Implementation of a program to make a calculator.

Experiment No.: – 13

Aim of the Experiment: –

Implementation of a program to make a calculator.

Apparatus required: –

Sl. No.NameSpecificationQuantity
18086 Microprocessor Kit1 no.
2Keyboard1 no.

Algorithm : –

  1. Start.
  2. Initialize SI with 8500H.
  3. Initialize DI with 8600H.
  4. Copy the content of 6000H memory location to CX register. (Put the value 01H, 02H, 03H, 04H in 6000H memory location for addition, subtraction, multiplication and division respectively)
  5. Decrease CX.
  6. Jump if zero for addition.
  7. Decrease CX.
  8. Jump if zero for subtraction.
  9. Decrease CX.
  10. Jump if zero for multiplication.
  11. Decrease CX.
  12. Jump if zero for division.
  13. Addition: Copy the data of 6002H memory location to CX register.
  14. Decrease CX.
  15. Copy the content of SI memory location (i.e 1st data) to AX register.
  16. Increase two times the value of SI register.
  17. Start loop: Copy the content of SI memory location (i.e 2nd data) to BX register.
  18. Add with carry the content of AX and BX register.
  19. Copy the content of AX register to the value of DI register memory location (i.e 8600H).
  20. Increase two times the value of SI register.
  21. Decrease CX.
  22. Jump if not zero to loop (i.e step 17).
  23. End for addition program.
  24. Subtraction: Copy the data of 6002H memory location to CX register.
  25. Decrease CX.
  26. Copy the content of SI memory location (i.e 1st data) to AX register.
  27. Increase two times the value of SI register.
  28. Start loop: Copy the content of SI memory location (i.e 2nd data) to BX register.
  29. Subtract with borrow the content of AX and BX register.
  30. Copy the content of AX register to the value of DI register memory location (i.e 8600H).
  31. Increase two times the value of SI register.
  32. Decrease CX.
  33. Jump if not zero to loop (i.e step 28).
  34. End for subtraction program.
  35. Multiplication: Copy the data of 6002H memory location to CX register.
  36. Decrease CX.
  37. Copy the content of SI memory location (i.e 1st data) to AX register.
  38. Increase two times the value of SI register.
  39. Start loop: Copy the content of SI memory location (i.e 2nd data) to BX register.
  40. Multiply the content of AX with BX register.
  41. Copy the content of AX register to the value of DI register memory location (i.e 8600H).
  42. Increase two times the value of SI register.
  43. Decrease CX.
  44. Jump if not zero to loop (i.e step 39).
  45. Increase two times the value of DI register.(i. e 6004H location)
  46. Copy the content of DX register to the value of DI register memory location (i.e 8604H).
  47. End for multiplication program.
  48. Division: Copy the data of 6002H memory location to CX register.
  49. Decrease CX.
  50. Copy the content of SI memory location (i.e 1st data) to AX register.
  51. Increase two times the value of SI register.
  52. Start loop: Copy the content of SI memory location (i.e 2nd data) to BX register.
  53. Divide with carry the content of AX with BX register.
  54. Copy the content of AX register to the value of DI register memory location (i.e 8600H).
  55. Increase two times the value of SI register.
  56. Decrease CX.
  57. Jump if not zero to loop (i.e step 52).
  58. Increase two times the value of DI register.(i. e 6004H location)
  59. Copy the content of DX register to the 8604H memory location through DI register.
  60. End for division program.

Program: –

Memory AddressMnemonicsOpcodeComments
1000:0100MOV SI, 8500HBE 00 85SI<—-8500H
1000:0103MOV DI, 8600HBF 00 86DI<—-8600H
1000:0106MOV CX,[6000H]8B 0E 00 60 CX<—-[6000]H
1000:010ADEC CX49Decrease CX
1000:010BJZ ADDITION74 09Jump if Zero to Addition
1000:010DDEC CX49Decrease CX
1000:010EJZ SUBTRACTION74 1BJump if Zero to Subtraction
1000:0110DEC CX49Decrease CX
1000:0111JZ MULTIPLICATION74 2DJump if Zero to Multiplication
1000:0113DEC CX49Decrease CX
1000:0114JZ DIVISION74 43Jump if Zero to Division
1000:0116ADDITION: MOV CX, [6002H]8B 0E 02 60CX<—[6002H]
1000:011ADEC CX49Decrease CX
1000:011BMOV AX,[SI]8B 04AX<—[SI]
1000:011DINC SI46Increase SI
1000:011EINC SI46Increase SI
1000:011FLOOP:MOV BX,[SI]8B 1CLoop: B<—[SI]
1000:0121ADC AX,BX13 C3AX<—AX+BX
1000:0123MOV [DI],AX89 05[DI]<—AX
1000:0125INC SI46Increase SI
1000:0126INC SI46Increase SI
1000:0127DEC CX49Decrease CX
1000:0128JNZ LOOP75 F5Jump if not zero to loop
1000:012AINT A5 / HLTF4Stop
1000:012BSUBTRACTION: MOV CX, [6002H]8B 0E 02 60CX<—[6002H]
1000:012FDEC CX49Decrease CX
1000:0130MOV AX,[SI]8B 04AX<—[SI]
1000:0132INC SI46Increase SI
1000:0133INC SI46Increase SI
1000:0134LOOP2: MOV BX,[SI]8B 1CLoop2: BX<—[SI]
1000:0136SBB AX,BX1B C3AX<—AX-BX
1000:0138MOV [DI],AX89 05[DI]<—AX
1000:013AINC SI46Increase SI
1000:013BINC SI46Increase SI
1000:013CDEC CX49Decrease CX
1000:013DJNZ LOOP275 F5Jump if not zero to loop2
1000:013FINT A5 / HLTF4Stop
1000:0140MULTIPLICATION: MOV CX, [6002H]8B 0E 02 60CX<—[6002H]
1000:0144DEC CX49Decrease CX
1000:0145MOV AX,[SI]8B 04AX<—[SI]
1000:0147INC SI46Increase SI
1000:0148INC SI46Increase SI
1000:0149LOOP3: MOV BX,[SI]8B 1CLoop3: BX<—[SI]
1000:014BMUL BXF7 E3AX<—AX x BX
1000:014DMOV [DI],AX89 05[DI]<—AX
1000:014FINC SI46Increase SI
1000:0150INC SI46Increase SI
1000:0151DEC CX49Decrease CX
1000:0152JNZ LOOP375 F5Jump if not zero to loop3
1000:0154INC DI47Increase DI
1000:0155INC DI47Increase DI
1000:0156MOV [DI],DX89 15[DI]<—DX
1000:0158INT A5 / HLTF4Stop
1000:0159DIVISION: MOV CX, [6002H]8B 0E 02 60CX<—[6002H]
1000:015DDEC CX49Decrease CX
1000:015EMOV AX,[SI]8B 04AX<—[SI]
1000:0160INC SI46Increase SI
1000:0161INC SI46Increase SI
1000:0162LOOP4:MOV BX,[SI]8B 1CLoop4: [BX]<—[SI]
1000:0164DIV BXF7 F3AX<—AX/BX
1000:0166MOV [DI],AX89 05[DI]<—AX
1000:0168INC SI46Increase SI
1000:0169INC SI46Increase SI
1000:016ADEC CX49Decrease CX
1000:016BJNZ LOOP475 F5Jump if not zero to loop4
1000:016DINC DI47Increase DI
1000:016EINC DI47Increase DI
1000:016FMOV [DI],DX89 15[DI]<—DX
1000:0171INT A5 / HLTF4Stop
\[\color\green{ Put\; 01H,\;02H,\;03H,\;04H\; into\;}\] \[\color\green{ 6000H\; memory\;location\;for}\] \[\color\red{Addition,\;Subtraction,\;Multiplication,\; and\;Division}\] \[\color\green{ Put\;number\; of\;data\; into\; 6002H\; memory\;location}\] \[\color\magenta{ Put\;input\;data\; into\; 8500H\; memory\;location\; onwards}\] \[\color\magenta{ Get\;output\; from\;8600H\; memory\;location\;onwards}\]

Conclusion: –

To be written by student.

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