Question

(10) LEA BX, CX 7. Suppose that (AX)-4AOBH, the content of [1020H] storage unit is 260FH. Try to determine the results of the following instructions. (1) MOV AX, 1020H (AX) (2) XCHG AX, [1020H) ; (AX) (3) MOV AX, [1020H) ;(AX)=- (4) LEA AX, [1020H) ; (AX) 10. Suppose the size of the stack segment is 256 bytes. The starting address of the stack is 1250: 0000H, assuming there are 5 word-sized data in the stack. Try to answer the following questions: (1) What is the top address of the stack? (2) What is the bottom address of the stack? (3) What are the contents of the SS and SP? (4) If two data are popped out of the stack, what is the content of SP? 11. Design programs to realize the following calculations, and configure the flags (OF, SF, ZF, AF, PF, CF) according to the results. Determine whether the results are correct, and analyze the reason, assuming the machine-word length is 8. (2) 122-64 (4) -68+4-72) 22. Try to determine the results after executing the following program. MOV CL, 4 MOV AL, 87 MOV DL, AL AND AL, OFH OR AL,30H SHR DL, CL OR DL,30H (ALF (DL=_ 27. Try to realize the following judgements using JMP and conditional JMP instructions. (1) The contents of AX and CX are unsigned data: If (AX)>(CX), jump to BIGER; If (AX)<(CX), jump to LESS. (2) The contents of BX and DX are signed data: If (BX)>(DX), jump to BIGER; If (BXX<(DX), jump to LESS.

Answer based on microprocessor 8086