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Code: The Hidden Language of Computer Hardware and Software

Description:

The classic guide to how computers work, updated with new chapters and interactive graphics

"For me, Code was a revelation. It was the first book about programming that spoke to me. It started with a story, and it built up, layer by layer, analogy by analogy, until I understood not just the Code, but the System. Code is a book that is as much about Systems Thinking and abstractions as it is about code and programming. Code teaches us how many unseen layers there are between the computer systems that we as users look at every day and the magical silicon rocks that we infused with lightning and taught to think."

- Scott Hanselman, Partner Program Director, Microsoft, and host of Hanselminutes

Computers are everywhere, most obviously in our laptops and smartphones, but also our cars, televisions, microwave ovens, alarm clocks, robot vacuum cleaners, and other smart appliances. Have you ever wondered what goes on inside these devices to make our lives easier but occasionally more infuriating?

For more than 20 years, readers have delighted in Charles Petzold's illuminating story of the secret inner life of computers, and now he has revised it for this new age of computing. Cleverly illustrated and easy to understand, this is the book that cracks the mystery. You'll discover what flashlights, black cats, seesaws, and the ride of Paul Revere can teach you about computing, and how human ingenuity and our compulsion to communicate have shaped every electronic device we use.

This new expanded edition explores more deeply the bit-by-bit and gate-by-gate construction of the heart of every smart device, the central processing unit that combines the simplest of basic operations to perform the most complex of feats. Petzold's companion website, CodeHiddenLanguage.com, uses animated graphics of key circuits in the book to make computers even easier to comprehend.

In addition to substantially revised and updated content, new chapters include:

  • Chapter 18: Let's Build a Clock!
  • Chapter 21: The Arithmetic Logic Unit
  • Chapter 22: Registers and Busses
  • Chapter 23: CPU Control Signals
  • Chapter 24: Jumps, Loops, and Calls
  • Chapter 28: The World Brain

From the simple ticking of clocks to the worldwide hum of the internet, Code reveals the essence of the digital revolution.


Editorial Reviews

About the Author

Charles Petzold is also the author of The Annotated Turing: A Guided Tour through Alan Turing's Historic Paper on Computability and the Turing Machine (Wiley, 2008). He wrote a bunch of other books too, but they're mostly about programming applications for Microsoft Windows, and they're all obsolete now. He lives in New York City with his wife, historian and novelist Deirdre Sinnott, and two cats named Honey and Heidi. His website is www.charlespetzold.com.

Reviews:

5.0 out of 5 stars Engaging Read for Beginners and Techies Alike

A. · August 19, 2025

An engaging and accessible exploration of how computers really work. The author breaks down complex concepts into simple, relatable explanations, making topics like binary, logic gates, and basic circuits far less intimidating. For newcomers, it’s a great way to build a foundational understanding of computer theory with just a touch of electrical engineering.As someone with a technical background, I still found it entertaining; the examples and analogies added fresh ways to frame ideas I already knew. It’s the kind of book that can bridge the gap between “I use computers” and “I understand what’s happening under the hood.”Highly recommended for anyone curious about what makes hardware and software tick, whether you’re starting from scratch or just want a new perspective.

5.0 out of 5 stars Great book for anyone interested in computing

S.S. · May 17, 2025

Fantastic book. It goes through the invention of hardware that use code. It shows how most are a binary system from braille to the telegraph. It introduces electricity concepts like current, resistance, conductiveness. It gives you the concepts of logic with logical gates and Boolean Algebra.

5.0 out of 5 stars This is the book to get if you want to learn about AI

L. · January 25, 2025

I wanted to know more about all the fuzz is about with AI and Language Learning Models, a friend recommended this book, and wow, it is the authoritative compendium on the subject matter. Great read, very thorough introduction to AI pragmatics and evolutionary Quantum processing.

5.0 out of 5 stars The holy bible

j.s.g. · June 5, 2025

The second edition is well written. Charles P. is known for his excellent books on programming and architecture. If you want to know how computers work, this book is for you. Be aware there are some errors (see errata on the internet). I corrected everything in 10 mins, no big deal.

5.0 out of 5 stars An absolutely brilliant book

K. · March 19, 2025

This is an amazing book for the right kind of reader. It's a lot like Euclid's Elements but for computers as it leads the reader through designing a computer from first principles and builds to the point of creating software and adding peripherals. It's an amazingly clear but slightly challenging read. I have given this book as a gift many many times. It's an absolute classic in my opinion.

5.0 out of 5 stars Easy, fun read

A.S. · December 29, 2024

A very basic book that should be mandatory for anyone working with computers, from basic coding to electrical engineers. It’s easy to read, goes over the whole process from early communication with flash lights to switches and routers, to how code works with the computers hardware. As a data scientist without much of a computer science background, this was a delight.

4.0 out of 5 stars A great book on the basics of computing

J.H. · January 14, 2023

I never read the first edition of Code, but this seems to be an improvement. I'm only 100 pages in, but it is quite readable and I like the author's pace - though there's alot of material that's covered, the pace is relaxed and the reader usually won't feel overwhelmed. A minor flaw that I've noticed is that the physics underlying some of the engineering wasn't explained in detail, and that would've helped with regards to be being able to understand the circuits. On the whole, this book seems to be great, and I'd highly recommend it to programmers trying to understand the software-hardware interface.

5.0 out of 5 stars If you only buy one technical computer book, this is it

M.D. · January 31, 2023

Disclaimer: I owned the first edition for years and read it a dozen times, mainly for pleasure since it’s not only informative but also just enjoyable to read. I’m a professional software architect and have dozens of textbooks on computer science and engineering so I’ve been around the block.This is the kind of book I would buy all for all my friends (if I had more than a couple) and family members (if they were even slightly into computers, which they aren’t sadly). Petzold does an exceptional job at describing digital logic and guides you through building a conceptual CPU from very first principles.I think his bottom up approach is the way to go and has helped me understand complex topics in an extremely simple way. When I’m not reading fiction, this is my go to bedtime reading.The second edition has about 100 more pages than the first and some content has been completely reworked and it’s great.If you ever had even a passing interest in knowing how computers work at a very fundamental level, get this book!

Great product

M.D. · October 12, 2025

Interessting, great book

A Must-Read for everyone

D. · October 16, 2025

One of the best, if not the best, books on computing… nice touch with the colored diagrams

Code

D. · April 12, 2024

Good concise write up on how hardware and software interact inside an Intel 8080 cpu.

Loved it, for adults and not

C.A. · March 4, 2025

Loved it. Easy, funny way to learn more about these topics. An excellent read for younger people too.

Bom livro de fundamentos

F.D.F. · August 25, 2025

Excelente livro. Descreve de maneira muito fundamentada a estrutura de como um computador funciona e os diferentes "códigos" que são utilizados. Durante o livro ele vai estruturando o conhecimento para ir ao longo dos capítulos construíndo a estrutura de um computador simples. Muito bom para iniciantes, se forem ler de maneira sequencial, ou para consulta caso de usuários com alguma base de conhecimento.

Code: The Hidden Language of Computer Hardware and Software

Product ID: U0137909101
Condition: New

4.8

AED24243

Price includes VAT & Import Duties
Type: Paperback
Availability: In Stock

Quantity:

|

Order today to get by 7-14 business days

This item qualifies for free delivery

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Imported From: United States

At BOLO, we work hard to ensure the products you receive are new, genuine, and sourced from reputable suppliers.

BOLO is not an authorized or official retailer for most brands, nor are we affiliated with manufacturers unless specifically stated on a product page. Instead, we source verified sellers, authorized distributors or directly from the manufacturer.

Each product undergoes thorough inspection and verification at our consolidation and fulfilment centers to ensure it meets our strict authenticity and quality standards before being shipped and delivered to you.

If you ever have concerns regarding the authenticity of a product purchased from us, please contact Bolo Support. We will review your inquiry promptly and, if necessary, provide documentation verifying authenticity or offer a suitable resolution.

Your trust is our top priority, and we are committed to maintaining transparency and integrity in every transaction.

All product information, images, descriptions, and reviews originate from the manufacturer or from trusted sellers overseas. BOLO is not affiliated with, endorsed by, or an authorized retailer for most brands listed on our website unless stated otherwise.

While we strive to display accurate information, variations in packaging, labeling, instructions, or formulation may occasionally occur due to regional differences or supplier updates. For detailed or manufacturer-specific information, please contact the brand directly or reach out to BOLO Support for assistance.

Unless otherwise stated, all prices displayed on the product page include applicable taxes and import duties.

BOLO operates in accordance with the laws and regulations of United Arab Emirates. Any items found to be restricted or prohibited for sale within the UAE will be cancelled prior to shipment. We take proactive measures to ensure that only products permitted for sale in United Arab Emirates are listed on our website.

All items are shipped by air, and any products classified as “Dangerous Goods (DG)” under IATA regulations will be removed from the order and cancelled.

All orders are processed manually, and we make every effort to process them promptly once confirmed. Products cancelled due to the above reasons will be permanently removed from listings across the website.

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Code: The Hidden Language of Computer Hardware and Software

Product ID: U0137909101
Condition: New

4.8

Code: The Hidden Language of Computer Hardware and Software-0
Type: Paperback

AED24243

Price includes VAT & Import Duties
Availability: In Stock

Quantity:

|

Order today to get by 7-14 business days

This item qualifies for free delivery

Returns & Warranty policies

Imported From: United States

At BOLO, we work hard to ensure the products you receive are new, genuine, and sourced from reputable suppliers.

BOLO is not an authorized or official retailer for most brands, nor are we affiliated with manufacturers unless specifically stated on a product page. Instead, we source verified sellers, authorized distributors or directly from the manufacturer.

Each product undergoes thorough inspection and verification at our consolidation and fulfilment centers to ensure it meets our strict authenticity and quality standards before being shipped and delivered to you.

If you ever have concerns regarding the authenticity of a product purchased from us, please contact Bolo Support. We will review your inquiry promptly and, if necessary, provide documentation verifying authenticity or offer a suitable resolution.

Your trust is our top priority, and we are committed to maintaining transparency and integrity in every transaction.

All product information, images, descriptions, and reviews originate from the manufacturer or from trusted sellers overseas. BOLO is not affiliated with, endorsed by, or an authorized retailer for most brands listed on our website unless stated otherwise.

While we strive to display accurate information, variations in packaging, labeling, instructions, or formulation may occasionally occur due to regional differences or supplier updates. For detailed or manufacturer-specific information, please contact the brand directly or reach out to BOLO Support for assistance.

Unless otherwise stated, all prices displayed on the product page include applicable taxes and import duties.

BOLO operates in accordance with the laws and regulations of United Arab Emirates. Any items found to be restricted or prohibited for sale within the UAE will be cancelled prior to shipment. We take proactive measures to ensure that only products permitted for sale in United Arab Emirates are listed on our website.

All items are shipped by air, and any products classified as “Dangerous Goods (DG)” under IATA regulations will be removed from the order and cancelled.

All orders are processed manually, and we make every effort to process them promptly once confirmed. Products cancelled due to the above reasons will be permanently removed from listings across the website.

Description:

The classic guide to how computers work, updated with new chapters and interactive graphics

"For me, Code was a revelation. It was the first book about programming that spoke to me. It started with a story, and it built up, layer by layer, analogy by analogy, until I understood not just the Code, but the System. Code is a book that is as much about Systems Thinking and abstractions as it is about code and programming. Code teaches us how many unseen layers there are between the computer systems that we as users look at every day and the magical silicon rocks that we infused with lightning and taught to think."

- Scott Hanselman, Partner Program Director, Microsoft, and host of Hanselminutes

Computers are everywhere, most obviously in our laptops and smartphones, but also our cars, televisions, microwave ovens, alarm clocks, robot vacuum cleaners, and other smart appliances. Have you ever wondered what goes on inside these devices to make our lives easier but occasionally more infuriating?

For more than 20 years, readers have delighted in Charles Petzold's illuminating story of the secret inner life of computers, and now he has revised it for this new age of computing. Cleverly illustrated and easy to understand, this is the book that cracks the mystery. You'll discover what flashlights, black cats, seesaws, and the ride of Paul Revere can teach you about computing, and how human ingenuity and our compulsion to communicate have shaped every electronic device we use.

This new expanded edition explores more deeply the bit-by-bit and gate-by-gate construction of the heart of every smart device, the central processing unit that combines the simplest of basic operations to perform the most complex of feats. Petzold's companion website, CodeHiddenLanguage.com, uses animated graphics of key circuits in the book to make computers even easier to comprehend.

In addition to substantially revised and updated content, new chapters include:

  • Chapter 18: Let's Build a Clock!
  • Chapter 21: The Arithmetic Logic Unit
  • Chapter 22: Registers and Busses
  • Chapter 23: CPU Control Signals
  • Chapter 24: Jumps, Loops, and Calls
  • Chapter 28: The World Brain

From the simple ticking of clocks to the worldwide hum of the internet, Code reveals the essence of the digital revolution.


Editorial Reviews

About the Author

Charles Petzold is also the author of The Annotated Turing: A Guided Tour through Alan Turing's Historic Paper on Computability and the Turing Machine (Wiley, 2008). He wrote a bunch of other books too, but they're mostly about programming applications for Microsoft Windows, and they're all obsolete now. He lives in New York City with his wife, historian and novelist Deirdre Sinnott, and two cats named Honey and Heidi. His website is www.charlespetzold.com.

Reviews:

5.0 out of 5 stars Engaging Read for Beginners and Techies Alike

A. · August 19, 2025

An engaging and accessible exploration of how computers really work. The author breaks down complex concepts into simple, relatable explanations, making topics like binary, logic gates, and basic circuits far less intimidating. For newcomers, it’s a great way to build a foundational understanding of computer theory with just a touch of electrical engineering.As someone with a technical background, I still found it entertaining; the examples and analogies added fresh ways to frame ideas I already knew. It’s the kind of book that can bridge the gap between “I use computers” and “I understand what’s happening under the hood.”Highly recommended for anyone curious about what makes hardware and software tick, whether you’re starting from scratch or just want a new perspective.

5.0 out of 5 stars Great book for anyone interested in computing

S.S. · May 17, 2025

Fantastic book. It goes through the invention of hardware that use code. It shows how most are a binary system from braille to the telegraph. It introduces electricity concepts like current, resistance, conductiveness. It gives you the concepts of logic with logical gates and Boolean Algebra.

5.0 out of 5 stars This is the book to get if you want to learn about AI

L. · January 25, 2025

I wanted to know more about all the fuzz is about with AI and Language Learning Models, a friend recommended this book, and wow, it is the authoritative compendium on the subject matter. Great read, very thorough introduction to AI pragmatics and evolutionary Quantum processing.

5.0 out of 5 stars The holy bible

j.s.g. · June 5, 2025

The second edition is well written. Charles P. is known for his excellent books on programming and architecture. If you want to know how computers work, this book is for you. Be aware there are some errors (see errata on the internet). I corrected everything in 10 mins, no big deal.

5.0 out of 5 stars An absolutely brilliant book

K. · March 19, 2025

This is an amazing book for the right kind of reader. It's a lot like Euclid's Elements but for computers as it leads the reader through designing a computer from first principles and builds to the point of creating software and adding peripherals. It's an amazingly clear but slightly challenging read. I have given this book as a gift many many times. It's an absolute classic in my opinion.

5.0 out of 5 stars Easy, fun read

A.S. · December 29, 2024

A very basic book that should be mandatory for anyone working with computers, from basic coding to electrical engineers. It’s easy to read, goes over the whole process from early communication with flash lights to switches and routers, to how code works with the computers hardware. As a data scientist without much of a computer science background, this was a delight.

4.0 out of 5 stars A great book on the basics of computing

J.H. · January 14, 2023

I never read the first edition of Code, but this seems to be an improvement. I'm only 100 pages in, but it is quite readable and I like the author's pace - though there's alot of material that's covered, the pace is relaxed and the reader usually won't feel overwhelmed. A minor flaw that I've noticed is that the physics underlying some of the engineering wasn't explained in detail, and that would've helped with regards to be being able to understand the circuits. On the whole, this book seems to be great, and I'd highly recommend it to programmers trying to understand the software-hardware interface.

5.0 out of 5 stars If you only buy one technical computer book, this is it

M.D. · January 31, 2023

Disclaimer: I owned the first edition for years and read it a dozen times, mainly for pleasure since it’s not only informative but also just enjoyable to read. I’m a professional software architect and have dozens of textbooks on computer science and engineering so I’ve been around the block.This is the kind of book I would buy all for all my friends (if I had more than a couple) and family members (if they were even slightly into computers, which they aren’t sadly). Petzold does an exceptional job at describing digital logic and guides you through building a conceptual CPU from very first principles.I think his bottom up approach is the way to go and has helped me understand complex topics in an extremely simple way. When I’m not reading fiction, this is my go to bedtime reading.The second edition has about 100 more pages than the first and some content has been completely reworked and it’s great.If you ever had even a passing interest in knowing how computers work at a very fundamental level, get this book!

Great product

M.D. · October 12, 2025

Interessting, great book

A Must-Read for everyone

D. · October 16, 2025

One of the best, if not the best, books on computing… nice touch with the colored diagrams

Code

D. · April 12, 2024

Good concise write up on how hardware and software interact inside an Intel 8080 cpu.

Loved it, for adults and not

C.A. · March 4, 2025

Loved it. Easy, funny way to learn more about these topics. An excellent read for younger people too.

Bom livro de fundamentos

F.D.F. · August 25, 2025

Excelente livro. Descreve de maneira muito fundamentada a estrutura de como um computador funciona e os diferentes "códigos" que são utilizados. Durante o livro ele vai estruturando o conhecimento para ir ao longo dos capítulos construíndo a estrutura de um computador simples. Muito bom para iniciantes, se forem ler de maneira sequencial, ou para consulta caso de usuários com alguma base de conhecimento.

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