这一设计明显的缺点是所有的进程都能访问帧缓冲，所以很容易导致显示问题，而且在不同应用程序间的同步绘图十分困难。
The obvious disadvantage to this was that all processes had access to the frame buffer, so could corrupt the display easily and synchronizing drawing between applications was very difficult.
本论文采用的USB这种传输方式，克服了以往绘图机利用并行电缆带来地低速、迮线复杂等种种缺点，为绘图机的数据传输提供了一种崭新的新型接口。
The data transfer of USB used in this paper conquers some disadvantages, such as low speed, complex of connecting and so on, providing a new pattern interface for the data transfer of plotter .
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