逻辑地址物理地址计算

Q1) The value of Code Segment (CS) Register is 4042H and the value of different offsets is as follows:
BX: 2025H , IP: 0580H , DI: 4247H
Calculate the effective address of the memory location pointed by the CS register.

Q1)代码段(CS)寄存器的值为4042H，不同偏移量的值如下：
BX：2025H，IP：0580H，DI：4247H
计算CS寄存器指向的存储器位置的有效地址。

Ans:

答：

The offset of the CS Register is the IP register.

CS寄存器的偏移量是IP寄存器。

Therefore, the effective address of the memory location pointed by the CS register is calculated as follows:

因此，CS寄存器所指向的存储位置的有效地址的计算如下：

Effective address= Base address of CS register X 10_H + Address of IP

有效地址= CS寄存器的基地址X 10 _H + IP地址

    = 4042H X 10H + 0580H
= (40420 + 0580)H
= 41000H

Q2) Calculate the effective address for the following register:
SS: 3864H, SP: 1735H, BP: 4826H

Q2)计算以下寄存器的有效地址：
SS：3864H，SP：1735H，BP：4826H

Ans:

答：

Both SP and BP are the offsets for Stack Register (SS). The address calculated when BP is taken as the offset gives the starting address of the stack. The address when SP is taken as the offset denotes the memory location where the top of the stack lies.

SP和BP都是堆栈寄存器(SS)的偏移量。 将BP用作偏移量时计算出的地址给出了堆栈的起始地址。 将SP用作偏移量时的地址表示堆栈顶部所在的存储位置。

Therefore, the effective address for both these cases is:

因此，这两种情况的有效地址是：

    (SS X 10H) + SP     =   3640H X 10H  +  1735H
=   36400H + 1735H
=   38135H
(SS X 10H) + BP     =   3640H X 10H  + 4826H
=   36400H + 4826H
=   41226H

Q3) The value of the DS register is 3032H. And the BX register contains a 16 bit value which is equal to 3032H. 0008H is added to BX.
ADD BX, 0008H
The register AX contains some value which needs to be stored at a location as follows:
MOV [BX], AX
Calculate the address at which the value of the AX will be stored.

Q3) DS寄存器的值为3032H。 BX寄存器包含一个等于3032H的16位值。 0008H已添加到BX。
添加BX，0008H
寄存器AX包含一些需要存储在以下位置的值：
MOV [BX]，AX
计算将存储AX值的地址。

Ans:

答：

After executing the first instruction, the value of BX Register is as follows:
BX = 3040H

执行完第一条指令后，BX寄存器的值如下：
BX = 3040H

The BX register is an offset of the Data Segment (DS) register. So, the location at which the value of the AX register will be stored is calculated as follows:

BX寄存器是数据段(DS)寄存器的偏移量。 因此，将按以下方式计算AX寄存器的值的存储位置：

    (DS X 10H) + BX     =   3032H X 10H  +3040H
=   30320H + 3040H
=   33360H

Q4) You are provided the following values:
DS: 3056H, IP: 1023H, BP: 2322H and SP: 3029H
Can you calculate the effective address of the memory location as per the DS register?

Q4)为您提供以下值：
DS：3056H，IP：1023H，BP：2322H和SP：3029H
您可以根据DS寄存器计算存储位置的有效地址吗？

Ans:

答：

No, the effective address of the DS register cannot be calculated from the given values because none of the given offset is an offset of the DS Register. This can be done only in the case of segment override prefix, but as it is not mentioned here, we will not follow that.

不，由于给定的偏移量都不是DS寄存器的偏移量，因此无法根据给定的值计算DS寄存器的有效地址。 仅在段覆盖前缀的情况下才可以执行此操作，但是由于此处未提及，因此我们将不遵循。

翻译自: https://www.includehelp.com/embedded-system/problems-on-physical-address-calculation-in-8086-microprocessor.aspx

逻辑地址物理地址计算