GCE Computer Science Unit H446A/01: Computer systems Advanced GCE Mark Scheme for June 2018

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GCE Computer Science Unit H446A/01: Computer systems Advanced GCE Mark Scheme for June 2018 Question Answer Mark Guidance 1 a i - (Single) Control Unit - (Single) Arithmetic Logic Unit ... - (Special) registers within CPU - Instructions and Data stored in same area of memory - Instructions and Data stored in same format - A single set of buses / same bus for instructions & data (to connect CPU to Memory and I/O) (1 Mark per -, Max 2) Answer Mark Guidance b i Input Green Light Red Light 1  2  3  4  5  6  7  8  9  Rows 1-4 correct 1 Mark Rows 5-9 correct 1 Mark 2 (AO3.3) Accept T for a tick. Penalise if blank table elements have content. ii - The value 11 is stored in the MAR. - 11 is sent down the address bus. - A read signal is sent down the control bus. - 0 is sent (back from memory) down the data bus. - 0 is stored in the MDR… - …and then copied to the ACC (1 Mark per -, max 6) [Show More]

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