当用户按下ENTER（ASCII 10）时，代码应该减去10，然后分支到GSEND并停止，但它正在执行一些奇怪的循环。代码如下：

.orig x3000
MAIN
    LEA R0, STR1 ;R0 points to STR1, which is the memory where we store the string.
    JSR GETSTR ;Get a string from the user
    PUTS ;Print the string
    HALT

    ;Data – Change these for testing
    .blkw 50 ;Change this value when testing between 50 and 150.

;Save space for string storage. Note that this effectively limits your string
;size to 50 which is the number of zs below.
STR1 .stringz "zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz"

GETSTR

    ;save registers
    ST R2, GS_SR2
    ST R3, GS_SR3
    ST R4, GS_SR4

    LD R4, GS_LR4

    ADD R2, R0, #0

GSTOP

    GETC ;get character

    ADD R3, R0, R4 ;if newline skip to end
    BRZ GSEND

    STR R0, R2, #0 ;store letter in STR1
    OUT

    ADD R2, R2, #1 ;increment R2
    BRNZP GSTOP

GSEND

    ADD R0, R2, #0
    ;reset registers
    LD R2, GS_SR2
    LD R3, GS_SR3

    RET

GS_SR0  .fill 0
GS_SR2  .fill 0
GS_SR3  .fill 0
GS_SR4  .fill 0

GS_LR4  .fill -10

    .end

代码应该重新打印整个字符串并停止。我不知道它是从来没有到达RET还是被发送到其他地方。