JP2000357079A - Computer system and control method for the same - Google Patents

Abstract

(57) [Problem] To realize a one-chip configuration of a controller for a peripheral device and a controller included in a PC main body that can be used only when an extension unit is used, without causing unnecessary power consumption of the PC main body. A dock for function expansion includes a PS /
2 connector 31, parallel connector (Paralle
l) 32 and a LAN connector (RJ45) 33 are provided. A controller for a device used by connecting to these connectors, that is, a keyboard controller (KB)
C) 12 PS / 2 control functions, gate array (GA) 1
8 I / O control function and LAN controller 20
Is built into the PC main body 200,
Together with other devices within it on a single chip. In addition, these controllers are
At the time of non-attachment of 00, the operation is set to the stop state, and wasteful power consumption can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a computer system and a control method of the system, and more particularly to a computer system removably mountable on an expansion unit and a control method of the system.

[0002]

2. Description of the Related Art In recent years, various notebook-type personal computers (hereinafter referred to as notebook PCs) which are easy to carry and can be operated by a battery have been developed.
The notebook PC is configured so that an expansion unit can be mounted as needed for expanding its functions. By attaching a notebook PC to this expansion unit and using it,
A notebook PC without compromising the portability of the notebook PC
Can be easily extended.

In recent years, there has been a demand for further reduction in the thickness of notebook PCs. For this purpose, various connectors (USB port, serial port, parallel port, LAN connector, modem connector, etc.) provided on the notebook PC body have been demanded. ) Is provided on the extension unit side, and the notebook PC body is equipped with only the minimum necessary connectors, or a connectorless configuration has begun to be used.
Since the miniaturization of connectors is physically limited, by providing these connectors with expansion units, P
The size and thickness of the C body can be reduced.

In this case, a controller for controlling peripheral devices used by being connected to the connector of the extension unit is generally provided not on the PC main body but on the extension unit side. It is impossible to use these peripheral devices only with the PC main unit because there is no connector in the PC main unit, and a controller for the peripheral device is unnecessary in the PC main unit. In addition, by providing the controller for the peripheral device on the extension unit side, it is possible to reduce unnecessary power consumption by the controller for the peripheral device when operating only on the PC main body.

[0005]

By the way, recently,
With the progress of semiconductor technology and high-density packaging technology, mixed integration of devices, in which a plurality of devices are integrated and formed on one chip, is being promoted. By reducing the number of components by this integrated integration, it is possible to significantly reduce the cost and the mounting area.

However, as in the prior art, the controller is a PC
In the configuration where the main unit and the extension unit are separated,
It is impossible to integrally form the controller in the C main body and the controller in the extension unit on one chip. For this reason, the conventional configuration in which a controller for a peripheral device that can be used only when the extension unit is used is provided on the extension unit side is not preferable in terms of integrating the controllers.

[0007] The present invention has been made in view of the above circumstances, and a controller for a peripheral device which can be used only when an extension unit is used and a controller provided in the PC main body, without causing unnecessary power consumption of the PC main body. It is an object of the present invention to provide a computer system capable of realizing a single chip and a control method of the system.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a computer system in which an expansion unit having a connector for connecting a peripheral device can be detachably mounted on a computer main body. Provided in the controller for controlling peripheral devices used by being connected to the connector of the extension unit, and provided in the computer main body, to detect whether the computer main body is attached to the extension unit, Control means for setting the controller to an operation state or an operation stop state according to the detection result.

In this computer system, the connector is provided not on the computer main body but on the extension unit side, but a controller for a peripheral device connected to the connector and used is built in the computer main body. For this reason, it is possible to realize a one-chip configuration of the controller for the peripheral device which can be used only when the extension unit is used and the controller of the computer main body. In addition, a controller for a peripheral device that can be used only when the extension unit is used is automatically set to an operation state or an operation stop state according to whether or not the computer main body is attached to the extension unit. Therefore, when the extension unit is not used, the operation of the controller for the peripheral device can be stopped, so that even if the controller for the peripheral device is built in the computer main body, unnecessary power consumption does not occur. Therefore, the number of components can be reduced by one chip without causing unnecessary power consumption of the computer main body.

In particular, since a network controller such as a LAN controller consumes a relatively large amount of power during operation, when the expansion unit is not used, the operation of the network controller is stopped to greatly reduce the amount of power consumption. It becomes possible.

[0011] Further, even if the extension unit is mounted, it is not known whether the user uses the network. Therefore, the user selects use / non-use of the function of setting the network control device to the operating state when the extension unit is mounted. It is preferable that a means for causing the network control device to be provided is provided, and when the non-use is selected, the above-described function is invalidated and the operation of the network control device is maintained in a stopped state regardless of whether or not the extension unit is mounted.

The present invention also provides a computer system in which a plurality of types of extension units having different types of connectors provided for connecting peripheral devices can be selectively mounted on the computer main body. A plurality of controllers provided, each corresponding to a peripheral device connectable to a connector of the plurality of types of expansion units, an identification unit for identifying a type of the expansion unit mounted on the computer main body, and the mounted expansion unit Means for determining a controller to be operated from among the plurality of controllers according to the identification result by the identification means so that only the controller corresponding to the connector is set to the operating state.

In this computer system, a plurality of controllers respectively corresponding to peripheral devices available when the extension unit is used are built in the computer main body. In this case, instead of setting all the controllers to the operating state when the extension unit is attached, the type of the attached extension unit is identified, and only the controller corresponding to the type is set to operate. Therefore,
Only the controller corresponding to the type of the extension unit to be used can be operated.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a computer system according to an embodiment of the present invention. This computer system is a notebook-type personal computer (hereinafter, referred to as a PC) that can be driven by a battery. The PC main body 100 can be detachably attached to a docker 200 that is an expansion unit for expanding its functions. It is configured. Both the PC body 100 and the docker 200 are connected by dedicated docking connectors 300 provided respectively.

The LAN docker 200 has various connectors for connecting peripheral devices, as shown in FIG.
PS / 2 connector 31, parallel connector (Paral
ell) 32 and a LAN connector (RJ45) 33 are provided. The PS / 2 connector 31 is used to connect input devices such as a keyboard / mouse of the PS / S specification. Parallel connector (Parallel) 32
Is used to connect Centronics-compliant devices such as printers and scanners. The LAN connector (RJ45) 33 is used for connecting a LAN cable. The connectors for these peripheral devices are not provided on the PC main body 100, and the devices connected to these connectors can be used from the PC main body 100 only by attaching the docker 200 to the PC main body 100. .

The LAN docker 200 includes an EEP
A ROM 34 and a LAN detection circuit 35 are provided. The EEPROM 34 stores ID information indicating the type of the LAN docker 200. By reading the ID information from the LAN docker 200, the PC body 100 can determine the type of connector supported by the LAN docker 200. LAN detection circuit 35
It detects whether a LAN cable is connected to the AN connector (RJ45) 33 and notifies the gate array (GA) 18 of the detection result.

As shown in the figure, a bus 10, a CPU module 11, a keyboard controller (KBC) 12, a gate array (GA) 13 having integrated functions for power control and various system management, a VGA Controller 15, Modem 16, Sound controller 17, Gate array (GA) 18 integrating various I / O controllers and docker control functions, Q switch (Q-SW) 19, and L
An AN controller 20 is provided.

The CPU module 11 controls the operation of the entire system and executes data processing.
Here, a CPU, a cache, and a bus bridge are mounted. Keyboard controller (KB
C) 12 controls a built-in keyboard of the PC main body 100 and a keyboard and a mouse connected to the PS / 2 connector 31 of the docker 200. When the docker 200 is mounted, a keyboard controller (KB)
C) 12 is connected to the PS / 2 connector 31 of the docker 200 via the docking connector 300.

The VGA controller 15 includes an LCD and an external C used as a display monitor of the system.
It is a display controller that controls the RT. The gate array (GA) 18 is for controlling various I / O devices and docker control as described above. When the docker 200 is mounted, the gate array (GA) 18 is connected to the docker 200 via the docking connector 300. Parallel connector (Parallel) 32, EEPROM
34. Also, a gate array (GA) 18
Is a detect signal (DETEC) for detecting the attachment (dock) / removal (undock) of the docker 200.
It is also connected to the T) line. When the docker 200 is mounted, a detect signal (DETECT) is output from the docker 20.
By being connected to the ground terminal of 0, the level changes from high level to low level. On the other hand, when the docker 200 is detached, the detect signal (DETECT) is separated from the ground terminal of the docker 200.
Changes from a low level to a high level due to the pull-up resistor inside. Such a detect signal (DETEC)
Based on the potential change of T), the gate array (GA) 18
Detects the attachment (dock) / removal (undock) of the docker 200.

Further, the gate array (GA) 18
By monitoring the detection signal from the AN detection circuit 35, it can be determined whether or not the LAN cable is actually connected to the LAN connector (RJ45) 33.

The Q switch (Q-SW) 19 is an internal PC.
This is a switch circuit for connecting / disconnecting the I bus 10 and the LAN controller 20 and a gate array (G
A) On / off control is performed by a switch control signal from 18. Turning on the Q switch (Q-SW) 19 enables the PC 100 to use the LAN controller 20.

The LAN controller 20 includes a docker 20
A network controller (network interface) for connecting the PC body 100 to the LAN via the LAN connector (RJ45)
At the time of mounting 00, the LAN controller 20 is connected to the LAN connector (RJ45) 33 of the docker 200 via the docking connector 300.

The docking connector 300 is physically 1
The connector includes signal pins corresponding to all connectors of the docker 200.

In the system shown in FIG. 1, a LAN connector (RJ45) 33 is provided on the docker 200 and the PC body 100 is not provided with a LAN connector.
The LAN function cannot be used only by the PC main body 100. Therefore, in the conventional system, the LAN controller is built in the docker in order to avoid unnecessary power consumption. However, in this state, the LAN controller is connected to the other gate array 18 and the VGA controller 1.
5, cannot be integrated together with Modem16, Sound17, etc., which limits chip integration. In the present embodiment, by incorporating the LAN controller 20 in the PC main body 100, integration with other gate arrays becomes possible. For example, the portion indicated by the integration possible area 300 including the bus 10 is realized as a one-chip LSI.

The same applies to the keyboard controller 12. Since the PS / 2 connector 31 is provided by the docker 200, the PS / 2 device cannot be used only with the PC main body 100. However, by incorporating the keyboard controller 12 having the PS / 2 control function into the PC main body 100, other functions are possible. Integration with the gate array 13 and the like becomes possible. In addition, a PC card slot is provided in the docker 200, and a PC card controller is connected to the PC main body 10.
A configuration provided within 0 may be applied. Even in this case, the PC card controller can be integrated with another gate array in the PC main body 100.

Further, the docker 200 can be constituted by almost only a connector, and a compact docker can be realized.

(Control of Power Supply of Controller) In the system shown in FIG. 1, when only the PC main body 100 is used, a plurality of unused controllers are provided in the main body 100.
There is a danger of unnecessarily consuming power. Therefore,
This embodiment has the following power management functions.

That is, the LAN controller 20 that can be used only when the docker 200 is mounted is connected to the main bus 10 via the Q-SW 19 as described above.
By turning off the Q-SW 18, the LAN controller 20 can be disconnected from the bus 10. As a result, the LAN controller 20 is no longer recognized by the operating system.
0 can be stopped, and power consumption can be suppressed.

The operation of a controller that cannot be separated from the bus, for example, the keyboard controller 12 shown in FIG. 1, is stopped by turning off the power of the entire controller 12 or only its PS / 2 control function unit. The same applies to the I / O control function of the gate array 18.

(System Control) Next, referring to FIG.
A control method of the present system will be described. FIG. 2 shows the relationship between the state transition of the present system and the power management function.

In the present embodiment, the PC main body 100 has the following two states.

Only the PC body (undocking state) Docking state (operation of the PC body only) “PC body only” is a state in which the PC body 100 is not connected to the docker 200. 1) In this state, when the PC body 100 is powered on, the gate array 18 detects that the docker 200 is not mounted. This detection result is notified to the system BIOS which is a program for controlling the hardware of the PC main body 100.
Under the control of the system BIOS, the gate array 18 performs control for stopping (turning off) the operation of a controller that can be used only when the docker 200 is mounted. As for the OFF state, the power supply is stopped as described above, the controller is disconnected from the bus by Q-SW or the like,
For a controller having a sleep state with low power consumption conforming to the I specification, a technique of setting the power supply state to a sleeve (for example, D3 state) can be used.
By controlling in this manner, power consumption for an unusable controller can be reduced.

2) In addition, the system BIOS uses a method such as not reporting resources to the operating system (OS) for controllers that can be used only when the docker 200 is attached, so that the controllers are not recognized by the OS. I do. That is, for a controller that requires the docker 200, the operating system (OS) recognizes that the controller (device) does not exist in the PC body 100. this is,
For example, it can be realized by the following method. For PnP devices that support plug and play, PnP
Do not report resources. In the case of a PCI device, the device ID is hidden. When a Q-SW or the like is provided, the controller is disconnected from the bus. Since the LAN controller 20 is a PCI device, the Q switch (Q
By turning off the (-SW) 19, it is possible to control the presence of the LAN controller 20 so that the operating system cannot recognize it.

(Docking process) 1) Detection of docking event: When the PC main body 100 is mounted on the docker 200 in the state of "PC main body only", the gate array 18 detects that the docker 200 is mounted, The dock process of the system BIOS is started by an interrupt from the gate array 18.

2) Turn on the controller: In the docking process, the gate array 18 is controlled under the control of the system BIOS.
Performs control for setting a controller that can be used only when the docker 200 is mounted to the operating state (ON). As for the ON process, the Q-SW is turned on to connect the controller to the main bus. Start power supply. For example, the power supply state may be set to the D0 state.

3) Re-recognition of system configuration: system BI
The OS notifies the OS that the system configuration has changed,
Select a controller that can be used only when the docker 200 is installed.
Let S recognize. Thereby, the state shifts to the “docking state”.

(During Operation in Docking State) In the “docking state”, a device connected to the connector of the docker 200 can be used by using a controller that can be used only when the docker 200 is mounted. Even when the PC body 100 is powered on with the docker 200 mounted, the state shifts to the “docking state”.

(Undock Processing) 1) Detection of Undock Event: When the docker 200 is removed in the “docking state”, the gate array 18 detects that the docker 200 has been removed, and the gate BIOS 18 interrupts the system BIOS. Is started. in this case,
Actually, the system BIOS notifies the OS that the dock is to be disconnected (the OS unloads a driver or the like relating to the dock device), and after permission from the OS,
The undocking process of the system BIOS is started.

2) Controller OFF: In the undocking process, the gate array 18 is controlled under the control of the system BIOS.
Performs control for setting a controller that can be used only when the docker 200 is mounted to an operation stop state (off).
For the OFF processing, the power supply is stopped, the controller is disconnected from the bus by Q-SW or the like,
For example, the power supply state may be set to the D3 state.

3) Thereafter, the system BIOS notifies the OS of the undock end.

As described above, in this embodiment, the presence / absence of the docker 200 is detected, and the process of setting the controller to the operating state (ON) as shown in FIG. As shown in FIG. 3B, a process of setting the controller to the operation stop state (off) is performed.
Therefore, when the docker 200 is not in use, the operation of all the peripheral device controllers can be stopped. Therefore, even if the peripheral device controller is built in the PC main body 100, unnecessary power consumption does not occur. .
Therefore, the number of components can be reduced by one chip without causing unnecessary power consumption of the PC body 100.

In particular, since the power consumption of the LAN controller 20 during operation is relatively large, the power consumption can be greatly reduced by stopping the operation of the LAN controller 20 when the docker 200 is not used. Become. Even if the LAN docker 200 is attached, it is not actually known whether or not the user uses the network. Therefore, whether or not the function of setting the LAN controller 20 to the operating state when the docker 200 is attached is used or not used. Is preferably selected by a user on a setup screen of the system BIOS. FIG. 6 shows an example of the setup screen in this case.

As shown in FIG. 6, the setup screen of this embodiment is provided with "PCI LAN" setting items in addition to normal system setting items.
The setting item “PCI LAN” includes a LAN detection function (LAN DIRECTION) that automatically sets the LAN controller 20 to an operating state when the docker 200 is mounted.
This is for allowing the user to select use / non-use of N). The default value is “Used” indicating use, but can be changed by the user to a value indicating non-use.
When the non-use of the LAN detection function (LAN DITIONION) is selected, the operation of the LAN controller 20 is stopped regardless of whether or not the docker 200 is attached.

The system setting information set on the setup screen is stored in a CMOS memory or the like in the PC main body 100. The procedure of the dock processing executed by the system BIOS is as follows.

When the attachment of the docker 200 is detected, the system BIOS first refers to the system setting information to check whether the LAN detection function is used or not.
If "Use LAN detection function" is selected,
As described above, the Q switch (Q-SW) 19 is turned on, and the presence of the LAN controller 20 is notified to the operating system. As a result, the LAN controller 20 enters an operation state. On the other hand, when “Non-use of LAN detection function” is selected, the system BIO
The S keeps the Q switch (Q-SW) 19 in the off state and does not report the presence of the LAN controller 20 to the operating system. This can reduce unnecessary power consumption due to the LAN controller 20 being set to the operating state even though the LAN is not used. Also, LA by operating system
Since the recognition processing of the N controller 20 can be omitted, the dock processing can be performed at high speed. Therefore, if "non-use of the LAN detection function" is selected, the docker 200 can be used immediately as an I / O adapter.

The docking process may be performed only when the LAN is actually available by detecting the presence or absence of a LAN cable connection based on a detection signal from the LAN detection circuit 35. in this case,
The gate array (GA) 18 receives a detect signal (DET).
ECT) and the detection signal from the LAN detection circuit 35 to determine whether or not the LAN is usable. When a change from the LAN usable state to the LAN unusable state or the reverse state change occurs, This is notified to the system BIOS by an interrupt signal to the CPU 11 or the like. The system BIOS refers to the register in the gate array (GA) 18 and detects the detect signal (DETECT) and the LAN.
The value of the detection signal from the detection circuit 35 is checked to determine whether the LAN can be used. Then, if the LAN is available, the Q switch (Q-SW) 19 is turned on, and the LAN controller 2 is sent to the operating system.
Report the presence of 0. On the other hand, if the LAN is unusable, the Q switch (Q-SW) 19 is turned off,
The operating system reports that the LAN controller 20 is no longer present.

As described above, if the LAN detection circuit 35 is used, the LAN controller 2 is connected to the LAN controller (RJ45) 33 in accordance with the establishment or non-establishment of the condition that the LAN cable is connected to the LAN connector (RJ45) 33.
It is possible to control the operation state / operation stop state of 0.

(Control when Using a Plurality of Dockers) Next, with reference to FIGS. 4 and 5, system control when using a plurality of types of dockers 200 selectively will be described.

FIG. 4 shows two types of dockers (Docker #A and Docker #B) having different types of mounted connectors.
200 is shown. Docker #A is equipped with only PS / 2 connector 31, while docker #B is equipped with PS / 2 connector 31 and parallel connector (Parallel) 3
2. Equipped with LAN connector (RJ45) 33.
In this case, the docker #A EEPROM 34
ID information (ID1) indicating that the docker is equipped with only the / 2 connector 31 is stored.
EEPROM 34 holds ID information (ID2) indicating that the docker is equipped with a PS / 2 connector 31, a parallel connector (Parallel) 32, and a LAN connector (RJ45) 33.

In the docking process, the E
The ID information is identified from the EPROM 34, and only the controller suitable for the docker is set in a usable state from among a plurality of controllers included in the main body. The processing procedure for that is shown in FIG.

When the PC body 100 is powered on with the docker 200 connected, or when the PC body 1
When the docker 200 is connected while the power supply 00 is powered on, the system BIOS performs the following docking process.

First, the system BIOS controls the gate array 18 to read the ID from the EEPROM 34 of the docker.
Information is read (step S101). Then, the type of the currently mounted docker is determined based on the ID information (step S102). If ID = 1, the system BIOS determines that a docker equipped with only the PS / 2 connector 31 is attached, and
Only the controller suitable for the type of the current docker is set in the operable state from among the plurality of controllers of the main body 100, and the OS recognizes it (step S10).
3). Specifically, P in the keyboard controller 12
The S / 2 control controller is set in an operable state, and the parallel port control I / O in the gate array 18 is set.
The O controller and the LAN controller 20 are set to the operation stop state.

On the other hand, when ID = 2, the system BIOS includes the PS / 2 connector 31, the parallel connector (Parallel) 32, and the LAN connector (RJ4).
5) It is determined that the docker equipped with 33 is mounted, and only the controller suitable for the current docker is set to the operable state from among the plurality of controllers of the PC main body 100, and the OS recognizes it ( Step S10
4). Specifically, P in the keyboard controller 12
The controller for S / 2, the I / O controller for parallel port control in the gate array 18, and the LAN controller 20 are set to the operation stop state.

Thus, instead of setting all the controllers to the operating state when the docker 200 is mounted, the type of the mounted docker 200 is identified, and only the controller corresponding to the type is set to operate. This enables more efficient power supply control.

In this embodiment, the PS / 2 connector 31 and the parallel connector (Par) are provided only in the docker 200 but not in the PC body 100.
all) 32 and the LAN connector (RJ45) 33 are illustrated, but other connectors such as a USB connector and a SCSI connector may be used in the docker 200.
Only, and those controllers are
Can be adopted.

[0056]

As described above, according to the present invention,
A peripheral device controller and P which can be used only when using an expansion unit without incurring unnecessary power consumption of the PC
It is possible to realize a one-chip configuration with the controller included in the C main body, and it is possible to reduce the number of components.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a computer system according to an embodiment of the present invention.

FIG. 2 is an exemplary view showing a relationship between a state transition of the system and a power management function in the embodiment.

FIG. 3 is an exemplary view schematically showing a state of system control during docking and undocking in the embodiment.

FIG. 4 is an exemplary view for explaining two types of dockers used in the embodiment.

FIG. 5 is an exemplary flowchart showing the procedure of system control when a plurality of types of dockers are used in the embodiment.

FIG. 6 is an exemplary view showing an example of a setup screen used in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... CPU module 12 ... Keyboard controller 18 ... Gate array 19 ... Q switch 20 ... LAN controller 31 ... PS / 2 connector 32 ... Parallel connector 33 ... LAN connector 34 ... EEPROM 100 ... PC body 200 ... Docker 300 ... Docking connector

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toru Hanada 3-3-1, Shinmachi, Ome-shi, Tokyo Toshiba Computer Engineering Co., Ltd. F-term (reference) 5B076 AA03 AA05

Claims (11)

[Claims] 1. A computer system in which an extension unit having a connector for connecting a peripheral device can be detachably attached to a computer main body. The computer system is provided in the computer main body and used by connecting to a connector of the extension unit. A controller for controlling peripheral devices to be provided, provided in the computer main body, detecting whether or not the computer main body is attached to the extension unit,
Control means for setting the controller to an operation state or an operation stop state according to the detection result. 2. The computer system according to claim 1, wherein the controller is formed integrally with other devices in the computer main body. 3. The control device further comprises a switch provided between the controller and a bus in the computer main body, wherein the controller turns on the switch when the extension unit is mounted. 2. The controller is connected to the bus by setting the switch unit to off, and when the extension unit is not mounted, the switch unit is set to an off state to disconnect the controller from the bus. Computer system. 4. The control means sets the controller to a power-on state when the expansion unit is mounted, and sets the controller to a power-off state when the expansion unit is not mounted. The computer system according to claim 1, wherein: 5. A computer system in which an extension unit having a connector for connecting to a network is removably attachable to a computer main body. The computer system is provided in the computer main body, and is provided for connection to a network through a connector of the extension unit. A network control device for performing control, provided in the computer main body, detecting whether the computer main body is attached to the extension unit,
Control means for setting the network control device to an operation state or an operation stop state according to the detection result. 6. The apparatus further comprises means for allowing a user to select use / non-use of a function of setting the network control device to an operation state when the extension unit is mounted, and when the non-use is selected, 6. The computer system according to claim 5, wherein the network controller is configured to maintain the operation stop state regardless of whether or not the extension unit is mounted. 7. A plurality of types of extension units having different types of connectors provided for connecting peripheral devices,
A computer system that can be selectively mounted on the computer main body; a plurality of controllers provided in the computer main body and corresponding to respective peripheral devices connectable to connectors of the plurality of types of extension units; and a plurality of controllers mounted on the computer main body. Identification means for identifying the type of the expansion unit, and a controller corresponding to the connector of the mounted expansion unit, so that only the controller corresponding to the connector of the mounted expansion unit is set to the operating state. Means for determining a controller to be operated. 8. A computer main body detachably mountable to an extension unit having a connector for connecting a peripheral device, wherein a peripheral device used by being connected to the connector of the extension unit is provided in the computer main body. A control method for a computer system including a controller for controlling, the method including: detecting whether the computer main body is attached to the extension unit, and setting the controller to an operation state or an operation stop state according to the detection result. A control method characterized in that: 9. A network control which comprises a computer main body detachably attachable to an expansion unit having a connector for connecting to a network, and performs control for network connection in the computer main body through a connector of the expansion unit. A method for controlling a computer system incorporating a device, comprising: detecting whether or not the computer main body is attached to the extension unit; and setting the network control device to an operation state or an operation stop state according to the detection result. Characteristic control method. 10. When the extension unit is mounted, which of the use and non-use is selected by referring to setup information for selecting use / non-use of a function of setting the network control device to an operation state. 10. The control method according to claim 9, wherein when the non-use is selected, the operation of the network control device is stopped regardless of whether or not the extension unit is attached. . 11. A computer main body to which a plurality of types of extension units having different types of connectors provided for connecting peripheral devices can be mounted, and a connector of the plurality of types of extension units is provided in the computer main body. A method for controlling a computer system including a plurality of controllers respectively corresponding to connectable peripheral devices, comprising: identifying a type of an extension unit attached to the computer main body, and corresponding to a connector of the attached extension unit. A control method comprising: determining a controller to be operated from among the plurality of controllers according to the identification result so that only the controller is set to an operation state.