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Date: Wed, 14 Mar 2012 18:52:09 -0400
Message-Id: <201203142252.q2EMq930020661@envy.delorie.com>
From: DJ Delorie <dj AT delorie DOT com>
To: djgpp AT delorie DOT com
In-reply-to:
	<76288ff4-436b-4409-a22b-381f3bd0f3fa AT y17g2000yqg DOT googlegroups DOT com>
	(message from gerotica on Wed, 14 Mar 2012 15:27:11 -0700 (PDT))
Subject: Re: Dump extended memory
References: <76288ff4-436b-4409-a22b-381f3bd0f3fa AT y17g2000yqg DOT googlegroups DOT com>
Errors-To: nobody AT delorie DOT com


> how to use djgpp to dump the whole ram memory? What I need to know is
> how can I access every memory addresses continuously, as in real mode
> if I make a read from 00000h to FFFFFh...

There are some helper functions:

* dosmem*() functions access the first 1MB of ram
  http://www.delorie.com/djgpp/doc/libc/libc_190.html

* _far*() functions access all of memory using selector-offset pairs
  http://www.delorie.com/djgpp/doc/libc/libc_304.html

* <sys/nearptr.h> gives you access to a segment that effectively spans
  all physical memory.
  http://www.delorie.com/djgpp/doc/libc/libc_141.html