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February 04, 2012

Write a program to find the 1’s complement of a number.

Written by @
Apparatus Used: Microprocessor kit, Keyboards
Assumption: Suppose first number is stored at 2200 H. We have to find 1’s complement of this number and we have to store complemented at 2250 H.
Algorithm:
  • Store the number in the accumulator.
  • Get one’s complement of the number.
  • Store complemented number at given address.
Program:
 
Memory Add
Mnemonics
Op-code
Comments
2000
LDA
2200 H
Store the number in accumulator
2002
CMA
Get 1’s complement
200C
STA
2250
Store output
200F
RST
5
Set Break-point
2010
END

End the program
Description of used instruction:
LDA adr: Load data into register A (accumulator) directly from the address given within the instruction.
CMA: This instruction complements each bit of accumulator. This result of this instruction is complement.
STA: This instruction is used to store the content of accumulator at specified memory address.
RST 5: This instruction is used to set break-point for the execution.
END: This instruction is used to execute the program.
Result:
Input:
2200-88(1000 1000)
Output:
2250-77(0111 0111)
Procedure to look output
  • After press ENTER, You will get first screen
  • Press G and Provide Initial address (as 2000)
  • Press SHIFT+4,You will get first screen again
  • Press M and Provide Input location for Input (M2200)
  • Press ENTER and Provide your Input at location (2200: 88)
  • Press SHIFT+4
  • Press G and Provide Initial address (as 2000)
  • Press SHIFT+4,You will get first screen again
  • Press M and Provide address for output (M2050) and press ENTER
  • You will get your desired output.

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