[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-208286-en":3,"doc-seo-208286-105":29,"detail-sidebar-cat-0-en-105":89},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":4,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":11,"language":21,"language_code":22,"site_id":23,"html_lang":22,"table_of_contents":24,"faqs":25,"seo_title":26,"seo_description":14,"update_tm":27,"read_time":28},208286,962084928432,"Maya Linwood","https://ap-avatar.wpscdn.com/davatar_155a257f0dc6eb9ab79c44ca47cae57d",4,"Exam","GCSE Computer Science OCR J277 - Topics to revise","Revision guide for GCSE Computer Science OCR J277, focused on preparing for mock exams. Covers core topics across system architecture, memory and storage, systems software, networks, and system security. Explains key concepts such as CPU components and the fetch–execute cycle, clock speed and multi-core performance, RAM/ROM/flash and secondary storage choices, operating system functions and utility software, network types, topologies, performance factors, DNS and hosting, packet switching and protocols, plus common security threats including malware and attack categories.","GCSE Computer Science  \nOCR J277  \nAs we approach out mock exams is a good idea to begin focussing on revision. You should use Seneca Learning  \nSign up here:  \n[https://app.senecalearning.com/dashboard/class/pdg88eoxa0/assignments/assignment/a4](https://app.senecalearning.com/dashboard/class/pdg88eoxa0/assignments/assignment/a4)[ ](https://app.senecalearning.com/dashboard/class/pdg88eoxa0/assignments/assignment/a4)[d42160-d393-41ac-b0db-ed275c3a52c6](d42160-d393-41ac-b0db-ed275c3a52c6)  \nYou can also be using BBC Bite size and the Craig n Dave You Tube page if stuck.  \n􀁸  [https://www.bbc.co.uk/bitesize/examspecs/zmtchbk](https://www.bbc.co.uk/bitesize/examspecs/zmtchbk)  \n􀁸  [https://www.youtube.com/c/craigndave/playlists?view=50&sort=dd&shelf](https://www.youtube.com/c/craigndave/playlists?view=50&sort=dd&shelf) id=1 Topics to revise  \n1 System Architecture  \n􀂃 An embedded system is a type of processor designed to perform limited functions, normally one or two. They are often built into electronic machinery or devices.  \n􀂃 The purpose of the CPU is to process instructions given to a computer system. It carries out the instructions and any data that requires storage as a result is stored in the main memory.  \n􀂃 The CPU has a number of components that are involved in carrying out an instruction; these are the ALU, PC, CU, ACC, MAR and MDR, and the cache.  \n􀂃 The fetch–execute cycle is the name given to one whole cycle of processing and instruction.  \n􀂃 The clock speed of a CPU is measured in hertz. One hertz is the equivalent of one cycle per second. The greater the number of hertz available, the greater the performance of the CPU.  \n􀂃 A single-core processor can process one cycle at a time. A dual-core processor can process two cycles simultaneously. The more cores a CPU has, the more cycles it can process simultaneously and the greater the performance of the CPU.  \n􀂃 The cache is a small part of the CPU where commonly used instructions and data are stored.  \nThe more commonly used instructions and data that can be stored, the quicker the CPU can access these and the greater the performance.  \n2 Memory and Storage  \n􀂃 RAM is the place in a computer where all the programs and data that are currently in use are stored. It is volatile memory.  \n􀂃 ROM contains the programs that allow your computer to ‘boot up’. It is non-volatile memory.  \n􀂃 Flash memory is a type of non-volatile memory that is used to store data long-term.  \n􀂃 Secondary storage is any storage, either internal or external to a computer, that is not under the direct control of the CPU. There are three types: optical, magnetic and solid-state.  \n􀂃 There are several factors a user will need to consider when choosing a suitable storage device; these include capacity, speed, portability, durability, reliability and cost.  \n3 Systems Software  \n􀂃 There are two main types of software that are used on computer systems: systems software and applications software.  \n􀂃 Systems software controls the operations of hardware in a computer system. Systems software also provides a platform to run applications software.  \n􀂃 Applications software is the everyday programs we use to create documents and carry out communication with each other using technology.  \n􀂃 An operating system is software that is loaded by the computer after the initial boot-up. It controls the operations of the hardware in a computer system and manages all other software. We interact with the operating system through a user interface.  \n􀂃 The operating system performs a number of functions including memory management, multitasking, peripheral management, user management and file management.  \n􀂃 Utility software is a type of systems software. It helps manage, maintain and control the computer’s resources. There are a number of different types, including encryption software, defragmentation software, data compression and methods of backups.  \n4 Networks  \n􀂃 A network is a collection of devices that are connect","cbCaiqq1Nvavcp2o","https://ap.wps.com/l/cbCaiqq1Nvavcp2o","pdf",521249,1,"English","en",105,"# Topics to revise\n## System Architecture\n## Memory and Storage\n## Systems Software\n## Networks\n## System Security","[{\"question\":\"Which topics does the revision guide cover for OCR J277?\",\"answer\":\"It covers system architecture, memory and storage, systems software, networks, and system security.\"},{\"question\":\"What are the main ideas in system architecture section?\",\"answer\":\"It explains embedded systems, the CPU’s purpose, CPU components, the fetch–execute cycle, clock speed, and the impact of single-core versus dual-core processors and cache.\"},{\"question\":\"How does the networks section describe connectivity and communication concepts?\",\"answer\":\"It defines networks and network types (LAN/WAN), compares client–server with peer-to-peer, discusses topologies like star and mesh, and covers performance factors, packet switching, protocols, DNS, and Wi‑Fi basics.\"}]","GCSE Computer Science OCR J277 - 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