Unlike conventional or extended memory, expanded memory is not directly addressable by the processor. It provides a way for computers running under DOS to access additional memory. Extended Memory Extended Memory is basically all memory above the first megabyte in a PC computer. A standard form of memory usually found in 386's, 486's, and older Pentium systems. This number refers to how many modules must be installed at any one time.
Many older machines require installation of modules in sets of two or even four at a time.
The etched silicon wafer containing the individual circuits that make up CPUs, memory modules and other components. These wafers are placed into the small black chips found on SIMMs, DIMMs, or into CPUs and other individual chips. An organization that establishes standards for memory operation, features, and packaging. Parity A bit used for error checking in the transmission of data. Indicator pins on SIMMs and DIMMs that provide speed and density information to the system using the memory module.