Hewlett-Packard Company

Other

Alexander D Walker

France Rode

William L Crowley, Jr

David S Cochran

A computer terminal including a printer including a heat sensitive sheet across which a thermal head having a vertical column of resistors can move with appropriate electrical energization controlled by a keyboard to effect character printing on the sheet, and also to generate a coded output for transmission to and from a computer at a central station.

Computer terminal

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 a prefix 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.

General purpose calculator having keys with more than one function

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.

Growing community of inventors

San Francisco, CA, United States of America

Alexander D Walker