Clarification Guide COMPUTER SCIENCE
QualificationAccreditedA LEVELClarification GuideCOMPUTER SCIENCEH446For first teaching in 2015Subject content Clarification Version OCR 2020A Level COMPUTER ScienceSubject content clarificationA LEVELCOMPUTER SCIENCEComponent 1 The characteristics of contemporary processors, input, output and storage devices 3 Software and software development 5 Exchanging data 8 Data types, data structures and algorithms 12 Legal, moral, cultural and ethical issues 15Component 2 Elements of computational thinking 17 Problem solving and programming 19 Algorithms 22 Contents3A Level COMPUTER SCIENCE OCR 2020Subject content clarificationComponent The characteristics of contemporary processors, input, output and storage devicesComponents of a COMPUTER and their usesContent clarificationLinks to other Structure and function of the processora) The Arithmetic and Logic Unit; ALU, Control Unit and Registers (Program Counter; PC, Accumulator; ACC, Memory Address Register; MAR, Memory Data Register; MDR, Current Instruction Register; CIR).
to assembly language programs. b) The Fetch-Decode-Execute Cycle, including its effect on registers. c) The factors affecting the performance of the CPU: clock speed, number of cores, cache. d) The use of pipelining in a processor to improve efficiency. e) Von Neumann, Harvard and contemporary processor architecture.
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