# 8085 program to find 1’s and 2’s complement of 8-bit number

**Problem –** Write a program to find 1’s and 2’s complement of 8-bit number where starting address is **2000** and the number is stored at **3000** memory address and store result into **3001** and **3002** memory address.

**Example –**

**Algorithm –**

- Load the data from memory 3000 into A (accumulator)
- Complement content of accumulator
- Store content of accumulator in memory 3001 (1’s complement)
- Add 01 to Accumulator content
- Store content of accumulator in memory 3002 (2’s complement)
- Stop

**Program –**

Memory | Mnemonics | Operands | Comment |
---|---|---|---|

2000 | LDA | [3000] | [A] <- [3000] |

2003 | CMA | [A] <- [A^] | |

2004 | STA | [3001] | 1’s complement |

2007 | ADI | 01 | [A] <- [A] + 01 |

2009 | STA | [3002] | 2’s complement |

200C | HLT | Stop |

**Explanation –**

**A**is an 8-bit accumulator which is used to load and store the data directly**LDA**is used to load accumulator direct using 16-bit address (3 Byte instruction)**CMA**is used to complement content of accumulator (1 Byte instruction)**STA**is used to store accumulator direct using 16-bit address (3 Byte instruction)**ADI**is used to add data into accumulator immediately (2 Byte instruction)**HLT**is used to halt the program

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