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From: Howard.Spindel@p8.f14.n105.z1.FIDONET.ORG (Howard Spindel)
Newsgroups: comp.sys.ibm.pc
Subject: Re: HIMEM.SYS  loading device drivers past 1Meg.
Message-ID: <847.24DA91F2@busker.FIDONET.ORG>
Date: 4 Aug 89 21:13:43 GMT
Organization: FidoNet node 1:105/14.8 - Busker's Boneyard, Portland OR
Lines: 44

> From: rogers@orion.SRC.Honeywell.COM (Brynn Rogers)
> Date: 31 Jul 89 19:53:21 GMT
> Organization: Honeywell Systems & Research Center, Camden,
> MN
> Message-ID: <26663@srcsip.UUCP>
> Newsgroups: comp.sys.ibm.pc
> 
> 
> I am under the impression that HIMEM.SYS can be loaded to
> use
> first 64K past 1Meg as real memory (on 286's only).
> 
> How do I get it to work? I have a good 50K of device
> drivers that
> suck up my memory.  I have tried it (HIMEM.SYS) in the past
> but it didn't
> seem to make a difference, but before I go experimenting
> with it
> again I would like to hear from someone who has it working
> right.
> (You need to have 1 Meg of memory to do this trick)
> 
> The trick that you can use on a 286 to get 640K +64K-16
> Bytes of
> real mode memory is this:
> on a 286 the segment FFFF:0000 to FFFF:FFFF is real memory
> located
> from 0FFFF0 to 10FFEF; but on a 8086 it wraps around from
> 0FFFF0 to 00FFEF.
> so 100000 to 10FFEF are available to be used ( FFFF0 to
> FFFFF is ROM,
> in fact, every 80x86 starts executing at FFFF0)
> Brynn Rogers    Honeywell S&RC        rogers@src.honeywell.
> com
> 612-782-7737                use this address if your
> reply bounces
> 
HIMEM.SYS allows a structured method of accessing 64KB of memory past the one megabyte limit.  It does not automatically tell an application program or device driver that more memory is available - the program or device driver must be coded specifically to use the new memory.  So unless your device driver has a specific configurable option to tell it to use high memory you won't see any affect by installing HIMEM.SYS.


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