IBM3274/76接口电路的集成化已经把必要的全部功能集中到一个芯片上。由标准微系统公司(SMC)研制的COM9004以18MHz的主时钟频率工作,只需一同轴电缆驱动器来为IBM3274/76控制部件与3278、3287和3289终端设备之间提供接口。它也可用作一个完备的收发机。在有关的研制中,SMC已减少了实现MIL-STD-1553B数据—通信规约中所需要的芯片数目。COM The integration of the IBM 3274/76 interface circuit has all the necessary functions to be centralized on a single chip. Developed by Standard Microsystems (SMC), the COM9004 operates at a master clock frequency of 18 MHz, requiring only one coaxial cable driver to interface the IBM 3274/76 control unit with the 3278, 3287, and 3289 end devices. It can also be used as a complete transceiver. In related developments, SMC has reduced the number of chips required to implement the MIL-STD-1553B data-communications protocol. COM