匯編小程序(可供預(yù)覽)-文庫吧
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【正文】 0。X,AXMOVAH,4CHINT21HCodeENDSENDStart6. 觀察堆棧出入棧時棧頂指針sp的變化情況。.MODEL SMALL.STACK 0200H.CODESTART: MOV AX,1234H MOV BX,5678H MOV CX,6543H PUSH AX PUSH BX PUSH CX POP CX POP AX POP BX INT 3 MOV AH,4CH INT 21HEND START.model small.stack 200h.codestart:mov ax,1234h push ax mov bx,5678h push bx mov cx,9812h push cx pop cx pop ax pop bx mov ah,4ch int 21hend start7. 多字節(jié)數(shù)據(jù)加法運算.model small.stack 200h.data x dw 3321h,6945h,3d7ch y dw 2c29h,485bh,0071h z dw 3 dup(?).codestart: mov ax,@data mov ds,ax lea si,x lea di,y lea bx,z mov cx,3 clcagain:mov ax,[si] mov dx,[di] adc ax,dx mov [bx],ax add si,2 add di,2 add bx,2 loop again mov ah,4ch int 21hend start8. 算術(shù)運算綜合舉例(v(x*y+z540))/xmodel small.data x dw 06h y dw 05h z dw 04h v dw 1ah.stack dw 200h.codestart:mov ax,@data mov ds,ax mov ax,x imul y 。x*y (dx,ax) mov cx,ax mov bx,dx mov ax,z cwd 。z () add cx,ax adc bx,dx 。(x*y)+z (bx,cx) sub cx,540 。x*y+z540 sbb bx,0 ?？赡苡薪栉? mov ax,v cwd 。v (dx,ax) sub ax,cx 。v(x*y+z540) sbb dx,bx idiv x 。(v(x*y+z540))/x mov ah,4ch int 21hend start9. XLAT查表指令：字符串加密.model small.data s1 db 39。abbeda39。 s2 db 6 dup(?),39。$39。 s3 db 39。xpsqm39。.stack dw 100h.codestart:mov ax,@data mov ds,ax lea bx,s3 mov si,0 mov cx,6 again:mov al,s1[si] sub al,39。a39。 xlat mov s2[si],al inc si loop again lea dx,s2 mov ah,9 int 21h mov ah,4ch int 21hend start 10. TEST指令：.model small.stack 100h.codestart: mov ax,457ah test ax,0080h jz aa mov bx,2222h jmp bbaa: mov bx,1111hbb: mov ah,4ch int 21hend start 11. MOVSB指令：字符串復(fù)制.model small.data s1 db 39。hello world39。,39。$39。 s2 db 11 dup(?),39。$39。.stack dw 100h.codestart:mov ax,@data mov ds,ax mov es,ax lea si,s1 lea di,s2 mov cx,11 cld rep movsb lea dx,s1 mov ah,9 int 21h lea dx,s2 mov ah,9 int 21h mov ah,4ch int 21hend start 12. STOSB指令：編寫程序?qū)?nèi)存從40000H到4AFFFH置為空格字符.model small.stack 1000h.codestart:mov ax,4000h mov ds,ax mov es,ax mov di,0 mov cx,0b000h cld mov al,20h
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