Decompression calculator

Details Decompression calculator Decompression calculator

G - Physics

06

F

354/1, 354/22

G06F 17/00 (2006.01) B63C 11/32 (2006.01)

Patent

CA 1075814

ABSTRACT OF THE DISCLOSURE Apparatus for calculating and displaying dive related information is constructed in the form of a general digital com- puter that operates under software control to manipulate math- ematical decompression model of a human body in a variety of ways. The circuitry of the computer employs LSI technology and is built about a central processor unit having a characteristic complement of peripheral circuits such as PROM and RAM memories, A-D and D-A converters, I/0 devices and other circuits to attend to nor- mal housekeeping duties. Communication between the processor unit and its peripheral circuits occurs via a parallel, eiqht bit bidirectional bus. Instructions and related data defined by predetermined programs are permanently stored in the PROM memory and are retrieved and sequentially executed in response to operational command instructions input from an alphanumeric key- board. The keyboard is used in a novel matrix arrangement having its input coupled to an output port and its output feeding select- ted bits to the processor unit as coded command instructions and data words along a portion of the bus.

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