Hardware: Computer Memory
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Memory is the brain of a computer which stores
information and instructions for immediate process in the computer. Computer
memory operates at a high speed.
Computer Memory
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| Memory |
1. SIMM – Single Inline Memory Module. They may have DIPs on one or both sides and will have 30 or 72 pins. They normally are available in the 72 pins size which supports a 32 bit data transfer between the microprocessor and the memory.
Read: Computer Concepts
2. DIMM – Double Inline Memory Module. The modules have 168 pins and support a 64 bit data transfer between the microprocessor and the memory. Synchronous Dynamic Access Memory (SDRAM) is the type of memory that is found on DIMM packages. The term SDRAM describes the memory type, and the term DIMM describes the package. These modules are available in 3.3 or 5 volt types and buffered or un-buffered memory. The most common choice for today’s motherboards is 3.3 volt un-buffered DIMMs.
Cache Memory
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| Cache Memory |
Cache memory is special memory that operates much faster than SDRAM memory. It is also more expensive. Cache memory lies between the microprocessor and the system RAM. It is used as a buffer to reduce the time of memory access. There are two levels to this memory called L1 (level 1) and L2 (level 2). The level 1 memory is a part of the microprocessor, and the level 2 memory is just outside the microprocessor.
Terms
Bit – A logical data unit which has a possible value of 0 or 1.Byte – A unit of data storage consisting of 8 bits.
Cycle – An electrical cycle is basically a sine wave form during which electrical voltage will cycle from its lowest negative value to its highest positive value and back again. Computer hardware – Refers to the various electronic components that are required for you to use a computer along with the hardware components inside the computer case.
Hertz – A unit of frequency describing the number of electrical cycles that occur in a second. One hertz is one cycle per second. Power is delivered to homes in the United States at 60Hz and in Europe at 50Hz.
Megabyte (Mb) – A unit of data storage consisting of about one million bytes. This is normally used to refer to the amount of system memory or floppy disk storage.
Megahertz (Mhz) – A unit of frequency. It is one million hertz. It describes the clock frequency the microprocessor runs at. The larger the number, generally the faster the microprocessor, but there are other factors that affect microprocessor speed.
Gigabyte (Gb) – A unit of data storage consisting of about 1000 megabytes. This is normally used to refer to the amount of capacity a hard drive has.
RAM – Random Access Memory.
Definitions
=> Pin – A part of a connector that extends outward to extend into and make contact with a socket. Referred to as the male side of a connector.=> Socket – A part of a connector that contains an internal contact to receive the extended side (pin) of a connector. Referred to as the female side of a connector.
=> Jack – A receptacle where power of signal connectors may be plugged into. These are usually on the case of a computer or the motherboard and are made to receive plugs from devices such as keyboards.
=> Plug – The part that connects with the jack, which comes from a keyboard, mouse, monitor or other device. This is the side associated with a cable.
Also Read: Hardware - Computer Components
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