JPS6233362A - Floppy disc control system - Google Patents

Abstract

PURPOSE:To attain prescribed access control by discriminating a type of a loaded floppy disc device based on the result discriminated by the 1st track signal discriminating section and the 2nd track signal discrimination section. CONSTITUTION:A command is given to a FD controller 10 so that the 1st seek command section 3 seeks a track having a prescribed track number or over. The tracks having the prescribed track number or over are set initially to distinguish plural kinds of tracks, while tracks of 1.2MB kind use up to the 48th tracks as a rule. In order to distinguish both the track kind, a track larger than the track 47 being a track number covered by 360KB and including the track 48 and smaller than it is sought. Thus, the kind of a floppy disc device is discriminated automatically and prescribed access control is attained through the setting.

Description

[Detailed Description of the Invention] [Summary] In a floppy disk control system configured to determine the type of a floppy disk device installed, a first seek command is issued to issue a command to seek to a track with a predetermined track number or higher. A command unit, a second seek command side that issues a command to seek to a track with a predetermined track number or less, and after completing the seek processing issued by this second seek command unit, the signal read by the head is set to a predetermined number. a first track signal determination unit that determines whether the signal is from a truck or a truck; a third seek command unit that issues a command to seek a predetermined track with a lower number; and this third seek command. a second track signal determining section that determines whether the signal read by the head is a signal from a predetermined track after completing the seek processing issued by the first track signal determining section; The type of the installed floppy disk device is determined based on the result determined by the second track signal determining section.

[Industrial application field]

- The present invention relates to a floppy disk control method that automatically determines and sets the type of floppy disk device.

[Conventional technology]

There are different types of floppy disk devices depending on the storage capacity, such as 360 KB and 1.2 MB. Since these different types of floppy disk devices must be controlled differently, they must be set in advance at startup. For example, a 360KB file generally uses tracks 0 to 40.

1.2MB is common! - Since racks 0 to 48 are used, it is necessary to control them in accordance with these types. For this reason, conventionally, it has been assumed in advance that the floppy disk device to be installed is, for example, a 360 KB device or a 1.2 MB device, and the setting is fixed, so to speak.

[Problem that the invention seeks to solve]

Conventionally, a fixed setting was made to perform control that matched the type of floppy disk device, so there was a problem in that a device of the type that matched the floppy disk device had to be installed. Another possibility is to check the type of floppy disk device installed when the power is turned on and set the control to match this type, but this poses the problem of having to individually configure settings that match the type when the floppy disk device is installed. A point occurs.

[Means for solving problems]

In order to solve the above problem, the present invention first issues a command to seek a track with a predetermined track number or more when the power is turned on. Second, a command is issued to seek a track below a predetermined track number. Third, a command is issued to seek a predetermined track that is less than or equal to a second predetermined track number. Fourthly, when the second and third seek commands are completed, the type of floppy disk device, for example 360KB or 1.2MB, is determined based on the read track numbers.
It is set to determine whether it is of type B or whether it is not installed, and to perform control in accordance with this determination.

Means for solving the problems will be explained using the configuration of one embodiment of the present invention shown in FIG. In the figure, 1 is an input/output control mechanism, 2 is a control unit, 3 is a first seek command unit, 4 is a second seek command unit, 5 is a third seek command unit, and 6 is a first track signal determination unit. Department.

7 is a second track signal discrimination section, 8.9 is a drive type table, 10 is an FD controller, 11-1.11
-2 is the drive, 12 is the CPU (central processing unit), 1
3 represents the main storage device.

In FIG. 1, the input/output control mechanism 1 is comprised of 2 to 9.

The first seek command unit 3 causes the heads constituting the drive (0) 11-1 and the drive (1111-2) to seek a track of a predetermined track number (for example, track '40') or higher, for example, track '48'. The command is issued to the FD controller 10 as shown in FIG.

The second seek command unit 4 moves the heads constituting the drive (0) 11-1, drives tll 1 +, -2 to a track below a predetermined track number, for example, track "1".
A command is issued to the FD controller 10 to seek.

The third seek command section 5 issues a command to the FD controller 10 to cause the heads constituting drives (0) 11 to 1 and drive +1111-2 to seek a predetermined track number, for example, track "O". It is something.

The first track signal determination unit 6 determines that the track number read by the head after completing the seek command issued by the second seek I command unit 4 is a predetermined track number 2, for example, track “O”. This is to determine whether or not.

The second track signal determination section 7 is connected to the third seek command section 5.
After completing the seek command issued by the head, the track number read by the head becomes the predetermined track number 1.
For example, it is determined whether the track is "0" or not.

Drive type table (fl) 8, drive type table (2) 9, first track signal determination unit 6
and the type determined by the second track signal determining section 7. Once, drive (0) 11
-1. After the type of drive (1111-2) has been determined, by referring to this table, it is possible to easily know which type it is.

[Effect]

By adopting a configuration as shown in FIG.

Drive (0) 11-], Drive +1111-
When 2 is newly connected to the FD controller IO and 5 is powered on, the input/output control mechanism 1 automatically determines the type according to the following procedure, and stores the determined type in the drive type table +118h and the drive. Type table (2) is set to 9.

First, the first seek command section 3 issues a command for the head to seek a track with a predetermined track number or higher.

Second, the second seek command unit 4 issues a command for the head to seek a track below a predetermined track number.

Thirdly, the third seek command section 5 issues a command for the head to seek a track smaller than the track number for which the second seek command was issued.

Fourth, at the respective points in time when the second and third seek commands are completed, the first track signal discriminator 6 and the second
The track signal determining unit 7 determines whether each track number read from the head is a predetermined one or not, thereby identifying the type. As a result, drive (0) 11-1
．． It becomes clear what type the drives (1) 11-2 are, and whether or not they are not installed. This determination result is.

Stored in drive type table (1) 8 and drive type table (2) 9. Using this stored content, drive (0) 11-1 and drive (11
11-2 are controlled respectively.

〔Example〕

FIG. 1 shows the configuration of one embodiment of the present invention. As described above, the input/output control mechanism 1 in the figure determines which type the drive (b) 11-1 and the drive (1111-2) are, or whether they are not installed.

This result is stored in the drive type table (1) 8 and the drive type table (2) 9, and in response to an access request from the CPU (central processing unit) 12, the FD controller 10 is given a predetermined control. It is used to send out signals, etc. The main t9 device 13 is C
It stores programs for controlling the PU 12, data, and the like.

Next, the operation of the configuration of one embodiment of the present invention shown in FIG. 1 will be explained in detail using the flowchart shown in FIG.

2 indicates a state in which the R/W head of the corresponding drive is sought to the track 48. In FIG. This means that the first seek command unit 3 issues a command to the FD controller 10 to seek a track with a predetermined track number or higher. What is a track with a predetermined track number or higher?

This is an initial setting to distinguish between multiple types. For example, the 360KB type.

In principle, up to track 40 is used, and up to track 47 may be used as a 2 o'clock reserve. On the other hand, 1.2M
Type B basically uses up to track 48. Therefore, in order to distinguish between the two types, 3.
Seek to track 48 (significant track number) that is larger than track 47, which is the maximum used track number of 60KB, and includes track 48, which is the maximum used track number of 1.2MB, and is smaller than this. It issues instructions to the In the 1.2 MB disk, the head seeks to the position of track 48 based on the seek command indicated by ■ in the figure. However, the 360 KB data is sought to the position of track 47 where the head can move to the maximum.

In the figure, ■ indicates a state in which the R/W head of the corresponding drive is sought to track 1. This means that the second seek command section 4 issues a command to the FD controller IO to seek track 1. Based on this seek command, the FD controller 10 moves to track 48, which is the seek command issued at ■ in Figure 1 due to its nature.
A seek is made in the direction of the smaller track number by the value of 47 degrees, which is the difference between the track l, which is the seek command issued at ■ in the figure, from the track l. That is, for the one of 1.2 MB.

Seek to track 48-track 47=tract (1). On the other hand, for 360KB.

Seek to track 47-track 47=track 0 (2).

In the figure, ■ indicates a state in which it is determined whether or not a track 0 signal is detected. If YES, execute ■ in Figure 9.

In the case of No, execute ■ in Figure 1. This means that it is determined whether the head has sought track 0 shown in (2).

2 in the figure indicates a state in which the track 0 shown in equation (2) was found to have been sought, and therefore the data was identified as being of the 360 KB type. this is.

This is executed by the first track signal determining section 6.

Then, execute ■ in Figure 2.

In the figure, ■ indicates a state in which the R/W head of the corresponding track is sought to track 0. This means that the third seek command section 5 issues a command to the FD controller 10 to seek track O. Based on this seek command, the FD controller 10 further causes drive (0) 11-1 and drive (1111-
Control 2.

In the figure, ■ indicates a state in which it is determined whether or not a track O signal has been detected.If YES, then ■ in Figure 9 is executed. N
In case o, execute ■ in Figure 2.

This means that it is determined whether the head has sought track 0 as shown in equation (11).

■■ in the figure indicates a state in which the data is identified as being of the 1.2 MB type because it has been found that the track 0 shown in equation (1) has been sought. this is.

This is executed by the second track signal determining section 7.

Then, execute ■ in Figure 1.

■ in the figure indicates a state in which it has been determined that the corresponding drive does not exist. This is performed by the second track signal determination section 7.

■ in the figure shows the detection results in the drive type table (l) 8
Alternatively, it shows a state in which the dry type table (2) is set in the 8 area of 9.

0 in the figure indicates a state in which it is determined whether all drives have been checked. If YES, the process ends. If No, switch to the next drive at ■ in Figure 2 and execute the following procedure at ■ in Figure 3.

As explained above, by executing the steps from ■ to ■ in Figure 1, the drive (0) 11-1 and drive (1111-2) installed in the FD controller 10 are
It is automatically determined which type it is or whether it is not installed, and the results are set in the drive type table (1) 8 and drive type table (2) 9, respectively.

Figure 3 shows drive (0) 11-1 and drive il+
An example of a combination of types for 11-2 is shown.

This assumes that at least one drive (0) 11-1 is installed. And “○” in 1 figure is 1
Examples of possible combinations of both drive types are shown below.

〔Effect of the invention〕

As explained above, according to the present invention, firstly.

A command is issued to seek a track with a predetermined track number or higher. Second, a command is issued to seek a track below a predetermined track number. Third, a command is issued to seek a predetermined track that is less than or equal to a second predetermined track number. and.

Fourth, when the second and third seek commands are completed, the type of floppy disk device, for example 360, is determined based on the read track numbers.
Whether it is of KB or 1.2MB type,
Alternatively, since it uses a configuration that determines whether or not the floppy disk is installed and sets it in the table, it can be configured to automatically determine the type of floppy disk device and perform predetermined access control. can do. Therefore, when a new floppy disk device with a different capacity is installed (connected), it is not necessary to make settings that match the nine types, and the settings can be made automatically.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is a flow chart explaining the present invention in detail, and FIG. 3 is an example of combinations of types. In the figure, 1 is an input/output control mechanism, 2 is a control section, 3 is a first seek command section, and 4 is a second seek command section. 5 is a third seek command section, 6 is a first track signal discrimination section, 7 is a second track signal discrimination section, 8.9 is a drive type table, 10 is an FD controller, 11-1.
11-2 is a drive, 12 is a CPU (central processing unit)
, 13 represents a main storage device. Patent Applicant: Alps Electric Co., Ltd. Representative Patent Attorney Hiroshi Mori 1) (and 3 others) Half-arm Akatsu 1 Embodiment Structure A “Figure 1 Type Association Seven-I 1 Figure 3

Claims (1)

[Scope of Claims] In a floppy disk control system configured to determine the type of an installed floppy disk device, a first seek command issues a command to seek to a track with a predetermined track number or higher of the installed floppy disk device. a second seek command unit that issues a command to seek to a track below a predetermined track number after completing the seek processing issued by the first seek command unit; and from the second seek command unit. a first track signal determination section that determines whether the signal read by the head is a signal from a predetermined track after completing the issued seek processing; and a seek processing issued from the second seek command section. After completing the seek processing, a third seek command unit issues a command to seek a predetermined track with a smaller number. After completing the seek processing issued from this third seek command unit, the signal read by the head is a second track signal discriminator for discriminating whether or not the signal is from a predetermined track; A floppy disk control method characterized in that the method is configured to determine the type of a floppy disk device.