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To control component costs, many boards were designed with extra hardware interface circuits but the components for these circuits weren't installed and the board was left bare. The circuit was only added as an option on delivery, or could be populated later.
It is common practice for boards to include "prototyping areas", areas of the board already laid out as a solderable breadboard area with the bus and power rails available, but without a defined circuit. Several controllers, particularly those intended for training, also
==Communications and user interfaces==
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