8085 program to find larger of two 8 bit numbers

Problem – Write a program in 8085 microprocessor to find out larger of two 8-bit numbers, where numbers are stored in memory address 2050 and 2051, and store the result into memory address 3050.

Example –

Algorithm –

1. Load two numbers from memory 2050 & 2051 to register L and H .
2. Move one number(H) to Accumulator A and subtract other number(L) from it.
3. if result is positive then move the number(H) to A and store value of A at memory address 3050 and stop else move the number(L) to A and store value of A at memory address 3050 and stop.

Program –

MEMORY ADDRESS	MNEMONICS	COMMENT
2000	LHLD 2050	H<-(data at 2051)&L<-(data at 2050)
2003	MOV A, H	A<-H
2004	SUB L	A<-A-L
2005	JP 200D	JUMP TO 200D IF NO. IS POSITIVE
2008	MOV A, L	A<-L
2009	STA 3050	A->(in memory 3050)
200C	HLT	STOP
200D	MOV A, H	A<-H
200E	STA 3050	A->(in memory 3050)
2011	HLT	STOP

Explanation –

1. LHLD 2050: load data from memory 2050 & 2051 to register L and H.
2. MOV A, H: transfer contents of register H to A.
3. SUB L: subtract contents of register L from A and store it to A.
4. JP 200D: jump to address 200D if result is positive.
5. MOV A, L: transfer contents of register L to A.
6. STA 3050: store data of A to memory address 3050.
7. HLT:: END.
8. MOV A, H: transfer contents of register H to A.
9. STA 3050: store data of A to memory address 3050.
10. HLT: END.

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