Sign display device

Claim 2

A sign display device comprising: a. a register having a plurality of bit positions for holding the information to be displayed; b. display means for visually displaying said information read out from said register; c. means for detecting a digit position separated by a predetermined number of digit positions from a given significant digit position corresponding to said first mentioned information which is to be displayed; d. an arithmetic operation control unit for controlling an arithmetic operation under control of function keys; e. arithmetic operation means for executing an operation; f. memory means for storing an output signal from said arithmetic operation control means and a signal generated by said arithmetic operation means; g. means for controlling said display means in such a manner that said display means may not receive the information stored in said register during the time interval required for detection of said detected digit position; and h. means for supplying to said display means a signal in accordance with any of said signals stored in said memory means to display a speCial sign at said detected digit position in said display means.

Claim 3

A sign display device according to claim 1, wherein said memory means comprises a flip-flop.

Claim 4

A sign display device according to claim 1, wherein said memory means is arranged to store a signal from a sign detection digit of an accumulator.

Claim 5

A sign display device according to claim 3, wherein there is provided a gate through which the signal generated by said arithmetic operation means and the signal from the sign detection digit of said accumulator are applied to said memory means, said gate being connected for control by an arithmetic command control signal from an arithmetic operation command control signal generator.

Claim 6

A sign display device according to claim 1, wherein said memory means is connected to a clear circuit operable in accordance with an operation of a clear key.

Claim 7

A sign display device according to claim 1, wherein the means for controlling said display means includes: a. a gate circuit to which is applied the signal indicative of the detected digit position and the output signal from said memory means; and b. means for applying an output of said gate circuit to segments of said display means, which display a special sign.

Claim 8

A sign display device according to claim 1, wherein said arithmetic operation control unit is connected to apply its output signal to said memory means through a gate circuit controlled by a signal from an entry control unit.

Claim 9

A sign display device comprising: a. a register having a plurality of bit positions for holding the information to be displayed; b. display device for visually displaying said information read out from said register; c. means for detecting a digit position separated by a predetermined number of digit positions from the most significant digit position corresponding to said first mentioned information held in said register; d. an arithemtic operation control unit for controlling an arithmetic operation under control of function keys; e. arithmetic operation means for executing an operation; f. memory means for storing an output signal from said arithmetic operation control means and a signal generated by said arithmetic operation means; g. means for controlling said display means in such a manner that said display means may not display the information held in said register during the time interval required for detection of said detected digit position; and h. means for supplying to said display means a signal in accordance with any of said signals stored in said memory means to display a special sign at said detected digit position in said display means.

Claim 10

A sign display device comprising: a. a register having a plurality of bit positions for holding the information to be displayed; b. display device for visually displaying said information read out from said register; c. means for detecting a digit position separated by a predetermined number of digit positions from the most significant digit position corresponding to said first mentioned information held in said register; d. an arithemtic operation control unit for controlling an arithmetic operation under control of function keys; e. arithmetic operation means for executing an operation; f. memory means for storing an output signal from said arithmetic operation control means and a signal generated by said arithmetic operation means; g. means for controlling said display means in such a manner that said display means may not display the information held in said register during the time interval required for detection of said detected digit position; and h. means for supplying to said display means a signal in accordance with any of said signals stored in said memory means to display a special sign at said detected digit position in said display means.

Claim 11

A sign display device comprising: a. a register having a plurality of bit positions for holding the information to be displayed; b. display means for visually displaying said information read out from said register; c. means for detecting the significant digits from said information held in said register; d. means for preventing the information of said register from applying to said display means at digit positions other than those corresponding to the significant digits; e. means for delaying by a predetermined time the output signal from said significant digit detecting means; f. a first gate circuit to which are applied an output signal from said detecting means and a delayed signal corresponding to said output signal from said detecting means; g. an arithmetic operation control unit for controlling an arithemtic operation under control of function keys; h. arithemtic operation means for executing an operation; i. memory means for storing an output signal from said arithmetic operation control unit and a signal generated by said arithmetic operation means; j. a second gate circuit to which are applied the output from said first gate circuit and the output from said memory means; and k. means for applying an output of said second gate circuit to segments of saId display means, which display a special sign.

Claim 12

A sign display device comprising: a. a register having a plurality of bit positions for holding the information to be displayed; b. display means for visually displaying said information read out from said register; c. means for detecting the significant digits from said information held in said register; d. means for preventing the information of said register from applying to said display means at digit positions other than those corresponding to the significant digits; e. means for delaying by a predetermined time the output signal from said significant digit detecting means; f. a first gate circuit to which are applied an output signal from said detecting means and a delayed signal corresponding to said output signal from said detecting means; g. an arithmetic operation control unit for controlling an arithemtic operation under control of function keys; h. arithemtic operation means for executing an operation; i. memory means for storing an output signal from said arithmetic operation control unit and a signal generated by said arithmetic operation means; j. a second gate circuit to which are applied the output from said first gate circuit and the output from said memory means; and k. means for applying an output of said second gate circuit to segments of saId display means, which display a special sign.

Claim 13

A sign display device comprising: a. a register having a plurality of bit positions for holding binary coded information to be displayed; b. display means for displaying said information read out from said register; c. a decoder for converting said binary coded information held in said register into signals to drive said display means; d. means for detecting the significant digits to be displayed from the information held in said register; e. means for preventing the output of said decoder from applying to said display means at digit positions other than positions corresponding to the significant digits detected; f. means for detecting a digit position spaced apart by a predetermined number of digits from a given one of the significant digits out of the information to be displayed; g. an arithmetic operation control unit for controlling an arithmetic operation under control of function keys; h. arithmetic operation means for executing an operation; i. memory means for storing an output signal from said arithmetic operation control unit and a signal generated by said arithmetic operation means; and j. means for supplying to said display means a signal in accordance with any of said signals stored in said memory means to display a special sign at a digit position spaced apart by a predetermined number of digit positions from the most significant digit of the significant digits in said display means.

Claim 14

A sign display device comprising: a. a register having a plurality of bit positions for holding binary coded information to be displayed; b. display means for displaying said information read out from said register; c. a decoder for converting said binary coded information held in said register into signals to drive said display means; d. means for detecting the significant digits to be displayed from the information held in said register; e. means for preventing the output of said decoder from applying to said display means at digit positions other than positions corresponding to the significant digits detected; f. means for detecting a digit position spaced apart by a predetermined number of digits from a given one of the significant digits out of the information to be displayed; g. an arithmetic operation control unit for controlling an arithmetic operation under control of function keys; h. arithmetic operation means for executing an operation; i. memory means for storing an output signal from said arithmetic operation control unit and a signal generated by said arithmetic operation means; and j. means for supplying to said display means a signal in accordance with any of said signals stored in said memory means to display a special sign at a digit position spaced apart by a predetermined number of digit positions from the most significant digit of the significant digits in said display means.

Claim 15

A sign display device comprising: a. a register having a plurality of bit positions for holding binary coded information to be displayed; b. display means for visually displaying said information read out from said register; c. a decoder for converting the binary coded information held in said register into signals for driving said display means; d. means for detecting the significant digits to be displayed from the information held in the register; e. means for preventing output signals of said decoder from being applied to said display means at digit positions other than positions corresponding to the significant digits detected; f. a delaying circuit for delaying the output signal from said detecting means for a time corresponding to the shifting of one digit; g. a first gate circuit to which are applied the output signal from said detecting means and a delayed signal of the output signal from said detecting means; h. a flip-flop; i. means for applying an output signal of an arithmetic operation control unit to said flip-flop through a second gate circuit controllable by a signal from an entry control unit; j. means for applying a signal generated by an arithemtic operation means and a signal derived from a sign detection digit of an accumulator to said flip-flop through third gates controllable by an arithmetic command control signal generated in an arithmetic operation command control signal generator; k. a clear circuit for clearing said flip-flop; l. a fourth gate circuit to which are applied the output from said first gate circuit and the output from said flip-flop; and m. means for applying the output of said fourth gate circuit to segments of said display means, which display a special sign.

Claim 16

A sign display device comprising: a. a register having a plurality of bit positions for holding binary coded information to be displayed; b. display means for visually displaying said information read out from said register; c. a decoder for converting the binary coded information held in said register into signals for driving said display means; d. means for detecting the significant digits to be displayed from the information held in the register; e. means for preventing output signals of said decoder from being applied to said display means at digit positions other than positions corresponding to the significant digits detected; f. a delaying circuit for delaying the output signal from said detecting means for a time corresponding to the shifting of one digit; g. a first gate circuit to which are applied the output signal from said detecting means and a delayed signal of the output signal from said detecting means; h. a flip-flop; i. means for applying an output signal of an arithmetic operation control unit to said flip-flop through a second gate circuit controllable by a signal from an entry control unit; j. means for applying a signal generated by an arithemtic operation means and a signal derived from a sign detection digit of an accumulator to said flip-flop through third gates controllable by an arithmetic command control signal generated in an arithmetic operation command control signal generator; k. a clear circuit for clearing said flip-flop; l. a fourth gate circuit to which are applied the output from said first gate circuit and the output from said flip-flop; and m. means for applying the output of said fourth gate circuit to segments of said display means, which display a special sign.