JPS57153334A - File readout and write-in control system - Google Patents

File readout and write-in control system

Info

Publication number
JPS57153334A
JPS57153334A JP56039194A JP3919481A JPS57153334A JP S57153334 A JPS57153334 A JP S57153334A JP 56039194 A JP56039194 A JP 56039194A JP 3919481 A JP3919481 A JP 3919481A JP S57153334 A JPS57153334 A JP S57153334A
Authority
JP
Japan
Prior art keywords
bit map
file
write
additional memory
readout
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
JP56039194A
Other languages
Japanese (ja)
Other versions
JPH0258653B2 (en
Inventor
Yoshihiro Hibino
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP56039194A priority Critical patent/JPS57153334A/en
Publication of JPS57153334A publication Critical patent/JPS57153334A/en
Publication of JPH0258653B2 publication Critical patent/JPH0258653B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor

Abstract

PURPOSE:To increase the performance of a file access, by retrieving a block to be renewed through the referencing of an additional memory storing a bit map read out in advance in renewing data. CONSTITUTION:A file open instruction is given, a disc control secton 304 checks a table 9, and if the file open instruction is the 1at open instruction entirely, a bit map is read out before the file open processing to be designated, and written in an additional memory 305 through a bit map readout/write-in circuit 308. When the use of a file is finished, the outputted close instruction checks the table 309 and it is a final close instuction, the disc control section 304 writes in the bit map of the final state renewed from the additional memory 305 to the original bit map area of a magnetic disc 303 to the bit map readout/write-in circuit 308.
JP56039194A 1981-03-18 1981-03-18 File readout and write-in control system Granted JPS57153334A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56039194A JPS57153334A (en) 1981-03-18 1981-03-18 File readout and write-in control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56039194A JPS57153334A (en) 1981-03-18 1981-03-18 File readout and write-in control system

Publications (2)

Publication Number Publication Date
JPS57153334A true JPS57153334A (en) 1982-09-21
JPH0258653B2 JPH0258653B2 (en) 1990-12-10

Family

ID=12546303

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56039194A Granted JPS57153334A (en) 1981-03-18 1981-03-18 File readout and write-in control system

Country Status (1)

Country Link
JP (1) JPS57153334A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62154149A (en) * 1985-12-27 1987-07-09 Nec Corp Control system for data area allocation of area shared file
US6185038B1 (en) 1997-09-26 2001-02-06 Matsushita Electric Industrial Co., Ltd. Rear projection screen with light diffusion sheet and projector using same
US7079318B2 (en) 2001-10-05 2006-07-18 Mitsubishi Denki Kabushiki Kaisha Transmission screen and projection display
US7133599B2 (en) 1998-02-25 2006-11-07 Hitachi, Ltd. Realtime data recording method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62154149A (en) * 1985-12-27 1987-07-09 Nec Corp Control system for data area allocation of area shared file
US6185038B1 (en) 1997-09-26 2001-02-06 Matsushita Electric Industrial Co., Ltd. Rear projection screen with light diffusion sheet and projector using same
US7133599B2 (en) 1998-02-25 2006-11-07 Hitachi, Ltd. Realtime data recording method
US7079318B2 (en) 2001-10-05 2006-07-18 Mitsubishi Denki Kabushiki Kaisha Transmission screen and projection display

Also Published As

Publication number Publication date
JPH0258653B2 (en) 1990-12-10

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