Browse Prior Art Database

Direct Processor Motor Control

IP.com Disclosure Number: IPCOM000081038D
Original Publication Date: 1974-Mar-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Ananthakrishnan, RB: AUTHOR [+3]

Abstract

An intelligent terminal incorporates a keyboard, a printer, a magnetic card read/write station, a magnetic card rotary magazine, a stepping motor driving the magazine, a control pulse generator for the stepping motor, an arithmetic and logic unit, a store, a microprogram unit and a channel interface. There is no direct feedback from the magazine to the pulse generator, the precise operation of the stepping motor being defined by the microprogram unit.

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Direct Processor Motor Control

An intelligent terminal incorporates a keyboard, a printer, a magnetic card read/write station, a magnetic card rotary magazine, a stepping motor driving the magazine, a control pulse generator for the stepping motor, an arithmetic and logic unit, a store, a microprogram unit and a channel interface. There is no direct feedback from the magazine to the pulse generator, the precise operation of the stepping motor being defined by the microprogram unit.

The microprogram unit incorporates a microprogram store, an addressing mechanism, a branch controlling mechanism, decoders, input data connections from the arithmetic and logic unit and the channel interface, and output control signal paths to the keyboard, printer, control pulse generator, the arithmetic and logic unit and to itself.

The microprogram store holds, or can be loaded with on demand, motor motion defining vector words. When rotation by a certain amount of the magazine is required in the course of a data processing operation internally or externally, the corresponding motion defining vector word is accessed in the microprogram store, the branch controlling mechanism serving to control the addressing and decoding of the outputs of the microprogram store appropriately. The decoded vector words are fed as control signals to the pulse generator controlling and driving the stepping motor, and hence the movement of the magazine.

For short rotations, a single vector decoded sequen...