Article View: comp.sys.ibm.pc.misc
Article #6763Re: How does 386 DOS deal with 8086 binaries?
From: Michael Davidson
Date: Thu, 10 Jan 1991 23:33
Date: Thu, 10 Jan 1991 23:33
21 lines
1301 bytes
1301 bytes
In article <49932@sequent.UUCP> kak@sequent.uucp (Keith Kelleman) writes: > >I have some questions about DOS on the 386: >Does it run in 386 native mode or 8086 emulation mode? If you mean MSDOS from Microsoft, then the answer is that it runs on 80386 machines the same way that it runs on 8086 and 80286 machines - it runs in 8086 real-mode. >Is virtual 8086 mode used by DOS on the 386 >i.e. to execute old XT and AT binaries? >or must all executables use the 386 instruction set? Quite the reverse - everything is assumed to be 8086 real-mode. If an application is smart enough to figure out that it is running on a 386 and to take advantage of it then, of course, there is nothing that DOS can do to stop it, but you have to be in either real-mode or virtual 8086 mode to actually make use of any DOS system services.
Technical Details
Message-ID:
<9524@scolex.sco.COM>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!thunder.mcrcim.mcgill.edu!snorkelwacker.mit.edu!apple!usc!samsung!uunet!sco!mdReferences:
<49932@sequent.UUCP>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!thunder.mcrcim.mcgill.edu!snorkelwacker.mit.edu!apple!usc!samsung!uunet!sco!md From: md@sco.COM (Michael Davidson) Newsgroups: comp.sys.ibm.pc.misc Subject: Re: How does 386 DOS deal with 8086 binaries? Message-ID: <9524@scolex.sco.COM> Date: 10 Jan 91 23:33:37 GMT References: <49932@sequent.UUCP> Sender: news@sco.COM Organization: The Santa Cruz Operation, Inc. Lines: 21