JPS5617455A - Head positioning system - Google Patents

Head positioning system

Info

Publication number
JPS5617455A
JPS5617455A JP9327979A JP9327979A JPS5617455A JP S5617455 A JPS5617455 A JP S5617455A JP 9327979 A JP9327979 A JP 9327979A JP 9327979 A JP9327979 A JP 9327979A JP S5617455 A JPS5617455 A JP S5617455A
Authority
JP
Japan
Prior art keywords
impl
head
initial position
dpc4
dpu
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
JP9327979A
Other languages
Japanese (ja)
Inventor
Haruki Hayashi
Satoshi Sugiura
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP9327979A priority Critical patent/JPS5617455A/en
Publication of JPS5617455A publication Critical patent/JPS5617455A/en
Pending legal-status Critical Current

Links

Landscapes

  • Moving Of Head For Track Selection And Changing (AREA)

Abstract

PURPOSE: To make it possible to return a head to its initial position automatically in initial microprogram loading (IMPL), by storing whether the head of a magnetic disk unit is at the initial position.
CONSTITUTION: Service processor (SVC)1, once IMPL is carried out through central processor (CPU)2, channel (CH)3 and disk pack controller (DPC)4, sets the cylinder address of DPC4 to zero. Then, DPC4 has a memory area for positioning flag bits of 32 disk pack units (DPU)11W42. Simultaneously with IMPL, corresponding bits are set to "1". Once CPU2 sends an input-output instruction, the above-mentioned bit is referred to prior to the seek command in main memory unit 6 and when it is made sure that the corresponding bit is "1", DPC performs rezero execution and moves the head of corresponding DPU to its initial position to set the above-mentioned bit to zero, thereby performing the following operation.
COPYRIGHT: (C)1981,JPO&Japio
JP9327979A 1979-07-24 1979-07-24 Head positioning system Pending JPS5617455A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9327979A JPS5617455A (en) 1979-07-24 1979-07-24 Head positioning system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9327979A JPS5617455A (en) 1979-07-24 1979-07-24 Head positioning system

Publications (1)

Publication Number Publication Date
JPS5617455A true JPS5617455A (en) 1981-02-19

Family

ID=14077989

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9327979A Pending JPS5617455A (en) 1979-07-24 1979-07-24 Head positioning system

Country Status (1)

Country Link
JP (1) JPS5617455A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62170549A (en) * 1986-01-14 1987-07-27 発絋電機株式会社 Transverse needle selector of jacquard machine
JPH0219534A (en) * 1988-07-01 1990-01-23 Takemura Seisakusho:Kk Selecting and holding apparatus for lifting member

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62170549A (en) * 1986-01-14 1987-07-27 発絋電機株式会社 Transverse needle selector of jacquard machine
JPH0219534A (en) * 1988-07-01 1990-01-23 Takemura Seisakusho:Kk Selecting and holding apparatus for lifting member

Similar Documents

Publication Publication Date Title
JPS57113162A (en) High-speed external storage device
JPS5617455A (en) Head positioning system
JPS54114136A (en) Microprogram loading system
JPS56169281A (en) Data processor
JPS5621215A (en) Loading system
JPS5534316A (en) Store buffer control system
JPS55108027A (en) Processor system
JPS55154623A (en) Input and output control system
JPS563485A (en) Buffer memory device
JPS5487042A (en) Data transfer system
JPS5619132A (en) Device access system
JPS55140953A (en) Abnormal operation detecting system for computer system
JPS53148344A (en) Data storage system to buffer memory unit
JPS5510659A (en) Data processor
JPS5692663A (en) Control device for floppy disc
JPS5616984A (en) Paging processing system
JPS54161859A (en) Program indexing system
JPS54134525A (en) Error recovery control system for storge medium
JPS5585953A (en) Control circuit for memory extension
JPS5532208A (en) Memory control system
JPS57191758A (en) System for storing test program in main storage
JPS5423513A (en) Magnetic disc controller
JPS554678A (en) Log-out system
JPS5549745A (en) Microprogram control system
JPS5462748A (en) Diagnostic system