Browse Prior Art Database

DIAGNOSIS OF FLOPPY DISC CONTROLLER

IP.com Disclosure Number: IPCOM000024218D
Original Publication Date: 1979-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 66K

Publishing Venue

Xerox Disclosure Journal

Abstract

With the advent of sophisticated word processor systems, it is desirable to minimize the downtime due to equipment failures. One tool to minimize the down time is system diagnostics, which would allow rapid determination and repair of any failure.

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(EROX DISCLOSURE JOURNAL

DIAGNOSIS OF FLOPPY DISC CONTROLLER Classification Proposed Ronald J. Quagliara U.S. C1. 364/550

Int. C1. GOlm 15/00

With the advent of sophisticated word processor systems, it is desirable to minimize the downtime due to equipment failures. One tool to minimize the down time is system diagnostics, which would allow rapid determination and repair of any failure.

A concept is disclosed, which will facilitate quick diagnosis of a particular subsystem to determine the location of any failure and allow quick repair or replacement thereof. A self-test capability is provided which can be performed by the operator using built-in circuitry. The particular subsystem involved is the floppy disc controller (FDC) which provides the interface, the data bus and the disc drive. The mechanism to be used for diagnosing the FDC is provided by a 1K x 1 RAM, which would be operated in conjunction with the system bus to diagnose the write encode, read decode, 1/0 and R/W registers, gap control and miscellaneous gating and control logic. Diagnostic software would be loaded via the disc to facilitate testing in conjunction with a central processor unit of approximately 16 test points by using four different data paths. The four data paths would be: system bus to RAM via read decoder, RAM to RAM to system bus, direct memory access to RAM via write encoder and disc to RAM via read decoder. In addition to the diagnostic RAM, command registers, disc status, FDC sta...