8085 program to find maximum and minimum of 10 numbers

Problem – Write an assembly language program in 8085 microprocessor to find maximum and minimum of 10 numbers. 

Example –

Minimum: 01H,  Maximum: FFH

In CMP instruction:
If Accumulator > Register then carry and zero flags are reset 
If Accumulator = Register then zero flag is set 
If Accumulator < Register then carry flag is set 

Assumption – List of numbers from 2050H to 2059H and output at 2060H and 2061H. 

Algorithm –

1. Maximum number is stored in B register and minimum in C register
2. Load counter in D register
3. Load starting element in Accumulator, B and C register
4. Compare Accumulator and B register
5. If carry flag is not set then transfer contents of Accumulator to B. Else, compare Accumulator with C register, if carry flag is set transfer contents of Accumulator to C
6. Decrement D register
7. If D>0 take next element in Accumulator and go to point 4
8. If D=0, store B and C register in memory
9. End of program

Program-

Address	Label	Instruction	Comment
2000H		LXI H, 2050H	Load starting address of list
2003H		MOV B, M	Store maximum
2004H		MOV C, M	Store minimum
2005H		MVI D, 0AH	Counter for 10 elements
2007H	LOOP	MOV A, M	Retrieve list element in Accumulator
2008H		CMP B	Compare element with maximum number
2009H		JC MIN	Jump to MIN if not maximum
200CH		MOV B, A	Transfer contents of A to B as A > B
200DH	MIN	CMP C	Compare element with minimum number
200EH		JNC SKIP	Jump to SKIP if not minimum
2011H		MOV C, A	Transfer contents of A to C if A < minimum
2012H	SKIP	INX H	Increment memory
2013H		DCR D	Decrement counter
2014H		JNZ LOOP	Jump to LOOP if D > 0
2017H		LXI H, 2060H	Load address to store maximum
201AH		MOV M, B	Move maximum to 2060H
201BH		INX H	Increment memory
201CH		MOV M, C	Move minimum to 2061H
201DH		HLT	Halt

Explanation –

1. One by one all elements are compared with B and C register.
2. Element is compared with maximum, if it greater than maximum then it is stored in B register. Else, it is compared with minimum and if it is less than minimum then it stored in C register.
3. Loop executes 10 number of times.
4. At the end of 10 iterations, maximum and minimum are stored at 2060H and 2061H respectively.

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