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Full Duplex I/O Using a 3088 Channel Subsystem

IP.com Disclosure Number: IPCOM000040602D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02

Publishing Venue

IBM

Related People

Authors:
Anzick, WJ [+details]

Abstract

An I/O protocol involves the use of two separate paths, namely, a sending path and a receiving path as a single logical path for transferring data between two CPUs through an IBM 3088 channel adapter. Channel programs used with the 3088 include a PREPARE command chained to a READ or a WRITE command. The READ and WRITE commands refer to an Indirect Address List which, for each of a plurality of data segments, contains a respective start address for each data segment. In the figure, two (host) central processing units (CPUs), which are preferably IBM System/370 computers, are interconnected through a 3088 channel adaptor. Through the 3088, data from selected addresses in CPU A may be transferred to corresponding addresses in CPU B.