8085 program for 8 bit binary division

Here, dividend is of 16 bits and divisor is of 8 bits. Dividend is stored in 8DC1 (LSB) and 8DC2 (MSB), divisor is stored in 8DC3, quotient is in 8DC4 and remainder is in 8DC5.

Mnemonics:

LHLD 8DC1H
LDA 8DC3H
MOV B, A
MVI C, 08

LOOP:
   DAD H
   MOV A, H
   SUB B
   JC AHEAD
   MOV H, A
   INR L

AHEAD:
   DCR C
   JNZ LOOP
   SHLD 8DC4H
   HLT

Observation Table:

Memory Address	Content
8DC1	04H
8DC2	01H
8DC3	03H
8DC4	56H
8DC5	02H

©Dixit Bhatta 2013

8085 program for multi-byte decimal addition

The counter is stored in 8E00H. The first set of numbers is stored from 8E01H onward, and the second set starts from 8F01H. The sum of numbers in corresponding positions is finally placed in the address of the first set of numbers.

Mnemonics:

LXI H, 8E00H
LXI D, 8F01H
MOV C, M
INX H

LOOP:
   LDAX D
   ADD M
   MOV M, A
   DCR C
   INX H
   INX D
   JNZ LOOP
   HLT

Observation table:

Memory Address	Content Before	Content After
8E00	03H	03H
8E01	12	23
8E02	10	25
8E03	09	20
8F01	11	11
8F02	15	15
8F03	11	11

©Dixit Bhatta 2013

8085 program to convert 8-bit binary to BCD

LXI H, 8D02
MOV A, M
MVI C, D
MVI B, 0

HUN:
SUI 64H
JC TENS
INRC
JMP HUN

TENS:
ADI 64H

LOOP:
SUI 0AH
JC UNITS
INR B
JMP LOOP

UNITS:
ADI 0AH

INX H
MOV M,C
INX H
MOV M,B
INX H
MOV M,A
HLT

Observation:

	Memory	Content
Input	8D02H	8D
Output	8D21H	01
	8D22H	04
	8D23H	01

©Dixit Bhatta 2013