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A Recovery Cache for the PDP-11

Lookup NU author(s): Professor Pete Lee, Keith Heron



Backward error recovery is an integral part of the recovery block scheme that has been advanced as a method for providing tolerance against faults in software; the recovery cache has been proposed as a mechanism for providing this error recovery capability. This paper describes a recover cache that is being built for the PDP-11 family of machines. This recovery cache has been designed to be an ""add-on"" unit which requires no hardware alterations to the host CPU but which intersects the bus between the CPU and the memory modules. Specially designed hardware enables concurrent operation of the recovery cache and the host system, and aims to minimise the overheads imposed on the host. The paper describes the design of the recovery cache and the new instructions which have (conceptually) been added to the host CPU, and provides an overview of the software necessary to control the device.

Publication metadata

Author(s): Lee PA, Ghani N, Heron K

Publication type: Report

Publication status: Published

Series Title: Computing Laboratory Technical Report Series

Year: 1979

Pages: 10

Print publication date: 01/03/1979

Source Publication Date: March 1979

Report Number: 134

Institution: Computing Laboratory, University of Newcastle upon Tyne

Place Published: Newcastle upon Tyne

URL: .A Recovery Cache for the PDP-11