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Machine level architecture. Computer Architecture Basic units of a Simple Computer. How do we add two numbers?. Output. Program Unit. Input. (data) Memory. Accumulator. SIMCo. Inputs and Outputs. Goldman Sachs partner Dennis Suskind. Processes and Flow Charts. Start.

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## Machine level architecture

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**Machine level architecture**Computer Architecture Basic units of a Simple Computer**Output**Program Unit Input (data) Memory Accumulator SIMCo**Inputs and Outputs**Goldman Sachs partner Dennis Suskind**Processes and Flow Charts**Start Read first number Start Read second number Receive numbers to add Put first number into accumulator Do Addition Add second number to first Store sum in memory Announce Answer Print Sum Stop Stop**Read First Number**Input Output Program 017 Memory 1st number to be added 018 117 218 619 Accumulator 519**Read Second Number**Input Output Program 017 Memory 2nd number to be added 018 117 218 619 Accumulator 519**Put first number in accumulator**Input Output Program 017 Memory 018 117 218 619 Accumulator 1st Number 519**Add second number to first**Input Output Program 017 Memory 018 117 218 619 Accumulator Sum of 1st and 2nd number 519**Store sum in memory**Input Output Program 017 Memory Sum 018 117 218 619 Accumulator 519**Print Sum**Input Output Program 017 Memory 1st number to be added 018 117 218 619 Accumulator 519**Operational Codes**0 = Input 1 = Clear and Add 2 = Add 3 = Test Accumulator Contents 4 = Shift 5 = Output 6 = Store 7 = Subtract 8 = Unconditional Jump 9 = Halt and Reset**Operational Codes**9 = Input 1 = Clear and Add 2 = Add 3 = Test Accumulator Contents 4 = Shift 5 = Output 6 = Store 7 = Subtract 8 = Unconditional Jump 0 = Halt and Reset Cardiac Op Codes

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