公开(公告)号：AU7415481A

公开(公告)日：1982-02-16

申请号：AU7415481

申请日：1981-07-02

Applicant: NCR CORP

Inventor： CHARI V ,  COSTA J L

IPC: G06F9/22 ,  G06F3/00 ,  G06F13/22 ,  G06F13/38 ,  H04L69/14

Abstract: A data processing system including processing elements (22) and a central memory (10) has an input/output system for handling high data transmission rates comprising an I/O processor (23) providing serial lines (31) to a plurality of peripheral subsystems (30) each of which comprises a peripheral adapter (40) and a plurality of peripheral devices (41), the peripheral adapter including a first means providing serial/parallel data conversion from the serial line (31), a second means providing control functions and information transfer to the peripheral devices, and third means for responding to the I/O processor in accordance with a message protocol. The message protocol involves interrogating an input signal indicating the end of a message from I/O processor (23), determining the message type, transmitting a response message and causing the peripheral adapter to enter an operating state which may involve further exchange of messages with the I/O processor.