JPH0122657B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a calculator having a function of rereading or re-executing input numerical information or arithmetic instructions.

The above function is generally referred to as a verification function, and stores or registers numerical information, arithmetic instructions, or their results at the time of input into a verification memory prepared in advance, and starts verification by pressing a specific key.

Conventionally, when a calculator with a verification function is used, all input key information is registered in the verification memory, resulting in unnecessary numerical information, calculation instructions, etc. being registered. For example, when adding a large amount of numerical information, if a temporary multiplication operation is used, the temporary multiplication operation is also registered, which is unreasonable. Accordingly, the present invention provides a calculator capable of storing information inputted by an input means as necessary.

An embodiment of the calculator according to the present invention will be described below with reference to the drawings.

FIG. 1 is an external view of a calculator according to the present invention.
In the figure, MEM-IN is a switch that selects whether or not to register in the verification memory. For example, when performing an interrupt operation that does not require verification while adding a large amount of numerical information to be verified, the switch
MEM-IN may be set to the OFF position, and when registering numerical information or arithmetic commands and their results by key input, it may be set to the VER position. Alternatively, if you want to register only the calculation result immediately after pressing the = key, you can set it in the ANS position.

To further explain the figure, PRT is a printer, SP is a speaker for audio output, DiSP is a display tube for visually displaying numerical information, and KB is an operation panel, with the following keys and keys.
It is equipped with a switch. NoL is a switch for adjusting the volume, SPEED is a switch for specifying the word pronunciation interval, SOUND is a switch for specifying whether to output audio, KK is a group of key switches necessary for the verification function, and CLR/key is a memory for verification. clear, PEP key to re-execute using information in the verification memory, BK key to reverse verification, ST/
The SP key is used to start and stop the calculation.

TK is the key switch group required when setting numbers,
FK is a group of keyswitches for instructing arithmetic instructions.

FIG. 2 shows a block diagram of the calculator described in FIG. In the same figure, SW is the switch in Figure 1.
It corresponds to MEM-IN and is a slide switch. R1 and R2 are pull-up resistors, G1 is a negative logic OR gate, G2 and G3 are
is a negative logic AND gate. AI is an address incrementer, and the calculation control section will be described later.
Address incrementer from CONT through bus PORTBUS, signal line L8 and gate G3
By applying a strobe pulse to the C terminal (clock terminal) of AI, the address increases by 1,
Confirmed address information is being sent to the address bus (AB). Initializing (resetting) the address incrementer AI can be done by setting the R terminal of the address incrementer AI to the ground level.
RAM is a memory for verification, and when writing, the address incrementer AI sets it through the fixed address bus AB, and the data to be written is set from the arithmetic control unit CONT through the bus PORTBUS and data bus (DB). Data is written by applying a negative logic strobe pulse to the RAM terminal. When reading, set address information,
By applying a ground level signal to the RD terminal, the data read from inside the memory RAM is sent through the data bus DB toward the arithmetic control unit CONT.
The contents of RAM can be read. FF is a D-type flip-flop, terminal D is for data input, C is a clock terminal for latching data, is an output terminal, and R is a reset terminal.
CONT is equipped with a calculation function, and includes a processing unit CPU, storage device MEM, and key buffer memory KBM.
It is an arithmetic processing unit equipped with. Arithmetic processing unit CONT
is the input section KEY through the key buffer KBM.
SSW (corresponds to the operation panel KB shown in Figure 1)
It is connected to the. I/O dedicated port bus
PORTBUS is the input/output port of the arithmetic control unit CONT
Connected to PORT.

The operation of the embodiment configured as described above will be explained.

The slide switch SW shown in FIG. 2 (switch MEM-IN shown in FIG. 1) has three fixed positions.

The operations at each of the three positions will be explained below. When the slide switch SW is at the position ANS, the switch information sending line (L5) becomes the ground level and notifies the arithmetic and control unit CONT that the slide switch SW is at the position ANS. Then, as shown in Figure 3, the calculation control unit CONT
After the key is pressed, the calculation result is stored in memory.
Before writing to RAM, flip-flop FF is set to ground using lines L3 and L4. At this time, the terminal 1 of the OR gate G2 becomes the ground level through the AND gate G1, so the OR gate G2 is opened and the write signal is applied to the memory RAM through the line L1. Furthermore, at this time, the OR gate G3 is similarly opened, and the address increment pulse for updating the address of CONT is input to the C terminal of the address incrementer AI through the line L8, so that the address is also updated. Further, when the slide switch SW is at the position VER, the line L5 is at the + level, and since the arithmetic control unit CONT has reset the flip-flop FF, the terminal 2 of the AND gate GI is at the + level. However,
Terminal 1 of AND gate G1 is a slide switch
Since it is at ground level via SW, OR gates G2 and G3 open. Therefore, the write signal is
For WT, an address increment pulse can be applied to terminal C. At this time, unlike the previous example (in the case of the ANS position), the arithmetic control unit CONT does not need to set the flip-flop FF. Therefore, all key input information (numeric information or arithmetic instructions) etc. are written into the memory RAM, and addresses are also updated. When the slide switch SW is in the OFF position, the terminal 1 of the AND gate GI is +
level, CONT detects the + level of line L5,
In order to reset the flip-flop FF, terminal 2 of G1 also goes to + level, OR gates G2 and G3 are closed, and writing to the memory RAM and address updating are not performed. Furthermore, memory RAM
When reading from a flip-flop
By constantly setting FF, slide switch Agate G3 is opened, regardless of SW.
Update the address of address incrementer AI,
Can be read arbitrarily.

According to the present invention, a keyboard input means for inputting numerical information, arithmetic instructions, arithmetic execution instructions, first mode, second mode, third mode, and verification instructions; and input from the keyboard input means are provided. storage means having a plurality of storage locations for calculating the numerical information or the calculation instructions; and address means for storing address information for specifying the storage location of the storage means; in the first mode, Executing numerical information input from the keyboard input means and calculation information regarding the numerical information by a calculation execution instruction,
The address information of the address means is held and no information is stored in the storage means, and in the second mode, the calculation information regarding the numerical information and external numerical information input from the keyboard input means is used as an operation execution command. update the address information of the address means and store the calculation result information in the storage means, and in the third mode, the numerical information input from the keyboard input means and the calculation information regarding the numerical information are updated. executed by a calculation execution instruction, updates the address information of the address means, stores the numerical information, calculation information, and calculation result information in the storage means based on the address, and stores the numerical information, calculation information, and calculation result information in the storage means based on the address information of the address means. By having processing means for reading stored information for verification from each of the plurality of storage locations, input information can be stored as necessary, so unnecessary information does not need to be input. Moreover, the width of the necessary information can be selected.

[Brief explanation of drawings]

Figure 1 is an external view of the calculator according to the present invention, Figure 2 is a block diagram, and Figure 3 shows the slide switch SW.
Signal waveform diagram when in ANS MEN-IN...Switch, G1...AND gate, G2, G3...OR gate.

Claims (1)

[Scope of Claims] 1. Keyboard input means for inputting numerical information, arithmetic instructions, arithmetic execution instructions, first mode, second mode, third mode, and verification instructions;
a storage means having a plurality of storage locations for verifying the numerical information or the arithmetic instruction inputted from the keyboard input means; an address means for storing address information for designating the storage location of the storage means; In a first mode, numerical information inputted from the keyboard input means and calculation information regarding the numerical information are executed by a calculation execution command;
The address information of the address means is held and no information is stored in the storage means, and in the second mode, the calculation information regarding the numerical information and external numerical information input from the keyboard input means is used as an operation execution command. update the address information of the address means and store the calculation result information in the storage means, and in the third mode, the numerical information input from the keyboard input means and the calculation information regarding the numerical information are updated. executed by a calculation execution instruction, updates the address information of the address means, stores the numerical information, calculation information, and calculation result information in the storage means based on the address, and stores the numerical information, calculation information, and calculation result information in the storage means based on the address information of the address means. processing means for reading stored information from each of the plurality of storage locations for verification.