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From: zielke@romeo.cs.duke.edu (David Zielke c/o hsg)
Newsgroups: comp.sys.ibm.pc
Subject: Patching ROMs
Keywords: ROM Patch
Message-ID: <19838@duke.cs.duke.edu>
Date: 27 May 90 04:17:05 GMT
Sender: news@duke.cs.duke.edu
Lines: 24




  I own an IBM-AT with the original 6mhz non-speed limiting ROMs.  The only
problem being that to install a Seagate 4096 drive requires the use of
drivers which are not operating system independent.  (i.e. bringing up a
non-dos operating system, it only sees part of the drive).  The solution
seems to be to patch the ROM drive table at location F000:E4xx.  This
appears to be simple enough, however, I remember that the POST facility
does some form of checksum on the ROM itself to verify integrity.  Does
anyone know where this is stored and how it is computed?

  Many thanks...

	David Zielke

zielke@phy.duke.edu
zielke@cs.duke.edu
zielke@ccf3.nrl.navy.mil

________________________________________________________________________
|  Name:		David M. Zielke					|
|  Internet:		zielke@physics.phy.duke.edu			|
|			zielke@cs.duke.edu				|