Wang Shuang Assembly Language Third Edition 5th Chapter experiment 4

Sub-question (3)

The function of the following program is to copy "Mov ax,4c00h" before the instructions to memory 0:200, complete the program. On-machine debugging, track running results.

Assume Cs:code

Code segment

MOV ax, CS ; CS is the segment address of the program entry, and that's where we're going to start copying.

MOV Ds,ax

MOV ax,0020h

MOV Es,ax

MOV bx,0

MOV cx, CX ; When the program just loaded, CX stored the program size, here I am not sure of the answer, I tried to see mov ax,4c00h int 21h will not be copied, but there is a line more behind

S:mov AL,[BX]

MOV Es:[bx],al

Inc BX

Loop s

MOV ax,4c00h

int 21h

Code ends

End

Wang Shuang Assembly Language Third Edition 5th Chapter experiment 4