JPS5831222Y2 - electronic desk calculator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electronic device, particularly an electronic desktop calculator (hereinafter referred to as a calculator), which is equipped with a printing device and a display device.

″ □゛：′・“1 Conventional as above □
The train displays the same content as the printed content on the display device.

The name of the device is the on/off switch;
Even though the switch was turned off, the printing device did not change the operation of the display device.

Normally, when the printing device is operating, it is easier to use if the display is the same as the printed content, but in this case, if you want to see the intermediate results of a calculation, you need to press a subtotal key or the like.

However, when the printing device is not in operation, it is easier to use it by displaying intermediate results like a normal calculator.

The present invention has been devised in view of the above-mentioned points, and it is an object of the present invention to provide a calculator in which intermediate results are displayed on a display device when the printing device is turned off.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of a calculator implementing the present invention,
K is the keyboard, D is the display device, P is the printing device, CPU
is an arithmetic control section.

X is a numeric register that stores numerical values in the display order of the numeric keys on the keyboard.

Y is the most commonly used register, and the calculation instruction key on the keyboard (
For example, the answer (calculation result) after performing the calculation according to the addition key (1) is stored.

The switch SW1 instructs the printing device P to be turned on or off, and can be switched manually, for example.

In conventional calculators, only the tl line for controlling the printing device P on and off is provided, but in the present invention, gates G1, G2, . Means are provided for controlling G4.

That is, when the switch SW1 is on, the contents of the X register are G1. It is constantly supplied to the display device via G3,
When a printing command is generated after the calculation instruction key is suppressed, the contents of the X register □: are supplied to the printing device P via gate G4.

On the other hand, when the switch 'SW1 is off, Gl, G
4 is turned off and gate G2 is turned on, so that the contents of calculation register Y are constantly supplied to the display device.

Next, the operation will be explained with reference to FIG.

□ First, main ≠ 4 with SW1 on, 11+ in Figure 2 B
Key operations up to 7 steps will become obsolete.

When you operate the numerical keys in the order of 1 → 2 → 3, r'i 2'3. J-h: Stored and displayed on J display device.

Next, when the prana and -1 are operated, the contents of the X register and the Y register are added, and the result of the addition is obtained in the Y register, while the contents of the X register are held.

Then, according to the print command, the contents of the X register and the symbol 10 of the addition key are printed as shown in FIG. 2A.

Hereinafter, when "456" is introduced, this content will be displayed on the display device, and when the + key is further pressed, the contents of the X and Y registers will be as shown in 4 in Figure 2B, and "456. +
” is carried out.

The following operations are also similar. When you want to see the addition result, press the subtotal key, transfer the contents of the Y register to the X register, and display and print it (7 in Figure 2B).

When switch SW1 is off, G2 is turned on, so the contents of the Y register are always displayed.

This corresponds to the contents of each step of the Y register in FIG. 2B.

Therefore, when the switch SW1 is off, the display device will display the intermediate results.

In the above embodiment, X,
Although the display of the Y register is switched, a separate switch may be provided to switch the display of the X and Y registers even while the printing device is in operation.

Since the electronic desktop calculator of the present invention is constructed as described above, intermediate results can be displayed on the display device when the printing device is turned off.

Moreover, its configuration is extremely simple.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram for explaining the operation of FIG. 1. Code, D... Display device, P... Printing device, X, Y.
...Register, K...Keyboard, SWl...Switch, GI G4...Gate.

Claims (1)

[Scope of Claim for Utility Model Registration] It has a number register connected to a display device and a calculation register, and performs a corresponding calculation every time a calculation instruction key is suppressed, and obtains the calculation result in the calculation register. In addition, the contents of the number register are printed by an i-character device, and a switch is provided to control turning on and off of the printing device,
An electronic desktop calculator comprising gate means for cutting off the supply of the contents of the number register to the display device and supplying the contents of the calculation register to the display device by turning off the switch. , □