JPS609997Y2 - Connection structure between data processing device and memory cassette - Google Patents

Description

[Detailed description of the invention] This invention enables data exchange and power supply by connecting multiple contacts of a data processing device and connection terminals provided on a memory cassette corresponding to these multiple contacts. The present invention relates to a connection structure between a data processing device and a memory cassette.

A small electronic computer, generally called a personal computer, performs various calculations by processing programs and data stored in the computer's internal memory.In order to expand the memory capacity, floppy disks or cassettes are used as external memory. Equipped with magnetic tape, etc.

However, in order to run a program stored in this kind of external memory, it is necessary to load the program into the memory inside the small computer after inserting a floppy disk, for example, and then execute the program that has been created. When saving a file, it is necessary to transfer it to a floppy disk, which has the disadvantage of being time-consuming and labor-intensive.

Therefore, attempts have been made to expand the memory capacity by making the internal memory itself a cassette and making it replaceable.

According to this, a program can be executed without a load operation by installing a memory cassette, and can be stored as is by removing the memory cassette without a store operation.

That is, this memory cassette is a package of user RAM of a predetermined capacity, and is detachably installed in a small computer.

This memory cassette has a built-in battery, and a backup voltage is constantly applied to the memory cassette so that the contents stored in the RAM are not destroyed.

By the way, when a memory cassette is attached to a small computer and is being used, power is supplied from the power supply provided in the small computer via the power line, reducing battery consumption when using the memory cassette. It has become.

However, when installing a memory cassette into a small computer, if the power supply is switched from the battery to the computer's power supply before the connection terminals on the memory cassette are fully connected, noise will occur in the signal line. , there is a risk that the memory contents stored in the RAM may be destroyed due to this noise.

Therefore, the power source must be connected to the RAM via the power line after the connection terminals are completely connected.

Furthermore, if the connection of other signal terminals becomes defective when the power supply line is completely connected, incorrect data may be exchanged.

This idea was made based on the above-mentioned circumstances, and its purpose is to connect the connection terminals provided on the memory cassette to a data processing device such as a small computer, and then connect the power supply to the data processing device. An object of the present invention is to provide a connection structure between a data processing device and a memory cassette, which can supply power to the memory via a power supply line and prevent noise and erroneous data from being exchanged.

An embodiment of this invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows an external view of the memory cassette. A flat board 2 is protruded from one end of the memory cassette 1 as a connection part on the memory cassette side, and a plurality of connection terminals are provided on this board 2. Group 3 is arranged in parallel.

The connection terminals located outside the circle of this connection terminal group 3 are power supply connection terminals 4.

Power supply connection terminals 5, which are formed to have a considerably shorter length, for example, 1/3 of the length of the connection terminals 3 and power supply connection terminals 4, are provided at three equal intervals in the connection terminal group 3. .

The board 2 is connected to a connecting terminal provided in a female joint (not shown) of a small computer, and the connecting terminal 3 and the power supply connecting terminal 4 are connected securely or stably. When this happens, the power supply connection terminal 5 is connected.

FIG. 2 shows a state in which the board 2 of the memory cassette 1 is inserted into the female joint of the small computer 6, and these are electrically connected.

In Fig. 2, the circles marked on these connection lines indicate the contact points when the terminals are connected to each other, and the contacts 7 and 8 at the top and bottom in Fig. 2 are power supply connections. terminal 4
The contacts 9, 10, 11 correspond to the power supply connection terminal 5, and the contacts 12, 13, . . . n-1, n correspond to the connection terminal 3.

Thus, on the side of the small electronic computer 6, the central processing unit (CPU) 14 is driven by the power supply voltage applied from the power supply 15 via the power supply path line a.

Further, the CPU 14 provides read/write signals, data addresses, etc. to the peripheral device 16 including input/output devices through the path line B2, and exchanges data with the peripheral device 16.

Further, the "High" level potential from the power source 15 is applied to the contact 7 via the power line 11, and the ground potential is applied to the contact n via the power line 1.

Further, the contacts 8 and 9 are connected via the power line 13 to the contacts 10 .
11 is the power line 1. are connected to each other via.

Read/write signals, address designation signals, data signals, etc. from the CPU 14 are transmitted through the corresponding contacts 12, 1.
3...Given to n-1.

On the other hand, on the memory cassette side, the potential applied to the contact 7 is applied to the contact 8 via the power supply line m1.

Further, the potential applied to the contact 9 is applied to the contact 10 via the power supply line m2, and the potential applied to the contact 11 is applied to the RAM 15 via the diode 15 in the forward direction and to the secondary voltage via the step-down resistor R. It is applied to the positive electrode side of the battery 17.

In other words, is the potential from the power source 15 at each contact? , 8.9.
10. It is applied to the RAM 16 via the power supply connection terminals 4 and 5 corresponding to 11 in series.

The secondary battery 17 is for protecting the memory contents of the RAM 16 from being destroyed, and the battery voltage is R.
It is applied as a backup voltage to AM16.

That is, the negative electrode side of this secondary battery 17 is connected to one terminal of the RAM 15, and the positive electrode side is connected to the other terminal of the RAM 16 via a forward diode 18 connected in parallel to the step-down resistor R. .

Further, an address designation signal, a read/write signal input from the contacts 12, 13, . . . , n-1,
Alternatively, the data signal is applied to RAM 16.

Note that the RAM 16 stores data for use by the user, and the data read from the RAM 16 is sent to the three-state buffer 19, the contacts 12 . 13.・・・
...Given to crtr14 via n-1.

The three-state buffer 19 is given a potential from the contact 11, and when this potential reaches a predetermined level, it passes the input signal, but otherwise it passes the input signal through the contacts 12, 13, . . .
. . . serves to isolate between n-1 and the RAM 16.

Next, the operation of the memory cassette connecting device described above will be explained.

Now, with the power provided in the small computer 6 turned on, the board 2 of the memory cassette 1 is inserted into the female joint of the small computer 6.

Then, each connection terminal 3 and the power supply connection terminal 4 are connected by about 2n, so the potential from the power supply 15 is connected to the power supply line 1□,
It is applied to the contact 9 via the contact 7, the power line m□, the contact 8, and the power line 13.

At this time, since the power supply connection terminal 5 is not connected to the female joint, backup voltage continues to be supplied to the RAM 16 from the secondary battery 17.

Then, after each connection terminal 3 and power supply connection terminal 4 are joined in a reliable or stable state, power supply connection terminal 5 is joined to the female joint portion.

Then, the potential applied to the contact 9 is applied as a backup voltage to the RAM 15 via the power line m2, the contact 10, the power line 12, the contact 11 and the forward diode 18, and is applied from the secondary battery 17 to the RAM 16. The supply of backup voltage that was being used will stop.

At the same time, W from the contact 11 is given to the three-state buffer 19, and each contact 12t 13t ---
---N-1 and RAM15 are electrically connected, and CPU1
Signals are exchanged between RAM 16 and RAM 16.

On the other hand, when the board 2 is removed from the female joint with the power supply 15 turned on, the supply of backup voltage from the power supply 15 to the RAM 15 is stopped, and
Backup voltage will be supplied from the secondary battery 17.

At the same time, the potential applied to the three-state buffer 19 becomes high impedance, and each contact 12°1
3, . . . n-1 and the RAM 16 are cut off.

As described in detail above, according to this embodiment, the power supply connection section for connecting the CPU 14 and the RAM 15 in the memory cassette 1 is provided not at one location but at multiple locations, and the power supply line runs through all of them in series. Therefore, if even one of the connections is bad, power will not be supplied to the RAM 16, and data will not be exchanged unless everything is securely connected, which prevents noise and incorrect data from being exchanged. can.

In the above embodiment, some of the power supply connection terminals are set shorter than others, but they may all have the same length.

Further, in the above embodiment, the number of power supply connection terminals is five, but this number is not limited, and three or more, that is, 3+2rI (n=0, 1, 2...) may be provided. Good.

Furthermore, in the above embodiment, the case where this invention is applied to a small electronic computer has been explained, but this invention is not limited to the above embodiment, and can be applied to other data processing devices, such as electronic registers. I can do it.

As explained in detail above, this invention provides a data processing device with at least three power contacts spaced apart from each other in order to supply power from the power supply section of the data processing device to the internal circuitry of the memory cassette. In addition, the same number of power supply connection terminals are provided on the memory cassette corresponding to the three or more power supply contacts, and a first contact terminal corresponding to a first contact to which power is supplied from the power supply part among the power supply contacts is provided on the memory cassette. A connecting terminal is directly wired to a second connecting terminal in the memory cassette, a second contact corresponding to this second connecting terminal is directly wired to a third contact in the data processing device, and Since the wiring is done so that power is supplied to the inside of the memory cassette from the third connection terminal corresponding to the contact, unless all of the power supply connections corresponding to three or more power contacts and connection terminals are connected, in other words This has the effect that if a connection failure occurs at even one location, power supply and data exchange will not be performed, and as a result, data can be reliably exchanged.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the memory cassette connection structure of this invention, FIG. 1 is an external view of the memory cassette of the same embodiment, and FIG. FIG. 3 is a circuit configuration diagram with a cassette connected. 1...Memory cassette, 3...Connection terminal group, 4.5...Power connection terminal, 15...
...Power supply, 16...RAM, 1□, 13.
14. ml, m2------Power line.

Claims (1)

[Scope of utility model registration request] A connection structure between a data processing device and a memory cassette in which data is exchanged and power is supplied by connecting multiple contacts of the data processing device and connection terminals provided on the memory cassette corresponding to the multiple contacts. In order to supply power from the power supply unit of the data processing device to the internal circuit of the memory cassette, the data processing device is provided with at least three power contacts spaced apart from each other, and the three or more power contacts The same number of power supply connection terminals are provided on the memory cassette corresponding to the power supply contacts, and a first power supply contact terminal of the memory cassette corresponding to a first power supply contact to which power is supplied from the power supply part among the power supply contacts A power supply connection terminal of the data processing device is directly wired to a second power supply connection terminal within the memory cassette, and a second power supply contact of the data processing device corresponding to the second power supply connection terminal is connected to the data processing device. Wired directly to a third power supply contact within the memory cassette, and wired so that power is supplied to the internal circuit of the memory cassette from a third power supply connection terminal of the memory cassette corresponding to the third power supply contact. A connection structure between a data processing device and a memory cassette.