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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
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.
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公开(公告)号:CA1030267A
公开(公告)日:1978-04-25
申请号:CA225414
申请日:1975-04-22
Applicant: IBM
Inventor: LEBIZAY GERALD , KERRIGAN MICHAEL , MAC SORLEY OLIN L , WEISS ALFRED
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.
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公开(公告)号:DE2523372A1
公开(公告)日:1976-01-15
申请号:DE2523372
申请日:1975-05-27
Applicant: IBM
Inventor: KERRIGAN MICHAEL , LEBIZAY GERALD , MACSORLEY OLIN LOWE , WEISS ALFRED
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.
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