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Mov bx word ptr 2200h

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 https://gpfcampground.com

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

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Category:8086汇编语言,mov word ptr x,ax,什么意思? - 百度知道

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Mov bx word ptr 2200h

汇编的习题_ss为2250,sp为0140_客院载论的博客-CSDN博客

Nettet3. nov. 2004 · For example if the memory value is 200h, the value I´m interested in is word size and I want to store it in dx the code I use is the following: mov dx, word ptr … Nettet4. jan. 2024 · 举例:MUL BYTE PTR [BX];BYTE PTR说明后面的偏移地址指向的内存单元是字节长 (8位)。 WORD PTR是字长 (8086来说就是16位)。 ALxXXH——>AX 有符号数乘法指令 格式:IMUL OPRD 指令格式及对操作数的要求与MUL指令相同。

Mov bx word ptr 2200h

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Nettet⑴ MOV BX, WORD PTR [2200H] 源操作数:直接寻址;目的操作数:寄存器寻址 解答: SS=1000H SP=1FFEH CX=2115H DX=5678H 栈中各单元内容如下所示: 地址 11FFAH 11FFCH 11FFEH 12000H RAM 2115 5678 1234 f 13. 假设有下列数据定义语句: ⑴ M 1 DB 10 ⑵ M 2 DW 2345H ⑶ M 3 DD 987865H 试写出汇编程序对这些语句汇编后所生成 … Nettet7. des. 2024 · a、push word ptr 20[bx+si-2] b、add bx,oddset a c、lea bx,4[bx] d、mov byte ptr[bx], 1000 正确答案: d 我的答案:c. 分析; a:push都是以字为单位的,先 …

Nettet29. aug. 2024 · mov QWORD PTR [rbp-0x30],0x4020c5 means exactly "move 0x4020c5 to a memory location rbp-0x30 and treat this number as qword" (8 - byte number). But q … NettetMOV BX,20H 是将20H送给BX寄存器,不是内存 MOV WORD PTR [BX],2000H 将2000H送内存,指令执行后: 22400H处为00H,22401H处为20H 抢首赞 评论

NettetMOV AX, BX ; moves contents of register BX to register AX. Immediate Operands. A constant is an immediate operand. MOV AX, 5 ; ... INC WORD PTR [BX] ; changes memory value stored to 5511h; The LABEL directive allows you to give duplicate names (aliases) to memory variables ... NettetIf you want to open MOV files on VideoStudio, you can follow the steps below. Step 1: Launch VideoStudio. Step 2: Select File > Open according to the on-screen navigation …

Nettet4. jun. 2024 · mov ax, word ptr num. When you wrote this mov ax, word ptr num you effectively asked to retrieve only the lowest word (2 bytes) at the "num" address. You got the 1st byte 33h in AL and the 2nd byte 04h in AH, combined in one register: AX=0433h. mov bx, word ptr num+ 2. This one works similarly but will instead give only the …

Nettet18. jun. 2024 · 微机原理(判断题)(指令正误).doc,指出下面指令正误,对错误指令说明错误原因 mov ds ,100×立即数不能直接送到段寄存器 mov [1200h] , 23h×目的操作数不能确定是字节属性还是字属性等 mov [1000h] , [2000h] ×存储器之间不能直接传送数据 mov 1020h , cx×立即数不能作为目的操作数 mov ax , [bx+bp+0100h] ×目的操作数的 ... tim doaneNettet微机原理--8种寻址方式 指令和指令系统指令:控制计算机完成某种操作的命令 指令系统:处理器能识别的所有指令的集合 指令的兼容性:同一系列机的指令是兼容的 指令的包含的内容: 运算数据的来源运算结果的去向执… tim diskinNettet20. feb. 2024 · mov ds, bx mov al, [0] // 表示将 内存中 数据段地址 ds: [0] 对应的一个字节的数据写入al 通用寄存器中。 (1)上面3条指令的作用是将10000H (1000:0) 中的内存数据复制到al寄存器中. (2)mov al, [address] 的意思将DS:address 中的内存数据赋值到al寄存器中。 (3)由于al 是8位寄存器,所以是将一个字节的数据赋值给al寄存器 8086 不支持直 … bauerle garageNettetLEA BX, VAR1 MOV BX, OFFSET VAR1 are even compiled into the same machine code: MOV BX, num num is a 16 bit value of the variable offset. Please note that only these registers can be used inside square brackets (as memory pointers): BX, SI, DI, BP! (see previous part of the tutorial). tim dnbNettet10. apr. 2009 · 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 X 10H+BP,亦即地址21000+6200=27200H的内容为20H; 而MOV WORD PTR [BX],2000H 的结果,27200H处为00H,27202H处为20H,按INTEL的反字节顺序存放 … bauer m2 superliteNettet20. okt. 2024 · Here the PTR operator is used to specify the type of the operand. The following examples illustrate this use: MOV WORD PTR [BX], 5 ;set word pointed to by BX = 5 INC DS:BYTE PTR 10 ;increment byte at offset 10 ;from DS This form can also be used to override the type attribute of a variable or label. tim dobbingNettet5. nov. 2024 · mov ax,count ;也可以表示为:mov ax, [count] ;假如操作系统为变量COUNT分配的有效地址是2000H ;则反汇编的指令形式为mov ax,ds: [2000H] ;再假设DS保存段地址为1492H ;则14920H+2000H=16920H ;将地址为16920H的内容传送给AX寄存器,高字节送给AH寄存器,低字节送给AL寄存器 mov指令不支持两个操作数都是存储器 … tim dnf 2021