整个系统的硬件组成分为两个部分——最小系统板与扩展板。

The hardware components of the system are divided into two parts: minimum system board and expansion board.

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目前计算机少有支持存储器与外设之间DMA传送的商用扩展板。

Now there are few commercial expanding-boards which can support data transmitting between memorizer and peripheral equipment in computer.

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本设计采用模块化的设计思想，整个仪表分成传感器、核心板、扩展板和液晶及按键四个模块。

Based on modular design, the meter is divided into 4 modules: sensors module, main-board module, LCD and key-board module, mini-board.

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