Part I. Create an eight-bit word and then perform three of the shifting operatio

Question

Part I.

Create an eight-bit word and then perform three of the shifting operations on it.

(For ease of reading, I suggest that the word be broken into two 4-bit pieces separated by a blank space (i.e. xxxx xxxx)

The possible shifting operations include:

Logical Shift Right
Logical Shift Left
Rotate Right
Rotate Left
Arithmetic Shift Right
Arithmetic Shift Left

Each operation should be performed independently on the original 8-bit word.



Part II

Evaluate a short algebraic expression using code with three-operand instructions. The expression should have a minimum of three operands and 2 operators. Operands may be alpha or numeric.



You may only use registers A through F, plus X and T.

Registers A through F may not be changed, i.e. their values are fixed.

Register T may be used as a temporary register, and Register X must contain the final answer.



Show the postfix for the expression, and then use a stack to evaluate the expression.



As an example, consider X=A +B + C * D

The three-operand instructions would be:

ADD X, A, B

MUL T, C, D

ADD X, X, T



The Postfix would be AB+CD*+



The stack would be:

PUSH / A onto the stack

PUSH / B onto the stack

ADD /pop A & B, add them, and push the answer back on the stack

PUSH /C

PUSH / D

MUL /pop C & D, multiply them, and push the answer back on the stack

ADD / pop X & T, add them, and push the answer back on the stack

POP / X off the stack

Explanation / Answer

1)shift left program MOV 4000H ,A /*MOVING DATA STORED IN A INTO 4000H LDA 4000H RAL /*SHIFT LEFT ACCUMULATOR CODE STA 4001H /*STORING RESULT HLT 2)SHIFT RIGHT PROGRAM MOV 1000H ,A RAR STA 1001H HLT

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