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Random Access Memory (RAM) is tightly constrained in the least expensive, lowest-power embedded systems such as sensor network nodes and portable consumer electronics. The most widely used sensor network nodes have only 4 to 10KB of RAM and do not contain Memory Management Units (MMUs). It is difficult to implement complex applications under such tight memory constraints. Nonetheless, price and power-consumption constraints make it unlikely that increases in RAM in these systems will keep pace with the increasing memory requirements of applications.
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