Download Code: The Hidden Language of Computer Hardware and Software by Charles Petzold PDF

By Charles Petzold

What do flashlights, the British invasion, black cats, and seesaws need to do with pcs? In CODE, they convey us the inventive methods we control language and invent new technique of speaking with one another. and during CODE, we see how this ingenuity and our very human compulsion to speak have pushed the technological concepts of the previous centuries.

Using daily gadgets and accepted language structures similar to Braille and Morse code, writer Charles Petzold weaves an illuminating narrative for a person who’s ever puzzled concerning the mystery internal lifetime of desktops and different clever machines.

It’s a cleverly illustrated and eminently understandable story—and alongside the best way, you’ll become aware of you’ve won a true context for realizing today’s global of computers, electronic media, and the web. it doesn't matter what your point of technical savvy, CODE will appeal you—and even perhaps wake up the technophile within. Review
Charles Petzold's most up-to-date e-book, Code: The Hidden Language of computing device and software program, crosses over into general-interest nonfiction from his ordinary programming style. It's a gently written, conscientiously researched gem that may entice someone who desires to comprehend laptop expertise at its essence. Readers know about quantity structures (decimal, octal, binary, and all that) via Petzold's sufferer (and often pleasing) prose after which realize the logical platforms which are used to procedure them. There's a great deal of old info too. From Louis Braille's improvement of his eponymous raised-dot code to Intel Corporation's unlock of its early microprocessors, Petzold offers tales of individuals attempting to converse with (and via) mechanical and electric units. It's a desirable development of applied sciences, and Petzold provides a transparent assertion of the way they healthy together.

The actual worth of Code is in its rationalization of applied sciences which were obscured for years at the back of fancy person interfaces and programming environments, which, within the identify of speedy software improvement, insulate the programmer from the computing device. In a bit on computing device language, Petzold dissects the guideline units of the genre-defining Intel 8080 and Motorola 6800 processors. He walks the reader throughout the means of acting a variety of operations with every one chip, explaining which opcodes poke which values into which registers alongside the best way. Petzold understands that the hidden language of desktops indicates genuine attractiveness. In Code, he is helping readers take pleasure in it. --David Wall

Topics covered
Mechanical and electric representations of phrases and numbers, quantity structures, good judgment gates, acting mathematical operations with good judgment gates, microprocessors, computer code, reminiscence and programming languages.

About the Author
Charles Petzold has been writing approximately home windows programming for 25 years. A home windows Pioneer Award winner, Petzold is writer of the vintage Programming home windows, the commonly acclaimed Code: The Hidden Language of machine and software program, Programming home windows mobile 7, and greater than a dozen different books.

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Extra resources for Code: The Hidden Language of Computer Hardware and Software

Sample text

3 was called: ReadWord(). All other services will be called in this way. Let's look at the most important and frequently used functions. Function no. 1: IsHasp() This function is always called first. It considers whether the hardware key is attached. Simply changing the return value of this service will absolutely not overcome HASP. Input values: • BH = 01 • BL = LPT port Return values: • EAX = 0 — Hardware key wasn't found • or • EAX = 1 — Hardware key was found Function no. 2: HaspCode () This function is usually called right after the IsHasp() function.

In recent versions, the ASPack programmers have focused on dumping the program from memory in an effort to protect the import table as much as possible. They seem to have forgotten, though, that without good antidebugging tricks and anti−disassembling macros, it is very easy to trace and view the ASPack code, so it will not take long before a new decompressor appears. 3) is another commonly used executable file encoder. It's particularly interesting because it implements anti−debugging tricks designed to make it impossible to run an encoded program when a debugger is present in memory.

51: WriteBlock() This function writes a memory block into HASP. The address from which the reading will be performed is located in EDI. The block length to be written is located in ESI, and the address from which the data to be written will be read is located in ES:EAX. To learn the actual address into which the writing will be performed, you must multiply the address in EDI by two, since the data is written by words. info • BH = 51 or 33 • BL = LPT port • ECX = password1 • EDX = password2 • EDI = start address • ESI = data block length • ES = buffer segment • EAX = buffer offset Return values: ECX = status 0 — Correct, otherwise there was an error (you can find the error description in HASP documentation) Naturally, HASP uses other functions besides the ones just discussed, including functions such as: SetTime(), GetTime(), SetDate(), GetDate(), Writebyte(), and Readbyte().

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