Browse Prior Art Database

ROM AND CONTROL COUNTER IN FLOPPY DISK DRIVE COONTROLLER

IP.com Disclosure Number: IPCOM000023518D
Original Publication Date: 1977-Dec-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 217K

Publishing Venue

Xerox Disclosure Journal

Abstract

A floppy disk drive controller has a ROM for generating the steps to be carried out for each operation to be performed. Certain steps are repeated a plurality of times, Sometime prior to a repeat sequence, a counter in the controller is loaded with a number from ROM that indicates the desired number of repeats. During the step being repeated, the same ROM outputs used previously to load the counter are compared against the counter contents in order to determine the end of the number of repeats. The process cab be repeated without reloading if the number in the counter is correct for the new sequence.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

ROM AND CONTROL COUNTER IN Proposed Classification
FLOPPY DISK DRIVE CONTROLLER U.S. Cl. 340/174R
Robert Swenson mt. Cl. Glic 11/02

DESK FLOPPY

    DRWE D~SK CONTROLLER DRIVE

A floppy disk drive controller has a ROM for generating the steps to be carried out for each operation to be performed.
Certain steps are repeated a plurality of times, Sometime
prior to a repeat sequence, a counter in the controller is
loaded with a number from ROM that indicates the desired
number of repeats. During the step being repeated, the same
ROM outputs used previously to load the counter are compared
against the counter contents in order to determine the end of
the number of repeats. The process cab be repeated without
reloading if the number in the counter is correct for the new
sequence.

The ROM is desirably 8-~bits in length where the 4 most signif~
icant bits define the overall function to be carried out and
the 4 least significant bits define the particular step in the
sequence of steps defining the overall function.

Volume 2 Number 6 November/December 1977 99

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XEROX DISCLOSURE JOURNAL

100 Volume 2 Number 6 November/December 1977

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