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Browse Prior Art Database

Machine Position Control Program Interruption Apparatus

IP.com Disclosure Number: IPCOM000086841D
Original Publication Date: 1976-Nov-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Current, HG: AUTHOR [+3]

Abstract

A programmable machine controller for controlling a magnetic tape drive, having a rotating head motor M and a pair of reel-to-reel motors MR (machine reel) and DCR (data cartridge reel), is achieved by controlling the program execution of the microcomputer by a tachometer counter.

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Machine Position Control Program Interruption Apparatus

A programmable machine controller for controlling a magnetic tape drive, having a rotating head motor M and a pair of reel-to-reel motors MR (machine reel) and DCR (data cartridge reel), is achieved by controlling the program execution of the microcomputer by a tachometer counter.

In a real-time microcoded computer, the programmed computer or controller looks for new commands to execute from a controlling unit (not shown), controls search operations of the magnetic tape drive, updates the control circuits for motor M and the reel motors MR and DCR, so that the magnetic tape unit executes its functions in a proper and timely manner. Such functions include the maintenance of tape speed, tape tension and tape position in a so-called stop- lock mode.

The rotation of motor M and its tachometer T is divided into four quadrants. Each quadrant has assigned portions for program execution. The interrupt control from the tachometer counter indicates to the microcomputer which programs to execute. In rotational period portions A, the motor control signals for M, MR and DCR are updated. In times B, the computer looks for new commands from a controlling unit (not shown), performs logic functions for record searching and performs other supervisory tape control functions not directly related to the servo control functions related to the three motors.

In the intervening times, diagnostics may be performed.

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