8085 program to multiply two 8 bit numbers using logical instructions

Prerequisite – Logical instructions in 8085 microprocessor
Problem – Write a assembly language program multiply two 8 bit numbers and store the result at memory address 3050 in 8085 microprocessor.

Example –

The value of accumulator(A) after using RLC instruction is:

A = 2n*A

Where n = number of times RLC instruction is used.

Assumptions –
Assume that the first number is stored at register B, and second number is stored at register C. And the result must not have any carry.

Algorithm –

1. Assign the value 05 to register B
2. Assign the value 04 to register C
3. Move the content of B in A
4. Rotate accumulator left without carry
5. Rotate accumulator left without carry
6. Store the content of accumulator at memory address 3050
7. Halt of the program

Program –

MEMORY ADDRESS	MNEMONICS	COMMENTS
2000	MVI B 05	B <- 05
2002	MVI C 04	C <- 04
2004	MOV A, B	A <- B
2005	RLC	rotate the content of A without carry
2006	RLC	rotate the content of A without carry
2007	STA 3050	3050 <- A
200A	HLT	End of the program

Explanation –

1. MVI B 05: assign the value 05 to B register.
2. MVI C 04: assign the value 04 to C register.
3. MOV A, B: move the content of register B to register A.
4. RLC: rotate the content of accumulator left without carry.
5. RLC: rotate the content of accumulator left without carry.
6. STA 3050: store the content of register A at memory location 3050
7. HLT: stops the execution of the program.

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