System 360/370 Select Out/In Bypass Function With Driver and Receiver in One Chip
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2005-Jan-27
An Integrated Select Out Bypass (ISOB) chip is disclosed that performs the Select Out and Select In control for a single IBM System 360 and System 370 I/O Interface. The Control Unit attached to the System 360/370 Channel Interface uses the Select Out signal to detect the start of a selection sequence from the Channel. Unlike the other interface lines, Select Out is not only received by each Control Unit but passes through logic and is (Image Omitted) re-driven to the next Control Unit attached to the Channel. The ISOB function provides an electrical bypass for the Select Out/Select In signal when the Control Unit is powered off.