Path: utzoo!censor!geac!jtsv16!uunet!tut.cis.ohio-state.edu!ucbvax!agate!bionet!ames!ll-xn!mit-eddie!uw-beaver!tektronix!reed!busker!p8.f14.n105.z1.FIDONET.ORG!Howard.Spindel 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. -- Howard Spindel - via FidoNet node 1:105/14 UUCP: ...!{uunet!oresoft, tektronix!reed}!busker!14.8!Howard.Spindel ARPA: Howard.Spindel@p8.f14.n105.z1.FIDONET.ORG