JPH0225211B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for additionally inserting an expansion pack or the like into an electronic device such as a desktop computer.

For desktop electronic computers, etc., the basic configuration is made as small as possible, and in order to increase the scale of the computer according to the customer's request, for example, a lead that stores a program for processing trigonometric functions is used.・Function ROM packs equipped with only memory (ROM) or interface packs configured with interface processing mechanisms for processing external terminal devices, etc. are prepared, and the above-mentioned computer is equipped with multiple slots (holes) for inserting these packs, and by inserting the above packs into these slots, you can basically expand a relatively small desktop computer into a higher-level computer. used. However, when inserting this pack into the slot of a computer, the computer must be powered off once.
If you do not insert the above-mentioned packs after turning it off, the electrical circuit inside the pack may be destroyed, or malfunctions may occur due to noise in the signal line etc. when the pack is inserted inside the above-mentioned computer, resulting in unexpected damage. I will receive it.

Additionally, turning off the power to the desktop computer in order to insert the above packs requires erasing already stored programs and calculation data, or temporarily evacuating them to non-volatile memory. No.

The present invention provides a method for inserting packages into a computer without turning off the power in order to avoid the above-mentioned accidents and trouble for the operator.

The present invention will be explained below using an embodiment of the method of the present invention shown in the drawings.

In FIG. 1, a logic board 2 is mounted inside a pack 1, and on this logic board, for example, a ROM (read only memory) for trigonometric functions and its peripheral electric circuits are mounted. A connector 4 is provided in the computer for electrical connection to the logic board 2 inside the pack 1 when the pack 1 is inserted into the desktop computer. Inside the above-mentioned computer, there is also an ON/OFF switch at the position indicated by the dashed-dotted line in the figure, a little before the insertion opening of the above-mentioned connector 4.
A micro switch 3 is installed to detect.

Therefore, when the pack 1 is inserted into the slot of the computer, the outer wall of the pack first pushes the detection rod of the microswitch 3 upward, turning the contact of the microswitch 3 ON. When the pack is further inserted deeper, the contact portion 16 of the logic board 2 inside the pack is inserted into the connector 4 of the computer, and the connector 4 and the contact portion 6 of the logic board are joined. Then, when the pack is inserted to the deepest point, the detection rod of the micro switch enters the groove 5 cut out on the top of the pack, and the micro switch is activated.
Return to the direction of OFF.

FIG. 2 shows an example of the electric circuit configuration of the present invention. When the above micro switch 3 is turned ON after the pack is inserted, the output A passes through one stage of the amplifier.
is further input to the one-shot OS1. This OS
1 is triggered at the falling edge of signal A. The output from this one shot side and signal A are input to AND gate 8. The waveforms of this signal A, OS1, and the output of gate 8 are shown in FIG. This gate 8
The output signal is input to the tri-state control gates (circuits connected to the second signal line) of tri-state receivers 9 to 12, and microswitch 3 is turned on. The state control gate input signal becomes 0 level as shown in 8 in Figure 3,
The output terminals of the tri-state receivers 9 to 12 become high impedance, and no matter what kind of noise enters the input signal from the connector 4, the signal is not transmitted to the inside of the computer. Moreover, the output signal of this AND gate 8 is sent to the driver 13.
Since it is also included in the tri-state control gate (circuit connected to the second signal line) of ~15, the output terminal from connector 4 (connection body) is also high when micro switch 3 is in the ON state. This creates impedance and prevents the signal from being transmitted to the outside, ie, to the inserted pack. When the pack 1 is completely inserted, the detection rod of the micro switch 3 enters the groove 5, and the micro switch 3 returns to the OFF state. That is, signal A is 1
become the level. However, since the microswitch has chattering, OS1 operates even when the microswitch is turned off. Therefore, as shown in FIG. 3, the output of the AND gate remains at the 0 level from the time the microswitch 3 is turned on until a time period of OS1 has passed since the microswitch 3 is turned off. That is, the input/output interface circuit is kept inactive from the time when the pack is inserted until after the time of OS1 after the insertion is completely completed. Also, signal A is one shot circuit OS2
is also entered. The output of Q of this OS2 and A are
The signal is input to the NAND gate 16. This output signal is input to the base of transistor Q1. By this transistor, transistor Q2
Turns ON/OFF. This transistor Q2 is a transistor for supplying power to the inserted pack via the first signal line. That is,
When the output signal of the NAND gate 16 is 0, this transistor Q2 is turned off and no power is supplied to the insertion pack. To explain with Figure 3, when the micro SW turns ON, that is, when the pack starts to be inserted, the micro SW turns OFF, and then
Transistor Q2 remains OFF until after the time of OS2. That is, by not supplying power to the pack from the start of insertion to the end of complete insertion, destruction of the electrical circuit within the pack is prevented. In addition, the time constants T _{1 and} T ₂ of the one-shot OS1 and OS2, which are the timekeeping means, are T1>
By setting it to T2, the computer side will set the tri-state control of the line driver and receiver to 1 after the power is completely supplied to the pack and the circuit condition inside the pack has calmed down. As a result, the computer side accepts I/O signals and starts outputting after the insertion pack side is completely in a normal state, so no malfunction is detected.

As described above, when the present invention is used, various signal lines except the power circuit are first connected in response to the insertion of a pack, and then power is supplied to the pack, so power is supplied to the pack. It is possible to remove signal line noise that occurs when various signal lines are connected in the same state. In other words, if the pack is inserted as described above, the signal transmission/reception circuit between the pack and the inside of the desktop computer is completely disconnected during the insertion operation, and there is no need to provide any damage protection to the inside of the computer. . Furthermore, the power supply to the pack is completely disconnected during insertion, so there is no risk of destroying the electrical circuit inside the pack. Further, after the insertion is completely completed, power is supplied and the signal becomes active after a certain period of time, so that malfunctions due to electrical instability that occur immediately after power supply does not occur. In this way, it is very beneficial without imposing unnecessary attention on the operator.

[Brief explanation of drawings]

FIG. 1 is an example of the mechanical configuration of the present invention, FIG. 2 is an example of the electrical configuration of the present invention, and FIG. 3 is a timing chart thereof. In the figure, 1... Pack, 2... Logic board inside the pack, 3... Micro switch, 4... Connector inside the computer, 5... Groove of the pack, 6
...Printed circuit board contact section, 7...Amplifier,
8...AND gate, 9, 10, 11, 12...
Tri-State Line Receiver, 13,
14, 15...Tri-state line driver, 16...NAND gate.

Claims (1)

[Scope of Claims] 1. An electronic device in which a circuit pack comprising a storage element and its peripheral electric circuit is removably installed and a device is used to transmit signals between the circuit pack, a detection means for detecting whether the circuit pack is in the middle of installation or has just been completed; and when the detection means detects that the circuit pack is in the middle of installation, the circuit of the electronic device transmits a signal. 1. An electronic device, characterized in that the electronic device is brought into a stopped state, and when it detects that the mounting is completed, the electronic device supplies power to the circuit pack from the electronic device side and then executes the signal transmission. 2. The electronic device according to claim 1, wherein the detection means includes a switch operated by a groove formed in a predetermined position of the circuit pack.