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| IO244 equ 230h ;244
IO273 equ 230h ;273
_stack segment stack
dw 100 DUP(?)
_stack ends
_data segment word public 'DATA'
_data ends
code segment
main proc
assume cs:code,ds:_data,ss:_stack
; 初始化寄存器
mov ax,_data
mov ds,ax
mov bx,0fefeh
start: mov dx,IO244 ; 读取244引脚的输入值
in al,dx
mov ah,al
cmp al,0ffh ; 判断输入值是否为0xff，如果不是，则进行翻转操作
jnz Next0
call ROLeft ; 调用ROLeft函数进行左移操作
jmp Next2
Next0: cmp al,0 ; 判断输入值是否为0，如果不是，跳转Next1
jnz Next1
call RORight
jmp Next2
Next1: call Light
Next2: call Delay
jmp start
main endp
ROLeft proc near
; 左移bl寄存器，并将结果存储在al寄存器中
rol bl,1
mov al,bl
; 输出左移后的值到273引脚
mov dx,IO273
out dx,ax
ret
ROLeft endp
RORight proc near
; 右移bl寄存器，并将结果存储在al寄存器中
ror bl,1
mov al,bl
mov dx,IO273
out dx,ax
ret
RORight endp
Light proc near
xor bh,1 ;bx高八位与1异或
mov al,bh
mov dx,IO273
out dx,ax
call Delay
xor bh,8
mov al,bh
mov dx,IO273
out dx,ax
call Delay
xor bh,2
mov al,bh
mov dx,IO273
out dx,ax
call Delay
xor bh,4
mov al,bh
mov dx,IO273
out dx,ax
call Delay
ret
Light endp
Delay proc near
xor cx,cx
delay1: loop delay1
ret
Delay endp
code ends
END main
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