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一、概述 CYBER 172的外围处理机子系统(PPS)包括十台外围处理机(PPU),共享12条输入输出(I/O)通道,分时使用多台外部设备。每个PPU有4096×13位(一位奇偶位)的MOS存储器,存取周期为400毫微秒。在SCOPE 3.4操作系统控制下,外围处理机PP 0装有系统监控程序-MTR。PP 1装有显示操作台驱动程序-DSD,其余8个PPU各装有自己的常驻程序。各PPU独立工作,执行有关的PP程序驱动外部设备,不占用CPU的时间,提高了整机效率。PPS可与CPU、CMC(中央存储控制器)和ECS(磁心扩充存储器)连接。还
I. Overview The CYBER 172’s Peripheral Processor Subsystem (PPS) includes ten peripheral processing units (PPUs) sharing 12 I / O channels and time-sharing with multiple external devices. Each PPU has 4096 × 13 bits (a parity bit) of MOS memory, access cycle is 400 nanoseconds. Under the control of the SCOPE 3.4 operating system, the peripheral processor PP 0 is equipped with the system monitor program -MTR. PP 1 equipped with display console driver-DSD, the remaining eight PPU each with its own resident program. The PPU work independently, the implementation of the relevant PP program-driven external devices, do not take up CPU time and improve the efficiency of the machine. PPS can be connected to the CPU, CMC (Central Storage Controller) and ECS (Core Expansion Memory). also