Abstract: A technique or accessing an item of interest within a particular one of a plurality of stored representations of data is disclosed. In one embodiment, the technique is realized by having a processing device searching a plurality of stored annotations corresponding to different items within the plurality of stored representations to locate an annotation of interest corresponding to the item of interest. The annotation of interest has an associated search identifier and an associated location identifier corresponding to a location of interest within the particular one of the plurality of stored representations. The processing device then searches a plurality of stored search identifiers associated with the plurality of stored annotations to locate the search identifier and an address identifier corresponding to a location of the particular one of the plurality of stored representations within the plurality of stored representations.

Abstract: Resets on a data processing system are targeted to specific locations of that processing system and have different effects. Some resets are transparent to instruction execution while other resets will interrupt the normal execution of instructions. In addition, in a multi-zone environment resets in one zone do not automatically propagate to the other zone; instead, each zone generates its own resets.

Abstract: Method and apparatus for controlling initiating of bootstrap loading in a computer system having first and second discrete computing zones is disclosed. Each computing zone includes a status register for storing an operating system run (OSR) bit indicating that the zone has initiated bootstrap loading. A cable connects the computing zones to allow the first and second zones to read the status registers in the second and first zones, respectively. A CPU in each zone only enables initiation of bootstrap loading if the OSR bit in the other zone is not set.

Abstract: Method and apparatus for testing the operation of modules for use in a fault tolerant computing system that consists of two distinct computing zones. Diagnostic testing is performed when the system is powered on, the modules being subjected to module, zone and, if both zones are available, system diagnostic tests. Indications of faults detected during diagnostic testing are stored in an EEPROM on each module. Such fault indications can be cleared in the field by correcting the fault condition and successfully rerunning the diagnostic test during which the fault was detected. Indications of operating system detected faults are also stored in each module EEPROM. However, such fault indications are not field clearable.

Abstract: A cluster console unit for connection to a plurality of digital computer systems and high-speed mass storage systems which may be connected together to form a cluster, the cluster console unit allowing an operator to monitor operations of the systems comprising the cluster from the single console unit. The cluster console unit includes an input/output data logger which receives data through from the systems each through a separate port and stores the data in a log file. In addition the data logger transmits the data from each system to a separate communications pipe for each system and control information through a control pipe. An operator interface unit is connected to receive all of the data from all of the separate communications pipes and displays data from selected systems on a terminal screen. When the operator enters operator data for transmission to a system, the operator interface transmits the data and the identification of the system to receive the data to a operator data.