8085 program to separate odd and even nos from a given list of numbers

Problem: Write an assembly language program in 8085 microprocessor to separate odd and even numbers from the given list of 50 numbers. Store odd nos in another list starting from memory location 2100H. Store even nos in another list starting from memory location 2200H. Starting address of the list is 2000H.

Examples:

Explanation:
A number is said to be odd if its least significant bit is 1 otherwise it is even. Therefore to identify whether the number is even or odd, we perform AND operation with 01 by the help of ANI instruction. If the number is odd then we will get 01 otherwise 00 in the accumulator. ANI instruction also affects the flags of 8085. Therefore if accumulator contains 00 then zero flag gets set otherwise it gets reset.

Algorithm:

1. Load the memory location 2000 in HL register pair.
2. Load the memory location 2100 in DE register pair for storing odd numbers.
3. Store the number of elements in register C.
4. Move the next number in the list to accumulator.
5. Perform AND operation with 01H to check whether the number is even or odd.
6. If even, jump to step 9.
7. Get the number in accumulator and store in the memory location pointed by DE.
8. Increment DE.
9. Increment HL. Decrement C.
10. If C is not zero, jump to step 4.

Perform similarly above steps for storing even numbers.

Program:

Memory Location	Mneumonics	Comments
2000H	LXI H, 2000H	Initialize memory pointer 1
2003H	LXI D, 2100H	Initialize memory pointer 2
2006H	MVI C, 32H	Initialize counter
2008H	MOV A, M	Get the number
2009H	ANI 0lH	Check for odd number
200BH	JZ 2011H	If EVEN, don’t store
200EH	MOV A, M	Get the number
200FH	STAX D	Store the number in result list
2010H	INX D	Increment pointer 2
2011H	INX H	Increment pointer l
2012H	DCR C	Decrement counter
2013H	JNZ 2008H	If not zero, repeat
2016H	LXI H, 2000H	Initialize memory pointer l
2019H	LXI D, 2200H	Initialize memory pointer2
201CH	MVI C, 32H	Initialize counter
201EH	MOV A, M	Get the number
201FH	ANI 0lH	Check for even number
2021H	JNZ 2027H	If ODD, don’t store
2024H	MOV A, M	Get the number
2025H	STAX D	Store the number in result list
2026H	INX D	Increment pointer 2
2027H	INX H	Increment pointer l
2028H	DCR C	Decrement counter
2029H	JNZ 201EH	If not zero, repeat
202CH	HLT	Stop

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