Atari Roots. A Guide to Atari Assembly Language - download pdf or read online

By Mark Andrews

ISBN-10: 0835901300

ISBN-13: 9780835901307

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

Sample text

When your assembler encounters an origin directive, it will set the program counter of your computer's 6502 processor to the address given in the directive. The first instruction in the program will then be loaded into that memory location, and the rest of the program will follow in sequence. 62 The origin directive looks like a simple line to write, but deciding what number to put in this line can be a very tricky job, especially for the beginning assembly language programmer. There are many blocks of memory in your computer that you can't use for assembly language programs because they're reserved for other uses (for example, to hold your computer's operating system, disk operating system, BASIC interpreter, and so on).

If there's a remainder (a 1 or aO), we'll write that down, too, right underneath the first remainder. When there are no more numbers left to divide, we'll write down all of the remainders we got, reading from the bottom to the top. What we'll have then, of course, is a binary number, a number made up of ones and zeros. And that number will be the binary equivalent of the decimal number we started out with. Now let's try this conversion technique on the decimal number 117: 117/2 58/2 29/2 14/2 7/2 3/2 1/2 = 58 with a remainder of 1 = 29 with a remainder of 0 = 14 with a remainder of 1 = = = = 7 with 3 with 1 with 0 with a a a a remainder of 0 remainder of 1 remainder of 1 remainder of 1 According to the results of this calculation, the binary equivalent ofthe decimal number 117 is 01110101.

Now let's try this conversion technique on the decimal number 117: 117/2 58/2 29/2 14/2 7/2 3/2 1/2 = 58 with a remainder of 1 = 29 with a remainder of 0 = 14 with a remainder of 1 = = = = 7 with 3 with 1 with 0 with a a a a remainder of 0 remainder of 1 remainder of 1 remainder of 1 According to the results of this calculation, the binary equivalent ofthe decimal number 117 is 01110101. And this result, as a check of a decimal-to-binary conversion chart would confirm, is also accurate. 35 Binary-to-Hex and Hex-to-Binary Conversions It's easy to convert binary numbers to their decimal equivalents.

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


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