Registers – Transfer mechanism – Traveling pawl
Patent
1974-10-10
1976-03-23
Malzahn, David H.
Registers
Transfer mechanism
Traveling pawl
G06F 1530
Patent
active
039462188
ABSTRACT:
A battery-powered, hand-held, calculator employs MOS/LSI calculator circuits to perform arithmetic and financial calculations. Data and commands are input to the calculator from a keyboard having shift key to double the functions of selected keys. A 15-digit, seven-segment light emitting diode (LED) display serves as the output for the calculator. The calculator circuits include a read-only memory circuit in which the algorithms for performing the arithmetic and financial calculations are stored; a control and timing circuit for scanning the keyboard, retaining status information about the condition of the calculator or of an algorithm, and generating the next read-only memory address; and an arithmetic and register circuit containing an adder, a group of working registers, a group of data storage registers forming a stack for roll down operation, and a constant storage register. These circuits are interconnected by a multiple line buss system.
REFERENCES:
patent: 3533078 (1970-10-01), Perkins et al.
patent: 3631403 (1971-12-01), Asbo et al.
patent: 3720820 (1973-03-01), Cochran
patent: 3760171 (1973-09-01), Wang et al.
Cochran David S.
Crowley, Jr. William L.
Rode France
Walker Alexander D. R.
Hewlett--Packard Company
LaRiviere F. David
Malzahn David H.
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