Browse Prior Art Database

Long Branch Control

IP.com Disclosure Number: IPCOM000068615D
Original Publication Date: 1978-Jan-01
Included in the Prior Art Database: 2005-Feb-20

Publishing Venue

IBM

Related People

Authors:
Dumstorff, EF Hammer, WE Kerr, DJ [+details]

Abstract

Control storages, particularly those used in input/output (I/0) controllers, are becoming larger in size as to the number of words stored, but the width of the words generally has not increased. Conditional branching is thus normally limited to particular sections of storage because the branch condition field occupies bit positions which could otherwise be used for the branch address. This limitation is overcome by providing control apparatus, together with storage paging logic, for modifying all of the control storage address bits. The control apparatus additionally permits interrupts to occur during the branch operation, and the partially completed branch will be completed upon return to the associated program level.