Path: utzoo!attcan!uunet!wa3wbu!john
From: john@wa3wbu.UUCP (John Gayman)
Newsgroups: comp.sys.ibm.pc
Subject: Re: extended vs. expanded
Summary: extended is > than 1024K
Message-ID: <676@wa3wbu.UUCP>
Date: 23 Nov 88 11:42:43 GMT
References: <1717I78BC@CUNYVM> <1090@esunix.UUCP> <1970@hoqax.UUCP>
Organization: WA3WBU, Marysville,PA
Lines: 24

In article <1970@hoqax.UUCP>, twb@hoqax.UUCP (T.W. Beattie) writes:
> In article <1090@esunix.UUCP> bpendlet@esunix.UUCP (Bob Pendleton) writes:
> >From article <1717I78BC@CUNYVM>, by I78BC@CUNYVM.CUNY.EDU (Michael Polymenakos):
> >One question that I have not been able to get a good answer for is the
> >difference between "extended" and "expanded" memory. Can someone
> >please explain it to me?
> I'll try.
> Extended memory is the 384K between 640K and 1M.
> Expanded memory is the RAM above 1M.

     This is one very confusing aspect of extended memory. Actually the
384K you have additional on the motherboard lies *above* 1MB. The 
addressing region between 640K and 1MB is reserved for Video, BIOS, et al.
So when you have a motherboard with 640K conventional and 384K extended,
your top address is actually 1408K. 

						John



-- 
John Gayman, WA3WBU              |           UUCP: uunet!wa3wbu!john
1869 Valley Rd.                  |           ARPA: john@wa3wbu.uu.net 
Marysville, PA 17053             |           Packet: WA3WBU @ AK3P