Feb 9, 2021 · In this post we will create an Arithmetic & Logic Unit (ALU) using logic gates. The ALU is one of the main component of the CPU. It is used in the Execution stage of the FDE cycle to perform all the logical (e.g. AND, OR, NOT) operations and …

The ALU that will be discussed here will only be able to perform addition and subtraction on 8-bit numbers and will be built from 74HC logic using XOR, AND, and OR gates. All of which will be explained in detail in this instructable.

This project goal is to build a basic 8-bits computer with a functional 8-bits processor using a digital circuit simulator (LogiSim). For future versions I will expand the circuits modules and functionalities creating a more complex processor, but for now, I'm trying to keep the circuits as simple as possible.

By setting that property to 8, you get a gate that can be connected to 8-bit inputs and outputs. In effect, an OR gate with 8 data bits is made up internally of 8 one-bit OR gates. So, you can use one of Logisim's OR gates, with its "Data Bits" property set to 8, in your ALU.

Jul 1, 2020 · Building an 8-bit computer in Logisim (Part 2— Arithmetic) In this part, we will be covering how to do all the standard arithmetic operations, addition, subtraction, multiplication, and...

This article outlines the process of constructing an 8-bit computer's Arithmetic Logic Unit (ALU) using Logisim, detailing the creation of a basic ALU capable of addition, subtraction, and logical comparisons, with plans to extend its capabilities in future installments.

An 8-bit ALU (Arithmetic Logic Unit) circuit diagram is a complex arrangement of components that are responsible for performing arithmetic and logical operations on 8-bit binary numbers. These operations include addition, subtraction, AND, OR, XOR, and more.

The AND, OR, NAND, and NOT gates each compute the respective function of the inputs, and emit the result on the output. The two-input truth table for the gates is the following.

This project is my design of a basic ALU that can perform addition, subtraction, and bitwise logic operations. This project was designed in Logisim Evolution purely through the use of digital design via logic gates. I additionally developed a simplified second circuit in hardware with breadboards once my virtual designs were complete.

I built a programmable 8-bit computer from scratch on breadboards using only simple logic gates. I documented the whole project in a series of YouTube videos and on this web site. Watch this video for an introduction: If you’re interested in seeing the computer in action to get a sense of what it can do, check out these videos: