Question

背景：

我正在编写一个程序，要求用户输入“1”或“2”，该值的ASCII值加-49，并且取决于总和是0还是1，将打印一个字符串

冲突：

当我模拟我的代码时，我注意到下图中突出显示了一条奇怪的指令。我不知道它来自哪里，但是当它被执行时它会给我错误A trap was executed with an illegal vector number.它来自哪里，我该如何解决这个问题？

谢谢！

Simulation Screenshot

CODE：

    .ORIG x3000

; INPUT REQUEST: Store input value into R0
START   TRAP x23

; FILL PROCESS: Put value -49 in address of FN. Load value in FN address (-49) into R4
    LD R4, FN
FN  .FILL #-49

; CASE CREATION: Add -49 (R4) to input value (R0)
    ADD R3, R0, R4

; BRANCHES: If R3 = 0, execute Case 1 Instruction. If R3 > 0 (specifically if R3 = 1), execute Case 2 Instruction
    BRz CAS1I
    BRp CAS2I

; BRANCH CASES:

; CASE 1 INSTRUCTION: Load Case 1 String into R1. Print string in R1. Jump to  START (input request).
CAS1I   LEA R1, CAS1S
    TRAP x22
    BRnzp START

; CASE 2 INSTRUCTION: Load Case 2 String into R2. Print string in R2. Jump to  START (input request).
CAS2I   LEA R2, CAS2S
    TRAP x22
    BRnzp START

; STRING STORAGE: Store input patterns in Case 1 String and Case 2 String
CAS1S   .STRINGZ "1100\n0110\n0011\n1001\n1100\n0110\n0011\n1001\n1100\n0110\n0011\n1001\n1100\n1001\n0011\n0110\n1100\n1001\n0011\n0110\n1100"
CAS2S   .STRINGZ "1100\n1001\n0011\n0110\n1100"

    .END

LC3：意外的TRAP xCF指令给出错误

0 个答案: