The Different Types of Memory Devices Essay - 1678 Words

The Different Types of Memory Devices This technical report will look at various different memory devices and how they are implemented in a standard computer system. Internal memory devices such as ROM, PROM, RAM, SRAM, DRAM, SIMM and DIMM will be looked at in order to give a clear idea of how each one operates, and external devices such as memory sticks will also be touched upon. Each of these devices uses different types of memory in different ways. Over the course of this report, each of the aforementioned terms will be technically defined and reasons will be established as to why there are so many memory devices within a standard computer system. Memory Devices Technically, memory is†¦show more content†¦It is used to store some of the operating system commands, and the instruction set of the computer. The data in ROM is not lost when the computer system is switched off, as it is sustained by a small long-life battery embedded within the system itself. In special purpose computers used, for example, in washing machines and video recorders, the program instructions are stored in ROM. Programmable Read-Only Memory PROM (Programmable Read-Only Memory) is ROM that can be changed only once through user activity. Once a set of instructions or program have been written to PROM, they are stored there permanently. This particular internal memory is a way of allowing a user to amend/modify a microcode program using a special machine called a â€Å"PROM Programmer† or â€Å"PROM Burner.† This machine supplies an electrical current to specific cells in the ROM that effectively blows a fuse in them. The process is sometimes known as â€Å"burning the PROM.† The difference between ROM and PROM is that a PROM is manufactured as blank memory, whereas ROM has data pre-recorded during the manufacturing process. It is also possible to get hold of EPROM (Erasable Programmable Read-Only Memory) chips, which can be cleared by exposing them to ultraviolet light, and then reprogrammed. Ordinary room lighting does not contain enough ultraviolet light toShow MoreRelatedDifference Between Compu ter Organization And Architecture1286 Words   |  6 PagesContents Q 1 .What is the difference between computer organization and architecture? 2 Q 2. Draw the components of a digital computer and identify the function(s) of the different parts. 2 Q 3. Explain the different numbering system with examples. 5 Q 4. What is the instruction set? Differentiate between direct and indirect addressing modes. 5 Q5. Explain the following function? 6 â€Æ' Q 1 .What is the difference between computer organization and architecture? 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