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用Vissual＋＋创建动态链援库DLL．拓展了VisualBasicforWindows的功能.使VB具有访问低层端口的能力．利用标准的RS232C接口芯片INS8250．实现了PC机与单片机的双向数据传输。
Create a DLL with Vissual ++. Expands the capabilities of Visual Basic for Windows, giving VB the ability to access low-level ports. Utilize standard RS232C interface chip INS8250. Realize the two-way data transmission between PC and one-chip computer.