The high speed serial communication of HDLC/SDLC protocol is achieved successfully in the DMA mode on XT/AT computers with its band rate up to 500k baud.

• 根据HDLC/SDLC通信规程，在XT/AT系列机上用DMA方式成功地实现了计算机间的高速串行通信，其波特率可高达500k波特。