HSC Science (Computer Science) 12th Board ExamMaharashtra State Board
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# A block of data is stored from memory location 4501H and onwards. The length of the block is stored at memory location 4500H. Write an  Assembly Language Program to fmd the sum of block of data. Store the two byte result from memory location 4600 H. - HSC Science (Computer Science) 12th Board Exam - Computer Science 2

ConceptInstruction Set and Programming of 8085

#### Question

A block of data is stored from memory location 4501H and onwards. The length of the block is stored at memory location 4500H. Write an  Assembly Language Program to fmd the sum of block of data. Store the two byte result from memory location 4600 H.

#### Solution

 Label Mnemonics Comments LXI H, 4500 H ; Set HL pointer to 4500 H MOV C, M ; Get count in register C MVI A, 00H ; Make LSB’s of sum = 00 MOV B, A ; Make MSB’s of sum = 00 LOOP : INX H ; Set HL to point num in series ADD M ; Previous No. + Next No JNC AHEAD ; Is carry ? No, goto AHEAD INR B ; Yes, add carry to MSB’s of sum AHEAD : DCR C ; Decrement count JNZ LOOP ; Is count = 0 ? No, jump to LOOP STA 4600 H ; Store LSB’s of the sum to 4600 H MOV A, B ; Get MSB’s of sum in accumulator STA 4601 H ; Store MSBs RST 1.0 ; Restart
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#### APPEARS IN

2016-2017 (March) (with solutions)
Question 5.2.3 | 5.00 marks
Solution A block of data is stored from memory location 4501H and onwards. The length of the block is stored at memory location 4500H. Write an  Assembly Language Program to fmd the sum of block of data. Store the two byte result from memory location 4600 H. Concept: Instruction Set and Programming of 8085.
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