6502架构汇编声明整数数组遇非法字节码错误，求协助

Let's break down what's going wrong and how to get your integer sum program working:

1. The Core Issues in Your Current Code #

Your approach has two critical problems:

• You're using "1" which represents the ASCII character for 1 (hex value $31), not the integer 1 itself. If you tried to sum these, you'd be adding ASCII values instead of the numbers you intend.
• The simulator is trying to execute your array data as machine code. Since $31 (ASCII "1") isn't a valid 6502 opcode, you get the "Illegal byte code encountered" error.

2. Correct Integer Array Declaration #

To store actual integer bytes, use .DB with numeric values directly (no quotes):

*= $6000  ; Pick a safe data address (avoid low memory reserved for system variables)
array:
    .DB 1, 1, 4, 3  ; These are the integer values 1,1,4,3 stored as raw bytes
array_end:  ; Marker to calculate the array length later

3. Prevent Executing Data as Code #

The error occurs because your simulator is likely starting execution at $600—where you placed your array. Separate your executable code from your data to fix this:

*= $8000  ; Standard start address for 6502 user programs (works in most simulators)
start:
    ; Example sum program
    LDA #0          ; Initialize accumulator to 0 (sum starts at 0)
    LDX #0          ; Use X register as array index
sum_loop:
    CPX #array_end - array  ; Check if we've processed all elements
    BEQ sum_done    ; Exit loop if we're finished
    ADC array,X     ; Add current array element to the sum
    INX             ; Move to the next element
    JMP sum_loop
sum_done:
    STA $0200       ; Store the final sum at memory address $0200
    BRK             ; Halt execution

; Place your data after the executable code
*= $6000
array:
    .DB 1,1,4,3
array_end:

Quick Tips #

• Always use numeric values with .DB for integers—quoted characters are for ASCII text, not raw numbers.
• Keep code and data separate: use high memory (like $8000) for your program, and mid/low memory (like $6000) for data (avoid $0000-$01FF which is used for zero-page and stack).
• Double-check your simulator's memory map to ensure you're using valid, unreserved addresses.

内容的提问来源于stack exchange，提问作者Luiz Topin