By Christopher Lampton
Instructs those that have already programmed in high-level languages in programming with the extra strong and flexible meeting or computer language.
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Instructs those that have already programmed in high-level languages in programming with the extra robust and flexible meeting or computing device language.
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Extra info for 6502 Assembly-Language Programming for Apple, Commodore, and Atari computers
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.
We'll describe this technique in more detail in the chapter on input/output. Not every instruction that makes reference to a memory address can use indexed addressing. For instance, the following instruction is clearly illegal: LDX $0980,X This is because the destination register and the index register are both X, a situation that would be extremely limited (and confusing) in application. The following instructions can be used with the X register as index: ADC, AND, ASL, CMP, DEC, EOR,' INC, LDA, LDY, LSR, ORA, ROL, ROR, SSC, STA.
Actually, the displacement is calculated beginning with the instruction immediately following the branch instruction, which will be at address $4002; thus, the displacement will be $3E. In hexadecimal, the above branch instruction will look like this: FO 3E where $FO is the machine-language representation of BEQ and $3E is the displacement. , How is the displacement calculated if the branch instruction branches to an instruction be/ore the current address? All displacement values greater than $7F are treated by the 6502 as negative displacements.