By Christopher Lampton
Instructs those that have already programmed in high-level languages in programming with the extra strong and flexible meeting or desktop language.
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Additional info for 6502 Assembly-Language Programming for Apple, Commodore, and Atari computers
SED: Prepares the microprocessor for decimal arithmetic. We will not be discussing decimal arithmetic in this book. ClD: Disables decimal arithmetic. NOP: No QQeration. Does nothing except waste time. Used when precise timing is necessary. And that is that-the complete instruction set of the 6502 microprocessor. Quite a mishmash, isn't it? You may be left wondering how anyone, even the most experienced of machine-language programmers, can produce anything useful out of that set of instructions.
You might wonder why this is called an "addressing mode" at all, since we are including the actual data in the instruction rather than the address ofthat data. However, a little reflection will reveal that we are, in a sense, telling the microprocessor where the data is stored: It is stored in the byte of memory directly after the op-code. When the 6502 sees that immediate addressing is in effect, it says to itself, "I know where the data is stored! " It then fetches the data from that location.
R~LA TIVE ADDRESSING-This form of addressing specifies the address as a displacement from the memory location of the current instruction. Although some of the more advanced microprocessors use relative addressing with a wide variety of instruction types, the 6502 uses it only with branch instructions. See the discussion of branch instructions in the last chapter for a more detailed description. The major advantage of relative addressing is that a relative address, like a zero-page address, takes up less space in memory than an absolute address.
6502 Assembly-Language Programming for Apple, Commodore, and Atari computers by Christopher Lampton