Processor To Processor Direct Memory Access Write in a Closed Ring Data Transmission Loop
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
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.