公开(公告)号：US3778779A

公开(公告)日：1973-12-11

申请号：US3778779D

申请日：1972-04-28

Applicant: IBM

Inventor： HAKE V ,  MCDOWELL A ,  STILWELL S ,  MERSEL D ,  MOSHER L

IPC: G06F3/12 ,  G06F13/00 ,  G06F13/12 ,  H04L13/08 ,  G06F3/00

CPC classification number: G06F13/122 ,  H04L13/08

Abstract: A new logic and storage circuit is provided for a terminal device such as a display or printer used in a data processing system. The circuit includes a shift register that is interconnected with a control unit by a coaxial cable or other two conductor system for transferring serial messages to the control unit and for receiving serial messages from the control unit. The register is connected in parallel with other components of the terminal device. The logic and storage circuit is provided with means for detecting data bits on the two conductor message line and for forming data bits on the line in response to the contents of the register. Means is also provided for decoding control word messages from the control unit and for receiving data messages or transmitting data or status word messages from the terminal device to the control unit.

Abstract translation: 为诸如在数据处理系统中使用的显示器或打印机的终端设备提供了新的逻辑和存储电路。 该电路包括移位寄存器，该移位寄存器通过同轴电缆或其它两个导体系统与控制单元互连，用于将串行消息传送到控制单元并用于从控制单元接收串行消息。 寄存器与终端设备的其他组件并联连接。 逻辑和存储电路提供有用于检测两条导线消息线上的数据位并用于响应寄存器的内容在线上形成数据位的装置。 还提供了用于从控制单元解码控制字消息并用于从终端设备接收数据消息或发送数据或状态字消息到控制单元的装置。