Computing Exam Revision: Retake

Computing Exam Revision: Retake

1. IDE:

   • Editor
     • Allows the user to enter the program. As well as this it colour codes the keywords. Also it auto completes code as you type.
   • Compiler/Interpreter
     • This translates the source code (Code you've written) into machine code, for example; binary.
   • Debugger
     • A debugger points out errors, then suggests how to fix it.

2. High Level Code

   • Uses interpreters and compilers, designed for humans to understand.
     • For example: Python, Javascript and Scratch.

3. Machine Code

   • Machine code is made up of hexidecimal instructions designed for computers to understand.
     • For example: Hexidecimal, Binary and Assembly code.
       • Hexadecimal
         • Hexadecimal values: 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F
           • There are 16 values (16-Base) in hexadecimal, therefore to convert hexadecimal number to denary.
             • Its simpler to remember large numbers in hex as they're far shorter than binary numbers.
       • Assembly Code
         • Shortened command words such as “LDA”, “DAT”, “ADD” and “OUT”.
       • Binary
         • When converting denary into hexadecimal you have to split the binary numbers into nibbles (4's)
           • After that you have to add up each nibble which makes up the hexadecimal number.

4. Networks

   • LAN
     • Computers which are connected together over a small geographical area.
     • Advantages
       • You can share files to people who are connected
       • You can log onto any computer/ device connected
   • WAN
     • Computers which are connected together over a large geographical area
   • Additional Hardware:
     • Switch: this enables all of the computers to connect to the network
       • Access Point: Extends the wireless signal, allowing files to be shared and accessed from a longer distance.
         • Server: The files and logins can be accessed from a central point.
   • Client Server network
     • The information and files are stored on the server and arent on the computer which allows anyone with a user account to logon on any device.

5. Software

   • Functions of an operating system
     • User Interface
     • Security
     • Peripheral Management
     • Memory Management
     • Multi-Tasking
     • File Management
   • Utility Programs
     • Anti-Virus
       • Scans your system files for malicious software.
     • System Cleanup
       • Searches for and deletes files/programs no longer used, for example; Temporary files and Installation files.
     • Diagnosis Utility
       • Attempts to detect/resolve items that are not working correctly
     • Disk formatting
       • Deletes all files from your hard drive, including system, programs and files.
     • Firewall
       • Controls access to the computer through the network.
     • System Information
       • Displays important information about the current state of the computer.
     • Automatic Update
       • Checks the manufacturers website on the internet and checks/installs the new versions.
     • Disk Defragmenter
       • Moves files around that all parts of a file are stored together.

Images and files in the map