JPS62177783A - Preventing device for abnormal insertion of memory cartridge - Google Patents

Abstract

PURPOSE:To prevent abnormal insertion by installing plural cartridge insertion detecting contacts on both sides of the electrical contact group of a memory cartridge or in their vicinity and reporting to a main body control part that the insertion detecting contact is normally touched. CONSTITUTION:The printed circuit board cartridge edge contact 13 of a cartridge block 14 and the card edge connector 12 of a main body system block 10 are detachably inserted and connected. Terminals 1a-6a are installed on the contact 13, and the connector 12 is provided with terminals 1b-6b. Here terminals 2a, 2b, 3a, 3b, 4a, 4b, 5a and 5b are normally necessary contacts, while terminals 1a, 1b, 6a and 6b are usually provided so as to sandwich the terminal group, and detect that the cartridge is inserted. A potential of +5V is transmitted to the contact 1a through the contact 1b, to the contact 6a through a protection switch 16 from the contact 1a, and to the input P of a control circuit 11 through the contact 6b from the contact 6a. Thus it is reported that contacts are normally touched.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a means for electrically detecting the contact state of a contact between a cartridge and a main body control part in an electronic device using a memory cartridge or the like.

(Summary of the Invention) The present invention provides the following features:
Alternatively, a plurality of cartridge insertion detection contacts are provided near both sides, and the logic level of the cartridge insertion detection contacts is detected by the main body control section to detect an abnormal insertion of the cartridge, and when an abnormality is detected, the main body control This is to prevent malfunction of the cartridge and data destruction in the cartridge memory.

(Prior Art) Conventionally, in electronic devices that use memory cartridges, such as electronic game devices, electronic musical instruments, and personal computer application products, the memory cartridges are mainly composed of semiconductor memories, and the memory contents are controlled by the main body control unit. Controlling software is often stored.

Generally, desired functions of the main body are often achieved by the user inserting a memory cartridge. in this case,
The memory cartridge and main unit control unit are electrically connected by a card edge type printed circuit board and a connector, etc., but because the user inserts it mechanically, there is a risk of inserting the memory cartridge diagonally or not inserting it enough. Because of this, there was no guarantee that all contacts would be completely connected. Therefore, in the past, a microswitch or the like was placed near the insertion [] on the main body side, and the microswitch was closed when the memory cartridge was completely inserted, and the main body control section determined the closed state of the microswitch. It was being processed.

(Problems to be Solved by the Invention) As described in the prior art section, the method of detecting the insertion state of a memory cartridge using a microswitch has the following drawbacks.

1. The price of the microswitch is high.

2. To prevent diagonal insertion, two microswitches must be placed on both sides of the contact group.

3. When arranging the microswitch on the main body side, consideration must be given to the insertion depth of the memory cartridge, and mechanical arrangement and adjustment of the microswitch is required.

(Means for Solving the Problems) The present invention does not use microswitches, but connects them to both sides or near both sides of a normal contact group. By providing an electrode having exactly the same shape as the point group 1a at n° and using this in the cartridge insertion detection terminal, it is possible to deal with insufficient insertion of the cartridge or oblique insertion.

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

FIG. 1 is a cartridge connection diagram of an embodiment of the present invention.

10 is a main body system block, 11 is a control circuit, 12 is a card edge connector, 13 is a printed circuit board card edge contact, 14 is a cartridge block, 15 is a static type RAM, 16 is a protection switch, 17 is a resistor, 18 is a diode, 19 is a It is a lithium battery. diode 1
8 and a lithium battery 19 are for battery backup of the static RAM.

In FIG. 1, terminals 1a to 6a are card edge type contacts, and terminals 1b to 6b are contacts of a card edge connector 12. In FIG. Also, 1a, 1b, 6a
, 6b are arranged at both ends of the contact group. Contact point 3a.

3b, 4a, and 4b make contact with normal data transfer lines or memory address lines.

Further, contact 2b supplies ground from the main body side to the cartridge side, and contact 5b supplies positive power (+5V in the figure) from the main body side to the cartridge side.

Contact 1b is fixed to +5V potential on the main body side.

The contact 1b on the car mill ridge side is connected to one end of the protection switch 16. The other end of the protection switch 16 is a resistor 17
and static type RAM1
5 and a contact 6a respectively.

The contact 2a is supplied to the ground terminal of the static RAM 15 and all ground points of the cartridge block 14. The contacts 3a and 48 are input to the static type RΔM15 as data lines or address lines. Contact 5
a is the VCC terminal of static RAM 15 and diode 1
8 are respectively connected to the cathode side. lithium battery 1
The negative side of 9 is grounded, and the positive side is connected to the anode end of diode 18.

Next, the contact 6b on the main body side is connected to the control circuit. (Indicated by P in FIG. 1) Here, the contacts 2a, 2b, 3a, 3b, 4a.

4b, 5a, and 5b are normally required contacts, and Ia, lb, 6a, and 6b are cartridge insertion detection terminals. The cartridge insertion detection terminals are usually provided on both sides of the connector section so as to sandwich the terminal group.

Next, the case of oblique insertion will be explained with reference to FIG. FIG. 2 is an external view when the cartridge (printed circuit board) is inserted obliquely.

20 is a cable connected to the main body side, and 12 is a card edge connector. Further, 13 is a group of card edge contacts.

If the cartridge is inserted obliquely, some of the contacts will make contact, but the remaining contacts will have poor contact. When the main body writes data to or reads data from the cartridge in this state, malfunctions on the main body side and erroneous writing on the cartridge side occur.

As shown in Fig. 1, by arranging insertion detection terminals on both sides of the contact group, when the contact is inserted normally, +5 V '78 is applied to the contact 1a via the contact 1b; The signal is transmitted from the contact 6a to the contact 6a via the protection switch 16 (the switch is in the interlock state at this time), and from the contact 6a to the P input of the control circuit 11 via the contact 6b. If the P input is at logic level "1", the control circuit 11 can detect that the cartridge has been inserted normally and that the protection switch is in the operating state. This determination allows normal data reading and writing.

Here, the protection switch 16 is generally called a protect switch, and is turned on when the cartridge is desired to be used. In other words, it can be closed or opened according to the will of the user. therefore,
Before the cartridge is inserted, the switch J3 is turned on and the static type RAM 15 is not selected. After inserting the cartridge, it is turned on according to the user's will, and only when the cartridge is inserted normally, the O8 terminal of the static RAM 15 goes to the level "
1”.

Next, when the cartridge is inserted diagonally as shown in FIG. 2, for example, the contacts 6a and 6b in FIG.

Here, if the P input is pulled down by a resistor in the control circuit 11, it is at logic level "0". If the control circuit 11 determines this logic level rOJ and prevents writing or reading from the cartridge, malfunctions will not occur.

In addition, the control circuit 11 determines the P input to
It is also possible to notify the user whether or not the cartridge is being used.

(Effects of the Invention) By implementing the present invention, the following effects can be expected.

1. The microswitch used in the past is no longer required.

(Cost reduction effect) 2. By arranging the cartridge insertion detection terminals at both ends of the normal terminal group, it is effective for oblique insertion on either the left or right side.

However, the cartridge is valid only when it is inserted parallel to the connector and correctly.
No malfunctions. Furthermore, erroneous data will not be written to the cartridge.

[Brief explanation of drawings]

FIG. 1 is a connection diagram of a cartridge according to the present invention, and FIG. 2 is an external view of the cartridge when it is inserted obliquely. 10... Main body system block 11... Control circuit 12... Card edge connector 13... Printed circuit board card edge contact 14... Cartridge block 15... Static type RAM 16... Protection switch 17...・Resistor 18...Diode 19...Lithium battery 1a-6a, 1b-6b...Contact 20...Wubble

Claims (1)

[Claims] In an apparatus for preventing abnormal insertion of a memory cartridge in an electronic device having a memory cartridge that can be attached or removed at will, the memory cartridge is configured to be connected to a main body control unit through a plurality of electrical contacts, and the plurality of electrical contacts are A device for preventing abnormal insertion of a memory cartridge, characterized in that a plurality of cartridge insertion detection contacts are provided on both sides or near both sides, and a main body control unit is notified that the insertion detection contacts are normally contacted.