There was a time not many years ago when 3U-size processor boards were among the smallest embedded computers imaginable. This form factor, 100 by 160 millimeters, or about the size of a paperback novel, opened a multitude of new applications for embedded computing, such as avionics for large unmanned vehicles, electronic subsystems for armored combat vehicles (vetronics), and portable electronics for soldiers on the battlefield. In that era, 6U computer boards were the standard, and 3U circuit cards were amazingly small.
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机译：3U大小的处理器板曾是可想象的最小的嵌入式计算机之一。这种尺寸为100 x 160毫米（约等于平装小说）的尺寸为嵌入式计算打开了许多新的应用程序，例如大型无人飞行器的航空电子设备，装甲战车的电子子系统（电子设备）以及便携式电子设备。战场上的士兵。在那个时代，6U电脑板是标准配置，而3U电路卡则小得惊人。
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