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From: merlin@hqda-ai.UUCP (David S. Hayes)
Newsgroups: comp.unix.xenix,comp.sys.ibm.pc
Subject: DOS Emulation and Custom Devices
Message-ID: <416@hqda-ai.UUCP>
Date: Mon, 31-Aug-87 23:00:16 EDT
Article-I.D.: hqda-ai.416
Posted: Mon Aug 31 23:00:16 1987
Date-Received: Sat, 5-Sep-87 01:51:41 EDT
Followup-To: poster
Organization: Army AI Center, Pentagon
Lines: 31
Keywords: dos tsr xenix emulator
Summary: Can I run custom device drivers under DOS emulators?
Xref: mnetor comp.unix.xenix:661 comp.sys.ibm.pc:7358


     My brother works with a surveying company.  They use several
bits of CAD software to do their drafting.  Because accuracy of
the maps is absolutely critical, they use a very-high-resolution
graphics display.  Most of this software, and the device driver
for the display, are only available in MS-DOS versions.

     He would like to move to Xenix, but they can't abandon the
development already done in the MS-DOS environment.  I know there
are software packages that allow DOS programs to be run under
Xenix, but I don't know how good they are.  I would like to find
out:

1.   How do these programs handle terminate-and-stay-resident
     programs?  How do they run custom device drivers?  Do these
     programs actually load a DOS image, or do they simulate DOS?

2.   If the DOS program wants to do things like direct I/O port 
     access, is this allowed?

3.   Where do I get these programs?

     I don't normally read these groups (my PC is a Sun-3), so
please use EMAIL to reply.  If anyone expresses an interest, I'll
summarize in about 2 weeks.

     Adv [thanks] ance

-- 
David S. Hayes, The Merlin of Avalon	PhoneNet:  (202) 694-6900
UUCP:  *!seismo!sundc!hqda-ai!merlin	ARPA:  merlin%hqda-ai@seismo.css.gov