JPS58178460A - Electronic equipment with printer - Google Patents

Abstract

PURPOSE:To check arithmetic and operation, by printing out data as the operation of keys of a keyboard. CONSTITUTION:The keyboard 1 has a print indication key [PRT] in addition to keys necessary for function calculation, function keys, etc. A CPU2 is equipped with a register and prescribed arithmetic is carried out according to a signal from the keyboard 1 to send out adequately display information a display part 3 and print information to a printer 5 through a printer control circuit PCU. When the print indication key PRT on the keyboard 1 is pressed as the CPU2 indicates, not a current result, but a series of key operations so far is printed including errors. For example, when keys are operated in the order of 1, 2, X, divided by , 4, and + and the key PRT is pressed, not a result 3, but [12Xdivided by 4] is printed together with a symbol P. Consequently, the process of arithmetic and an error are checked.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to electronic devices such as calculators and scientific calculators that are equipped with a printing device, and particularly to electronic devices that are capable of printing out in accordance with key operations.

In a conventional electronic device with a printing device, such as a calculator with a printing device, when the key is pressed manually as shown in Figure 3 (A), ['11 (2) Figure If you input up to 1, r12
2÷" is printed. If you continue to input thth, the calculation result "8" in the middle of "112÷4" and the function symbol "10" are printed as "3 +".

In this way, the printed content of conventional calculators of this type is that the intermediate calculation results are printed, and when correcting the function key, the numerical value input again to the light and the corrected function symbol are printed, so the printed numerical value It is very difficult to determine whether the result is a result of an intermediate calculation or the manual input of the keys, and the process of calculation is very difficult to understand because the key operations and the printed contents do not match. Therefore, in the past, it was not possible to immediately check calculations or key operations by looking at the printed content.In view of this conventional drawback, the present invention prints out according to the key operations and easily performs calculations and key operations from the printed content. The purpose of the present invention is to provide an electronic device with a printing device that can check key operations.

An embodiment of the present invention will be described in detail below based on the drawings.

FIG. 1 is a block diagram of a calculator with a printing device according to the present invention. In the figure, 1 is a key unit consisting of a numeric keypad, keys necessary for function calculations, and other function keys, and 2 is a key unit consisting of X, Y, Z, and A necessary for performing various calculations.
, B, C, etc., and executes a predetermined operation in response to a key signal from the key unit 1.
a central processing unit that outputs display information and print information as appropriate;
3 is a display device for displaying the display information output from the processor 2; 4 is a display device that receives character codes for each line to be printed from the processor 2, and controls the operation of the printer 5 to print the code information; This is a printer control circuit that performs appropriate control.

In this embodiment, a print instruction key i is provided so that intermediate calculation results can be printed as necessary by operating any of the instruction keys.

FIG. 2 is a basic flowchart of the operation of this calculator with printing device.

When a certain key is pressed, the key is determined in step 1.2, and if the numeric key is pressed, l'' is stored in the A register (step 3), and this numeric data l is stored.
After storing it in the x register, display it in step 4) and return to the key reading state.

On the other hand, if the function key is pressed, the A
Check the contents of the register (Step 5) and confirm that the contents are l.
”, the content (numeric value) of the X register and the function symbol are supplied to the printer and printed.
(Step 6.7.8), set the contents of the A register to 00
'' and enters the display/key reading routine. If the result of the determination in step 5 is that the contents of the A register are .theta.'', the process advances to step 7 and only the function symbol is printed.

In other words, when a number is entered using the numeric keys and then a function key is pressed, the number and function symbol are printed, and if the function key is pressed continuously, the symbol of the pressed function key is printed. Print only.

When the print instruction key i is pressed (step 1), the numerical value and symbol P displayed at that time are transferred to the printer 5 and printed (step 1O1ll). That is, the intermediate calculation results can be printed along with the symbol P by operating the print instruction keystroke as necessary.

According to this configuration, when the above-mentioned series of key operations (挾一子 田田田) are performed, printing is performed as shown in FIG. Even if you operate continuously with the figure, only the corrected function symbol "÷" will be printed, and the previously input value will be printed again.

Although not particularly shown, by operating the print instruction key i', the intermediate calculation results can be printed out along with the symbol P.

As explained in detail above, since the electronic device with a printing device of the present invention can print out the printout according to key operations, calculations and key operations can be easily checked from the printed contents.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the device of the present invention, FIG. 2 is a basic flowchart of the operation of the device, and FIG. 8 is a diagram showing an example of conventional printing and an example of printing related to the device of the invention. 1 is a key unit, 2 is a central processing unit, 8 is a display device, 4 is a printer control circuit, 5 is a pudding center-0 Figure 3 Hakama-@Saigo Figure 2

Claims (1)

[Claims] 1. An electronic device with a printing device characterized in that it is configured to print out in accordance with key operations.