Boots – shoes – and leggings
Patent
1977-06-01
1979-08-07
Malzahn, David H.
Boots, shoes, and leggings
364768, G06F 750
Patent
active
041640390
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 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.
REFERENCES:
patent: 3597600 (1971-08-01), Herendeen
patent: 3760171 (1973-09-01), Wang et al.
patent: 3762637 (1973-10-01), Hernandez
patent: 3859635 (1975-01-01), Watson 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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