Browse Prior Art Database

Microprocessor Identifier

IP.com Disclosure Number: IPCOM000114756D
Original Publication Date: 1995-Jan-01
Included in the Prior Art Database: 2005-Mar-29
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Hartfiel, JW: AUTHOR [+2]

Abstract

Disclosed is a device that enables the user to quickly and easily identify an Intel* 486 pin-compatible microprocessor. The requirement to use heat sinks that obscure the manufacturer's device identification markings and the interchangeability/upgradeability of the various types of Intel 486 microprocessors make this device useful and convenient. This device identifies the type of Intel 486 microprocessor but will not evaluate its complete functionality nor its rated clock speed.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Microprocessor Identifier

      Disclosed is a device that enables the user to quickly and
easily identify an Intel* 486 pin-compatible microprocessor.  The
requirement to use heat sinks that obscure the manufacturer's device
identification markings and the interchangeability/upgradeability of
the various types of Intel 486 microprocessors make this device
useful and convenient.  This device identifies the type of Intel 486
microprocessor but will not evaluate its complete functionality nor
its rated clock speed.

      Each device type in the Intel 486 family (i.e., 486DX, 486SX,
486DX2, etc.) is uniquely identified via a Component ID and a
Revision ID that can be electronically read from the DX register
after the microprocessor is powered up and reset.  Each of the
Component IDs and Revision IDs are unique and documented in the Intel
Data Book for that microprocessor type.  Rather than taking a
software-intensive approach which would require the exercise of the
unique functions for each of the 486 microprocessor types in order to
identify it, this device uses a minimum amount of software (contained
in 1k of EPROM) and hardware (under $50) to simply translate the
Component ID and Revision ID contained in the DX register after RESET
into the common name (i.e., 486DX, 486SX, etc.) which the user reads
from an LED display.  No speed rating for the 486 microprocessor can
be determined since that determination is performed on a device
tester by the manufacturer and the results recorded only in the
device identification markings.

...