Boxing converts a value-type to a reference-type, thus storing the object on the heap. Unboxing converts a reference-type to a value-type, thus storing the value on the stack.
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The size of the Windows 9x swap file (WIN386.SWP) is variable and is dynamically assigned.
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Saturday, April 26, 2008
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Virtual memory is disk drive space that is manipulated to seem like RAM. Software creates virtual memory by swapping files between RAM and the disk drive. This memory management technique effectively creates more total memory for the system's applications to use. When the system runs out of available RAM, it shifts data to the virtual memory swap file on the disk drive. However, because there is a major transfer of information that involves the hard disk drive, an overall reduction in speed is encountered with virtual memory operations.
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SIMM modules were traditionally available in 30-pin and 72-pin versions; DIMMs use larger 168-pin boards.
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Friday, April 25, 2008
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The most popular form of error detection in PC compatibles is parity checking. In this methodology, an extra bit is added to each word in RAM and checked each time it is used. Parity checking is a simple self test used to detect RAM read-back errors. Like refreshing, parity checking requires additional circuitry and memory overhead to operate.
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DRAM requires periodic refreshing to maintain data, even if electrical power is applied to the chip.
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