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AS and A Level: Computer Science

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  1. The Compact Disc

    However they were not very similar in appearance to the CD's we are familiar with today. When the compact disc was finally released, the decision was made that it was to contain approximately 75 minutes of playing time as this is about the same performance time as Beethoven's 9th symphony. The clear polycarbonate material used to make a CD is drawn out to just over a millimetre thick, making the CD's diameter to width ratio 100:1. I said earlier that the CD shared its practical property with the Floppy Disk. However, it also shares a characteristic with another form of sound production, the LP Record.

    • Word count: 2805
  2. Creating an Information Technology System for Chin Bookmakers

    The customer must then produce a 'Credit Account Card', which has printed on their name, date of birth, and an account number given by the bookmakers. It has also a small photograph of the customer and signature. The employee must then check last bet placed, on credit, in the credit accounts book. If the customer has adequate credit left on his/her account the entry is logged and the amount they owe is then updated. They then receive their normal betting slip along side credits receipt.

    • Word count: 2096
  3. Describe the hardware and software used to create and edit graphic images and compare the limitations of different hardware and software packages used.

    The higher you set your resolution, the smaller your icons and text, and your refresh rate drops. This may be a big limitation to graphic designers who want to make high quality graphics. Also graphics cards can also cost thousands of pounds, require a lot of space and draw a lot of power from the power supply. RAM RAM stands for random access memory, a type of computer memory that can be accessed randomly. This means that any byte of memory can be accessed without touching the preceding bytes. RAM is the most common type of memory found in computers and other devices, such as printers. RAM is used to hold the running software and graphic images.

    • Word count: 2959
  4. Future Developments in ICT

    The increases in instructions per cycle (IPC) were massive, and this was owed to a period in time where optimisations were plentiful and it was easy to spot shortcomings in architecture and design. Slowly, as Intel filled its roadmap with faster and faster processors, the speed increases were lower. Enter the age of the Pentium 4; it was here that Intel recognized that higher clock speeds could gain sizeable performance increases, and so they kept pushing up until 3.8 Ghz.

    • Word count: 2095

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