ASM program to divide two 8 bit numbers using 8085


To perform the division of two 8 bit numbers using 8085.


  1. Start the program by loading HL register pair with address of memory location.
  2. Move the data to a register(B register).
  3. Get the second data and load into Accumulator.
  4. Compare the two numbers to check for carry.
  5. Subtract the two numbers.
  6. Increment the value of carry .
  7. Check whether repeated subtraction is over and store the value of product and carry in memory location.
  8. Terminate the program.


      LXI H, 4150
      MOV B, M   ;Get the dividend in B – reg.
      MVI C, 00  ;Clear C – reg for qoutient
      INX H
      MOV A, M   ;Get the divisor in A – reg.
NEXT: CMP B      ;Compare A - reg with register B.
      JC LOOP    ;Jump on carry to LOOP
      SUB B      ;Subtract A – reg from B- reg.
      INR C      ;Increment content of register C.
      JMP NEXT   ;Jump to NEXT
LOOP: STA 4152   ;Store the remainder in Memory
      MOV A, C
      STA 4153   ;Store the quotient in memory
      HLT        ;Terminate the program.


Input: FF (4150)

FF (4251)

Output: 01 (4152) Remainder

FE (4153) Quotient


Thus the program to divide two 8-bit numbers was executed.

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Editorial Team

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