Louis T Schulte

US Patent:

41808541, Dec 25, 1979

Filed:

Sep 29, 1977

Appl. No.:

5/837771

Inventors:

Jack M. Walden - Loveland CO
William D. Eads - Loveland CO
Ray J. Cozzens - Loveland CO
John L. Bidwell - Loveland CO
Robert A. Jewett - Loveland CO
Martin S. Wilson - Loveland CO
Daniel J. Griffin - Loveland CO
Robert E. Kuseski - Loveland CO
Louis T. Schulte - Loveland CO

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G06F 302
G06F 314

US Classification:

364200

Abstract:

A programmable calculator employs modular read-write and read-only memories separately expandable to provide additional program and data storage functions within the calculator oriented toward the environment of the user and two sixteen bit LSI NMOS central processing units. One of the central processing units (LPU) is employed to perform language syntaxing, arithmetic, and general supervision of program execution. The second central processing unit (PPU) is employed for managing input/output operations. Communication between the two central processing units is accomplished by an arrangement through which the two central processing units share a common portion of memory. The calculator also includes a keyboard having a full complement of alphanumeric keys for entering programs and data into the calculator and for otherwise allowing the user to control operation of the calculator. The calculator further includes a CRT that can be operated in either an alphanumeric mode or a graphics mode, two magnetic tape transports that permit the user to store information into and to retrieve information from the user portion of the calculator read-write memory, and an 80-column thermal printer utilizing a print head that includes 560 thermal print resistors arranged in a single horizntal row.

US Patent:

41569210, May 29, 1979

Filed:

Apr 28, 1976

Appl. No.:

5/680837

Inventors:

Freddie W. Wenninger - Loveland CO
Donald E. Morris - Loveland CO
Jindrich Kohoutek - Loveland CO
David S. Maitland - Loveland CO
Douglas M. Clifford - Loveland CO
Louis T. Schulte - Loveland CO
John C. Keith - Loveland CO

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G06F 302
G06F 312
G06F 314

US Classification:

364744

Abstract:

An adaptable calculator is provided by employing five MOS/LSI circuits interconnected by a multiple line bus system. They include (1) a read-only memory circuit group; (2) a control and timing circuit; (3) an arithmetic and register circuit; (4) a data storage circuit; and (5) an input/output (I/O) circuit. Input and output units include a keyboard input unit and an 18-column output printer unit. An optional LED display unit may be plugged into the calculator mainframe. The keyboard input unit includes an AUTO DECIMAL POINT key for selecting an automatic decimal point mode of calculator operation in which the calculator automatically places the decimal point at a specified location in all entered data. Thus, the operator need not manually enter the decimal point in entered data. The calculator may be operated manually by the user from the keyboard input unit or automatically by a program stored in the calculator memory.

US Patent:

44556187, Jun 19, 1984

Filed:

Feb 20, 1981

Appl. No.:

6/236394

Inventors:

Jack M. Walden - Loveland CO
William D. Eads - Loveland CO
Ray J. Cozzens - Loveland CO
John L. Bidwell - Loveland CO
Robert A. Jewett - Loveland CO
Martin S. Wilson - Loveland CO
Daniel J. Griffin - Loveland CO
Robert E. Kuseski - Loveland CO
Louis T. Schulte - Loveland CO

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G06F 1502

US Classification:

364900

Abstract:

A programmable calculator employs modular read-write and read-only memories separately expandable to provide additional program and data storage functions within the calculator oriented toward the environment of the user and two sixteen bit LSI NMOS central processing units. One of the central processing units (LPU) is employed to perform language syntaxing, arithmetic, and general supervision of program execution. The second central processing unit (PPU) is employed for managing input/output operations. Communication between the two central processing units is accomplished by an arrangement through which the two central processing units share a common portion of memory. The calculator also includes a keyboard having a full complement of alphanumeric keys for entering programs and data into the calculator and for otherwise allowing the user to control operation of the calculator. The keyboard further includes a plurality of user-definable keys, some of which are pre-defined to have certain definitions at the time operating power is applied to the calculator.

US Patent:

41819667, Jan 1, 1980

Filed:

Apr 28, 1976

Appl. No.:

5/681291

Inventors:

Freddie W. Wenninger - Loveland CO
Donald E. Morris - Loveland CO
Jindrich Kohoutek - Loveland CO
David S. Maitland - Loveland CO
Douglas M. Clifford - Loveland CO
Louis T. Schulte - Loveland CO
John C. Keith - Loveland CO

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G06F 748

US Classification:

364715

Abstract:

An adaptable calculator is provided by employing five MOS/LSI circuits interconnected by a multiple line bus system. They include (1) a read-only memory circuit group; (2) a control and timing circuit; (3) an arithmetic and register circuit; (4) a data storage circuit; and (5) an input/output (I/O) circuit. Input and output units include a keyboard input unit and an 18-column output printer unit for printing intermediate results of calculations, entered data, arithmetic operators, and diagnostic notes. The keyboard input unit includes a PERCENT key that may be employed in combination with any of four arithmetic operator keys. The calculator may be operated manually by the user from the keyboard input unit or automatically by a program written in user-level language and stored in a plug-in read-only memory unit (ROM), a plug-in programmable read-only memory unit (PROM) or a read/write memory unit associated with a plug-in magnetic card reading and recording unit.