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From: wilker@descartes.math.purdue.edu (Clarence Wilkerson)
Newsgroups: comp.binaries.ibm.pc.d
Subject: Re: rom bios extensions
Keywords: rom bios extension eeprom eprom
Message-ID: <13323@mentor.cc.purdue.edu>
Date: 25 Aug 90 14:53:15 GMT
References: <26800@usc.edu>
Sender: news@mentor.cc.purdue.edu
Reply-To: wilker@descartes.math.purdue.edu (Clarence Wilkerson)
Organization: Purdue University, West Lafayette
Lines: 6

The beginning bytes are 55(hex), aa(hex), # of 512 byte pages in rom,
and at position 3, a jump to the initialization code. The 8 bit
checksum over the entire image should be zero.
  Anything else is up to you. Commonly, interrupt vectors are
set and hardware initialized, and interrupt routines are in the
rom.