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发表于 2017-5-7 14:09:43
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你为什么不调试程序?
延时部分有问题,已经修复
- assume cs:code
- stack segment
- db 128 dup(0)
- stack ends
- code segment
- start:
- mov ax, stack
- mov ss, ax
- mov sp, 128
- call show_ch
- mov ax, 4c00H
- int 21H
-
- ;==========================================
- show_ch:
- push ax
- push es
- push di
- mov ax, 0b800H
- mov es, ax
-
- mov di, 160*12+40*2
- mov al, 'a'
- print:
- mov es:[di],al
- inc al
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- call delay
-
- cmp al, 'z'
- jna print
- pop di
- pop es
- pop ax
- ret
-
- ;==========================================
- delay:
- push ax
- mov al, 0
- out 70H, al
-
- in al, 71H
- mov ah, al
-
- delay_s:
- mov al, 0
- out 70H, al
-
- in al, 71H
- cmp ah, al
- je delay_s
- pop ax
- ret
-
- code ends
- end start
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