The mast mounted sight 771 processor upgrade program

L.M. Tiberia
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Abstract

The 771 microprocessor is used as the main control processor for the Mast Mounted Sight (MMS) on the Bell Helicopter OH-58A helicopter for the US Army Advanced Helicopter Improvement Programme (AHIP). The 771 and its test set/development system were designed in January 1977. These 10-year-old designs currently have a wide range of problems in production, test, and software development. To increase system performance, lower manufacturing costs, and improve software development efforts, an upgraded 771 processor and development system has been developed. The new processor, the 771C, is implemented using ASIC (application-specific integrated circuit) and VLSI technology. The 771C increases memory and I/O capability, reduces board and part counts, and increases throughput by up to 73%. The author describes the 771C and its development system implementation performed at McDonnell Douglas Astronautics Company, Huntington Beach, California.<>
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桅杆安装瞄准具771处理器升级程序
771微处理器用于美国陆军先进直升机改进计划(AHIP)的贝尔直升机OH-58A直升机上桅杆安装瞄准具(MMS)的主控制处理器。771和它的测试装置/发展系统在1977年1月设计。这些已有10年历史的设计目前在生产、测试和软件开发中存在广泛的问题。为了提高系统性能,降低制造成本,并改进软件开发工作,已经开发了一个升级的771处理器和开发系统。新型处理器771C采用专用集成电路和VLSI技术实现。771C增加了内存和I/O能力,减少了电路板和零件数量,并将吞吐量提高了73%。作者描述了在加利福尼亚州亨廷顿海滩的麦克唐纳道格拉斯航天公司进行的771C及其开发系统实现。
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