Memory Types and Forms
Physical forms of RAM have changed greatly over the years since the first IBM PC was introduced. Throughout the 1980s, most systems used individual memory chips in capacities ranging from 64KB to 1MB. In the late 1980s, memory modules (multiple memory chips on a miniature board that we know today as SIMMs, DIMMs, and RIMMs) became popular, and this type of memory is still the standard today, although specific forms and capacities are changing rapidly.
The same physical form (chip or module) can be used for RAM with different speeds, types, and sizes. Memory also can be purchased in forms that enable the system to detect or even correct memory errors.
To specify the correct memory for any given system, you must choose the ...
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