JPH0215151Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a protection device for a computer system using a central control unit, such as a microcomputer. ) are arranged in a stacked manner and are connected to each other by a connector.

[Conventional technology]

In a system using a central control unit (hereinafter referred to as CPU) such as a microcomputer, an external device, such as a memory cartridge consisting of a semiconductor memory mounted on a printed board, is connected to the system body (where the CPU is installed) using a connector etc. There is a system in which memory can be easily added, functions can be changed, etc. by making it removable.

In such a system, when a memory cartridge is installed in the system main body, the memory cartridge is installed in the system main body before power is applied to the system main body, and when the memory cartridge is removed from the system main body, It is necessary to remove the memory cartridge from the system after cutting off the power to the system. If this order is incorrect, the system and the semiconductor elements (memory ICs, etc.) on which the memory cartridge is installed may be destroyed. be. In other words, in the connector,
This is because the order in which a large number of connector pins are connected and disconnected is generally different, so that excessive current may flow through signal lines (address bus, data bus, control line, etc.) when a memory cartridge is attached or detached.

[Problem that the invention attempts to solve]

As is clear from the above, there is a problem in that if a memory cartridge is inserted or removed while the system main body is powered on, the semiconductor elements in the system main body and the memory cartridge may be destroyed. To solve this problem, in computer systems that are configured so that a card-shaped device with a plug formed on the end of the printed board is inserted into the printed board connector of the system main body, conventionally, the ground Various systems have been proposed in which the lengths of the connectors, power connectors, and signal connectors are made to differ from each other in order to define the order in which the various connectors are connected when a card-shaped device is attached to or removed from the system body. However, in systems where the computer system main body and external devices are stacked in the direction of the surface of the printed board on which they are mounted, connections are made using plugs and printed board connectors formed directly on the printed board. Therefore, it is necessary to provide connectors on both the system main body and the external device, and to obtain electrical connection by coupling the connectors to each other. However, according to this method of connecting connectors by joining them together, making the contact order different between the plugs inside the connector is not only uneconomical, but also requires the connector itself to have a special structure. Unlike the above-mentioned card-shaped devices that are inserted and removed along guide rails, the connectors are often inserted and removed diagonally when connected to each other, and the angle of insertion and removal tends to be large. Even the use of connectors cannot completely prevent system destruction.

The present invention solves the above problems and provides a computer system in which external devices are stacked on the system main body, in which the semiconductor elements are not destroyed even if the memory cartridge is installed or removed while the power is on. The purpose is to obtain a protective device for

[Disclosure of invention]

For the above purpose, the present invention provides a switch means in the system body, and the operation of the switch means controls the connection/disconnection of the power supply of the system body or the connection/disconnection of the reset input of the CPU in the system body. , and the operation of the switch means is operated by the end of a component of the external memory (memory cartridge), for example, a printed circuit board, and the connector between the system main body and the external memory is connected and disconnected, and the switch means is operated. A time difference is set between the two.

[Configuration of Example]

FIG. 1 is a structural diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram of essential parts of an example of a system implementing the present invention.

As shown in FIG. 1, the system main body 1 includes a printed circuit board 101 on which a CPU 102 and various semiconductor elements are mounted and wired, and a connector 103 is installed at the location where a memory cartridge 2, which is an external memory, is installed. And a switch means, for example, a micro switch 104 is provided near this connector 103.
are each mounted and wired.

As shown in FIG. 2, the micro switch 104 is a reset terminal (RESET) of the CPU 102.
The CPU 102 is connected to the CPU 102 and is configured to connect/disconnect a reset input to the CPU 102. Or, if the CPU 102 does not have a reset terminal (RESET), symbol 1
As shown at 04', the micro switch 104
(In Fig. 2, the micro switch 10 is configured to connect/disconnect the power supply to the CPU 102 by opening the part marked with an
Connect 4'. Incidentally, even if the CPU 102 has a reset terminal (RESET), it is possible to adopt a method of inserting a micro switch 104' on the power supply side. ).

Further, as shown in FIG. 1, the memory cartridge (external memory) 2 includes one or more semiconductor memory elements, such as a read-only memory (hereinafter referred to as ROM) 202 and other various types, on a printed board 201. Semiconductor elements, etc. are mounted and wired,
Furthermore, a connector 203 is mounted and wired at a location corresponding to the connector 103 of the system main body 1. Further, the connector 203 side end 204 of the printed board 201 is connected to the drive element 10 of the micro switch 104.
It is formed so as to extend until it covers the tip of 5.

The positional relationship between both connectors 103, 203 and the driver 105 of the micro switch 104 is as follows:
At the beginning when the connectors 103 and 203 are electrically connected, the micro switch 104 is not activated. At the end of the process), the relationship is set such that the micro switch 104 is operating.

The above embodiment is an example in which the connector 203 is attached to the memory cartridge 2, but a direct connection conductor is formed at the end of the printed board 203 of the memory cartridge 2, and this part is attached to a system cabinet, etc. A so-called edge connector type system that is inserted into a connector (in most cases, the printed circuit board is vertical and slides on a rail to attach the unit to the system).
The present invention can also be implemented.

Furthermore, the external device connected to the system main body is not limited to a memory cartridge.

[Effect of the embodiment]

FIG. 3 is a diagram showing the state changes when the memory cartridge 2 is attached to and detached from the system body 1 in the embodiment of the present invention.

In FIG. 3, the states change in the order of A, B, and C when the memory cartridge 2 is removed, and the states change in the order of C, B, and A when the memory cartridge 2 is installed.

As shown in FIG. 2, the micro switch 104
When connecting the micro switch 104 to the reset terminal (RESET) of the CPU 102, the micro switch 104 should be kept open with the memory cartridge 2 installed in the system main body 1, and the micro switch 104 should be connected to the reset terminal (RESET) of the CPU 102. When connecting to the power supply path, the micro switch 10
4 is in a closed state when the memory cartridge 2 is attached to the system main body 1.

The following explanation uses the micro switch 104.
Let us take as an example the case where it is connected to the reset terminal (RESET) of the CPU 102.

FIG. 3A shows a state in which the memory cartridge 2 is installed in the system main body 1. In this state, as described above, the micro switch 104 has its driver 105 pressed against the printed board end 204 of the memory cartridge 2 and is open.
The reset terminal (RESET) of CPU102 is +Vcc
potential, and the CPU 102 is in an operating state.

FIG. 3B shows a state in which the memory cartridge 2 is being removed (extracted) from the system main body 1. In this state, as the memory cartridge 2 moves away from the system main body 1, the microswitch driver 105, which is held down by the printed board end 204, gradually returns to its original position, and eventually the microswitch 104 is activated. to close. At the moment when the microswitch 104 is activated, the electrical connection between the connectors 103 and 203 is still maintained due to the relationship explained in the above-mentioned "Configuration of the Embodiment".

When the micro switch 104 closes, the CPU 1
The reset terminal (RESET) of 02 becomes ground potential and the CPU 102 becomes inactive (reset state), and each signal line 105 is all open state (equivalent to being disconnected from the CPU 102).
becomes. That is, each signal line 105 is in an open state while the connector 103 and connector 203 are in an electrically connected state.

FIG. 3C shows a state in which the memory cartridge 2 is completely removed from the system main body 1.
At the moment when this state is reached, each signal line 105 is already in the open state as described above, so the ROM 202 in the memory cartridge 2
etc., excessive current will not flow through various semiconductor elements such as the signal line buffer IC (not shown) in the system body 1, and the system body 1 and memory cartridge 2 will
will not be destroyed.

When installing the memory cartridge 2 into the system main body 1, the operation is performed in the reverse order of removing it, and while each signal line 105 is maintained in an open state, the electrical connection between the connector 103 and the connector 203 is The connection is made and then the micro switch 104
is opened and the reset state of CPU 102 is released, so connector 103 and connector 2 are connected as before.
03 is electrically connected, an excessive current will not flow through the system main body 1 and the memory cartridge 2, and the system main body 1 and the memory cartridge 2 will not be destroyed.

Furthermore, depending on the type of CPU, there may be signal lines that do not go into the open state when the CPU is put into the reset state. In such a case, a method of inserting and connecting the microswitch 104 to the power supply path, which will be described later, may be used.

When connecting the microswitch 104 to the power supply path, a microswitch that closes when the memory cartridge 2 is attached to the system main body 1 is used, as shown by the symbol 104' in FIG. The time relationship between the connection between the connectors 103 and 203 and the operation of the microswitch 104 may be the same as described above.

In this case, when removing the memory cartridge 2 from the system main body 1, connect the connector 1
Before the electrical connection between 03 and 203 is broken, the micro switch 104' is activated, the power to the CPU 102 is cut off, the CPU 102 becomes inactive, and the memory cartridge 2 is inserted into the system main body 1. In this case, connector 103, 203
After the electrical connection between the two is made, the micro switch 104' is activated to connect the power to the CPU 102 and put the CPU 102 into operation. It will not flow, and therefore the system main body 1 and memory cartridge 2 will not be destroyed.

[Effect of idea]

As is clear from the above description, the present invention provides a computer system in which external devices configured separately from the system main body, such as memory cartridges, are stacked on the system main body. The system is designed so that the CPU of the system main unit is in an inactive state (reset state or power off state), and the work of attaching and removing external devices to the system main body is done while the system main unit's CPU is in an inactive state (reset state or power off state). The present invention has extremely great effects, such as being able to perform extremely simple operations without having to worry about switch operations, and eliminating the risk of system destruction.

[Brief explanation of the drawing]

Fig. 1 is a structural diagram showing an embodiment of the present invention, Fig. 2 is a main circuit diagram of an example of a system implementing the present invention, and Figs. It is a figure explaining the attachment and detachment process. Main symbols, 1...System body, 102...Central control unit (CPU), 103...Connector, 10
4,104'... Switch means (micro switch), 2... External device (memory cartridge), 2
02... Semiconductor element (ROM), 203... Connector, 204... Printed board end.

Claims (1)

[Claims for Utility Model Registration] 1. A system main body and an external device are each mounted and wired on a printed board, and are stacked in the direction of the board surface of each printed board, and the external device is mounted on the system main body. In a system that can be attached or detached by connecting a connector, the system body has a central part within the system body that is operated by the external device component when the external device is attached to or detached from the system body. A switch means is provided for setting the control device into an operating state or a non-operating state, and when an external device is attached to or detached from the system main body, the switch means is activated when the system main body and the external device are electrically connected through the connector. so that it works,
A protection device for a computer system, wherein a time difference is set between when the connector is connected and disconnected and when the switch means is activated. 2. The protection device for a computer system according to claim 1, wherein the switch means connects and disconnects the reset input to the central control unit. 3. The protection device for a computer system according to claim 1, wherein the switch means connects and disconnects the power supply to the central control unit. 4. The protection device for a computer system according to claim 1, wherein the external device is a memory device.