JPS55157054A - Disc cash unit - Google Patents

Disc cash unit

Info

Publication number
JPS55157054A
JPS55157054A JP6544479A JP6544479A JPS55157054A JP S55157054 A JPS55157054 A JP S55157054A JP 6544479 A JP6544479 A JP 6544479A JP 6544479 A JP6544479 A JP 6544479A JP S55157054 A JPS55157054 A JP S55157054A
Authority
JP
Japan
Prior art keywords
address
block
sector
disc
cash
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.)
Pending
Application number
JP6544479A
Other languages
Japanese (ja)
Inventor
Takehisa Tokunaga
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 JP6544479A priority Critical patent/JPS55157054A/en
Publication of JPS55157054A publication Critical patent/JPS55157054A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To make easy whether or not the accessed sector is present in the cash, by splitting the block of disc and cash memory into sets and performing mapping in the same set.
CONSTITUTION: The disc record designated with the readout instruction from CPU is stored in the address register 100, and set address is produced from a set address production circuit 200 to select, for example, the set 303 of the directory 300. The comparison circuit 700 compares the entry content of the directory to three levels of the set 303 with the address 110 of a register 100. The level address and the set address in agreement are delivered to a cash memory 500, a block 530 is designated, and a sector in the block 530 is selected with a sector address 104 and delivered to CPU. If not in agreement, a vacant block is retrieved from the set 303. If no vacant block is present, the block having lower frequency of usage is selected.
COPYRIGHT: (C)1980,JPO&Japio
JP6544479A 1979-05-25 1979-05-25 Disc cash unit Pending JPS55157054A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6544479A JPS55157054A (en) 1979-05-25 1979-05-25 Disc cash unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6544479A JPS55157054A (en) 1979-05-25 1979-05-25 Disc cash unit

Publications (1)

Publication Number Publication Date
JPS55157054A true JPS55157054A (en) 1980-12-06

Family

ID=13287304

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6544479A Pending JPS55157054A (en) 1979-05-25 1979-05-25 Disc cash unit

Country Status (1)

Country Link
JP (1) JPS55157054A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5831460A (en) * 1981-08-17 1983-02-24 インタ−ナシヨナル・ビジネス・マシ−ンズ・コ−ポレ−シヨン Addressing unit
JPS58161060A (en) * 1981-11-27 1983-09-24 ストレ−ジ・テクノロジ−・コ−ポレ−シヨン Suitable region dividing method for cash memory
JPS59757A (en) * 1982-06-26 1984-01-05 Fujitsu Ltd Dynamic allocation system of tracking buffer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5040047A (en) * 1973-08-14 1975-04-12

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5040047A (en) * 1973-08-14 1975-04-12

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5831460A (en) * 1981-08-17 1983-02-24 インタ−ナシヨナル・ビジネス・マシ−ンズ・コ−ポレ−シヨン Addressing unit
JPH0247775B2 (en) * 1981-08-17 1990-10-22 Intaanashonaru Bijinesu Mashiinzu Corp
JPS58161060A (en) * 1981-11-27 1983-09-24 ストレ−ジ・テクノロジ−・コ−ポレ−シヨン Suitable region dividing method for cash memory
JPS59757A (en) * 1982-06-26 1984-01-05 Fujitsu Ltd Dynamic allocation system of tracking buffer
JPH0413733B2 (en) * 1982-06-26 1992-03-10 Fujitsu Ltd

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