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

By Jeff Duntemann

This can be a e-book i might hugely suggest, and have already got advised, to an individual with an curiosity in what is going on lower than the hood of pcs. it truly is written very sincerely, starts off on the very begining and assumes not anything. nevertheless, when you've got a few wisdom you will not brain analyzing in the course of the bits as the ebook is particularly humerous and stress-free to learn. certainly the simplest textual content e-book i've got learn in decades.

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

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Add 128 to the tally, and what do we have? 218. That's the decimal value of 11011010B. It's as easy as that. Converting from decimal to binary, while more difficult, is done exactly the same way as converting from decimal to hex. Go back and read that section again, searching for the general method used. In other words, see what was done and separate the essential principles from any references to a specific base like hex. I'll bet by now you can figure it out without much trouble. As a brief aside, perhaps you noticed that I started counting columns from 0 rather than 1.

2: A RAM chip. 2. But that's all done internally to the chip. As far as you on the outside are concerned, once you've applied the address to the address pins, voila! The data pin will contain a voltage representing the value of the bit you requested. If that bit contained a binary 1, the data pin will contain a 5-volt signal; otherwise, the binary 0 bit will be represented by 0 volts. Memory Access Time Chips are graded by how long it takes for the data to appear on the data pin after you've applied the address to the address pins.

Take it seriously now and you'll lose less hair later on. Binary Hexadecimal is excellent practice for taking on the strangest number base of all: binary. Binary is base 2. Given what we've learned about number bases so far, what can we surmise about base 2? Each column has a value two times the column to its right. There are only two digits (0 and 1) in the base. Counting is a little strange in binary, as you might imagine. It goes like this: 0, 1, 10, 11, 100, 101, 110, 111, 1,000 … Because it sounds absurd to say, "Zero, one, 10, 11, 100,…" it makes more sense to simply enunciate the individual digits, followed by the word binary.

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