Mark Andrews's Atari Roots. A Guide to Atari Assembly Language PDF

By Mark Andrews

ISBN-10: 0835901300

ISBN-13: 9780835901307

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Extra info for Atari Roots. A Guide to Atari Assembly Language

Sample text

41 Chapter Three Inside the 6502 In this chapter we're going to get under the hood of your Atari computer and see how it works. Then you'll be able to find your way around inside your computer and at last start doing some assembly language programming. As we explained in Chapter 1, every computer has three main parts: a Central Processing Unit (CPU), memory (divided into RAM and ROM), and inpu t and output devices (such as keyboards, video monitors, cassette recorders, and disk drives). In a microcomputer, all of the functions of a CPU are contained in a microprocessor unit (sometimes abbreviated MPU).

Lines 10 Through 30 (Comments) Lines 10 through 30 are comments. Line 20 explains what the program does and lines 10 and 30 set off the explanatory line with white space. It's good programming practice to use remarks liberally in assembly language, as well as in most other programming languages, so we've used quite a few comments in the programs in this volume. Line 40 ("*=" Directive) This is the origin line of our sample program. Every assembly language program must start with an origin line.

Look up either 00101001 or 41 on a binary-to-decimal or decimal-to-binary conversion chart, and you'll see that the calculation was accurate. And this conversion technique will work with any other binary number. Now we'll go in the other direction, and convert a decimal number to a binary number. And here's how we'll do that: We'll divide the number by 2, and write down both the quotient and the remainder. Since we'll be dividing by 2, the quotient will be either a 1 orO. So we'll write down either a 1 or a o.

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Atari Roots. A Guide to Atari Assembly Language by Mark Andrews


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