Assembly Language Step-by-step: Programming with DOS and by Jeff Duntemann

By Jeff Duntemann

The bestselling advisor to meeting language-now up-to-date and extended to incorporate assurance of Linux

This re-creation of the bestselling advisor to meeting programming now covers DOS and Linux! the second one version starts with a hugely available review of the interior operations of the Intel-based computer and systematically covers the entire steps considering writing, trying out, and debugging meeting programs.

professional writer Jeff Duntemann then offers case in point courses for either the DOS and Linux working platforms utilizing the preferred loose assembler NASM. He additionally comprises priceless info on how one can use methods and macros, plus infrequent reasons of assembly-level coding for Linux, all of which mix to provide a complete examine the complexities of meeting programming for Intel processors.

giving you the basis to create executable meeting language courses, this book:
* Explains the way to use NASM-IDE, an easy software editor and assembly-oriented improvement environment
* information the main used components of the 86-family guide set
* Teaches approximately DEBUG, the only Most worthy device you've got as an meeting language programmer
* Examines the operations that computer directions strength the CPU to perform
* Discusses the method of reminiscence addressing
* Covers coding for Linux

The CD-ROM includes:
* Net-Wide Assembler (NASM) for either DOS and Linux
* NASM-IDE, a command shell and code editor for DOS
* ALINK, a loose linker for DOS programming
* All application code examples from the ebook

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Additional resources for Assembly Language Step-by-step: Programming with DOS and Linux (with CD-ROM)

Example text

Even if you have to add in a carry from a previous column, that will bring you up (at most) to 19. Again, you carry a 1 and no more. This is important when you add numbers on paper, or within the silicon of your CPU, as we'll learn a few chapters on. " The alternative is memorizing an even larger number of tables, and since I haven't memorized them, I won't ask you to. But over time, that's what tends to happen. In hex subtraction, you should be able to dope out any given single-column subtraction by turning a familiar hexadecimal sum inside-out.

Jot down a final 0 to the right of the rest to represent the 1s column. What you have is this: 1 0 1 0 Look back at the binary equivalent of 218: 11011010. The last four digits are 1010—the binary equivalent of 0AH. The same will work for the upper half of DAH. If you work out the binary equivalence for 0DH as we just did (and it would be good mental exercise), it is 1101. ) into a single hex digit. As an example, here is a 32-bit binary number that is not the least bit remarkable: 11110000000000001111101001101110 This is a pretty obnoxious collection of bits to remember or manipulate, so let's split it up into groups of four from the right: 1111 0000 0000 0000 1111 1010 0110 1110 Each of these groups of four binary digits can be represented by a single hexadecimal digit.

Cross out the 10, make it an F. What's the Point? … if you have a hex calculator, or a hex-capable screen calculator? The point is practice. Hexadecimal is the lingua franca of assemblers, to multiply-mangle a metaphor. The more you burn a gut-level understanding of hex into your reflexes, the easier assembly language will be. Furthermore, understanding the internal structure of the machine itself will be much easier if you have that intuitive grasp of hex values. We're laying important groundwork here.

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