assembly - 组装emu 8086输入点击特定按钮2040

Question

这是我的代码：

DSEG    SEGMENT 'DATA'

; add DATA

DSEG    ENDS

SSEG    SEGMENT STACK   'STACK'
        DW      100h    DUP(?)
SSEG    ENDS

CSEG    SEGMENT 'CODE'

;*******************************************

START   PROC    FAR

; Store return address to OS:
    PUSH    DS
    MOV     AX, 0
    PUSH    AX

; set segment registers:
    MOV     AX, DSEG
    MOV     DS, AX
    MOV     ES, AX

; initialization
    MOV DX, 2040h
    MOV AL, 00h
    OUT DX, AL
    MOV DX, 2080h
    OUT DX, AL  

NEXT:   
    MOV DX, 2080h ; input data entrada dos buttons
    IN  AX, DX    ; 16-bit input

    MOV DX, 2040h ; output data / saida para ASCII LCD display
    OUT DX, AL

    JMP NEXT ; infinit loop


; return to operating system:
    RET
START   ENDP

;*******************************************

CSEG    ENDS 

        END    START    ; set entry point.

我想在按下按钮 1 时选择一个动作，比如调用另一个过程。

Answer 1

我找到了解决我自己问题的方法。我使用的代码如下：

DSEG    SEGMENT 'DATA'

msg1:    db      "PLAY!", 0Dh,0Ah, 24h
msg2:    db      "PAUSE!", 0Dh,0Ah, 24h
msg3:    db      "STOP!", 0Dh,0Ah, 24h
msg4:    db      "UP!", 0Dh,0Ah, 24h
msg5:    db      "DOWN!", 0Dh,0Ah, 24h

DSEG    ENDS

SSEG    SEGMENT STACK   'STACK'
        DW      100h    DUP(?)
SSEG    ENDS

CSEG    SEGMENT 'CODE'

;*******************************************

START   PROC    FAR

; Store return address to OS:
    PUSH    DS
    MOV     AX, 0
    PUSH    AX

; set segment registers:
    MOV     AX, DSEG
    MOV     DS, AX
    MOV     ES, AX

; initialization
    MOV DX, 2040h
    MOV AL, 00h
    OUT DX, AL
    MOV DX, 2080h
    OUT DX, AL  

NEXT:   
    MOV DX, 2080h ; input data entrada dos buttons
    IN  AX, DX    ; 16-bit input

    CMP AL,02
    JE  PLAY

    CMP AL,02
    JE  PAUSE

    CMP AL,04
    JE  STOP

    CMP AL,01
    JE  UP

    CMP AH,01
    JE  DOWN


    MOV DX, 2040h ; output data / saida para ASCII LCD display
    OUT DX, AL

    JMP NEXT ; infinit loop


; return to operating system:
    RET
START   ENDP



PLAY PROC

        mov     dx, msg1  ; load offset of msg into dx.
        mov     ah, 09h  ; print function is 9.
        int     21h      ; do it!

        mov     ah, 0 
        int     16h      ; wait for any key....  
    RET          
PLAY ENDP 

PAUSE PROC

        mov     dx, msg2  ; load offset of msg into dx.
        mov     ah, 09h  ; print function is 9.
        int     21h      ; do it!

        mov     ah, 0 
        int     16h      ; wait for any key....  
    RET          
PAUSE ENDP 

STOP PROC

        mov     dx, msg3  ; load offset of msg into dx.
        mov     ah, 09h  ; print function is 9.
        int     21h      ; do it!

        mov     ah, 0 
        int     16h      ; wait for any key....  
    RET          
STOP ENDP

UP PROC

        mov     dx, msg4  ; load offset of msg into dx.
        mov     ah, 09h  ; print function is 9.
        int     21h      ; do it!

        mov     ah, 0 
        int     16h      ; wait for any key....  
    RET          
UP ENDP 

DOWN PROC

        mov     dx, msg5  ; load offset of msg into dx.
        mov     ah, 09h  ; print function is 9.
        int     21h      ; do it!

        mov     ah, 0 
        int     16h      ; wait for any key....  
    RET          
DOWN ENDP 


;*******************************************

CSEG    ENDS 

        END    START    ; set entry point.