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From: ephram@violet.berkeley.edu (Ephram Cohen;B50 Tolman Hall;25352;4156548978;LE56)
Newsgroups: comp.sys.ibm.pc,comp.sys.ibm.pc.programmer,comp.sys.ibm.pc.hardware
Subject: Re: extended memory problem in protected mode
Message-ID: <1991Jun10.211452.20706@agate.berkeley.edu>
Date: 10 Jun 91 21:14:52 GMT
References: <8980@drutx.ATT.COM>
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In article <8980@drutx.ATT.COM> rbj@druhi.ATT.COM (Russell B. Jorgensen) writes:
>I've been experimenting around with writing some protected mode programs
>for my PC/AT (iAPX286 processor w/ 4 Mb).  But, I've run into a snag
>when accessing memory over 1Mb.  Basically, both the 1st and 2nd meg of
>memory seem to be physically the same, the 3rd and 4th meg of memory the
>same, etc.  

I can not say for sure but it may be that address line 20 on the buss is
disabled.  There should be a function call to enable address line 20.  
You should mention what kind and version of BIOS you have.  

-- 
We must prevent those commies from compromising the integrity of our 
precious bodily fluids.      -Gen. Jack D. Ripper
Ephram Cohen                              ephram@violet.berkeley.edu
466 44th St.  #1                          3210 Tolman Hall