HW2soln-3750-F09

HW2soln-3750-F09 - EE 3750 HW 2 solutions 1 EE 3750...

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EE 3750 — HW 2 solutions 1 EE 3750 — Homework 2 solutions Fall 2009 1. Write an 8086 instruction sequence to subtract BX and DX from SI and then divide the result by CH. Assume that all numbers are signed binary integers. The final quotient must be an 8-bit number stored in the AL register, and all registers other than AX (that is, AH and AL) should hold the same contents at the end of the sequence as they held at the beginning of the sequence. MOV AX, SI ; only AX can change, so manipulate in AX SUB AX, BX SUB AX, DX IDIV CH ; quotient of AX/CH is in AH 2. Given the register and memory contents listed below, list the changed registers and memory locations and their contents after each instruction below executed in sequence . Contents: All integers in this problem are written in hexadecimal. Let AX = 2204, BX = 1230, CX = 1E36, DX = 7A95, SI = 4488, DI = 8B14, SP = 386, SS = A000, ES = 5000, and DS = 8000. Let DF = 0, contents of the word pointed to by DS:[SI] = 45A6, contents of the word pointed to by DS:[SI+8] = 8086, and let each other byte in memory hold 3C. SUB CX, AX
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This note was uploaded on 01/25/2011 for the course EE 3750 taught by Professor Desouza during the Fall '08 term at LSU.

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HW2soln-3750-F09 - EE 3750 HW 2 solutions 1 EE 3750...

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