Real time adapter unit for use in a data processing system

Details Real time adapter unit for use in a data processing system Real time adapter unit for use in a data processing system

1979-09-06

1981-09-01

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 300

Patent

active

042875625

ABSTRACT:
A data processing system includes a central processing unit, a main store and device controllers which couple to a bus system. Each controller has a number of device adapter units. One controller includes a real time adapter unit which instead of being connected to control a peripheral device is connected to provide a timer facility for use by the central processing unit in executing tasks. The real time adapter unit includes microprocessing circuits and clock circuits. These circuits are connected to provide accurate and reliable time of day values in response to commands from the central processing unit.

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patent: 4025906 (1977-05-01), Riikonen
patent: 4100601 (1978-07-01), Kaufman et al.
patent: 4120029 (1978-10-01), Steiner
M6800 Microprocessor Application Manual, Motorola Inc., 1975, pp. 4-46 to 4-48.

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