System for transferring data between I/O devices and main or expanded storage under dynamic control of independent indirect address words (IDAWs)
摘要
Enables an I/O channel program to use IDAWs (indirect data address words) to control data transfers from/to an I/O (input/output) device to/from either or both of ES (expanded storage) and/or system MS (main storage), in which data moved to/from ES does not move through MS. ES and MS are plural electronic storage media in a data processing system, and the I/O device is any I/O device selectable by the system. Intermixing of data transfers between ES and MS may be controlled by a single IDAW list accessed by a channel control word (CCW) in a channel program in a data transfer direction indicated in the CCW without any channel mode change.
申请公布号
US5461721(A)
申请公布日期
1995.10.24
申请号
US19930046679
申请日期
1993.04.14
申请人
INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
CORMIER, ROGER L.;DUGAN, ROBERT J.;FREDERICKS, KENNETH J.;GUM, PETER H.;KIM, MOON J.;PRESTON, ALLEN H.;SCHMALZ, DECEASED, RICHARD J.;WEBB, CHARLES F.;WYMAN, LESLIE W.