Monitoring system for a modular digital data processor

Details Monitoring system for a modular digital data processor Monitoring system for a modular digital data processor

1979-10-16

1982-04-20

Shaw, Gareth D.

Boots, shoes, and leggings

371 21, G06F 1128

Patent

active

043262660

ABSTRACT:
Internal states of storage devices within a modular digital data processing system are made accessible using variable mode multi-bit shift register storage devices in each module. The inputs and outputs of the shift register storage devices in each module are interconnected by gating means within the module which may be selectably controlled to form separately selectable serial strings along which the bits of a selected string of a selected module may be caused to be shifted to a monitoring unit for monitoring, diagnosing and/or correcting purposes and then returned, via the string, to their original locations in the shift register storage devices of the selected module, after which normal data processing operations can be resumed, or other appropriate action taken. At least one string in each module is formed of monitoring storing devices which are not involved in data processing operations so as to permit the module to be monitored simultaneously with the performance of data processing operations.

REFERENCES:
patent: 4048481 (1977-09-01), Bailey, Jr. et al.
patent: 4100605 (1978-07-01), Holman

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