Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!rochester!uhura.cc.rochester.edu!ur-valhalla!jal
From: jal@ee.rochester.edu (John Lefor)
Newsgroups: comp.sys.ibm.pc
Subject: Need Help with ROM/empty address distinction
Message-ID: <1990Jan15.162053.14109@ee.rochester.edu>
Date: 15 Jan 90 16:20:53 GMT
Reply-To: jal@ee.rochester.edu
Organization: University of Rochester Dept. of Electrical Engineering
Lines: 19

I am trying to write a program which can tell me what is going at
at various memory locations.  I am trying to distinguish between 
RAM,  ROM and nothing at all addresses.  Now I have no problem
distinguishing between RAM and ROM,  but how do I distinguish between
ROM and nothing.  In my experiments nothing sometimes is read as the
same hex data and other times the data changes between reads.

ANy suggestions would be much appreciated.

Thanks.



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I program ... therefore I am.

John Lefor    	University of Rochester		Dept of E. Engineering
716-275-8265	jal@ee.rochester.edu		uunet!ur-valhalla!jal