Compilation questions, ask for the master 100, compilation questions, ask for the master

Hello classmates, I am Mr. Tong in the computer composition principle class, please complete the homework independently.

A: After the instruction is executed, (ax) = 90f7h

Because the base address register is bx, the segment address is in DS and its value is 3000h physical address segment address * 10h + valid address 3000h * 10h + 1202h = 31202h

The source operand is a 16-bit word operand. Its low-bit byte is in 31202h, and the high-bit byte is in 31202h+1=31203h.

According to the title, (31020h) = 0f7h, (31203h) = 90h, so the operand is 90f7h

You're so ruthless. More than 20 programs at once?

Hehe, no one gave you an answer, I'll do it for you.

The solution analysis is as follows:

1 start：mov ax，01h

mov bx，02h

mov cx，02h

mov dx，02h

For the beginning of the cycle, i.e. the initialization phase, there are 4 delivery instructions that are transmitted to the result:

ax=01h bx=02h cx=02h dx=02h

where cx is the cycle counter of the next cycle, cx=02h means that it will be cycled 2 times.

2 First Loop Execute the following program segment once.

nxet： inc ax ；Add 1 instruction ax=01h+1=02h

add bx，ax ；Addition instruction bx=bx+ax=02h+02h=04h

shr dx，1 ；The arithmetic right shift instruction has the highest digit to fill 0, and the result is dx=01h

loop next ；The number of cycles minus 1 cx = 02h - 1 = 01h

The second loop executes the following segment one more time.

nxet： inc ax ；Add 1 instruction ax=02h+1=03h

add bx，ax ；Addition instruction bx=bx+ax=04h+03h=07h

shr dx，1 ；The arithmetic right shift instruction with the highest digit complementing 0 results in dx=00h

loop next ；The number of cycles minus 1 cx=01h-1=00h

The result is ax=03h bx=07h dx=00h cx=00h

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In just a few lines, you're done.

In addition, this question is only a small homework problem and does not require the full program to be written.

If it appears in an exam question, it is within 10 points. There is no need for a long speech.

So, just write the following lines to get a perfect score:

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Without professional training, it will only add to the problem.