公开(公告)号：FR2312072A1

公开(公告)日：1976-12-17

申请号：FR7516536

申请日：1975-05-21

Applicant: IBM

Inventor： KERRIGAN MICHAEL ,  LEBIZAY GERALD ,  SORLEY OLIN LOWE MAC ,  WEISS ALFRED

IPC: G06F13/36 ,  G06F13/34 ,  G06F13/00

Abstract: 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.

公开(公告)号：DE1044163B

公开(公告)日：1958-11-20

申请号：DEI0010722

申请日：1955-09-29

Applicant: IBM DEUTSCHLAND

Inventor： SORLEY OLIN LOWE MAC

IPC: H03K5/15 ,  H04J3/04