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From: rl@cbnewsl.att.com (roger.h.levy)
Newsgroups: comp.sys.ibm.pc.misc
Subject: Re: Extended and Expanded memory
Summary: LIM 4.0 not dependent on HW
Message-ID: <1990Aug18.110025.28644@cbnewsl.att.com>
Date: 18 Aug 90 11:00:25 GMT
References: <26045@bellcore.bellcore.com>
Distribution: usa
Organization: AT&T Bell Laboratories
Lines: 17

In article <26045@bellcore.bellcore.com>, wind@rruxi.bae.bellcore.com (Wind Chen) writes:
> LIM 3.2 and LIM 4.0 are two different thing, they are not compatible.
> To use LIM 4.0, you will need hardware support, if you EMS board didn't say it
> supports LIM 4.0, chances are, it does NOT support.

Yes they are different but most of the rest is untrue.  From the Waite Group's
MSDOS Developer's Guide:

	The user does not have to buy any new hardware to use applications
	that are written to the LIM EMS 4.0 specification.  Older expanded
	memory boards designed for the LIM EMS 3.2 specification can
	support the 4.0 specification - the manufacturer just has to write
	a new EMM to implement the 4.0 function calls.

Established manufacturers such as AST do just this sort of thing.  Also, the
LIM 3.2 function calls exist in LIM 4.0 but 4.0 has more of them.  I would
call that "upward compatible" rather than "not compatible."