Replace the mainboard , use original CPU module with the replacement mainboard.

更换主板。尝试在更换主板上使用原始的CPU 模块。

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The forth chapter introduces the mainboard's hardware design of tax controlled receiver. The mainboard contains common facility, such as CPU, LCD drive, FLASH, serial interface , and so on.

第四章详细介绍了税控收款机主板的硬件设计，主板包括CPU、LCD液晶驱动、FLASH、串口等常用的外设。

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