Path: utzoo!attcan!uunet!cs.utexas.edu!usc!rutgers!psuvax1!psuvm!yxw3
From: YXW3@psuvm.psu.edu
Newsgroups: comp.binaries.ibm.pc.d
Subject: Re: Program under LIM EMS 4.0
Message-ID: <90293.201339YXW3@psuvm.psu.edu>
Date: 21 Oct 90 00:13:39 GMT
References: <90290.231454YXW3@psuvm.psu.edu>
Lines: 18
DELanization: Penn State University


     A couple of days later after I posting the note on how to program under
LIM EMS(Expanded Memory Specification) 4.0, I got a book titled "DOS program-
mer's reference" 2nd edition by Terry Dettmann and Jim Kyle, published by QUE
Corporation in 1989.  In the references of the book there are 44 page discussio
n on the subject I am interested in.  As pointed out by several other guys, a
copy of specification can be obtained from Intel by calling 800-538-3373 free
of charge.
     Basically, EMS is a sort of device driver.  Once installed, one can access
its function through int 67h.  The driver will map different pages(16k) of
expanded memory into somewhere below 1M memory limit so that one can use.  The
inconvenience is that one has to remember which page contains what data.
     It's a real pity to see people(and myself) spending a lot of time trying
to get around the 1M memory limit instead of making full use of power of modern
 hardware.  I wish people have better time with PC under OS/2 2.0 in future.
     Thank you very much for those who help.

     Y. WANG