JPH08137588A - Computer system - Google Patents

Abstract

PURPOSE: To make a BIOS and a ROM common by disciminating which of a three-mode FDD and a two-mode FDD is the FDD connected with a computer main body. CONSTITUTION: Which of a three-mode FDD 18 and a two-mode FDD 19 the FDD mounted on a computer main body is in is discriminated by detecting the voltage of the gland pin P1 of an FDD port 17. According to the discrimination result, the procedure of the disk access control by a disk driver is switched. Therefore, the same BIOS and ROM 15 become possible to be commonly used between the type corresponding to the three-mode FDD and the type corresponding to the two-mode FDD.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to portable computer systems, and more particularly to a computer system improved to support both 3-mode floppy disk drives and 2-mode floppy disk drives.

[0002]

2. Description of the Related Art In recent years, various portable personal computers such as laptop type and notebook type have been developed. This type of personal computer is roughly classified into a model compatible with a 3-mode floppy disk drive (hereinafter referred to as a 3-mode FDD) and a model compatible with a 2-mode floppy disk drive (hereinafter referred to as a 2-mode FDD).

The three-mode FDD has 720 Kbytes, 1.
It supports three types of storage capacities of 2 Mbytes and 1.44 Mbytes, and is installed mainly in domestic models. On the other hand, 2-mode FDD has 720K bytes and 1.4
It supports two types of storage capacity of 4 Mbytes, and is mainly installed in overseas models.

However, in the conventional personal computer, the F
No function is provided to identify whether the DD is a 3-mode FDD or a 2-mode FDD. Therefore, in the past, which of the three-mode FDD and the two-mode FDD was used.
Depending on the model that supports D, the type of system ROM mounted on it has been changed.

That is, a model compatible with the three-mode FDD has a system R including a disk driver for the three-mode FDD.
OM is installed, and 2 for models that support 2-mode FDD
System RO including disk driver for mode FDD
M is implemented.

[0006] As described above, conventionally, the system RO for the three-mode FDD-compatible personal computer and the system RO for the two-mode FDD-compatible personal computer are different.
It was necessary to prepare M, and it was not possible to share the system ROM between the personal computer compatible with 3-mode FDD and the personal computer compatible with 2-mode FDD.

Further, the system RO implemented in this way
Since the FDD type that can be supported is determined depending on the type of M, one model can be used only in one of the 3-mode FDD and the 2-mode FDD. For this reason, users can use the same model to perform 3-mode FDD.
It was not possible to selectively use the two-mode FDD.

[0008]

In the conventional personal computer, it was not possible to discriminate whether the FDD mounted on the computer body was a 3-mode FDD or a 2-mode FDD. For this reason, a 2-mode personal computer compatible with 3-mode FDD
It is necessary to prepare separate system ROMs for the mode FDD-compatible personal computer and the 3-mode FDD-compatible personal computer and 2-mode FD.
System RO with D compatible personal computer
There is a drawback that M cannot be shared.

Since only one of the three-mode FDD and the two-mode FDD can be used in one model,
There was a drawback that the degree of freedom in system configuration was low. The present invention has been made in view of such a point, and the FDD mounted in the computer body is a 3-mode FDD and a 2-mode FDD.
It is an object of the present invention to provide a computer system capable of identifying which one of D is.

Further, according to the present invention, the same system R is identified by discriminating whether the FDD installed in the computer main body is a 3-mode FDD or a 2-mode FDD.
It is an object of the present invention to provide a computer system capable of selectively executing a control routine of a 3-mode FDD and a 2-mode FDD stored in an OM.

[0011]

A computer system according to the present invention includes a computer main body, a floppy disk connector provided in the computer main body, a 3-mode floppy disk drive device, and a 2-mode floppy disk drive device. An interface cable provided corresponding to one device and connecting the corresponding device to the floppy disk connector, the device and the floppy disk connector when the corresponding device is connected to the floppy disk connector. According to the voltage of the predetermined pin of the floppy disk connector, an interface cable configured to be electrically separated from a predetermined pin among a plurality of power or ground pins included in
The three-mode floppy disk drive device and the two
Drive type detecting means for detecting which one of the mode floppy disk drive devices is connected to the floppy disk connector.

In this computer system, 3
The voltage of a predetermined pin of the floppy disk connector is different when the mode floppy disk drive device is connected and when the 2-mode floppy disk drive device is connected so that the voltage of the 3-mode floppy disk drive device and that of the 2-mode floppy disk drive are different. The interface cable corresponding to either one of the devices, for example, the device of the 3 mode floppy disk drive device has been improved, and when the 3 mode floppy disk drive device is connected to the floppy disk connector,
Electrical isolation is provided between the device and a predetermined pin of the floppy disk connector.

Therefore, by detecting the voltage of a predetermined pin of the floppy disk connector, the FDD installed in the computer main body can detect the 3-mode FDD and the 2-mode FD.
It is possible to identify which one is D.

The present invention further comprises a system ROM for storing a driver program for controlling the 3-mode floppy disk drive device and the 2-mode floppy disk drive device, wherein the driver program detects the drive type. According to the detection result of the means, the disk access is controlled by using a processing procedure corresponding to one of the three-mode floppy disk drive and the two-mode floppy disk drive.

In this computer system, whether the FDD installed in the computer body is a 3-mode FDD or a 2-mode FDD is identified by detecting the voltage of a predetermined pin of the floppy disk connector. The disk access control procedure by the driver program is switched according to the. Therefore, the same system ROM can be commonly used by the model compatible with the 3-mode FDD and the model compatible with the 2-mode FDD. In addition, 3 mode FDD and 2 mode F
Since the DD can be selectively used in the same machine, it is possible to increase the degree of freedom in system configuration.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a computer system according to an embodiment of the present invention. This computer system is a laptop or notebook type portable personal computer system, and as shown in the drawing, a CPU 11, a system controller 12, a system memory 13, a floppy disk controller (FDC) 14, a BIOS ROM 15, a CMO.
The S memory 16 and the FDD port 17 are provided.

The CPU 11 controls the operation of the entire system, and executes various programs on the system memory 13. Local bus 10 of this CPU 11
A system controller 12 is connected to 0. The system controller 12 is a gate array for controlling all the memories and I / O in the system, and an FDD type status register 121 is provided therein.

FDD type status register 121
Is a dedicated register used for identifying the FDD type. In this FDD type status register 121,
FDD type status data "1" or "0" according to the voltage value of a specific pin P1 in the connector of the FDD port 17 is set by hardware.

In this case, if the voltage value of the specific pin is the logic "H" level, the FDD type status data "1" is set and the voltage value of the specific pin is the logic "L".
If it is a level, FDD type status data "0" is set. The pin P1 is one of a plurality of ground pins defined in the FDD port 17.

FDD type status data "1" is F
Indicates that the 3-mode FDD 18 is connected to the DD port 17, and the FDD type status data “0” indicates F
It shows that the 2-mode FDD 19 is connected to the DD port 17.

The system memory 13 is a main memory of this system, and stores an operating system (OS), application programs to be executed, and processing data.

The FDC 14 receives a disk access request from the CPU 11 through the system bus 101, and is connected to the FDD port 17 in response to the request 3
It controls the mode FDD 18 or the bimode FDD 19.

The BIOS ROM 15 is used as a system ROM, and stores an IRT routine executed at power-on, a system BIOS for hardware control including various drivers, and the like.

The IRT routine is a routine for initializing and testing the hardware. This IRT routine includes an FDD type check routine as shown. The FDD type check routine is F
This is executed at the time of initialization of the FDD connected to the DD port 17, and detects the FDD type (3 mode FDD / 2 mode FDD) connected to the FDD port 17.

This detection processing is performed by reading the FDD type status data set in the FDD type status register 121 by hardware. The value of the read FDD type status data is written in a predetermined storage position of the CMOS memory 16 as an FDD type status flag.

The system BIOS includes a disk driver routine called by using the software interrupt INT13h of the CPU 11. This disk driver routine is executed by the FDC 14 in response to a request from a host program (OS, application program).
By setting various control parameters to the 3 mode FDD 18 or 2 mode FDD 19 of the FDD port 17
Control disk access.

This disk driver routine (INT1
3h) has a function for controlling the disk access of both the 3-mode FDD 18 and the 2-mode FDD 19. That is, the disk driver routine INT13h
Includes a disk access routine commonly used for the three-mode FDD and the two-mode FDD, and a disk access routine specific to the three-mode FDD.

The disk access routine specific to the three-mode FDD includes a 1.2M / 1.44M byte type setting switching function and a motor rotation speed control function. These three mode FDD specific disk access routines are
It is selectively executed according to the contents of the FDD type status flag so that it is executed only when the FDD type status flag "1" indicating the 3-mode FDD is set in the CMOS memory 16.

The CMOS memory 16 is a battery backed up by an original battery, and here,
Various system environment setting information including the aforementioned FDD type status flag is stored.

The FDD port 17 is an FDD connector provided on the computer main body, and here is a three-mode FD.
The D18 and the 2-mode FDD 19 can be selectively connected via the corresponding interface cables 181, 191. Each of the 3-mode FDD 18 and the 2-mode FDD 19 is, for example, a 3.5-inch FDD, and these are internal FDs housed in the computer main body.
It may be either D or an external FDD externally attached to the computer body.

3-mode FDD 18 and 2-mode FDD
When 19 is an internal FDD, the FDD port 17 is provided in the FDD mounting slot of the computer body. When the 3-mode FDD 18 and the 2-mode FDD 19 are external FDDs, as shown in FIG.
The D port 17 is one side surface 201 of the computer main body 200.
It is provided above, and the 3-mode FDD 18 and the 2-mode FDD 19 are selectively connected thereto via the corresponding interface cables 181, 191.

Next, referring to FIGS. 3 and 4, the three-mode FDD 18 and the two-mode FDD 19 and the FD, respectively.
The interface with the D port 17 will be described. FIG. 3 shows a state in which the 2-mode FDD 19 is connected to the FDD port 17, and FIG. 4 shows the 3-mode FDD 18 connected to the FDD port 17.
The state of being connected to the DD port 17 is shown.

3-mode FDD 18 and 2-mode FDD 19
The host interface is basically the same, and there is a DS (DENSITY SELECT) signal line,
MEDIA signal line, data input / output signal line, power supply signal line,
And a plurality of signal lines such as a ground signal line are defined.

The MEDIA signal line from the 2-mode FDD 19 indicates whether the FD attached to the 2-mode FDD 19 is a 2HD medium or a 2DD medium. Similarly, for the MEDIA signal line from the 3-mode FDD 18, the FD inserted in the 3-mode FDD 18 is 2HD media or 2D.
It is shown as D media. The type of media is 3.4
It is determined by the presence or absence of a notch provided in the inch FD.

That is, the 2HD media is provided with a notch, and when the presence of this notch is detected, the inserted FD is recognized as the 2HD media and the MEDI
The A signal line is set to the "L" level. On the other hand, when the presence of the notch is not detected, the inserted FD is 2
It is recognized that the media is DD media, and the MEDIA signal line is set to "H" level.

The DS signal line transmitted from the FDC 14 to the 2-mode FDD 19 is used to set the 2-mode FDD 19 to either the mode corresponding to 740 Kbytes (2DD) or the mode corresponding to 1.44 Mbytes (2HD). used. In this case, the 2-mode FDD 19 is 740 Kbytes (2D) when the DS signal line is at “L” level.
D), the mode corresponds to 1.44 Mbytes (2HD) at the "H" level.

The DS signal line transmitted from the FDC 14 to the 3-mode FDD 18 has a 3HD in which a 2HD FD is inserted.
Mode Used to set FDD 18 to either the mode corresponding to 1.2 Mbytes or the mode corresponding to 1.44 Mbytes. In this case, the 3-mode FDD 18 becomes a mode corresponding to 1.2 MB when the DS signal line is at "L" level, and 1.44 when it is at "H" level.
The mode corresponds to M bytes.

As described above, the three-mode FDD 18 and the two-mode FDD 19 are different only in the meaning of the DS signal line, and the functions of the other signal lines are all the same. Therefore, normally, the voltage of the ground pin P1 is at the same "L" level when either the 3-mode FDD 18 or the 2-mode FDD 19 is connected, and the voltage of the 3-mode FDD 18 and the 2-mode FDD 18 is the same.
It is not possible to detect which of the DDs 19 is connected.

Therefore, in this embodiment, the voltage of the pin P1 of the FDD port 17 is different when the 3-mode FDD 18 is connected and when the 2-mode FDD 19 is connected, so that the 3-mode FDD 18 and the 2-mode FDD 19 are connected. An improvement is made on one of the devices, here, the interface cable 181 corresponding to the 3-mode FDD 18.

That is, as shown in FIG.
Interface cable 1 compatible with mode FDD18
In 81, one ground wiring corresponding to the pin P1 is cut among the plurality of ground wirings defined therein, and the three-mode FDD 18 is connected to the FDD port 17
The pin P1 is configured to be maintained in a floating state even when it is connected to.

In this case, the voltage of the pin P1 is raised to the "H" level by the pull-up resistor R on the system board, whereby the FDD type status data "1" is set in the FDD type status register 121.

On the other hand, as shown in FIG. 3, the interface cable 191 corresponding to the 2-mode FDD 18 is used.
With respect to, all the ground wirings are normally arranged, and when the two-mode FDD 19 is connected to the FDD port 17, the pin P1 is grounded. So in this case,
The pin P1 voltage goes to "L" level, which causes FD
FDD type status data “0” is set in the D type status register 121.

Incidentally, instead of cutting the ground wiring corresponding to the pin P1 on the interface cable 181, the internal wiring of the 3-mode FDD 18 is improved so as to correspond to the pin P1 as shown in FIG. The ground wiring may be separated from the internal ground terminal. In this way, the same interface cable can be used for the 3-mode FDD 18 and the 2-mode FDD 19.

Also, instead of the ground pin P1, FDD
It is also possible to utilize one of the power pins of port 17. In this case, the power supply pin may be made floating by the internal wiring of the interface cable 181 or the 3-mode FDD 18, and a pull-down resistor may be provided between the pin and the ground terminal. By doing this, similarly to the case of using the ground pin P1,
It is possible to detect which of the 3-mode FDD 18 and the 2-mode FDD 19 is connected.

Next, referring to FIG. 6, the three-mode FDD1
The difference in control between the 8-mode and 2-mode FDD 19 will be described. In the 2-mode FDD 19, only the data transfer speed is different between the 1.44M byte mode and the 720K byte mode, and the motor speed is 300 in both modes.
It is RPM.

On the other hand, in the three-mode FDD 18, it is necessary to switch the motor rotation speed in addition to switching the data transfer rate. That is, in the case of 1.44 Mbyte mode, the data transfer rate is 500 KBPS and the motor speed is 3
Must be set to 00 RPM. In the 1.2M byte mode, the data transfer rate is 500KBPS,
It is necessary to set the motor rotation speed to 360 RPM, and to set the data transfer rate to 300 KBPS and the motor rotation speed to 300 RPM in the 720 Kbyte mode.

As described above, the three-mode FDD 18 is different from the two-mode FDD 19 in that control of the motor rotation speed is required. Next, an operation procedure for FDD control in the system of FIG. 1 will be described with reference to the flowcharts of FIGS.

FIG. 7 shows the procedure for the FDD type detection process executed by the FDD type check routine. The FDD type check routine is incorporated in the IRT routine as described above, and is executed when the system power is turned on as a part of the initialization process for checking the system configuration.

That is, the FDD type check routine first reads the FDD type status data from the FDD type status register 121 of the system controller 12, and according to the value of the read FDD type status data, the FDD port 17 is connected to the FDD port 17. The type (steps S101 and S1)
02).

If the read FDD type status data is "1", the FDD type check routine returns 3
It is judged that the mode FDD 18 is connected and the FDD of "1" indicating that the 3 mode FDD 18 is connected
The type flag is written in the CMOS memory 16 (step S103).

On the other hand, if the read FDD type status data is "0", the FDD type check routine judges that the 2-mode FDD 19 is connected, and
The FDD type flag of "0" indicating that the mode FDD 19 is connected is written in the CMOS memory 16 (step S104).

Thereafter, the value of the FDD type flag written in the CMOS memory 16 is referred to by the disk driver every time the FDD is accessed. FIG. 8 shows the procedure of the FDD access control processing performed by the disk driver. This disk driver is realized by using the software interrupt of the CPU 11 as described above, and is called when the OS or application program executes the interrupt instruction (INT13h), and performs the following processing.

That is, the disk driver first sets C
The FDD type flag of the MOS memory 16 is read, and it is determined which of the 3-mode FDD 18 and the 2-mode FDD 19 is the control target according to the value of the read FDD type flag (steps S201, S202).

If the read FDD type flag is "1", the disk driver is 1.2M / 1.
The routine proceeds to the 44M setting processing routine. 1.2M / 1.4
The 4M setting processing routine refers to the input value set in the AH register of the CPU 11 and determines whether the function requested by the OS or the application program is the 1.2M / 1.44M setting function specific to the 3-mode FDD. It is determined (step S203). AH register =
If 70h, the 1.2M / 1.44M setting function is executed (step S204).

In this step S204, the three-mode FD is
The control of D18 is switched to a mode (1.2M type mode or 1.44M type mode) specified by the user using, for example, a setup process, and the parameter value indicating the mode is stored in the FDD status area of the system memory 13. Written.

On the other hand, when the 2-mode FDD 19 is connected, or even when the 3-mode FDD 18 is connected,
When a function other than 0h is requested, the disk driver proceeds to the processing of step 205, where the disk driver executes the function corresponding to the function code set in the AH register (step S205).

The functions corresponding to the function codes other than 70h are the common functions of the 3-mode FDD and the 2-mode FDD. However, with respect to functions involving disk access (read / write / verify / omatting, etc.), control is different between the three-mode FDD and the two-mode FDD, and motor rotation speed control is required only for the three-mode FDD. .

FIG. 9 shows the procedure of read / write / verify / formatting processing performed by the disk driver. The function code set in the AH register is 02h / 03h / 04h / 0
In the case of 5h, the following processing is executed for read / write / verify / formatting.

That is, 02h / 03h is stored in the AH register.
If either / 04h or 05h is set, the disk driver first instructs the FDC 14 to perform a seek operation on the target track (step S30).
1). At this time, the FDD is instructed to start the motor rotation, and the motor starts to rotate. The motor rotation speed at this time is set to the same value as the motor rotation speed used in the previous disk access.

Next, the disk driver reads the FDD type flag from the CMOS memory 16 and based on the value of the read FDD type flag, the FD to be controlled.
It is determined whether D is a 3-mode FDD or a 2-mode FDD (step S305).

If the FDD type flag is "0", that is, if the control target FDD is the two-mode FDD, step S30
The process proceeds to the data transfer rate setting process of No. 8. On the other hand, FD
If the D type flag is "1", that is, if the control target FDD is the three-mode FDD, the motor rotation speed control processing routine is executed prior to the data transfer rate setting processing in step S308 (steps S305 to S307).

The motor rotation speed control processing routine sets the motor rotation speed for the three-mode FDD (step S).
305). In this case, for example, in the read process and the write process, the motor rotation speed is set by trial and error. That is, when the motor rotation speed (= 300 RPM) corresponding to the 2DD medium is set at first and the read / write processing fails, the F of the system memory 13 is read this time.
According to the mode information written in the DD status area, the motor rotation speed (= 3
00 RPM / 360 RPM) is set.

On the other hand, in the case of the formatting process or the like, first, the media type determination process is performed according to the logic level of the MEDIA signal line output from the FDD, and the motor rotation speed is set according to the determination result. In this case, if it is confirmed that the 2HD medium is the FD of the system memory 13 by the confirmation processing.
According to the mode information written in the D status area, the motor speed corresponding to 2HD media (= 300
RPM / 360 RPM) is set.

Thereafter, the motor rotation speed control processing routine determines whether or not the current motor rotation speed is different from the motor rotation speed newly set in step S305 (step S306). Waits for (step S307). This time waiting is performed to wait for a period until the motor rotation speed of the FDD is changed and stabilizes at a new rotation speed. If the current motor speed and the motor speed newly set in step S305 are the same, the time waiting process in step S307 is not executed.

After the motor speed control processing is completed,
The disk driver performs a data transfer rate setting process (step S308). The setting process of the data transfer rate is also carried out by trial and error in the case of the read process and the write process as in the case of setting the motor rotation speed. That is, initially, the data transfer rate (= 300 KBS) corresponding to the 2DD medium is set, and if the read / write processing fails, the data transfer rate (= 500 KBS) corresponding to the 2HD medium is set this time.

After that, the disk driver accesses the FD medium and checks whether the access processing is successful (steps S309 and S310). If the access fails, the processing from step S301 is performed again.

In this way, steps S305 to S307
The motor rotation speed control process of is executed only when the FDD to be controlled is the three-mode FDD, and is not executed when the two-mode FDD is controlled.

As described above, in this embodiment, F
By detecting the voltage of the ground pin P1 of the DD port 17, it is identified whether the FDD installed in the computer body is the 3-mode FDD 18 or the 2-mode FDD 19, and the disk access control by the disk driver is performed according to the identification result. The procedure can be switched. Therefore, the same BIOS ROM 15 can be used as a 3-mode FDD.
It is possible to commonly use the compatible model and the model compatible with the two-mode FDD.

[0069]

As described above, according to the present invention, by detecting the voltage of the predetermined pin of the FDD port, the FDD mounted in the computer main body can operate in the three mode F.
It is possible to discriminate between the DD and the two-mode FDD. Further, by switching the disk access control procedure by the driver program according to the identification result, the same system ROM can be commonly used between the model compatible with the 3-mode FDD and the model compatible with the 2-mode FDD. .

[Brief description of drawings]

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

FIG. 2 is an external view showing an example of a connection state between a computer main body and an FDD in the embodiment.

FIG. 3 is a diagram showing an interface between a two-mode FDD and an FDD port in the embodiment.

FIG. 4 is a diagram showing an example of an interface between a three-mode FDD and an FDD port in the embodiment.

FIG. 5 is a diagram showing another example of the interface between the 3-mode FDD and the FDD port in the same embodiment.

FIG. 6 is a three-mode FDD and a two-mode F in the same embodiment.
The figure for demonstrating the difference of the control form with respect to DD.

FIG. 7 is a flowchart showing a procedure of FDD type detection processing in the embodiment.

FIG. 8 is an exemplary flowchart showing a procedure of FDD access control processing performed by the disk driver in the embodiment.

FIG. 9 is a flowchart showing a procedure of read / write / verify / formatting processing performed by the disk driver in the embodiment.

[Explanation of symbols]

11 ... CPU, 12 ... System controller, 13 ... System memory, 14 ... FDC, 15 ... BIOS RO
M, 17 ... FDD port, 18 ... 3-mode FDD, 19
... 2-mode FDD, 121 ... FDD type status register, P1 ... Ground pin.

Claims (7)

[Claims] 1. A computer main body, a floppy disk connector provided on the computer main body, and a device provided corresponding to any one of a 3 mode floppy disk drive device and a 2 mode floppy disk drive device. An interface cable for connecting a device to the floppy disk connector, the predetermined device among a plurality of power or ground pins included in the device and the floppy disk connector when the corresponding device is connected to the floppy disk connector. An interface cable configured to be electrically separated from the pins, and the 3-mode floppy disk drive device and the 2-mode floppy disk according to the voltage of the predetermined pin of the floppy disk connector. And a drive type detecting means for detecting which one of the drive devices is connected to the floppy disk connector. 2. A system ROM storing a driver program for controlling the 3-mode floppy disk drive device and the 2-mode floppy disk drive device, wherein the driver program is the 3-mode floppy disk drive device. A first routine commonly used for disk access control of both of the two-mode floppy disk drive devices; and a second routine used only for disk access control of the three-mode floppy disk drive device, 2. The computer system according to claim 1, wherein the second routine is configured to be selectively used according to the detection result by the drive type detecting means. 3. The second routine comprises a motor rotation speed control routine for the three-mode floppy disk drive, and two modes of operation of the three-mode floppy disk drive: a 1.2 MB type and a 1.44 MB type. 3. The computer system according to claim 2, further comprising a mode setting routine for setting one of the two. 4. A computer main body, a memory device for storing various system environment information, and a three-mode floppy disk drive device and a two-mode floppy disk drive device which are provided in the computer main body and selectively connected via an interface cable. A floppy disk connector, a register for storing data corresponding to a voltage value of a predetermined pin among a plurality of power supply or ground pins included in the floppy disk connector, and data from the register in response to power-on. Read and write drive type information indicating which of the 3 mode floppy disk drive device and the 2 mode floppy disk drive device is connected to the floppy disk connector to the memory device according to the read data. Means and in response to a floppy disk access request from the operating system or application program, the drive type information of the memory device is referred to, and the floppy disk connector is connected to the floppy disk connector by a procedure corresponding to the drive device of the type indicated by the drive type information. And a means for controlling a connected drive device. 5. The means for controlling the drive device includes a driver program stored in a system ROM, the driver program accessing the disk of both the 3-mode floppy disk drive device and the 2-mode floppy disk drive device. A first routine that is commonly used for control, and a second routine that is used only for disk access control of the three-mode floppy disk drive device, wherein the second routine is the drive type of the memory device. The computer system according to claim 4, wherein the computer system is configured to be selectively executed according to information. 6. A computer body, a floppy disk connector provided on the computer body, and a floppy disk drive device connected to the floppy disk connector, the device being connected to the floppy disk connector. A floppy disk drive device in which wiring between the device and a predetermined pin among a plurality of power supply pins or ground pins included in the floppy disk connector is electrically separated, and the floppy disk connector And a drive type detecting means for discriminating the type of the floppy disk drive device according to the voltage of the predetermined pin. 7. The drive type detection means detects whether the connected floppy disk drive device is a 3-mode floppy disk drive device or a 2-mode floppy disk drive device. 7. The computer system according to claim 6, wherein: