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    • 4. 发明授权
    • Input/output port control
    • 输入/输出端口控制
    • US3996564A
    • 1976-12-07
    • US483464
    • 1974-06-26
    • Michael KerriganGerald LebizayOlin Lowe MacSorleyAlfred Weiss
    • Michael KerriganGerald LebizayOlin Lowe MacSorleyAlfred Weiss
    • G06F13/36G06F13/34G06F13/00
    • G06F13/34
    • An input-output port control subsystem for use with a computer system having separate source and destination buses incorporated therein. Said system including circuitry for controlling operations of said system and said input/output subsystem, said subsystem including a bidirectional input/output bus for transferring data to and from said system, and separate gating means for selectively connecting said source and destination buses to said bidirectional I/O bus. External devices are connected to said bus thru an adaptor unit which is directly connected to said processing system by appropriate control lines. The input/output subsystem is adapted to operate either under programmed I/O control mode thru the central processing system or in cycle steal mode wherein the I/O devices themselves request cycle steal service time on the I/O bus thru their connected adaptor.
    • 一种用于与其中并入有独立的源和目的地总线的计算机系统一起使用的输入 - 输出端口控制子系统。 所述系统包括用于控制所述系统和所述输入/输出子系统的操作的电路,所述子系统包括用于将数据传送到所述系统和从所述系统传送数据的双向输入/输出总线,以及用于选择性地将所述源和目的地总线连接到所述双向 I / O总线。 外部设备通过适配器单元连接到所述总线,适配器单元通过适当的控制线直接连接到所述处理系统。 输入/输出子系统适用于通过中央处理系统或周期窃取模式的编程I / O控制模式,其中I / O设备本身通过其连接的适配器在I / O总线上请求周期窃取服务时间。