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From: bb@oliveb.UUCP (Bart Berger)
Newsgroups: net.micro.pc
Subject: Re: Removing a memory-resident program -- Help
Message-ID: <638@oliveb.UUCP>
Date: Wed, 20-Nov-85 20:20:09 EST
Article-I.D.: oliveb.638
Posted: Wed Nov 20 20:20:09 1985
Date-Received: Sat, 23-Nov-85 00:30:45 EST
References: <280@well.UUCP>
Organization: Olivetti ATC; Cupertino, Ca
Lines: 17

> When removing a previously loaded memory-resident program we cannot
> recover all of the memory.  It appears that DOS keeps 64 bytes each
> time.  What's the trick to getting back ALL of your memory when
> removing a resident program??
> 	Doug Kaye
> 	Rational Data Systems
> 	ihnp4!hplabs!well!drk

I believe that 64 bytes is the copy of the environment table that MS-DOS
makes for each program.  The trick is:  before releasing the program's
memory, release the environment table's memory.  The segment address of
the environment table is at offset 2C in the Program Segment Prefix; pass
that segment address to MS-DOS function 49h to release the environment
table space.  (Caveat:  I haven't tried this yet.)

							Bart Berger
        						...!oliveb!bb