Nettet30. mar. 2016 · MOV BX,OFFSET C MOV AX, [BX] ADD B,AX MOV AX,2 [BX] SAL AX,1 ADD AX,B MOV A,AX … CODE ENDS 3、假设(DS)=2000H,(SS)=2000H, (ES)=3000H, (SP)=0A200H, (AX)=0E90H,(BX)=0214H,(30214H)=2400H, … Nettet本来,若变量X定义成了16位的字类型变量(即用DW定义),可以直接写 MOV X, AX. 但因为X未定义成字,可能是用DB定义成了8位的字节,也可能是用DD定义成了32位的双字,直接那样写会出现两个操作数类型不一致的错误。. 所以就加上WORD PTR指定这一次将X变 …
flat assembler - How to do word ptr [200h] in Fasm?
Nettet关注. BYTE PTR这样的叫属性修饰符,具体来说,就是操作数为字节;相应的,WORD PTR操作数为字。. 所以,MOV BYTE PTR [BP],20H. 的结果,把立即数20H放到DS … Nettet8. feb. 2013 · 8086 assembly, about the PTR operator. this might be simple and silly but i'll ask it anyway since i don't seem to be able to figure it out. assume cs:code, ds:data data segment b dd 256 data ends code segment start: mov ax,data mov ds,ax mov ax,word ptr b -> the result of this operation will be ax:= 256 (100h) mov bx,word ptr b+1 -> … bauer leg pads
MOV AX WORD PTR[BX] 怎么理解啊 -CSDN社区
NettetMOV WORD PTR DATOS1, 5. Seleccione una instrucción que requiere DWORD PTR. ... MOV CX,[BX] MOV [SI], CX: Permite que los datos se direccionen en la posición de memoria a la que apunta un registro base (BP y BX) o un registro índice (DI y SI) Inmediato: MOV CX,1234H: MOV CX, 34H: Nettet18. jul. 2002 · 解答: mov ax, 2000h ;//把 2000h 送入 ax 中 mov ds, ax; //把 ax 的内容即 2000h 送入段寄存器ds中 mov bx,1000h;//把1000h送入bx中 mov ax , [bx]; //把内存单元 ( (ds)*16+ (bx))的内容. 若有两个4字节的无符号数相加,这两个数分别存放在 2000H 和3000H开始的单元中,将所求的和存放在 2000H ... Nettet15. des. 2024 · 2 Answers. byte ptr indicates that the memory operand refers to a byte in memory as opposed to a word or dword. Usually, this can be omitted as the assembler can infer the operand size from registers used but there are some instructions like mov [eax],0 where the size cannot be inferred, so a byte ptr, word ptr or dword ptr prefix is … bauerly langel