JPS6358661A - Identifying circuit for type of floppy disk - Google Patents

Abstract

PURPOSE:To attain the high-speed and proper control of a floppy disk by providing a controller which controls the corresponding floppy disk in response to the type of the floppy disk discriminated by a discriminating device. CONSTITUTION:The state of a switch corresponding to a relevant floppy disk is read by a switch read control circuit 6. When the switch is turned off, a floppy disk control clock 9 is set in response to an A type floppy disk by a floppy disk control clock switching circuit 8. Then an initializing instruction corresponding to the A type disk is written to a floppy disk control LSI 10. While if the switch is not turned off, the circuit 8 sets the clock 9 in response to a B type floppy disk. Then an initializing command corresponding to the B type disk is written to the LSI 10. Thus a starting action ends for the disk. In such a way, the type of a disk is identified without actuating the disk and therefore the processing speed is increased with a floppy disk.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a type identification circuit for a floppy disk used as an external storage device in a computer system.

[Prior Art] When controlling a floppy disk, the control program must change the control procedure depending on the type of floppy disk connected to the computer, that is, the type of storage capacity and data transfer speed.

Conventionally, a method for identifying the type of floppy disk has been to actually operate the floppy disk using control procedures compatible with several types of floppy disks, and to select a control procedure that is error-free.

FIG. 4 is a flowchart showing an initialization method in a conventional floppy disk control circuit to which two types of floppy disks, A type and B type, are connected.

By the way, in order to control a floppy disk, it is first necessary to initialize the floppy disk. In order to correctly perform this initialization, it is necessary to know what type of floppy disk the user wants to control, determined from its storage capacity, data transfer speed, etc.

However, in the past, information about floppy disks connected to computers was not available, so in order to identify the type of floppy disk,
It was necessary to make a decision by actually operating a floppy disk.

That is, as shown in the flowchart of FIG. 4, first in step (3-1), the floppy disk control clock is changed to correspond to the A-type floppy disk,
In step (3-2), the floppy disk control LS
Write the initialization command corresponding to the type A floppy disk to I. Next, in step (3-3), start the floppy disk, read the data on the floppy sheet, and then proceed to step (3-4). to determine whether the floppy sheet was read correctly, and if it was read correctly, the startup is terminated.

On the other hand, if it cannot be read correctly, step (3-5)
), move on to floppy disk control FloraCla, B
In step (3-6), an initialization command corresponding to the B-type floppy disk is written to the floppy disk control LSI, and the startup is completed.

[Problems to be Solved by IJI] Since the conventional floppy disk initialization method is performed as described above, there is a problem in that it takes a lot of time to identify the type of floppy disk.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a floppy disk type identification circuit that can identify the floppy disk type in a short time.

[Means for Solving the Problems] The floppy disk type identification circuit according to the present invention has an identification value set in the floppy disk control circuit by a switch or the like in accordance with the type that is distinguished from the storage capacity of the floppy disk. The identification value is read from the CPU to determine the type of floppy disk, and the floppy disk is controlled according to the type.

[Function] The floppy disk type identification circuit in this invention identifies the floppy disk type based on the High or Low value of a switch etc. read from the CPU, so that the floppy disk control circuit and control program can identify the floppy disk type. Control the corresponding floppy disk fast and properly according to.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a conceptual configuration diagram of this invention, and in the figure,
(1) is a CPU that controls the entire control circuit, (11) to 14) are floppy disks Nos. 1 to 4, (
15) is the above floppy disk (11) or 1
Type identification value setting means (16) is for identifying a type distinguished from a storage capacity of 0, etc.; and (16) is a discriminating means for determining the identification value set in advance by the type identification value setting means (15).

(17) is a control means for controlling a corresponding floppy disk according to the type of the floppy disk determined by the first determining means (16).

1: In the configuration described above, type identification value setting means (15)
Now, let's take a look at the floppy disk (11) connected to the computer.
) to 14), the identification value is set in advance according to the type. When this is read from CPU (1), 1
The determination is made by the determination means (16), and based on the determination result, the corresponding floppy disk among the floppy disks (11) to 14) is initialized and controlled quickly and appropriately.

FIG. 2 shows a flow diagram of a floppy disk type identification circuit embodying the above conceptual configuration diagram.

In the figure, (2) to 4) show examples of the type identification means (15) of FIG. 1, which are type identification switches added according to the present invention. The type identification switches (2) to 4) correspond to floppy disks No. 1 to No. 4, respectively. (6) is a switch readout control circuit also added according to the present invention, which is configured to read the state i8+ of the type identification switch (2) or 4) from the CPU (1),
It constitutes a part of the discriminating means (16) shown in FIG.

(7) is a clock generation circuit which is the source of the floppy disk control clock, and (8) is a floppy disk control clock switching circuit, which switches the floppy disk control clock according to instructions from the CPU (1).

(9) is the floppy disk control clock, (10)
is a floppy disk control LSI that controls the floppy disk according to instructions from CPIJ (1), which includes zero or more components, namely, a clock generation circuit (7), a floppy disk control clock switching circuit (8), and a floppy disk control circuit. The control means (17) shown in FIG. 1 is composed of the floppy disk control clock (9) and the floppy disk control LSI (10).

(11) to 14) are floppy disks connected to a computer (not shown).

There are two types of floppy disks in the above floppy disks (11) to 14) depending on their storage capacity, and for the purpose of explaining this embodiment, they will be referred to as type A floppy disks and type B floppy disks. .

Specifically, a type A floppy disk has a storage capacity of 500
A kilobyte floppy disk is used, and the B-type floppy disk is a floppy disk with a storage capacity of 1.6 megabytes.

Therefore, when reading data from or writing data to a floppy disk, it is necessary to implement the following items in advance using a floppy disk control program.

■Initialization of the floppy disk control LSI ■Setting the clock for floppy disk control The settings for the above items must be performed separately for each type of floppy disk connected to the computer. You need to know the type in advance. In this invention,
Switch readout circuit and (6) and switch 1 (
2) or switch 4 (5) is added to the floppy disk type identification circuit to solve the above problem.

Next, the operation of the above embodiment will be explained.

First, switch 1 (2) to switch 4 (5) correspond to floppy disk No. 1 (11) to floppy disk No. 4 (14), respectively, as described above, and each switch 1 (2) or switch 4 (5) is
It can be set to either ON or OFF, and the ON or OFF state is determined by the switch readout control circuit (6).
This allows the CPU (1) to read the data when necessary.

That is, depending on the ON/OFF state of switch 1 (2) to switch 4 (5), the potential of the switch becomes Lo.
Fixed to w or old gh. Therefore, when the state of the switch is read by CPU (1), it is "0" or "1" depending on the ON or OFF state of the switch.
”.In other words, by associating the switch status with the type of floppy disk connected to the computer in advance, the floppy disk control program can read the switch status and read the floppy disk type. You can know the type.

Here, for example, the state where the switch is OFF is defined as an A-type floppy disk, and the state where the switch is ON is defined as a B-type floppy disk, and floppy disk No. 1 (11),
Use A-type floppy disks for floppy disk No. 2 (12), and floppy disk drive 3.
No. (13), floppy disk drive No. 4 (14)
Let us take as an example the case where each type B floppy disk is used.

In such a case, switch 1 (11), switch 2 (1
2), switch 3 (13), switch (
14) are set to ON.

Next, an initialization method using the floppy disk type identification circuit set as described above will be explained with reference to FIG.

First, in step (2-1), the state of the switch corresponding to the floppy disk to be used is read out by the switch readout control circuit (6), and in step (2-1)
-2), it is determined whether the switch is OFF, and if the switch is OFF, step (2-2) is determined.
3) is the floppy disk control clock switching circuit (8
) controls the floppy disk control clock (9),
Set it to support type A floppy disks.

Next, the Stella 7' (2-4) writes an initialization command corresponding to the A-type floppy disk into the floppy disk control LSI (10).

On the other hand, in step (2-2), the switch is turned OFF.
If it is not FF, the process moves to step (2-5), and the floppy disk control clock switching circuit (8) sets the floppy disk control clock (9) to correspond to the B type flow 2B disk. Then, in step (2-6), the initialization command corresponding to the B-type floppy disk is written to the floppy disk control LsI (10) in the same manner as described above, and the startup is completed. According to the above method, the type of floppy disk can be identified without operating the floppy disk, so that processing operations can be speeded up. In addition, in the above embodiment, a case was explained in which a switch was used as the type identification value setting means.

A similar effect can be obtained by using a Japer plug. In addition, in the above embodiment, the floppy disk has two
Since only one type of floppy disk drive was assumed, one type identification value setting means such as one switch was sufficient for one floppy disk drive. However, if several types of floppy disks are assumed, one This can be easily handled by increasing the number of type identification value setting means per floppy disk.

[Effects of the Invention] As described above, according to the present invention, type identification value setting means such as a switch that can be read from the CPU is provided in the type identification circuit of a floppy disk, and by switching the identification value by the setting means. Since the type of floppy disk connected to the computer is identified,
The type can be identified quickly, and as a result, the floppy disk can be controlled quickly and appropriately.

[Brief explanation of drawings]

FIG. 1 is a conceptual configuration diagram of a floppy disk type identification circuit showing an embodiment of the present invention, FIG. 2 is a block diagram of a floppy disk type identification circuit embodying the above conceptual configuration diagram, and FIG. 3 is a block diagram of the floppy disk type identification circuit described above. FIG. 4 is a flowchart for explaining the operation of the identification circuit. FIG. 4 is a flowchart showing a conventional floppy disk initialization method. (1)...CPU, (11), (12), (
13), (14)...Floppy disk drives No. 1, No. 2, No. 3. No. 4, (15)...Type identification value setting means (switches (2), (3), (4), (5)
), (Is)...discrimination means (switch reading control circuit (6)), (17)...control means (clock generation circuit (7), floppy disk control clock switching circuit (8), floppy disk Control LSI
(10)). Agent Masuo Oiwa Figure 3

Claims (1)

[Claims] Type identification value setting means that is set corresponding to the type distinguished from the storage capacity of a plurality of floppy disks connected to the computer, etc., and determination means that determines the identification value set in advance by the type identification value setting means. and a control means for controlling a corresponding floppy disk according to the type of the floppy disk discriminated by the discrimination means.