Registers – Transfer mechanism – Traveling pawl
Patent
1975-09-25
1977-01-25
Smith, Jerry
Registers
Transfer mechanism
Traveling pawl
73432R, 128 21R, 23515132, G06F 1542
Patent
active
040052826
ABSTRACT:
A portable decompression computer, which is capable of providing a diver's current depth and safe-ascent depth, comprising a source of energy, for energizing various components of the computer. A micro processor is energized by the energy source. A clock generator times various components of the computer. A bus driver and status latch, timed by the clock generator and connected to the micro processor, decodes data signals received at its input and converts them to compatible voltage levels as output signals. The status latch decodes information from the micro processor and relays it to various memory input and output devices. A read-only memory (ROM), which has the main programs for the computer stored within it, can be addressed programmatically by the micro processor. A first random-access memory (RAM), connected to the micro processor, can write data into and be read by the bus driver and status latch, the memory storing the program variables. A pressure sensor and A/D converter which multiplexes depth information onto the bus driver and status latch. A second random-access memory receives information on a read-write bus regarding the current depth and safe ascent depth and stores it. A display and multiplexer has as an input the current depth and safe ascent depth, its function being to decode the address of the digit selected and determine the time on, or duty cycle, of each digit, and to display the digit.
REFERENCES:
patent: 3415247 (1968-12-01), Louvel et al.
patent: 3457393 (1969-07-01), Stubbs et al.
patent: 3681585 (1972-08-01), Todd
patent: 3746850 (1973-07-01), Moore et al.
patent: 3886801 (1975-06-01), Hills
L. Altman, "Single-Chip Microprocessors Open Up a New World of Applicatio, Electronics, Apr. 18, 1974, pp. 81-87.
Johnston Ervin F.
Sciascia Richard S.
Smith Jerry
Stan John
The United States of America as represented by the Secretary of
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