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

By Jeff Duntemann

It is a publication i might hugely suggest, and have already got prompt, to somebody with an curiosity in what is going on lower than the hood of pcs. it really is written very essentially, starts off on the very begining and assumes not anything. nonetheless, in case you have a few wisdom you will not brain examining during the bits as the publication is especially humerous and relaxing to learn. certainly the simplest textual content booklet i've got learn in many years.

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

Sample text

A quad word, as you might imagine, consists of two double words, for four words or eight bytes in all. Going in the other direction, some people refer to a group of four bits as a nybble-a nybble being somewhat smaller than a byte. Here's the quick tour: A bit is a single binary digit, 0 or 1. A byte is 8 bits side by side. A word is 2 bytes side by side. A double word is 2 words side by side. A quad word is 2 double words side by side. Computers were designed to store and manipulate human information.

In fact, except for the very odd and specialized kind of computers we are now building into intelligent food processors, no computer processes information in chunks smaller than 1 byte. Most computers today, in fact, process information either a word or (more and more commonly) a double word at a time. just 64 million bits. Remember that the RAM chips we use today have only one data pin. To store a byte you would have to store eight bits in sequence at eight consecutive addresses, and to retrieve that byte you would have to retrieve eight bits in sequence.

This is the only reason we use binary, but it's a pretty compelling one, and we're stuck with it. However, you will not necessarily drown in ones and zeroes, because I've already taught you a form of shorthand. Hexadecimal as Shorthand for Binary The number 218 expressed in binary is 11011010B. Expressed in hex, however, the same value is quite compact: DAH. The two hex digits comprising DAH merit a closer look. AH (or 0AH as your assembler will require it for reasons I explain later) represents 10 decimal.

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