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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

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.