Method for Terminating I/O Device Data Transfer After Receipt of an Initial Selection Sequence From an I/O Channel
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-10
A computer I/O channel can under certain circumstances be cleared of its I/O device control Information without any notification given to the I/O device. The I/O device continues to attempt data transfer but the channel starts a new operation or tests the device for status by issuing an Initial Selection Sequence. A data transfer after this sequence may cause a Channel Error Condition. This article describes a technique for avoiding this error condition which involves detecting the initial selection during a data transfer and then terminating this transfer in an orderly manner.