8905723
Description
Flashcards by Nathan Blake, updated more than 1 year ago
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Created by Nathan Blake
over 8 years ago
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| Question | Answer |
| Hardware | - Input Devices - Output Devices - CPU -Primary Storage - Secondary Storage |
| CPU Factors | - Cache - Cores -Clock Speed |
| Cache | The higher the faster. More instructions can be stored on the faster memory rather than RAM/HDDs |
| Cores | The higher the faster. The amount of instructions that can be carried out at once |
| Clock Speed | The higher the faster. The amount of instructions that can be carried out per second |
| RAM | Random Access Memory. Volatile. Stores instructions for the CPU before they're moved to cache |
| ROM | Read Only Memory. Can only be read from not written to. Initial instructions are stored here to boot the system |
| HDDs | - Cheap per unit of storage - Store a lot But - Moving parts can break easily - Noisy - Slow - Hot |
| Optical Drives (DVDs, CDs) | - Cheap per unit of storage - Media is not as easy to break - Portable But - The drive can break - Noisy - Slow - Not a lot of storage |
| Solid State (SSDs, USB Drives) | - No moving parts - Versatile - Fast - Robust But -Expensive - Can Corrupt |
| ASCII | 7 Bits (8 If extended ASCII). A certain code is represented as text, a number or a symbol. |
| Unicode | 32 bits. Has a wide set of symbols and other languages to communicate to others around the world. |
| Images | Each pixel is a binary number. The higher the binary number for 1 pixel, The better the colour of the image. |
| Resolution | Amount of pixels in one image (PPI - Pixels per inch) |
| Sound | Samples of sound are taken at regular intervals. The computer takes a reading of where the sound wave is and the value is stored as a binary depending on the bit rate of the file. |
| Sample Rate | Amount of times, per regular interval, the computer saves sound. |
| Bit rate | The quality of sound (More bits = More quality) |
| Variable | A location in memory that can store a changeable value |
| Constant | A location in memory that stores a value that doesn't change whilst the program is running |
| Array | A location in the memory which stores a set of data of the same type of grouped together that can be accessed. |
| Parameters | Every function has parameters. These are, in essence, variables for the function to use. (These are inside the brackets on the end of a function) |
| Data types | Float String Decimal |
| Float | Can also be real or double. Stores numbers to be used with maths. |
| String | Used to store text or numbers that do not require maths |
| Decimal | Stores a number to have maths performed on but uses decimal points instead of whole numbers |
| Errors | Syntax Runtime Logic |
| Syntax | When the programmer does not follow the rules of the language. Found before the program is run. |
| Runtime/Logic | An error caused by something to do with the way the program was coded. |
| Testing | White box Black Box Unit testing Trace tables |
| White Box | Observing individual parts and running small parts testing it with unexpected inputs |
| Black Box | Ensures the the program would work for what the user would normally do. |
| Unit Testing | Testing individual parts of the code to ensure that it is working as expected. For example, testing a function to rule out other issues with the program |
| Database Terms | Table Field Record Query Primary/Foreign Keys |
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