Texas Instruments Corporation

Gary W Boone

Michael J Cochran

Edward R Caudel

Jerry L Vandierendonck

A variable function calculator utilizes a fixed program memory array such as a programmed read only memory in which a number of programs are stored depending upon the desired functions of the calculator. The calculator also includes a program counter, an instruction register, control decoders, jump-condition circuits, a clock generator, a timing generator, digit and FLAG mask decoders, key input logic, a register and FLAG data storage array, a decimal and FLAG arithmetic logic unit, an output decoder, and a digit scanner which scans both the keyboard and display outputs. Aside from providing basic desk top calculator functions, the read only memory may be programmed so that the system provides metering functions, arithmetic teaching functions, control functions, etc.. A preferred embodiment of the invention is capable of being fabricated as a monolithic integrated semiconductor system utilizing contemporary metal-insulator-semiconductor techniques.

Variable function programmed calculator

Variable function programmed system

A variable function calculator utilizes a fixed program memory array such as a programmed read only memory in which a number of programs are stored depending upon the desired functions of the calculator. The calculator also includes a program counter, an instruction register, control decoders, jump-condition circuits, a clock generator, a timing generator, decoders, key input logic, a data storage array, an arithmetic logic unit, an output decoder, and a digit scanner which scans both the keyboard and display outputs. Aside from providing basic desk top calculator functions, the read only memory may be programmed so that the system provides metering functions, arithmetic teaching functions, control functions, etc. A preferred embodiment of the invention is capable of being fabricated as a monolithic integrated semiconductor system utilizing contemporary metal-insulator-semiconductor techniques.

Single-chip semiconductor unit and key input for variable function

A variable function calculator utilizes a fixed program memory array such as a programmed read only memory in which a number of programs are stored depending upon the desired functions of the calculator. The calculator also includes a program counter, an instruction register, control decoders, jump-condition circuits, a clock generator, a timing generator, decoders, key input logic, a data storage array, an arithmetic logic unit, an output decoder, and a digit scanner which scans both the keyboard and display outputs. Aside from providing basic desk top calculator functions, the read only memory may be programmed so that the system provides metering functions, arithmetic teaching functions, control functions, etc.. A preferred embodiment of the invention is capable of being fabricated as a monolithic integrated semiconductor system utilizing contemporary metal-insulator-semiconductor techniques.

A variable function system utilizes a fixed program memory array such as a programmed read only memory in which a number of programs are stored depending upon the desired functions of the system. The system also includes a program counter, an instruction register, control decoders, jump-condition circuits, a clock generator, a timing generator, key input logic, data storage array, an arithmetic logic unit, an output decoder, and a digit scanner which scans both the keyboard and display outputs. The read only memory may be programmed so that the system provides a variety of functions. A preferred embodiment of the invention is capable of being fabricated as a monolithic integrated semiconductor system utilizing contemporary metal-insulator semiconductor techniques.

A variable function calculator utilizes a fixed program memory array such as a programmed read only memory in which a number of programs are stored depending upon the desired functions of the calculator. The calculator also includes a program counter, an instruction register, control decoders, data storage array, a decimal arithmetic logic unit, an output decoder, and a digit scanner which scans both the keyboard and display outputs. Aside from providing basic desk top calculator functions, the read only memory may be programmed so that the system provides metering functions, arithmetic teaching functions, control functions, etc., and to accommodate these different uses the output decoder is mask-programmable. A preferred embodiment of the invention is capable of being fabricated as a monolithic integrated semiconductor system utilizing contemporary metal-insulator-semiconductor techniques.

Display method for variable function programmed system

A variable function calculator utilizes a fixed program memory array such as a programmed read only memory in which a number of programs are stored depending upon the desired functions of the calculator. The calculator also includes a program counter, an instruction register, control decoders, jump-condition circuits, a clock generator, a timing generator, digit and FLAG mask decoders, key input logic, a register and FLAG data storage array, a decimal and FLAG arithmetic logic unit, an output decoder, and a digit scanner which scans both the keyboard and display outputs. Aside from providing basic desk top calculator functions, the read only memory may be programmed so that the system provides metering functions, arithmetic teaching functions, control functions, etc. A preferred embodiment of the invention is capable of being fabricated as a monolithic integrated semiconductor system utilizing contemporary metal-insulator-semiconductor techniques.

A variable function calculator utilizes a fixed program memory array such as a programmed read only memory in which a number of programs are stored depending upon the desired functions of the calculator. The calculator also incudes a program counter, an instruction register, control decoders, jump-condition circuits, a clock generator, a timing generator, digit and FLAG mask decoders, key input logic, a register and FLAG data storage array, a decimal and FLAG arithmetic logic unit, an output decoder, and a digit scanner which scans both the keyboard and display outputs. Aside from providing basic desk top calculator functions, the read only memory may be programmed so that the system provides metering functions, arithmetic teaching functions, control functions, etc. A preferred embodiment of the invention is capable of being fabricated as a monolithic integrated semiconductor system utilizing contemporary metal insulator-semiconductor techniques.

Display and keyboard scanning for electronic calculation or the like

A computing system includes a central processor unit (CPU) in combination with external memory units. The CPU includes, on a single chip, an arithmetic logic unit (ALU), an instruction register, a random access memory and a control system. Interconnection of the functional elements of the CPU is accomplished via sequential use of a common parallel buss. The ALU contains precharged parity and carry propagate circuits which enhance circuit speed. The precharged circuits are formed using conventional insulated-gate-field-effect transistor fabrication techniques.

Precharge arithmetic logic unit

A computing system includes a central processor unit (CPU) integrated on a monolithic chip, in combination with a plurality of external memory units. The CPU includes a parallel arithmetic logic unit (ALU) and an internal random access memory interconnected on a common parallel bus with an instruction register. The random access memory defines the general purpose data registers, program and memory address registers, and a multilevel program address stack. Timing circuitry in the CPU enables utilization of either serial or random access external memory units. The timing control of the CPU enables a method of operation characterized by sequential transmission of low order address bits, WRITE data, high order address bits and READ data over a common external parallel bus that interconnects the CPU with the external memory.

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Houston, TX, United States of America

Gary W Boone