#2518 Apple 6502 Assembly

#2518 Apple 6502 Assembly

#2518 Provide 6502 assembly code to add to numbers

Here is a simple example of 6502 assembly code to add two numbers:

        LDX #$00        ; Initialize X register to 0
        LDA #$05        ; Load the first number into the accumulator (let's say 5)
        CLC             ; Clear carry flag
        ADC #$03        ; Add the second number to the accumulator (let's say 3)
        STA $0200       ; Store the result in memory location $0200
        BRK             ; Break (end of program)

Explanation:

• LDX #$00 initializes the X register, although it isn't necessary for this particular addition, it's good practice to initialize registers when needed.
• LDA #$05 loads the first number (5 in this case) into the accumulator (A register).
• CLC clears the carry flag, which ensures no carry from previous operations interferes.
• ADC #$03 adds the second number (3) to the number in the accumulator.
• STA $0200 stores the result in memory address $0200.
• BRK ends the program.

In this example, the two numbers 5 and 3 are added, and the result (8) is stored in memory location $0200.

Let me know if you need a more complex example or additional instructions!

From <https://chatgpt.com/>