possible propositional logical formula to check if the sum ...
3
votes
1answer
476 views
More fun with gates: Karnaugh simplification
Take a classic Boolean function with 4 variables, and perform a Karnaugh simplification (you can use any other method of Boolean algebra to arrive to the simplest form). The catch is: the result has ...
18
votes
2answers
6k views
Build a multiplying machine using NAND logic gates
Based on my previous question of the same type, Build an adding machine using NAND logic gates, this time you're being asked to multiply instead of add.
Build a diagram of (two-wire) NAND logic gates ...
4
votes
3answers
683 views
Build a NAND gate using multiple NAND gates
A question that had popped up in my head once - how many NAND gates would it take to build a larger, "meta-NAND" gate?
Your task is to build a black-box circuit that takes two input wires ...
6
votes
1answer
2k views
Build an adding machine using NAND logic gates
This is "programming" at its most fundamental.
Build a diagram of (two-wire) NAND logic gates that will take the input wires A1, ...
