Browse Prior Art Database

Hardware Engineering Change Level Identification Register

IP.com Disclosure Number: IPCOM000100875D
Original Publication Date: 1990-Jun-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Pettit, PO: AUTHOR [+2]

Abstract

A method is disclosed that provides a simple, low cost, highly reliable, tamper-proof design that allows a visual and software readable engineering change level identification register.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 56% of the total text.

Hardware Engineering Change Level Identification Register

       A method is disclosed that provides a simple, low cost,
highly reliable, tamper-proof design that allows a visual and
software readable engineering change level identification register.

      Electronic card assemblies normally have an engineering change
(E.C.) level number associated with them.  This number is usually
carried in the documentation for the electronic assembly.  This
disclosure proposes that an E.C. identification number be placed on
the card that provides a means for software to read the
identification number and a visual means of determining the E.C.
level of the card assembly.

      The ability for software to be capable of reading the E.C.
level is very important.  Some engineering changes to the hardware
require software changes for the device to operate properly.  By
allowing software to read the E.C. level of the card, software can
decide if the software and hardware are compatible.  If the two are
incompatible, an error can be reported by software.

      There are several means of implementing an E.C. level
identification register.  One way would be to use switches. This
method has the disadvantage of being easily or inadvertently changed.
Another method would be to use a Programmable Read Only Memory
(PROM).  This method has the disadvantage of not having a good means
of visual inspection and can be expensive if many E.C.'s are needed.
Another method would be...