Decometer

Claim 1

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 and timing various components of the computer; a micro processor, energized by the energy source, connected to an address bus, a read-write bus, a data bus in, and a second dated bus; a clock generator for timing various components of the computer; a bus driver and status latch, timed by the clock generator and connected by the data bus in and the second data bus to the micro processor, which decodes data signals received from the micro processor and converts them to compatible voltage levels for the second and a third data bus, the status latch decoding information from the micro processor and relaying it to various memory input and output devices; a read-only memory (ROM), which has the main programs for the computer stored within it which can be addressed programmatically by the micro processor, and which makes its stored data available on the third data bus, connected to the bus driver and status latch; a first random-access memory (RAM), which can be written into by the read-write bus connected to the micro processor, which can write data into and be read by the bus driver and status latch by means of the third data bus, the memory storing program variables; a pressure sensor and A/D converter which multiplexes depth information onto the third data bus; a second random-access memory, which receives information on the address bus from the read-write data bus regarding the current depth and safe ascent depth and stores it; and a display and multiplexer which is energized by the source of energy, has as an input from the second random access memory the current depth and safe ascent depth, and receives timing pulses from the source of energy, the function of the display and multiplexer being to decode the address of the digit selected and determine the time on, or duty cycle, of each digit.