JPH03225674A - Floppy disk control system - Google Patents

Abstract

PURPOSE:To cancel the non-operation of a program by providing plural input/ output ports, preventing the set value of a transfer rate from being changed on one hand, and changing a rotating speed according to set contents on the other hand. CONSTITUTION:The transfer rate value is set in the first input/output port and recording density is set in the second input/output port. When a power source is turned on, the program stored in a ROM 2 is activated and the initial diagnosis of a system is executed under the control of a CPU 1. Then, DMA controllers 4 and 5 to control direct memory access, interruption controllers 6 and 7 to control interruption, and timer 8 are initially set. The transfer rate value set in the first input/output port is fixed and the recording density set in the second input/output port is changed while varying the rotating speed according to the applied contents. Thus, the compatibility of a software can be maintained and the non-operation of the program is canceled.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a floppy disk control method suitable for use in personal computers, and particularly relates to a floppy disk control method suitable for use in personal computers, and in particular, it relates to a floppy disk control method suitable for use in personal computers, and in particular, it relates to a floppy disk control method suitable for use in personal computers. The present invention relates to a floppy disk control method suitable for use in a floppy disk device capable of reading/writing media.

(Prior Art) A floppy disk is normally used as an external storage medium for personal computers. Distribution software for this type of computer is usually recorded and sold on a medium called a 5-inch (or 3.5-inch) floppy disk. Currently, 2HD (high density) floppies are becoming mainstream. In Japan, 1.2MB is the mainstream for this 2HD floppy disk, and 1.44MB is the mainstream overseas. This 2H
The transfer rate of both D floppies is the same, 500KB.
PS, however, the rotational speed of the floppy disk drive (FDD) is 36 Orpm for 1.2MB, 1.
44MB is 30Orpm and they are different from each other.

By the way, there is a floppy disk drive that supports both 1.2MB floppy and 1.44MB floppy, and if you use 1.44MB floppy,
This is handled by changing the rotation speed from 360 rpm to 300 rpm. Normally, when a floppy disk is inserted into a floppy disk drive, the computer determines the type of floppy disk by changing the transfer rate and checking whether it can be read.

(Problem to be Solved by the Invention) As mentioned above, since the transfer rate of 1.44MB floppy and 1.2MB floppy is the same, set 1.44MB and 1.2MB to a certain input/output port, and It can be controlled according to the following. However, in the field of personal computers, input/output port values are published and programmers develop distributed software according to these specifications, so changing these values can cause compatibility problems such as application programs not working. Sometimes.

This invention was made in view of the above circumstances, and includes: 1.
A floppy disk device that can read and write both 44MB floppy and 1.2MB floppy, without changing the transfer rate set to the input/output port.
．． The object of the present invention is to provide a floppy disk control method that enables reading and writing of 44 MB and 1.2 MB floppies and eliminates the influence on software.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a personal computer equipped with a disk drive capable of reading and writing recording media having the same transfer rate and different recording densities. The first input/output port has a first input/output port to which a rate value is set, and a second input/output port to which a difference in recording density is set. The feature is that data can be read/written without changing the value set in .

(Function) The present invention is a personal computer having a floppy disk drive as external storage that can read and write both a 2HD floppy disk with a recording density of 1.44 MB and a floppy disk with a recording density of 1.2 MB. , when a 2HD 1.44 MB floppy and a 2HD 1.2 MB floppy have specifications having the same transfer rate, read and write from and to both floppies without changing the transfer rate designation. Therefore, in addition to the input/output port where the transfer rate value is set, there is also an input/output port that changes the rotation speed of the floppy disk. 2HD1.44MB floppy and 2HD1.2M by changing the input/output port by changing the rotation speed
B floppies are supported.

This maintains application compatibility.

(Example) Embodiments of the present invention will be described below using the drawings.

FIG. 1 is a block diagram showing an example of the configuration of a personal computer to which the present invention is applied. In the figure, reference numeral 1 is a CPU that serves as the control center of the system. Code 2 is RO
M, which is a memory in which programs that control the system are stored. Reference numeral 3 is a RAM, which is a memory in which an operating system (O8), application programs, etc. are stored. Codes 4 and 5 are DMA
It is a controller (DMAC) and is an LSI that controls direct memory access. Reference numerals 6 and 7 indicate interrupt controllers (PICs), which are LSIs that control interrupts.

The code 8 is a programmable interval timer (PIT
) and is a timer LSI. Reference numeral 9 is a real-time clock (RTC), which controls the date, time, etc.
It is SI. Reference numeral 1o denotes a hard disk controller (IDC) that controls a hard disk drive (HDD) 1g under the control of the CPUI. Reference numeral 11 indicates a floppy disk drive (FDD) 19 under the control of the CPUI.
This is a floppy disk controller (FDC) that controls read/write operations. Reference numeral 12 denotes a printer controller (which controls the printer under the control of the CPUI).
PRTC). Reference numeral 13 is a serial input/output interface (510), which is a circuit that controls R5232C. Code 14 is a keyboard controller (KBC
) and is a circuit that controls the keyboard 20. code 1
A display controller (CRTC) 5 controls the display drive of the plasma display 21. code 1
A video RAM (VRAM) 6 is a display memory in which characters and the like to be displayed on the plasma display 21 are stored. Reference numeral 17 is a memory (ROM) in which Kanji fonts are stored. Reference numeral 18 is a hard disk drive (HDD), which is an external storage device in which application programs, data, and the like are stored. Reference numeral 19 is a floppy disk drive (FDD), which is an external storage device in which application programs, data, etc. are stored. Reference numeral 20 is a keyboard, and reference numeral 21 is a plasma display, which is a panel type display device.

FIG. 2 is a flowchart showing the operation in the embodiment of the present invention.

Hereinafter, the operation according to the embodiment of the present invention will be explained with reference to FIG. First, when the power is turned on, ROM2
A program stored in the CPU is started, and initial diagnosis of the system, initial setting of each LSI, etc. are performed under the control of the CPU. When this initialization process is completed, a process is performed to set the 2HD media to 1.2MB (step S2 in FIG. 2). This process outputs a signal to a specific input/output port to rotate the floppy disk device at 36 rpm.
Set to .

After this, when a floppy disk is inserted into the floppy disk device, the transfer rate is set to 300K to check whether the floppy disk is a 2DD media.
BPS is set (step S2 in FIG. 2), and the floppy disk is read (step S3 in FIG. 2).

If no error occurs during this read, it is determined that the floppy disk is a 2DD medium (steps S4 and S5 in FIG. 2).

Also, if an error occurs in the above read, the transfer rate will be reduced to 50.
0KBPS is set and the floppy disk is read (steps S6 and S7 in FIG. 2).

If no error occurs during this read, it is determined that the floppy disk is a 2HD 1.2MB medium (steps S8 and S9 in FIG. 2).

Also, if an error occurs here, it is determined whether the 2HD media setting is 1.44MB or not, and if the 2HD media setting is 1.44MB, a signal of a specific input/output port is output and the data is transferred again. Read the floppy disk at a rate of 500KBPS (Figure 2 Step SIO
, S6. ...). Also, if the check is performed with the setting of 2HD media 1.44MB, this media is determined to be unsupportable (step 512 in Figure 2).
.

In this way, 1.44MB floppy and 1.2MB floppy disks can be transferred without changing the transfer rate set to the input/output port.
It is possible to read and write MB floppies, thereby maintaining application compatibility.

[Effects of the Invention] As described above, according to the present invention, an input/output boat for which the rotation speed is set is added in addition to the input/output boat for specifying the transfer rate, and the input/output port for which the transfer rate is set is By changing the rotation speed according to the contents of the added rotation speed setting input/output board without changing the meaning, software compatibility can be maintained and the problem of application programs not working can be solved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a configuration example of a personal computer to which the present invention is applied, and FIG. 2 is a flowchart showing a processing flow in an embodiment of the present invention. 1... CPU, 2... ROM, 11... Floppy disk controller (FDC), 19... Floppy disk drive (FDD).

Claims (1)

[Claims] In a personal computer equipped with a disk drive that can read/write recording media with the same transfer rate but different recording densities, there is a first input/output port where the transfer rate value is set, and the recording density is set. second to be done
A floppy disk characterized in that the data is read/written by drive control according to the settings of the second input/output port without changing the settings of the first input/output port. control method.