Discuss the use of the MOV command. Be sure to specify all the limitations of using this command.

Question

assembly language related

Answer 1

it is used to move the data from the right specified one to left specified one ...

mov a b

value at a is over written by b's value

Answer 2

Really, you should be doing your own homework.

If you're learning Assembly Language, then you should have a reference manual of all the instructions for the CPU that you're programming.

Go to Intel's web site and download the Pentium 4 Software Development Manuals.  (It consists of 3 .pdf files.)  If you had that, then you wouldn't need to ask this question.

Answer 3

The MOV instruction cannot:

    * set the value of the CS and IP registers.

    * copy value of one segment register to another segment register (should copy to general register first).

    * copy immediate value to segment register (should copy to general register first).

Example:

ORG 100h

MOV AX, 0B800h    ; set AX = B800h (VGA memory).

MOV DS, AX        ; copy value of AX to DS.

MOV CL, 'A'       ; CL = 41h (ASCII code).

MOV CH, 01011111b ; CL = color attribute.

MOV BX, 15Eh      ; BX = position on screen.

MOV [BX], CX      ; w.[0B800h:015Eh] = CX.

RET               ; returns to operating system.