JPS63148472A - Floppy disk control device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a floppy disk control device that is capable of writing information to and reading information from floppy disks of different recording formats. For example, it relates to the conversion of information created by a processing device and recorded on a floppy disk, and is intended to achieve compatibility between information in different recording formats.

[Conventional technology]

As a conventional floppy disk control device, there is one described, for example, in Japanese Patent Application Laid-Open No. 181823/1983.

This conventional example includes a document processing device configured to convert document information recorded in a first recording format into a second recording format, and a converting means for converting the first recording format into keystroke string information. , human power means for selecting either the keystroke string information or the input information sent from the keyboard means, a control means connected to the input means, and a prohibition means for prohibiting display processing in the control means. It is designed to provide compatibility between document information in different recording formats.

However, although this document processing device can be applied when the recording formats of documents are different, it cannot be applied when the recording formats for sectors, tracks, and cylinders of a floppy disk are different.

In this way, in order to obtain compatibility of information created between processing devices using floppy disk controllers with different recording formats, it has conventionally been necessary to create software that converts sector addresses that are accessed from scratch. , it took a certain amount of time to develop the software.

For example, as shown in FIGS. 4(a) to (C1), it is assumed that there are floppy disks recorded by processing devices using different recording formats.

That is, in the recording format (A) of FIG. 4(a), track 0 is used and accessed by updating in the order of sector→cylinder→track. In addition, the recording format shown in Figure 4(b) (
In B), the 0 track is not used, access is started from the 1st track, and the sector address update order is the same as in (A). Furthermore, the recording format (C) in Figure 4 (C) is
Access starts from track 0, but the sector address is updated in the order of sector → track → cylinder.

Floppy disks with information recorded in these different recording formats (A) to (C) are obviously not compatible (,
To make these compatible, it is necessary to create conversion software or driver routines.

The conversion routine process converts the sector number to S.

Assuming that the track number is T and the cylinder number is C1, the total number of sectors from the start address to the designated sector address is N, the following processing is performed.

(11 When converting the recording format (B) to the recording format (A), the following conversion processing is performed using equations +11 to (3).

T=T+,)-1・・・・・・・・・・・・(1)C=
C (ml ・・・・・・・・・・・・(2)
SmS,.・・・・・・・・・・・・(
3) When converting the recording format (C) (2) to the recording format (A), the following conversion processing is performed using equations (4) to (7).

N = C(C1' T+sax ' 5sax+ T
(C1' Smaw+ S (C)・・・・・・・・・
...(4) T=(N-1)/CI%, -S,,X ...
・・・・・・・・・(5)C=t(N-1)-T-C
,,X,S□. )/S, □・・・・・・・・・・・・(
6) SmN-T -C,, -S,, -C-S,,.

・・・・・・・・・・・・(7) In each of the above formulas, the subscripts (B) and (C) are the same as in the recording formats (B) and (C), respectively. , and the subscript ``wax'' indicates the maximum possible number of each value, and the remainder of the division in the formula is truncated.

[Problem that the invention seeks to solve]

However, in the conventional floppy disk control device described above, in order to obtain compatibility between floppy disks with different recording formats, it is necessary to perform address conversion processing by software, and the conversion of sector addresses is performed every time a sector is accessed. There is a problem in that the processing has to be performed, which increases the load on the processing device and reduces the processing speed.

Therefore, the present invention provides information compatibility with information recorded in different recording formats in sectors, tracks, and cylinders of a floppy disk, without adding or changing software, and while reducing the load on the processing device. The object of the present invention is to provide a floppy disk control device that can maintain performance.

[Means for solving problems]

In order to achieve the above object, the present invention stores a floppy disk file recorded in a first recording format in the first recording format.
In a floppy disk control device that converts and accesses a second recording format different from the recording format of
displacement amount setting means for setting the displacement amount of a sector; update order setting means for setting the update order of the cylinder, track, and sector according to the recording format of the floppy disk; a first sector address conversion section that converts a sector address based on the setting value of the displacement amount setting means and the contents of the sector address register when the displacement amount setting means is set; is set, a second sector address conversion section calculates the number of sectors, the number of cylinders, and the number of tracks according to the update order and converts the sector address.

[Effect]

In this invention, the sector address specified by the processing device and the sector address of a different floppy disk match the update order of the sector, track, and cylinder, and the first recording position of any one of the sectors, tracks, and cylinders is the same. If they are different, the displacement amount of the sector, track, or cylinder is set by the displacement amount setting means, and the first sector address converter converts the sector based on the set value and the sector address specified by the processing device. By converting addresses according to the amount of displacement, floppy disks with different amounts of displacement can be accessed. Furthermore, if the sector address specified by the processing device and the sector address of the floppy disk differ in the update order of the sector, track, or cylinder, the update order can be set by the update order setting means to update the second sector. The address converter calculates the number of sectors, tracks, and cylinders according to the set update order, and outputs the result of the calculation as a sector address to the floppy disk controller to access floppy disks with different update orders. I can do it.

〔Example〕

Hereinafter, the present invention will be described in detail based on the drawings.

FIG. 1 is a block diagram showing an overview of the invention.

In the figure, 1 is a processing unit such as a central processing unit, and 2 is a floppy disk control unit 4 that drives a floppy disk 3.
5 is a memory, and these are connected via a bus 6. Here, when the specified sector address is written by the processing device 1, the floppy disk control device 2 transfers the sector address to the floppy disk control section 4, and writes the specified sector address according to the sector address assignment assumed by the operating system. It is configured to access sectors, and therefore an interrupt indicating the end of access is transferred to the processing device 1 side each time one sector is accessed using the starting sector address of the file and the number of sectors specified by the processing device 1. The floppy disk 3 is configured so that a plurality of physically consecutive sectors can be accessed at once.

A sector address conversion processing section 7 for preprocessing sector addresses is provided upstream of the floppy disk control section 4 in the floppy disk control device 2.

As shown in FIG. 2, this sector address conversion processing section 7 includes a sector address register 8 connected to a bus 6, and a sector address conversion register 9 constituting displacement amount setting means.
and a sector address update order register 10 constituting an update order setting means, the contents of the sector address register 8 and the sector address conversion register 9 are added by a sector address adder 11 as a first sector address conversion section, The addition result and the contents of the sector address update order register are supplied to a sector address converter 12 as a second sector address converter.

A sector address is written into the sector address register 8 from the processing device 1 in accordance with the allocation assumed by the operating system.

The sector address conversion register 9 specifies the amount of displacement when the leading value of the sector address differs between floppy disks 3 of different recording formats, and is input from an input means such as a keyboard when the floppy disk 3 is installed. The displacement amount is written.

The sector address update order register is cylinder.

It determines the update order of tracks and sectors, and when the floppy disk 3 is loaded, setting values are written in accordance with the update order inputted from input means such as a keyboard.

As shown in FIG. 3, the sector address converter 12 is supplied with the addition result of the sector address adder 11, and includes a total sector number calculation unit 13 that calculates the total number of sectors based on the addition result, and a total sector number calculation unit 13 that calculates the total number of sectors based on the addition result. and the contents of the sector address update order register 10 are inputted to an update order control unit 14.
, a sector number calculation unit 15 , a track number calculation unit 16 , and a cylinder number calculation unit 17 controlled by the update order control unit 14 .

The update order control unit 14 updates the sector → cylinder → track when the content of the sector address update order register 10 is “0′°, and updates the sector → cylinder → track when the content is 1°”.
Each calculation unit 15~ so that the track → cylinder is updated.
17.

Next, the operation of the above embodiment will be explained. Now, the processing device 1 has set the floppy disk control device 2 to the recording format (A).
It is assumed that the Fronbi disk 3 is accessed and information stored in the memory 5 is written thereto, or recorded information is read and stored in the memory 5.

In this state, the floppy disk 3 recorded in the recording format (A) is inserted into the floppy disk control unit 4 of the floppy disk control device, and the floppy disk 3 is
To access from the processing device I, first, the displacement amount C+ =0. Tr
=0. St = 0 is input via the bus 6 by an input means such as a keyboard, or is written via the bus 6 at the time of initialization, and the sector address update order register 10
Similarly, "'0" is written via input means such as a keyboard or via the bus 6 during initial setting.

By doing this, by specifying a sector address for the floppy disk 3 in the processing device l, this is sent to the floppy disk control device 2 via the bus 6.
is written to the sector address register 8 of.

At this time, the sector address register 8 is filled with a cylinder number C, =0. Assuming that track number TN = 1 and sector number 5N = 1 are stored, these and the setting values C+ = O, T + = 0 and Sl = o stored in sector address conversion register 9 are added to the sector address adder. 11, but the addition result is CNA=0. TNA=1 and 5N
A=1, and there is no difference from the sector address stored in the sector address register 8, and this addition result is input to the sector address converter 12.

In this sector address converter 12, a total sector number calculation unit 13 calculates the total number of sectors from the first sector address to the designated sector address. At this time, assuming that the number of sectors in one track of the floppy disk 3 is 26, the total number of sectors N of cylinder number CH-〇, track number TN = 1, and sector number 5N = 1 is 53, and this is the update order control. 14. Since the setting value "0" of the sector address update order register 10 is input to the update order control section 14, the update order is selected as sector→cylinder→track, and based on this, the sector number calculation section 15, Since the cylinder calculation unit 17 and the track number calculation unit 16 are controlled, the calculation results of these calculation units 15 to 17 are 5NC=1°TNC=1.CNC=0,
It matches the cylinder number, track number and sector number stored in the sector address register 8, and the recording format (
The floppy disk 3 in A) can be accessed.

On the other hand, when a floppy disk 3 of recording format (B) is installed in the floppy disk controller 4 and accessed by the processing device 1, the cylinder number c,=O, ) Set rack number T r = 1, sector number 51 = 0,
The sector address update order register 10 is set to '0' in the same manner as above.By doing this,
For example, a cylinder number CN=0.0 that represents the first sector address is input from the processing device 1 to the sector address register 8. Assuming that track number TN = 0 and sector number S, = 1 are written, the addition results of sector address adder 11 are CHA = 0, TN = 1. SS^=1, and the output of the sector address converter 12 is CNC=O
, TMc=1, S) lc=1, and the first sector "1" in the track "1°" of the cylinder "0"
This address is input to the floppy disk control unit 4, and the floppy disk 3 of recording format (B) can be directly accessed.

Further, when a floppy disk 3 of recording format <B) is installed in the floppy disk control section 4 and accessed by the processing device 1, the cylinder number C+ =0. ) Rank number T, = 0. The sector number 5t-0 is set, and the sector address update order register 10 is set to "1". In this way, the processing device 1 writes the cylinder number CN=1 to the sector address register 8, for example. Assuming that l-rack number 'r, 4 = and sector number S, = 1 are written, the addition result of the sector address adder 11 is the set value C + of the sector address conversion register 9.
, T+, and St are all "0", so CNA=1.
TNA=1. S, , A=1, which is input to the sector address converter 12.

In this sector address converter 12, first, the adder 11
Based on the addition result, the total number of sectors calculation unit 13 calculates the total number of sectors N from the first sector address to the designated sector address. At this time, the addition result is CNA=1, TN
Since A=1, 3NA'''1, the total number of sectors is N=79, which is input to the update order control section 14.

Since the update order of "'l" is inputted to the update order control unit 14 from the sector address update order register 10, the update order of sector addresses is changed from sector to track to
The sector number calculation section 17, the track number calculation section 16, and the cylinder number calculation section 15 are controlled so that the cylinder number c, 1 . =O,
Track number T sc = 3 and sector numbers S, C
A calculation result of =1 is obtained, which corresponds to the sector address of the floppy disk 3 of recording format (C), and is input to the floppy disk controller 4.

Therefore, the floppy disk 3 of recording format (C) can be accessed accurately by the processing device 1.

In addition, when accessing a floppy disk 3 of a format with a different displacement amount and update order, set the displacement amount in the sector address conversion register 9 and set "°1" in the sector address update order register. ,
A floppy disk 3 in any recording format can be directly accessed from the processing device l.

In this way, according to the above embodiment, the sector address conversion circuit 7 sequentially converts the sector addresses, so by specifying the first sector address of the file and the number of sectors to be accessed from the processing device 1ffil, the sector address conversion circuit 7 converts the sector addresses. , in order to convert the sector address of each sector in the file sequentially, the processing device 1 only needs to set the setting values in the sector address conversion register 9 and the sector address update order register 10 according to the recording format of the floppy disk 3. The file that you want to access can be accessed as a continuous physical sector without receiving an interrupt for the end of access for each sector.

Note that in the above embodiment, the sector address adder 1
1 and the sector address converter 12 are connected in series, but if the recording format of the floppy disk 3 to be compatible is fixed as shown in FIG. An adder 11 and a sector address converter 12 are connected in parallel, and their outputs are selected depending on which of the sector address conversion register 9 and the sector address update order register 10 the set value is written to, and the output is transferred to a floppy disk. It may also be input to the control unit 4.

Furthermore, in the above embodiment, a case has been described in which a register is used as a displacement amount setting means and an update order setting means, but the invention is not limited to this, and an external displacement amount setting device and an update order setting device are provided. You can do it like this.

Further, in the above embodiment, the case where the number of cylinders is 2, the number of tracks is 76, and the number of sectors is 26 has been described, but the invention is not limited to this, and any number of cylinders, tracks, and sectors can be used. This invention can also be applied to floppy disks.

〔Effect of the invention〕

As explained above, according to the present invention, even if the floppy disk has a different displacement amount or update order without changing the software,
It is possible to make the information recorded on both sides compatible, and it is not necessary to convert the sector address of each sector of the file once, as in the case of achieving compatibility with conventional software. Since sector address conversion is done by hardware, the processing device only needs to send the first sector address of the file and the number of sectors to be accessed to the floppy disk control device, so the load on the processing device does not increase. Effects such as being able to easily provide compatibility of information recorded on floppy disks while improving the efficiency of the processing device can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an overview of this invention, FIG. 2 is a block diagram showing an example of a sector address conversion circuit that can be applied to this invention, and FIG. 3 is an example of a sector address conversion circuit that can be applied to this invention. Block diagram showing Fig. 4 Ta) ~
(C1 is an explanatory diagram showing recording formats of floppy disks recorded in different recording formats. In the figure, 1 is a processing device, 2 is a floppy disk control device, 3 is a floppy disk, 4 is a floppy disk control unit, 5 is a memory, 6 is a bus, 7 is a sector address conversion processing unit, 8 is a sector address register, 9 is a sector address conversion register, 10 is a sector address update order register, 11 is a sector address adder (first sector address conversion ), 12 is a sector address converter (second sector address converter), 13 is a total sector number calculation unit, 14
15 is an update order control section, 15 is a cylinder number calculation section, 16 is a track number calculation section, and 17 is a sector number calculation section. Figure 1 Figure 3 Figure 4

Claims (3)

[Claims] (1) In a floppy disk control device that converts a floppy disk file recorded in a first recording format into a second recording format different from the first recording format and accesses the file, a sector address is specified by the processing device. a sector address register for setting the displacement amount of the cylinder, track, and sector in the floppy disk; and an update order for setting the update order of the cylinder, track, and sector according to the recording format of the floppy disk. a first sector address for converting a sector address based on a set value of the displacement amount setting means and the contents of the sector address register when at least the displacement amount setting means sets a displacement amount other than zero; When a predetermined update order is set in the conversion unit and at least the update order setting means, the number of sectors is determined according to the update order.
A floppy disk control device comprising: a second sector address conversion section that calculates the number of cylinders and the number of tracks and converts a sector address. (2) The floppy disk control device according to claim 1, wherein the first sector address converter is comprised of a sector address adder. (3) The second sector address conversion section receives the total sector number calculation section, its total number of sectors, and the setting values of the update order setting means, and calculates the number of sectors, the number of tracks, and the number of cylinders according to the update order setting values. The floppy disk control device according to claim 1 or 2, further comprising an update order control section that controls a calculation section that performs calculations.