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Human Computer Interface


             1.2 Hard Drives.
             A few years back the average hard drive was about 5GB now the smallest one you can buy is 20GB. This is because of the demand of the user requiring more space on their drive to store data. Many applications take up a lot of hard disc space. On the whole games can take up on the average hard disc the most disc space. One example is The Sims this game requires 300MB. This does not include the space you will require to save games and install add-ons etc. If the average hard drive were 5GB users would be filling them up really quickly. Another trend that has probably lead to the average size of a hard drive being increased is that increasingly more and more people download music off the Internet rather than purchasing the CD or cassette.
             1.3 Memory.
             There are many different types of memory. They have changed over the years here are some below.
             SDRAM: this stands for Synchronous Dynamic Ram. This uses two techniques Interleaving and Burst. Interleaving is when the memory is split into 2 to 4 blocks. One block holds the memory while the other is working. Burst when the input of data into the memory is a continuous process.
             VRAM: Is a variation of DRAM chips. Normal data writes the operations, there is a constant sequential reading that occurs at the same time.
             WRAM: Stands for Windows RAM this is used especially for video cards.
             EDO RAM: Extended Data Output RAM is used both for main memory and in video cards as a replacement for VRAM. The data is still available, as the chip is getting ready for the next access. Moving the data this way reduces the access delay as a data transfer can take place in 1 clock cycle where as it normally would take 2.
             DDRAM: Double Data Ram was originally developed for a video card DDR is a type of SDRAM that is cost effective for main memory.
             RDRAM: Rambus Dynamic RAM is a fast local bus between the CPU, the devices that are connected to the computer. RDRAM has a greater data transfer rates than DRAM.


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2. What are the characteristics of a "good" user interface?

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