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Processor To Processor Direct Memory Access Write in a Closed Ring Data Transmission Loop

IP.com Disclosure Number: IPCOM000052856D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11

Publishing Venue

IBM

Related People

Authors:
Darman, AP Weiss, L [+details]

Abstract

A remote processor connected to a data transmission loop having multiple processors connected to it can place data into another processor's storage at a storage location specified by the remote processor. Implementation in the IBM Series/l data transmission loop environment required the addition of three I/O commands to the Series/1 channel command set: "non-specific read' to subchannel 1, "unsolicited data/data end' and "solicited data/data end' to subchannel 2. These are under control of modifier bits 8 through 11 of the device control block (DCB) control word. The standard data/data end and read commands remain unchanged in their definition and operation.