JPS58181164A - Electronic computer - Google Patents

Abstract

PURPOSE:To make an electronic computer small-sized, by using operation instruction key in the calculation mode as instruction key in the graph mode. CONSTITUTION:A mode switch MD has two positions of a calculation mode CAL and a graph mode GRPH. In the normal calculation mode, keys (+) and (-) function as adding and subtracting instruction keys respectively. When the switch MD is set to the mode GRPH, these keys (+) and (-) are used for inputting graph consisting element data. A graph is printed in accordance with already inputted graph constituting element data by a key (*=) which is used as the addition/subtraction end and result printing instruction key in the calculation mode. Consequently, keys only for graph printing are unnecessary on a keyboard.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic computer having a function of outputting input numerical data or calculation result data in the form of a graph to a display or printed paper.

For users who perform office calculations using computers with printing devices, etc., there are many opportunities to convert data into graphs and use them as materials for various purposes, so these computers with printing devices have graph printing functions. -2 is very convenient for those users. However, adding a graph output function such as a graph printing function requires a dedicated key and increases the size of the computer.

The present invention is based on the above background, and aims at miniaturization by making the calculation command keys in the calculation mode also serve as command keys in the graph mode.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a computer showing an embodiment of the electronic computer according to the present invention. Here, KB is a keyboard, and this keyboard KB includes a group of numerical keys (NK) from (6) to the figure.
A group of function keys FK (5), and a mode switch MD for selecting calculation mode or graph mode are provided. Mode switch MD takes two positions: calculation mode (CAL) and graph mode (GRPH). a p ty is a control unit (1 control unit) The CPU receives a signal KBS from the keyboard KB and signals from other circuits and sends various control signals CPFtT, CD5P, and CRi to each circuit described later.

It supplies OR2, ORB, OR4, 0PNT, 0kLU, etc., and can be constituted by a read-only memory device ROM that stores a group of microinstructions for supplying control signals for generating and rotating flex pulses.

R1-R4, PNT are, for example, 4-bit parallel registers, and the signals OR supplied from the control unit CPU are
Transfer and store data under the control of I, CR2, OR5, CR4,0PNT.

Here, R1 stores numerical input data from the keyboard KB, R2-R4 stores data to be graphed, and R2 also stores data of addition and subtraction results in calculation mode. PNT is a pointer that stores the storage location of graph data. Arithmetic ALU is pass 2 in B
Performs arithmetic processing such as addition and subtraction on the data supplied through the . The display device DISP is a display device for visualizing data sent via path 2 in B,
For example, a 7 segment fluorescent display tube is used. Printing device PE
T is a printing device that prints data and graph patterns supplied via the pass line B on printing paper, and in this example, a dot matrix type printing device is used.

Here, the control unit CPU detects the signal from the keyboard KB and the status of other circuits, and
(0 signal GPRT which generates the following signal from 3PU supplies the data of pass line B to the printing device PRT, and controls the printing device PRT. The data of pass line B is supplied to the display device DIS by the signal CD5P.
P and controls the display device DtSP. Signal C
R1 supplies the data of register 1F (1 to pass line B, and the data of pass line B to register B1.

The data in the register R2 is supplied to the pass line B, and the data in the pass line B is supplied to the register F12 by the signal C5F12. The data in the register B3 is supplied to the pass line B, and the data in the pass line B is supplied to the register R5 by the signal CB3. The data of the register R4 is supplied to the pass line B, and the data of the pass line B is supplied to the register R4 by the signal OR4. The signal 0PNT sends the data of the register PNT to the path 2 in B, and the data of the pass line B to the register PNT.The 0 signal CALUK sends the data of the arithmetic unit ALU to the pass line B, and the data of the pass line B to the path 2 in B. ) is supplied to the ALU.

Next, the operation of the electronic computer shown in FIG. 1 will be explained in the case of key switch operation shown in FIG. 6, with reference to the flowchart of the processing in FIG. 2. For example, when the mode switch MD is set to GRPH in step 1,
The mode switch signal SWS is sent to the control unit CPU, and this control unit CPU receives control signals 0PNT, C
D5P is supplied to the register PNT and the display device DISP, and as shown in the display example of step 1, the contents of the pointer to the graph component data storage register are displayed in the digit to the right of 'D-'. Next, when the numeric key field is pressed in step 2, the type of key is determined in step S1 of FIG. The control unit CPU sends the register RIK control signal ORi, and data 11'' is stored in the register R1. and control signals ORi, CD5
Under the control of P, data 11'' in register R1 is transferred to display device D18P and '1'' is displayed.Next step 6
In the numeric key E1. When [] is pressed, step 2
The same operation as above is performed, and data ``150'' is stored in register R1.
．． ' is stored, and '150.' is stored on the display device DISP. ''' is displayed.Next, when the field key PK is pressed in step 4, the mode of the mode switch MD is determined in step S6, and in this case, since it is the graph mode, step S4
In this case, the key is pressed, so the pm signal KBS is sent to the control unit CPU, and as shown in step S5, this control unit CPU sends the control signal 0PN.
Sends Ft1. FI
2, the control signals OR1 and OR2 are sent, and the data "i50." in the register Fil is transferred to the register R2. and control signal CPNT.

Register PNT is incremented by 1 under the control of 0ALU.

Note that the same process may be performed using the date key in place of the ta key PK. Numerical data ``I Do,''.

"180." are stored in registers R11 and F (4).Next, when the ■ key EK is pressed in step 7, the key signal KBS is sent to the control unit (3PU), and from step 6 to step 7 , and here the control signal 01
R2, CR5, (31R4, CPNT.

Under the control of CPR7, it is possible to associate three graph patterns of two lines with each data stored in R2, R5, and R4 to obtain a graph print as shown in the print example in step 7. can. After this, in step 8, the register PNT is reset.

Also, if the mode switch MD is set to CAL,
The bolt key EK commands so-called equal, and specifically, when the process advances from step S9 to step S10, the contents of register R2 are printed here.

Further, step 811 is a processing step when a function key other than the l key EK is pressed while the mode switch MD is in the CAL position.
Addition and subtraction are performed.

In this way, in the normal calculation mode, graph component data is input using the field key, which functions as an addition instruction key.
The (5) key, which serves as the addition/subtraction end/result print command key, allows graph printing in accordance with the graph component data input using the key. Therefore, there is an advantage that there is no need to place a special key on the keyboard for printing graphs, and the function of the key 1] key in normal calculation mode is similar to the function of key roto in graph printing mode. This provides the advantage of improved usability.

In the above embodiments, the printing device PRT is shown as the graph output means, but the display device DISP may also be used, or the graph may simply be displayed and output there.

As described above, according to the present invention, the instruction in the calculation mode is also used as the instruction in the graph mode, thereby making it possible to reduce the size and cost.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a computer according to the present invention, FIG. 2 is a flowchart showing control of key processing operations, and FIG. 6 is an explanatory diagram of each key operation procedure in FIG. 1. It is. Here, KB...00 keyboard, NK...-numeric key p, FK...-function key group, MD...
・@0 mode switch. Applicant Canon Co., Ltd.

Claims (1)

[Claims] (1) In an electronic computer having at least a calculation mode and a graph mode, there is also an electronic calculation characterized in that an operation instruction key in the calculation mode is also used as an instruction key in the graph mode (2) The operation instruction key is an addition instruction key and an operation instruction key in the graph mode. 2. The electronic computer according to claim 1, further comprising an end command key, and in a graph mode, the addition command key is used as an input key for graph data, and the calculation end command key is used as a graph output key.