chp2_12.asm

关于8086汇编的一些作业程序

stack segment stack'stack'
      dw 32 dup(?)
stack ends
data segment
FIRST DD 89ABCDEFH
W1 DW ?
W2 DW ?
THIRD DB 5 DUP(?)
data ends
code segment
begin proc far
     assume ss:stack,cs:code,ds:data
     push ds
     sub ax,ax
     push ax
     mov ax,data
     mov ds,ax
     MOV AX,WORD PTR FIRST+2
     MOV BX,WORD PTR FIRST
     MOV W1,AX
     AND AL,03H
     MOV CL,2
     SHR BX,CL
     MOV CL,6
     SHL AL,CL
     ADD BH,AL
     MOV AX,W1
     MOV CL,2
     SAR AX,CL
     MOV THIRD,BL
     MOV THIRD+1,BH
     MOV THIRD+2,AL
     MOV THIRD+3,AH
     ret
begin endp
code ends
     end begin