X86 寻址模式
REGISTER ADDRESSING MODE
MOV BX, DX; 将DX的内容赋给BX
ADD AL, BH; 将BH的内容与AL的内容相加后存入AL中
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IMMEDIATE ADDRESS MODE
MOV AX,2550H; 将2550H赋给AX
MOV CX,625; 将十进制的625赋给CX
不能直接将值赋给段寄存器，需要将值先赋给除段寄存器外的寄存器，再由该寄存器赋给段寄存器
如：MOV AX,2550H
MOV DS,AX
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DIRECT ADDRESSING MODE
MOV DL,[2400]; 将 DS:2400H的内容赋给DL
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REGISTER INDIRECT ADDRESSING MODE
MOV AL,[BX]; 将 DS:BX的内容赋给AL
MOV CL,[SI]; 将DS:SI的内容赋给CL
MOV [DI],AH；将AH 的内容赋给DS:DI
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BASED RELATIVE ADDRESSING MODE
MOV CX,[BX]+10; 将DS:BX+10与DS:BX+10+1的内容赋给CX
MOV CX,[BX+10]或MOV CX,10[BX] 均与上相同； BX+10称为有效地址值
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INDEXED RELATIVE ADDRESSING MODE
MOV DX,[SI]+5; PA = DS(左移)+ SI + 5
MOV CL,[DI]+20; PA = DS(左移) + DI +20
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BASED INDEXED ADDRESSING MODE
MOV CL,[BX][DI]+8; PA = DS(左移) + BX + DI + 8
MOV CH,[BX][SI]+20; PA = DS(左移) + BX + SI + 20
MOV AH,[BP][DI]+12; PA = SS(左移) + BP + DI + 12
MOV AH,[BP][SI]+29; PA = SS(左移) + BP + DI + 29
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不同段寄存器的偏移寄存器：
CS: IP
DS: SI,DI,BX
ES: SI,DI,BX
SS: SP,BP