JPS5636758A - Decision system for floppy disk - Google Patents

Decision system for floppy disk

Info

Publication number
JPS5636758A
JPS5636758A JP11309979A JP11309979A JPS5636758A JP S5636758 A JPS5636758 A JP S5636758A JP 11309979 A JP11309979 A JP 11309979A JP 11309979 A JP11309979 A JP 11309979A JP S5636758 A JPS5636758 A JP S5636758A
Authority
JP
Japan
Prior art keywords
attribute
control area
floppy disk
area
indicated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP11309979A
Other languages
Japanese (ja)
Other versions
JPS63821B2 (en
Inventor
Shugoro Ueno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to JP11309979A priority Critical patent/JPS5636758A/en
Publication of JPS5636758A publication Critical patent/JPS5636758A/en
Publication of JPS63821B2 publication Critical patent/JPS63821B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Management Or Editing Of Information On Record Carriers (AREA)

Abstract

PURPOSE: To decide whether information on an attribute is improper or not by CPU by comparing information on an attribute in the control area of floppy disk unit FPD to that shown in an area where data are written.
CONSTITUTION: When access to floppy disk unit FDP is indicated from the keyboard, processing part MPU detects by the output of flip-flop CF whether a disk has been loaded in unit FDP through interface PIA and, when so, reads the control area on the disk. In the control area, an attribute is stored on the modulation system and the read data is stored in RAM and then judged by MPU. Next, the discriminated attribute is supplied from interface PIA to decoder DE to select indicated modulation-system comparators COPs 1W3, which compare it to the contents of a specific area actually read from unit FPD, thereby deciding whether the data have been written in the specific area by the attribute indicated in the control area.
COPYRIGHT: (C)1981,JPO&Japio
JP11309979A 1979-09-04 1979-09-04 Decision system for floppy disk Granted JPS5636758A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11309979A JPS5636758A (en) 1979-09-04 1979-09-04 Decision system for floppy disk

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11309979A JPS5636758A (en) 1979-09-04 1979-09-04 Decision system for floppy disk

Publications (2)

Publication Number Publication Date
JPS5636758A true JPS5636758A (en) 1981-04-10
JPS63821B2 JPS63821B2 (en) 1988-01-08

Family

ID=14603449

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11309979A Granted JPS5636758A (en) 1979-09-04 1979-09-04 Decision system for floppy disk

Country Status (1)

Country Link
JP (1) JPS5636758A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5974422A (en) * 1982-10-22 1984-04-26 Nippon Steel Corp Protective device for gas processing equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5974422A (en) * 1982-10-22 1984-04-26 Nippon Steel Corp Protective device for gas processing equipment

Also Published As

Publication number Publication date
JPS63821B2 (en) 1988-01-08

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