JPH05143245A - Floppy disk device control system - Google Patents

Abstract

PURPOSE:To provide the floppy disk device control system which can execute a file access in a short time. CONSTITUTION:In the case a disk is inserted into a floppy disk device 4, all files stored in the disk are stored onto an internal memory 6. In the case a file access request is generated to the disk device 4, a CPU 5 executes the access request by executing read/write to the file stored in the memory 6 or generating the file on the internal memory 6. In the case the access request is a write request or a file generating request, a file updating bit in file control information is set to '1' from '0'. After a prescribed time elapses after '0' becomes '1', or in the case a disk fetching button is pushed, the file is written in the disk.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floppy disk drive control system for reading and writing data stored on a floppy disk.

[0002]

2. Description of the Related Art A conventional floppy disk drive control system will be described with reference to FIG. A host processor 1, a memory 2 and a floppy disk device 10 are connected by a system bus 3. The floppy disk device 10 has an FDD control unit 14.

Conventionally, in this type of floppy disk drive control system, when a file access request such as read, write, or file creation for a file stored in a floppy disk is issued, the floppy disk drive 10 is sent from the host processor 1. FDD control unit 1 for each file access
The target file was read, written, and created via 1.

As described above, in the conventional floppy disk drive control method, the floppy disk is accessed every time an access request such as read, write, and file creation is made to the file, so that the access processing to the file is completed. Spend a lot of time on.

[0005]

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a floppy disk drive control system capable of accessing a file in a short time.

[0006]

According to the floppy disk drive control system of the present invention, when the floppy disk is attached / detached to / from the floppy disk drive, and when the attachment of the floppy disk is detected, all files stored in the floppy disk are detected. The file is read out and stored in the memory, and in response to an access request to the file generated from the host processor, the file in the memory is used to perform the read and write operations, and the file subjected to the write operation is written to the floppy disk. It is characterized by including.

[0007]

The present invention will now be described in more detail with reference to the drawings showing one embodiment of the present invention.

Referring to FIG. 1, in one embodiment of the present invention, a host processor 1, a memory 2 and a floppy disk device 4 are connected by a system bus 3. In the floppy disk device 4, the CPU 5, the internal memory 6, and the FDD control unit 8 are connected by the internal bus 7.
And the disk detection unit 9 is connected.

The disk detection section 9 has a disk detection switch such as a photo sensor or a micro switch, and has a function of detecting attachment / detachment of the floppy disk and notifying the CPU 5 of the detection result. CPU5
Recognizes the removable state of the floppy disk from the disk detector 9, and when the floppy disk is inserted into the floppy disk device 4, reads all files stored in the floppy disk and stores them in the internal memory 6.

FIG. 3 is a memory map showing the state of the file stored in the internal memory 6, and file control information 12 showing the state of the file, file name and BOE (beginning of file), EOB (end of file). , EOE
It indicates that the file maintenance information 13 such as (end of stored data) is added to the file data 14 and stored.

When a file access request such as read, write and file creation from the host processor 1 to the floppy disk device 4 is issued, the CPU
Reference numeral 5 executes an access request by reading / writing a file stored in the internal memory 6 or by creating a file in the internal memory 6. At that time, if the access request is a write request or a file creation request, the file update bit in the file control information 12 is changed from "0" to "1" to clearly indicate that the file has been updated.

The CPU 5 monitors the file control information 12 of all the files at regular intervals, updates the files, and keeps constant after the file update bit of the file control information 12 changes from "0" to "1". The file whose time has passed is written to the floppy disk, and the file update bit in the file control information 12 is changed from "1" to "0".

After that, when the floppy disk take-out button of the floppy disk device 4 is pressed, the CPU 5
Writes all the files having the file update bit "1" in the file control information 12 to the floppy disk, and at the same time erases the information and data of the file stored in the internal memory 6.

[0014]

As described above, according to the present invention,
First, the floppy disk attachment / detachment information from the disk detection unit is notified to the CPU, then the contents of all files stored on the floppy disk are transferred to the memory, and the file on the memory is responded to by the file access request that occurs subsequently. By executing the file access with the data of and writing only the accessed file to the floppy disk, the time required for the file access can be shortened.

[Brief description of drawings]

FIG. 1 is a block diagram of a floppy disk drive control method according to an embodiment of the present invention.

FIG. 2 is a block diagram of a conventional floppy disk drive control system.

FIG. 3 is a diagram showing a memory map of an internal memory in the embodiment shown in FIG.

[Explanation of symbols]

 1 Host Processor 2 Memory 3 System Bus 4, 10 Floppy Disk Unit 5 CPU 6 Internal Memory 7 Internal Bus 8, 11 FDD Control Unit 9 Disk Detection Unit 12 File Control Information 13 File Maintenance Information 14 Data

Claims (3)

[Claims] 1. A host processor which detects the attachment / detachment of a floppy disk to / from a floppy disk device and, when the floppy disk installation is detected, reads all files stored in the floppy disk and stores them in a memory. In response to an access request to a file generated from, a read / write operation is executed using the file in the memory, and the write operation is performed to the floppy disk device control system. 2. The floppy disk drive control system according to claim 1, wherein writing from the file to the floppy disk is performed at a time point when a predetermined time has elapsed after a write operation was performed. 3. The writing to the floppy disk from the file is performed when a floppy disk eject button is pressed.
Floppy disk device control method described.