Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/18/84; site kontron.UUCP
Path: utzoo!linus!philabs!prls!amdimage!amdcad!amd!pesnta!pertec!kontron!cramer
From: cramer@kontron.UUCP (Clayton Cramer)
Newsgroups: net.micro
Subject: Re: Small, Medium and Large Models
Message-ID: <411@kontron.UUCP>
Date: Thu, 25-Jul-85 13:43:41 EDT
Article-I.D.: kontron.411
Posted: Thu Jul 25 13:43:41 1985
Date-Received: Sun, 28-Jul-85 07:22:19 EDT
References: <11609@brl-tgr.ARPA>
Organization: Kontron Electronics, Irvine, CA
Lines: 30

> 
> Could anybody out there take the time to give me a definition of the sizes
> of memory models referred to as small, large and whatever.  Are there specific
> sizes intended or is it a matter of rough scale?
> 
> Thanks,
> LMTRA@SRI-KL.arpa
> (Leon Traister)
> 
> -------

On the Intel 8086 family of processors (yes, I know many of you consider this
family to consist entirely of the illegitimate and addlepated), there are
several different memory models because of the segmented architecture of
the 8086 family.  For Microsoft and Intel software, the following models 
have the following names:

Small           all code in one 64K segment
                all data in one 64K segment
                
Medium          code can occupy several segments, none more than 64K long
                all data in one 64K segment

Large           code can occupy several segments, none more than 64K long
                data can occupy several segments, none more than 64K long
                
There are reputed to be other models supported by other compiler writers,
with names like Tiny and Huge, but in what way they differ from the
"official" models, I'm not sure.  (Maybe there's room for more models, with
names like Federal.)