汇编编程语言：程序仅当输入为 ESC 时退出，并在退出前要求确认（y/n），否则循环

我只是汇编语言编程的初学者。我们的第一个任务是让程序仅在输入为 ESC 时退出。退出之前请求确认 (y/n)，否则循环。我知道 ESC 在 ASCII 代码中具有等效值，但我对插入位置或是否需要添加更多内容感到困惑。请帮我！ 这是程序：

.model small
.stack 100h
.data
    msg1 db " <-- Non alpha!$"
msg2 db "Bye!$"

.code

start:
            ; display ?
mov dl, "?"         ; copy ? to dl
mov ah, 2h      ; display subprogram
int 21h         ; display ?

mov dl, " "         ; Provide space
mov ah, 2h      ; display subprogram
int 21h         

            ; read character from keyboard
mov ah, 1h      ; keyboard input subprogram
int 21h         ; read character into al 
            ; save character while we display a Return and Line-feed
    cmp al,65d      ; 'A'
    jb Non_alpha
    cmp al,90d      ; 'Z'
    ja above_alpha_upper

    mov bl, al              ; save character in bl
    add bl,32d      ; ADD 32 decimal
mov dl, bl      ; copy character to dl
mov ah, 2h      ; display subprogram
int 21h         ; display character in dl
    jmp x

Non_alpha:
    mov ax, @data
    mov ds,ax
    mov dx,offset msg1
    mov ah,9h
    int 21h
    jmp x           ; je,ja, jb

 above_alpha_upper:
cmp al,97d      ; 'a'
jb Non_alpha
cmp al,122d     ; 'z'
ja Non_alpha

mov bl, al              ; save character in bl
    sub bl,32d      ; SUBTRACT 32 decimal
mov dl, bl      ; copy character to dl
mov ah, 2h      ; display subprogram
int 21h         ; display character in dl

x:              ; exit
mov dl, 13d             ; dl = CR, Dh
    mov ah, 2h              ; display subprogram
    int 21h                 ; display CR
            ; display Line-feed
    mov dl, 10d             ; dl = LF , Ah
    mov ah, 2h              ; display subprogram
    int 21h                 ; display LF
            ; display character read from keyboard

mov ax, @data
    mov ds,ax
    mov dx, offset msg2 ; Bye
    mov ah,9h
    int 21h

mov ax, 4c00h       ; return to ms-dos
int 21h
end start

您可以简单地将其添加到“从键盘读取”之后

在.data中添加消息：

query_quit  db "Sure to quit? (y/n)$"

并将 DS 段 init 移到代码前面，就在开头

mov ax, @data       ; this should be set initially
mov ds,ax           ; not somewhere in middle of the code

通过 21h/01h 读取字符后，可以添加 ESC 检查

read_next:     
    mov ah, 1h      ; keyboard input subprogram     *
    int 21h         ; read character into al        *

    cmp al, 1bh     ; check for [ESC]
    jnz not_escape  ; skip asking if it wasnt

    mov dx, offset query_quit
    mov ah, 9
    int 21h         ; display query string

    mov ah,1
    int 21h        ; read keyboard again (for y/n)

    cmp ah,'y'     ; quit to dos if 'y' or 'Y' was pressed
    jz x
    cmp ah,'Y'
    jz x
    jmp read_next  ; or jmp start if you want the prompt again

not_escape:
    cmp al,65d      ; 'A'        ; *
    jb Non_alpha    ;              *
    ...      

• =你之前的代码，显示我添加了一些