Boots – shoes – and leggings
Patent
1977-06-01
1979-05-29
Malzahn, David H.
Boots, shoes, and leggings
364200, G06F 906
Patent
active
041569172
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 calculator read-write memory unit includes a plurality of registers for storing data and a program of lines of alphameric program statements entered into the calculator from the keyboard input unit. Those registers that are not employed for storing a program are available for storing data.
REFERENCES:
patent: 3461434 (1969-08-01), Barton et al.
patent: 3596257 (1971-07-01), Patel
patent: 3760171 (1973-09-01), Wang et al.
patent: 3859635 (1975-01-01), Watson et al.
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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