Packed Decimal Numbers

Please note this refer to PACKED decimal numbers. For each of the following packed decimal numbers, show the decimal value: a. 0111 0011 0000 1001 b. 0101 1000 0010 c. 0100 1010 0110

(ref2) Integer Range for one byte word in various representation.

A given microprocessor has words of one byte. What is the smallest and largest integer that can be represented in the following representations? a. Unsigned b. Sign-magnitude c. Ones complement d. Twos complement e Unsigned packed decimal f. Signed packed decimal

(ref3) Tens Complement Representation

The tens complement of the decimal number X is defined to be (10 superscript N ) – X, where N is the number of decimal digits in the number. Describe the use of tens complement representation to perform decimal subtraction. Illustrate the procedure by subtracting (0326) subscript 10 from (0736)subscript 10

(ref4) Compare by Writing Program

Compare zero-, one-, two-, and three-address machines by writing programs to compute X = (A+B X C)/D - E X F) For each of the four machines. The instructions available for use as follows: 0 Address 1 Address 2 Address 3 Address PUSH M LOAD M MOVE (X<-- Y) MOVE (X <--Y) POP STORE M ADD (X<--X +Y) ADD (X<-- Y +Z) ADD ADD M SUB (X<-- X -Y) SUB (X<-- Y -Z) SUB SUB M MUL (X<-- X x Y) MUL (X<-- Y x Z) MUL MUL M DIV (X<-- X /Y) DIV (X<-- Y /Z) DIV DIV M Legend: <-- arrow small x multiply

ref5) NOOP uses.

Many instruction sets contain the instruction NOOP, meaning no operation, which has no effect on the processor state other than incrementing the program counter Suggest some uses of this instruction.