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- Xref: sparky comp.unix.msdos:904 comp.unix.solaris:119 comp.unix.sysv386:12619
- Newsgroups: comp.unix.msdos,comp.unix.solaris,comp.unix.sysv386
- Path: sparky!uunet!scorn!scolex!ezras
- From: ezras@sco.COM (Ezra Steinberg)
- Subject: Re: ISC VP/ix Question(s)
- Organization: The Santa Cruz Operation, Inc.
- Date: Wed, 29 Jul 1992 20:43:52 GMT
- Message-ID: <1992Jul29.204352.23016@sco.COM>
- Summary: DOS-under-UNIX
- Keywords: ISC Unix VP/ix
- References: <1992Jul13.195308.21397@access.digex.com> <BrGHIn.IMn@ernest.dseg.ti.com>
- Sender: ezras@sco.com (Ezra Steinberg)
- Lines: 21
-
-
- In article <BrGHIn.IMn@ernest.dseg.ti.com> alan@ernest.dseg.ti.com (Alan Edmonds) writes:
- >In article <1992Jul13.195308.21397@access.digex.com> jcraig@access.digex.com (Joseph N. Craig) writes:
- >>We have been somewhat disappointed to discover that VP/ix that comes with
- >>ISC Unix emulates 286 class machines. We have some software that requires
- >>386 machines.
- >
- >I believe most DOS-under-Unix products (Merge,VP/ix,etc.) all are
- >80286 style emulators. I think they work by using the virtual-8086 mode
- >of the 386, where you create a virtual 8086 processor. If this is true,
- >you won't find any DOS-under-Unix 386 style SW. In fact, if you do allow
- >access to real/protected mode under DOS app, it could (would) easily
- >crash Unix.
-
- If the 80386 cpu is being used to create virtual 8086s (i.e. running
- programs only in real mode), then programs designed to run on 80286
- cpus or better (i.e. in protected) mode will not be able to run with
- one of these emulators. Currently, I believe all popular emulators
- use the virtual 8086 method; hence, only real-mode programs can be run.
-
- Ezra Steinberg
-