Assignment No$\mathrm{.}3-$ Chapter $12(10$th edition$)$

Review Questions:

Question#$1($Q$12\mathrm{.}1$ P$446)$

What are the typical elements of a machine instruction?

Answer#$1($NAME$1,$ NAME$2)$:

Question#$2($Q$12\mathrm{.}2$ P$446)$

What types of locations can hold source and destination operands?

Answer#$2($NAME$1,$ NAME$2)$:

Question#$3($Q$12\mathrm{.}11$ P$446)$

List three possible places for storing the return address for a procedure return.

Answer#$3($NAME$1,$ NAME$2)$:

Question#$4($Q$12\mathrm{.}14$ P$446)$

What is the difference between big endian and little endian? Support your answer with examples for the two types.

Answer#$4($NAME$1,$ NAME$2)$:

Chapter $12(10$th edition$)$:

Problems:

Problem#$1($P$12\mathrm{.}3$ P$446-447)$

A given microprocessor has words of $1$ byte. What is the smallest and largest integer that can be represented in the following representations?

a$.$ Unsigned

b$.$ Sign$-$magnitude.

c$.$ Unsigned packed decimal.

d$.$ Signed packed decimal.

Answer#$1($NAME$1,$ NAME$2)$:

Problem#$2($P$12\mathrm{.}3$ P$446-447)$

Compare zero$-,$ one$-,$ two$-,$ and three$-$address machines by writing programs to compute X $=($A $+$ B $*$ C$)/($D $-$ E $*$ F$)$ for each of the four machines. The instructions available for use are as follows:

Answer#$1($NAME$1,$ NAME$2)$:

Assignment No$\mathrm{.}4-$ Chapter $13(10$th edition$)$:

Review Questions:

Question#$1($Q$13\mathrm{.}8$ P$484)$

What is the advantage of autoindexing?

Answer#$1($NAME$1,$ NAME$2)$:

Question#$2($Q$13\mathrm{.}9$ P$484)$

What is the difference between postindexing and preindexing? Provide your answer with examples.

Answer#$2($NAME$1,$ NAME$2)$:

Question#$3($Q$13\mathrm{.}11$ P$484)$

What are the advantages and disadvantages of using a variable$-$length instruction format?

Answer#$3($NAME$1,$ NAME$2)$:

Chapter $13(10$th edition$)$:

Problems:

Problem#$1($P$13\mathrm{.}2$ P$485)$

Let the address stored in the program counter be designated by the symbol X$1.$ The instruction stored in X$1$ has an address part $($operand reference$)$ X$2.$ The operand needed to execute the instruction is stored in the memory word with address X$3.$ An index register contains the value X$4.$ What is the relationship between these various quantities if the addressing mode of the instruction is $($a$)$ direct; $($b$)$ indirect; $($c$)$ PC relative; $($d$)$ indexed?

Answer#$1($NAME$1,$ NAME$2)$:

Problem#$2($P$13\mathrm{.}4$ P$485)$

Consider a $16-$bit processor in which the following appears in main memory, starting at location $200$:

The first part of the first word indicates that this instruction loads a value into an accumulator. The Mode field specifies an addressing mode and, if appropriate, indicates a source register; assume that when used, the source register is R$1,$ which has a value of $400.$ There is also a base register that contains the value $100.$ The value of $500$ in location $201$ may be part of the address calculation. Assume that location $399$ contains the value $999,$ location $400$ contains the value $1000,$ and so on$.$ Determine the effective address and the operand to be loaded for the following address modes:

a$.$ Direct b$.$ Immediate c$.$ Indirect d$.$ PC relative e$.$ Displacement f$.$ Register g$.$ Register indirect h$.$ Autoindexing with increment, using R$1$

Answer#$2($NAME$1,$ NAME$2)$: