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- From: pierce@cruzio.santa-cruz.ca.us
- Newsgroups: comp.os.msdos.misc,comp.sys.ibm.pc.misc
- Subject: Re: Info about EMM386 and DOS=HIGH wanted!!!
- Summary: dos=high means just that!
- Message-ID: <4963@cruzio.santa-cruz.ca.us>
- Date: Thu, 21 Jan 93 18:46:28 PST
- References: <1993Jan7.081002.1841@wega.rz.uni-ulm.de>
- Sender: pierce@cruzio.santa-cruz.ca.us
- Reply-To: pierce@cruzio.santa-cruz.ca.us
- Lines: 32
-
- In article <1993Jan7.081002.1841@wega.rz.uni-ulm.de>, S_BUCK@rzmain.rz.uni-ulm.de (Buck Martin) writes:
- > I need some information about Mess-DOS 5.0's EMM386-driver and the
- > DOS=HIGH feature.
- >
- > I'd also like to know, if there is any (shareware) expanded-memory-
- > manager for the 386 that doesn't switch the CPU to virtual mode (if
- > this is possible at all). If such an emulator exists, where can I get
- > it from?
-
- Uh, unless you have a motherboard chipset that supports hardware EMS,
- no way. Virtual mode is the only way you can enable the paging feature
- needed to emulate EMS on a 386.
-
-
- > Does anybody know, how to force DOS into low memory though there is a
- > DOS=HIGH statement (it must be possible; I've seen 2 multi-configura-
- > tion-programs doing this)?
-
- Uh, DOS=HIGH means just that! It tells DOS to load HIGH. If you don't
- want DOS to load HIGH, don't use DOS=HIGH! The HMA is still available
- to other software as long as HIMEM.SYS is loaded and DOS is not loaded
- high.
-
- As far as I know, EMM386 only uses the memory you tell it to use. However,
- it allocates this memory from the XMS pool (which HIMEM.SYS manages). OLD
- programs that try and access extended memory directly without using XMS
- services won't see any if HIMEM is loaded. New software uses HIMEM
- to manage extended memory as "XMS" memory and all is happy.
-
- -john r pierce
- hacker at large
-
-