Assembly Language Programs

1)Write an assembly language program to subtract two double precision numbers.

2)Write an assembly language program to multiply two positive numbers

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Write an ALP for swapping two numbers. ORG 100 LDA A STA TMP LDA B STA A LDA TMP STA B HLT A, DEC 3 B, DEC 4 TMP, DEC 0 END 4) Write the program to logically OR the two numbers without using “OR” instruction. 1

ORG 100

/Origin of program is HEX 100

2

LDA A

/Load first operand

3

CMA

/Complement A

4

STA AD

/Store at AD

5

LDA B

/Load second operand

6

CMA

/Complement B

7

AND AD

/And A and B

8

CMA

/Complement the result

9

STA RES

/Store the result

10

HLT

/Halt

DEC 5

/First operand

11

A,

12

AD,

HEX 0

/This location reserved A complement

13

B,

DEC 4

/Second operand

14

RES, HEX 0

15

END

/This location reserved for Result /End of symbolic program

5) Write the program to multiply two positive numbers by a repeated addition method. For ex., to multiply 5 x 4, the program evaluates the product by adding 5 four times, or 5+5+5+5 1

ORG 100

/Origin of program is HEX 100

2

LDA X

/Load first address of operands

3

STA PTR

/Store in pointer

4

LDA NBR

/Load minus second operand

5

STA Y

/Store in counter

6

CLA

/Clear accumulator

7

LOP, ADD PTR I /Add an operand to AC

8

ISZ Y

/Increment counter

9

BUN LOP

/Repeat loop again

10

STA MUL

/Store sum

11

HLT

/Halt

DEC 5

/First operand

12

X,

13

PTR, HEX 0

/This location reserved for a pointer

14

NBR, DEC -4

/Second operand

16

CTR, HEX 0

/This location reserved for a counter

17

MUL , HEX 0

/Sum is stored here

18

END

/End of symbolic program

6) Write a program which uses the service of an interrupt