Early end of tape sensing for a cache buffered tape drive

Details Early end of tape sensing for a cache buffered tape drive Early end of tape sensing for a cache buffered tape drive

1986-09-26

1989-03-07

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 741, 242189, G11B 1548, B65H 5938

Patent

active

048111325

ABSTRACT:
An early end of tape sensing subsystem for a data processing system, including a host computer, a cache buffer, and a magnetic tape drive subsystem utilizes outputs dependent upon the movement of a capstan wheel, swing arm, and file reel of the magnetic tape drive subsystem, determining the net movement of tape therein in order to measure the circumference of the file reel plus tape thereon. Whenever a series of valid readings from a conventional sensor are obtained indicating that the circumference of the file reel plus tape is approaching that of the circumference of the file reel itself (i.e., no tape on the file reel), a signal is sent to the microprocessor controlling the cache buffer, said signal indicating that the end of the tape is approaching.

REFERENCES:
patent: 3648134 (1972-03-01), Audeh et al.
patent: 3666204 (1972-05-01), Gysling
patent: 3697016 (1972-10-01), Leifer et al.
patent: 3984065 (1976-10-01), Bosetti et al.
patent: 4032982 (1977-06-01), Arter et al.
patent: 4243186 (1981-01-01), Peter et al.
patent: 4302784 (1981-11-01), Mussatt
patent: 4366510 (1982-12-01), Watanabe et al.
patent: 4467411 (1984-08-01), Fry et al.
patent: 4507592 (1985-03-01), Anderson
patent: 4550884 (1985-11-01), Permut et al.
patent: 4561608 (1985-12-01), O'Gwynn et al.
patent: 4566652 (1986-01-01), Permut
patent: 4575827 (1986-03-01), Kulakowski
The McGraw-Hill Computer Handbook, New York, McGraw-Hill, Inc. 1983, pp. 7-63 through 7-68.
"American National Standard Recorded Magnetic Tape for Information Interchange (6250 CPI, Group-Coded Recording)", ANSI.RTM. x3.54-1976.

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