摘要:
An electrical box for mining apparatus and a mining apparatus are provided. The electrical box includes a housing having an explosion proof enclosure and a cooling duct. An electrical circuit is held in the enclosure. A fan is provided for forcing air through the cooling duct.
摘要:
An electronic calculator is provided by employing read-write and read-only memory units, a central processing unit, and an input-output control unit capable of bidirectionally transferring information between the memory or central processing units and a number of input and output units. The input and output units include a keyboard input unit and an alphanumeric display unit. The keyboard input unit includes means for entering a data entry statement into the read-write memory as part of a program of statements stored therein. The central processing unit includes logic means responsive to a data entry statement encountered during processing of a program stored in the read-write memory for controlling the alphanumeric display unit to indicate the nature of the data to be entered and thereby prompt the user as to the need for and nature of a data entry at the time such data entry is required during processing of that program.
摘要:
A modular read-write and read-only memory unit capable of employing both direct and indirect decimal and symbolic addressing, a central processing unit capable of performing both serial binary and parallel binary-coded-decimal direct and indirect memory register arithmetic, and an input-output control unit capable of bidirectionally transferring information between the central processing unit and a number of input and output units are controlled by a microprocessor included in the central processing unit. The input and output units include a keyboard input unit, a magnetic card reading and recording unit capable of bidirectionally transferring information between an external magnetic card and the read-write memory unit, and a solid state output display unit capable of displaying three lines of numeric information. The memory, central processing, input-output control, input, and output units are employed to provide an adaptable programmable calculator that may be operated manually by the user from the keyboard input unit or automatically by a program stored in the read-write memory unit. The calculator may also be employed to load programs into the read-write memory unit from the keyboard input unit, to separately transfer either data or programs bidirectionally between the read-write memory unit and an external magnetic card, and to code programs stored in the read-write memory unit as being secure when they are transferred to an external magnetic card, thereby preventing users of the calculator from re-transferring them to an external magnetic card or obtaining any indication of the individual program steps once they are reloaded into the calculator.
摘要:
An adaptable programmable calculator is provided by employing modular read-write and read-only memory units capable of being expanded to provide the calculator with additional program and data storage functions oriented towards the environment of the user, a central processing unit, and an input-output control unit capable of bidirectionally transferring information between the memory or central processing units and a number of input and output units. The memory, central processor, and input-output control units are controlled by a microprocessor included in the central processing unit. The input and output units include a keyboard input unit with a plurality of sections capable of being defined by plug-in read-only memory modules and stored programs added by the user, a magnetic card reading and recording unit capable of bidirectionally transferring information between an external magnetic card and the calculator, a solid state display unit capable of displaying every alphabetic and numeric character and many other symbols individually and in a line of one or more alphameric statements, and a printer unit capable of printing on thermally sensitive paper every alphabetic and numeric character and many other symbols individually and in alphameric statements or messages. The keyboard input unit includes a MINUS arithmetic operator key that initiates either the unary minus function or the subtraction function, as the context of an entered algebraic statement employing the MINUS arithmetic operator requires.
摘要:
An adaptable programmable calculator is provided by employing modular read-write and read-only memory units capable of being expanded to provide the calculator with additional program and data storage functions oriented towards the environment of the user, a central processing unit, and an input-output control unit capable of bidirectionally transferring information between the memory or central processing units and a number of input and output units. The memory, central processor, and input-output control units are controlled by a microprocessor included in the central processing unit. The input and output units include a keyboard input unit with a plurality of sections capable of being defined by plug-in read-only memory modules and stored programs added by the user, a magnetic card reading and recording unit capable of bidirectionally transferring information between an external magnetic card and the calculator, a display unit capble of displaying every alphabetic and numeric character and many other symbols individually and in a line of one or more alphameric statements, and a printer unit capable of printing on thermally sensitive paper every alphabetic and numeric character and many other symbols individually and in alphameric statements or messages. The keyboard input unit includes a plurality of operand keys and a plurality of operator keys for entering algebraic statements specifying selected arithmetic operations, including relational operations, into the calculator. The operations specified in a particular algebraic statement are processed in accordance with a predetermined hierarchal priority of operations, all relational operations performed last. In the event an algebraic statement being processed specifies a plurality of operations having the same hierarchal priority, that plurality of operations is processed in the order in which they were specified during entry of that algebraic statement.
摘要:
An adaptable programmable calculator is provided by employing a modular read-write and read-only memory unit capable of being expanded to provide the calculator with additional program and data storage functions oriented towards the environment of the user, a central processing unit capable of performing both serial binary and parallel binary-coded-decimal arithmetic, and an input-output control unit capable of bidirectionally transferring information between the memory or central processing units and a number of input and output units. The memory, central processor, and input-output control units are controlled by a microprocessor included in the central processing unit. A keyboard input unit with a plurality of sections capable of being defined by plug-in read-only memory modules and stored programs added by the user, a magnetic card reading and recording unit, a solid state output display unit, and an output printer unit are included among the input and output units. The calculator employs a high level algebraic keyboard language permitting the user to enter a line of one or more alphameric statements into the calculator from the keyboard input unit while visually observing an alphameric display of the line being entered to check for errors therein, permitting the user to cause the entered lines to be immediately executed by the calculator and/or stored as part of a program within the memory unit, and permitting the user to subsequently recall the executed and/or stored line, so that it may be reinspected, reevaluated and if necessary, edited and executed or reexecuted. The calculator also employs a compiler for converting each line entered into the calculator in the high level keyboard language into a past-fix polish code and an uncompiler for regenerating in the high-level keyboard language any entered line converted to the post-fix polish code. Both the compiler and the uncompiler operate on a line-by-line basis.
摘要:
An electronic calculator includes keyboard control means for enabling the user to either immediately execute a line of one or more alphanumeric statements entered into the calculator or store that entered line of one or more alphanumeric statements in the calculator memory.
摘要:
A programmable calculator having modular read-write and read-only memory units, a central processing unit, a keyboard input unit, and an output display unit, includes keys on the keyboard input unit for performing angular measurement unit conversion.
摘要:
An adaptable programmable calculator is provided by employing modular read-write and read-only memory units capable of being expanded to provide the calculator with additional program and data storage functions oriented towards the environment of the user, a central processing unit, and an input-output control unit capable of bidirectionally transferring information between the memory or central processing units and a number of input and output units. The memory, central processor, and input-output control units are controlled by a microprocessor included in the central processing unit. The input and output units include a keyboard input unit with a plurality of sections capable of being defined by plug-in read-only memory modules and stored programs added by the user, a magnetic card reading and recording unit capable of bidirectionally transferring information between an external magnetic card and the calculator, an output display unit capable of displaying every alphabetic and numeric character and many other symbols individually and in a line of one or more alphameric statements, and a printer unit capable of printing on thermally sensitive paper every alphabetic and numeric character and many other symbols individually and in alphameric statements or messages. The calculator includes a multiplicity of programmable boolean flag variables that may be designated from the keyboard input means and employed as part of an alphameric statement. Selected ones of the boolean flag variables may be manually set from the keyboard at any time during execution of a program stored in the read-write memory. A dedicated one of the boolean flag variables is automatically set by the calculator when a mathematically incorrect program statement or an arithmetic underflow or overflow is encountered during program execution.
摘要:
An adaptable programmable calculator is provided by employing a modular read-write and read-only memory unit capable of being expanded to provide the calculator with additional program and data storage functions oriented towards the environment of the user, a central processing unit capable of performing both serial binary and parallel binary-coded-decimal arithmetic, and an input-output control unit capable of bidirectionally transferring information between the memory or central processing units and a number of input and output units, such as a keyboard and an output display unit. The memory, central processor, and input-output control units are controlled by a microprocessor included in the central processing unit.Data storage registers within the calculator memory may be addressed directly by the computed integral value of an arithmetic expression that may in turn incorporate the contents of one or more similarly addressed data storage registers, thus facilitating efficient fetching and storing of information, as well as matrix operations and manipulation of files. A plurality of dedicated data storage registers having fixed labels and locations within the calculator memory may, by single key actuations on the part of the user, be called into a displayed algebraic expression, the contents of which are then manipulated in accordance with the algebraic expression.