Boots – shoes – and leggings
Patent
1977-06-01
1979-05-01
Malzahn, David H.
Boots, shoes, and leggings
G06F 748
Patent
active
041527739
ABSTRACT:
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.
REFERENCES:
patent: 3380031 (1968-04-01), Clayton et al.
patent: 3588841 (1971-06-01), Ragen
patent: 3720820 (1973-03-01), Cochran
patent: 3996562 (1976-12-01), Reach et al.
Covington Wayne F.
James Rex L.
Larson Ivar W.
Olander Jr. Emil E.
Russell Homer C.
Hein William E.
Hewlett--Packard Company
Malzahn David H.
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