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zakruti.com » Knowledge, science, education » Crash Course
How Computers Calculate - the ALU: Crash Course Computer Science #5

How Computers Calculate - the ALU: Crash Course Computer Science #5

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Rating: 4.0; Vote: 1
Take the 2017 PBS Digital Studios Survey: Today we're going to talk about a fundamental part of all modern computers. The thing that basically everything else uses - the Arithmetic and Logic Unit (or the ALU. The ALU may not have to most exciting name, but it is the mathematical brain of a computer and is responsible for all the calculations your computer does! And it's actually not that complicated. So today we're going to use the binary and logic gates we learned in previous episodes to build one from scratch, and then we'll use our newly minted ALU when we construct the heart of a computer, the CPU, in episode 7
Date: 2022-04-04

Comments and reviews: 10


I feel like the highest level of abstraction is the infinity gauntlet, cause it's basically a computer that links your intent with nature itself. You don't need to know how quantum physics or gravity works in order to create an entire universe, the gauntlet just takes your own perception of what a universe is and turns that into its own reality. It can just make up its own rules and programs in order to achieve anything that someone wills it to do. Like when thanos got rid of half of all intelligent life-forms in the entire universe. What defines an intelligent life-form? What makes something or someone nonexistent? These variables are automatically determined by Thanos' knowledge. If we ever get to that level, we'd already be interdimensional beings that have lost the most important part of what made us human: problem-solving.
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Question: In the table at 4: 00 shouldn't there be 8 rows for all 8 possible 3 digit inputs? It looks like the table is missing a row that should read 1 0 1 1 0.
Is this a mistake by Crash Course or was it left out intentionally?

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Does anybody else notice that they show a Texas Instruments version of the first ALU made by Intel? Fun fact: Texas Instruments was developing the first MCU at the same time Intel was developing the first microprocessor
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This is one of my favourite videos ever, it made me start to actually understand how computers work. I-m going to school for computer engineering starting next year and am very excited
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Dear Carrie Anne,
thanks you very much for the whole series! Could you please suggest me literatures/ reference material for this episode?
Thanks and best regards
Nirav

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You really confused me with the way you made the half adder as when you make it its own component you switch to side of sum and carry
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I think there is a convention mistake at 4: 24, usually A is align with Sum and B with Carrier, but here it appears the other way around.
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this series is so well explained! Even though I'm not in high school yet, I am still able to fully understand this and enjoy the series!
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English is not even my first language, but somehow I've watching the playlist just for fun and i can stop it right know lol
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Fantastic series. Learning assembler to program 8-bit microcontrollers in assembler and these videos are just what I needed.
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