Bücher Herunterladen Code: The Hidden Language (Dv- Undefined), by Charles Petzold

Bücher Herunterladen Code: The Hidden Language (Dv- Undefined), by Charles Petzold

Code: The Hidden Language (Dv- Undefined), by Charles Petzold

Bücher Herunterladen Code: The Hidden Language (Dv- Undefined), by Charles Petzold

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Synopsis

Paperback Edition What do flashlights, the British invasion, black cats, and seesaws have to do with computers? In CODE, they show us the ingenious ways we manipulate language and invent new means of communicating with each other. And through CODE, we see how this ingenuity and our very human compulsion to communicate have driven the technological innovations of the past two centuries. Using everyday objects and familiar language systems such as Braille and Morse code, author Charles Petzold weaves an illuminating narrative for anyone who s ever wondered about the secret inner life of computers and other smart machines. It s a cleverly illustrated and eminently comprehensible story and along the way, you ll discover you ve gained a real context for understanding today s world of PCs, digital media, and the Internet. No matter what your level of technical savvy, CODE will charm you and perhaps even awaken the technophile within.

Über den Autor und weitere Mitwirkende

Charles Petzold has been writing about Windows programming for 25 years. A Windows Pioneer Award winner, Petzold is author of the classic Programming Windows, the widely acclaimed Code: The Hidden Language of Computer Hardware and Software, Programming Windows Phone 7, and more than a dozen other books.

Produktinformation

Taschenbuch: 396 Seiten

Verlag: Microsoft Press Books; Auflage: 2Rev Ed (11. November 2000)

Sprache: Englisch

ISBN-10: 9780735611313

ISBN-13: 978-0735611313

ASIN: 0735611319

Größe und/oder Gewicht:

15,2 x 2,4 x 22,9 cm

Durchschnittliche Kundenbewertung:

4.3 von 5 Sternen

15 Kundenrezensionen

Amazon Bestseller-Rang:

Nr. 756 in Fremdsprachige Bücher (Siehe Top 100 in Fremdsprachige Bücher)

Ich habe dieses Buch neben einigen anderen zur Vorbereitung auf mein Informatikstudium gelesen und war begeistert. Charles Petzold hat ein großes Talent dafür, Dinge interessant und anschaulich zu erklären. Sogar meine Oma würde nach der Lektüre dieses Werks verstehen, wie ein Ripple-Carry-Addierer funktioniert, wenn sie noch leben würde und Englisch könnte. Ich kann es nur empfehlen.

A very good book. After exploring the basic ideas of code, demonstrating various codes used more than 100 years ago (e.g. Morse), giving a brief introduction of basic electronics and circuits, the book breaks down the computer (or rather, breaks down the very fundamental devices that make it truly a computer) to its smallest component, the electronic switch, and assembles new pieces by stringing multiple such switches together, and then again assembles new pieces by combining these pieces, and reiterates multiple times. By rearranging and rewiring of these various components the book slowly builds what can be called the heart and mind of a computer that is capable of doing what all computers, be they the room-sized behemoths of the 60s or a 2015 smartphone, do at a very fundamental level. The book does a fine job explaining the various concepts and the pace is okay considering the vast amount of information conveyed. I'll probably need to read it a few more times before fully grasping all concepts covered, as I'm a fast or rather, inpatient reader.This is the end of chapter 17 of 24 (or 25? can't remember) equaling about two thirds of the book. After chapter 17, after an introduction to the concept of transistors and microprocessors, a few more components of the computer are introduced and explained rather detailed (keyboard, display, hard drive...), but in general, the pace accelerates quite a bit, as the remaining, more high-level concepts that need to be explained in order to arrive at the modern computer aren't covered with as much depth, but more with a historical retelling of computing going from 1950 until 1999 (when the book was written). This includes mentioning various historically significant programming languages (e.g. algol) and operating systems such as ms-dos and its predecessor, and this is where it's the easiest to notice a slight bias towards microsoft/windows (the author being a programmer for this os and the book being published by microsoft) which is okay, given its historical significance. Unix, upon which nearly all non-microsoft operating systems are based and of which many concepts are also implemented in windows, gets about one or two pages, mainly devoted to historical aspects of its conception (GNU and Linux get about one paragraph).I personally would have preferred more information about assemblers, about coding beyond individual processor instructions (e.g. writing an assembler in assembly), how high level programming works, about the translation of high-level code into machine code (i.e.compiling), memory management, or the difference between compiling and interpreting. As another reviewer has pointed out, there could have been about 5 more chapters on software. But perhaps this would have blown the scale of the book (easily >100 pages more). Additionally, I think some of the software chapters aren't well chosen, e.g. it doesn't become clear why floating point numbers are more important for understanding the machine than let's say, hex color codes. Still a great book, the hardware parts are written really well.

I think that this is the best book that I have read all year. In some sense this is the book that I have been looking for for twenty-five years--the book that will enable me to understand how a computer does what it does. And--given the centrality of computers in our age--it has been a long wait. But now it is over. Charles Petzold (1999), Code: The Hidden Language of Computer Hardware and Software does a much better job than anything else I have ever seen in explaining computers--what they really are, and how they really work.Have you ever wondered just how your computers really work? I mean, really, really work. Not as in "an electrical signal from memory tells the processor the number to be added," but what the electrical signal is, and how it accomplishes the magic of switching on the circuits that add while switching off the other circuits that would do other things with the number. I have. I have wondered this a lot over the past decades.Yet somehow over the past several decades my hunger for an explanation has never been properly met. I have listened to people explain how two switches wired in series are an "AND"--only if both switches are closed will the lightbulb light. I have listened to people explain how IP is a packet-based communications protocol and TCP is a connection-based protocol yet the connection-based protocal can ride on top of the packet-based protocol. Somehow these explanations did not satisfy. One seemed like answering "how does a car work?" by telling how in the presence of oxygen carbon-hydrogen bonds are broken and carbon dioxide and water are created. The other seemed like anwering "how does a car work" by telling how if you step on the accelerator the car moves forward.Charles Petzold is different. He has hit the sweet spot exactly. Enough detail to satisfy anyone. Yet the detail is quickly built up as he ascends to higher and higher levels of explanation. It remains satisfying, but it also hangs together in a big picture.In fact, my only complaint is that the book isn't long enough. It is mostly a hardware book (unless you want to count Morse Code and the interpretation of flashing light bulbs as "software." By my count there are twenty chapters on hardware, and five on software. In my view only five chapters on software--one on ASCII, one on operating systems, one on floating-point arithmetic, one on high-level languages, and one on GUIs--is about ten too few. (Moreover, at one key place in his explanation (but only one) he waves his hands. He argues that it is possible to use the operation codes stored in memory to control which circuits in the processor are active. But he doesn't show how it is done.)Charles Petzold's explanatory strategy is to start with the telegraph: with how opening and closing a switch can send an electrical signal down a wire. And he wants to build up, step by step, from that point to end with our modern computers. At the end he hopes that the reader can look back--from the graphical user interface to the high-level language software constructions that generate it, from the high-level language software constructions to the machine-language code that underlies it, from the machine-language code to the electrical signals that load, store, and add bits into the computer's processor and into the computer's memory.But it doesn't stop there. It goes further down into how to construct an accumulator or a memory bank from logic gates. And then it goes down to how to build logic gates--either out of transistors or telegraph relays. And then deeper down, into how the electrons actually move through a transistor or through a relay and a wire.And at the end I could look back and say, yes, I understand how this machine works in a way that I didn't understand it before. Before I understood electricity and maybe an AND gate, and I understood high level languages. But the whole vast intermediate realm was fuzzy. Now it is much clearer. I can go from the loop back to the conditional jump back to the way that what is stored in memory is fed into the processor back to the circuits that set the program counter back to the logic gates, and finally back to the doped silicon that makes up the circuit.So I recommend this book to everyone. It is a true joy to read. And I at least could feel my mind expanding as I read it.

This is a fascinating book on many levels. Extremely well written. For anybody who uses computers in their work and always wondered what goes on under the covers, this book touches on just about every area and goes into great detail in some areas.On the other hand, don't buy this book if you want practical information about how to be a better programmer or whatever. This book is definetely suited to an enthusiast who is honestly interested in learning arcane details. It isn't going to help anyone get a higher salary or a promotion.That's what I really liked about this book. It was truly different from any other book you will ever buy from Microsoft Press or like publishers.My only real critiscism is that it seems to run out of steam at the end. Chapter after chapter is devoted to the inner workings of logic gates, memory, and so on, but almost nothing is said about operating systems.

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