JPS62139183A - Generation method for control program corresponding to various kinds of floppy disk format - Google Patents

Abstract

PURPOSE:To generate a floppy disk control program by providing a sub program group, providing a table having a prescribed form on which the information item of a disk format is set, and inputting the data of a format table to the sub program group. CONSTITUTION:The disk control program which performs the formatting of a floppy disk and an operation for the read/write of multiple sectors is generated using plural prescribed sub programs (format information administration program) which perform processing regarding a format to hide the difference between information items, and a prescribed table (format table) on which a bit of information required for the processing in the format is set in advance. Thus, since the format administration program and the format table are set such the said method, the disk control program in which no change of the disk control program that becomes a base for the difference between the disk formats is required, and the disk control program which is possible to be operated corresponding to the disk format to which a table data is inputted by only generating the format table can be easily generated.

Description

[Detailed description of the invention] [Technical field to which the invention pertains]

The present invention relates to a method for formatting a floppy disk (preparing an ID number as sector boundary data on the disk to create a sector frame) and creating software (hereinafter referred to as a floppy disk control program) for reading and writing on the disk.

[Prior art and its problems]

This type of floppy disk control program generally uses a method in which a specific control program is created for several specific types of disk formats that have been decided to be adopted. However, since this method does not use a unified method for processing information items that indicate differences in disk formats, once a control program has been created for that particular disk format, it is easy to add or change the format that you want to support. However, it is difficult to create a control program that can handle many types of disc formats at once.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks, and in order to adapt to the recent spread of various types of discs, it is easy to add and change compatible disc formats and to support multiple types of disc formats at once. Moreover, by using a method that creates and adds compatible disk formats simply by creating a format table without changing the disk control program, it is not only easy to handle, but also
The purpose of this invention is to provide a method for creating a floppy disk control program that is easy to create and has high reliability.

[Key points of the invention]

The main point of this invention is that when creating a control program for a floppy disk, a group of subprograms (i.e., a format information management program ), and by creating the control program using this subprogram group, the control program is made invariant to the disk format, and furthermore, information items of the disk format necessary for processing the format information management program are set. A table (that is, a format table) in a predetermined format is provided, and the data of the format table is inputted into the subprogram group in which the information items indicating the difference in disk format are hidden to form a final operable subprogram group. In this way, the number of compatible disk formats can be increased simply by exchanging the format table.

[Embodiments of the invention]

The present invention will be described in detail below based on FIGS. 1 to 4. In each figure, the same reference numerals indicate the same or corresponding parts. The format information management program consists of the following subprograms a to 1. Hereinafter, the cylinder number will be expressed as C, the head number as HD, the sector number as S, the number of sectors as CNTS, and the data length (number of bytes) as DTL. Straddle 〉
The numbers in the box indicate the information items hidden by each program, which will be explained later. Subprogram a (sector check): Specified C
, HD, S, and CNTS are correct in the target disc format. Subprogram b: Program that calculates the new C, HD when 1 is added to HD from the given C, HD.
・・・・・・−・ く〉. Subprogram C: given C, HD, S to S
A program to find new C, HD, and S when CNTS is added to --- <■, ■, ■>. Subprogram d: From the given C, HD, S,
A program that calculates the CNTS up to the last sector of the cylinder including that sector.■
, ■, ■〉. Subprogram e: A program that calculates the CNTS from the given C, HD, S to the last sector of the track including that sector.
, ■〉. Subprogram f: Program that calculates CNTS for DTL from given C, HD, and DTL.
−・ く■、■〉. Subprogram g: given C, HD, CNTS
Program to find DTL for CN73 from
−−−−<■, ■). Subprogram h: A program that determines the maximum cylinder number from the number of cylinders in the format table. A program that creates an ID pattern (table of ID numbers) for subprogram mini formatting.
−・−ku■,■,■,■〉. Here, the information items indicated by Φ~■ in parentheses above are:
means the following: ■Differences in handling: two on one side and one on both sides. ■: Difference in recording density: double-density single writing. ■: 128 bytes, 256 heights, 512 hides, 10
Number of bytes per sector (-sector length) of 24 bytes
. ■: Number of sectors per track. ■Nijirinda number. ■: Are the recording density and sector length the same for all tracks? Or the difference in disk format, such as IBM's disk format. The subprograms a-i hide the information items ① to ② except ②. Item (2) shall be used during formatting and reading/writing operations. Here, for convenience of explanation, the basic operation program (also simply referred to as operation) in the floppy disc control program as shown below is temporarily set as follows. Operation P (recalibration plate): A program to move the head to the O cylinder. Operation q (seek): A program that moves the head to a specified cylinder. Operation r (Write ID'):) A program that performs formatting using an ID pattern for formatting within a rank. Operation s (1 sector read): A program that reads data from a specified sector (C. HD, S) to a specified memory area using a specified number of data DTL as the sector length. Operation 31 (multi-sector read): Specified sector (C, HD
, S), the program reads a specified number of data DTL to a specified memory area. Operation t (1 sector write): A program that writes data in a specified memory area to a specified sector (C. HD, S) with the specified number of data DTL as the sector length. Operation tl (multi-sector write): Specified sector (C, HD
, S) is a program that writes a specified number of data DTL from a specified memory area. The PAD diagram of the disk formatting program when these subprograms a-yi and the operation program p-tl are used is shown in Figure 1, and the PAD diagram of multi-sector reading and writing is shown in Figure 2 (11, +21). . If sl and tl are used instead of s and t, Figure 2 (
2) becomes as shown in Figure 2 (3). Further, when data is transmitted and received multiple times using a finite-length buffer in multi-sector reading and writing, the situation is as shown in FIG. 3. With these, it can be seen that the information on the disk format is hidden except for the maximum cylinder number, which is a value unique to the disk format in formatting, and the operation is unchanged with respect to the difference. Next, FIG. 4 shows the format of a table (format table) of information required by the format information management program of the subprogram a w i for its processing. Each information item means the following data, and these data are respectively written into the corresponding memory areas. IBMFNT (IBM disk format flag)
: Storage density and sector length are the same for all tracks or IBM
Data indicating whether the disc format is compliant. 5DTYPE: Data indicating single-sided/double-sided. Number of cylinders per CPD drive. Data indicating whether DNS is double-dense or double-dense. Number of sectors per SPT Nidrank. LCODE (sector length code): 12B bytes/
0.256 bytes per sector / 1,512 bytes per sector / 2.1024 bytes per sector / 3°BPS
(Number of bytes per sector length): 128/2561512
/1024°GPL: Sector data field and next sector ID
Number of bytes written in the gap between fields (referred to as GAP3). GSI: Number of bytes skipped in GAP3. C0HOXXX Nijilinda O, XXX in head O
(However, XXX is DNS, SPT, LCODE, BPS
, GPL, or GSL. ) COHIXXX Niji Linda 0. XXX in head 1
<However, XXX is DNS, SPT, LCODE, BPS
, GPL, or GSL. ) However, COHOXXX is valid when it conforms to the IBM disk format, and C0HIXXX is valid when it conforms to the IBM disk format and is double-sided. This table is referenced via a variable that refers to memory relative to the address value (base) set as the first memory location of the table. Therefore, by creating format tables for several types of disk formats according to the format of this format table, and calling the format table by specifying the start address (base) of the table, the disk control program corresponding to the disk format in question can be created. It becomes possible to create.

【Effect of the invention】

According to this invention, since a format management program and a format table are set, the underlying disk control program remains unchanged due to differences in disk formats, and table data can be input only by creating a format table. An operable disk control program compatible with the current disk format can be created easily, and highly reliable disk control compatible with a wide variety of disk formats can be achieved.

[Brief explanation of drawings]

FIG. 1 is a PAD diagram showing the procedure of a disk formatting program as an embodiment of the present invention, and FIG.
) to (3) and FIG. 3 are PA diagrams each showing the procedure of a multi-sector read/write program as different embodiments of the present invention.
Figures D and 4 show the format of a format table as an embodiment of the present invention. Only praise

Claims (1)

[Claims] Differences in handling surfaces (single-sided and double-sided), differences in recording density (single-density and double-density), and byte lengths per sector (128 bytes, 256 bytes, 512 bytes, and 1024 bytes)
Differences in disk formats, such as sector length), number of sectors per track, number of cylinders, recording density and sector length, are all tracks the same or partially different?
A disk control program that performs floppy disk formatting and multi-sector read/write operations based on a format determined from an arbitrary combination of information items such as Multiple predetermined subprograms (
This subprogram group is hereinafter referred to as a format information management program) and a predetermined table (hereinafter referred to as a format table) in which information necessary for processing in that format is set in advance. A method for creating control programs compatible with various floppy disk formats.