Boots – shoes – and leggings
Patent
1981-03-02
1983-05-17
Springborn, Harvey E.
Boots, shoes, and leggings
G06F 302, G06F 306, G06F 314, G06F 1308
Patent
active
043843280
ABSTRACT:
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.
REFERENCES:
patent: 3533076 (1970-10-01), Perkins et al.
patent: 3631403 (1971-10-01), Asbo et al.
patent: 3760171 (1973-09-01), Wang et al.
patent: 3839630 (1974-10-01), Olander et al.
Reference Manual-IBM 7080 Data Processing System-Dec. 1961-Form A22-6560-1, pp. 6-18, 25-35, 82-88.
Near Charles W.
Walden Jack M.
Watson Robert E.
Griffin Roland I.
Hein William E.
Hewlett--Packard Company
Springborn Harvey E.
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