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From: bright@dataio.UUCP (Walter Bright)
Newsgroups: net.micro
Subject: Re: Small, Medium and Large Models
Message-ID: <736@dataio.UUCP>
Date: Mon, 29-Jul-85 07:55:11 EDT
Article-I.D.: dataio.736
Posted: Mon Jul 29 07:55:11 1985
Date-Received: Wed, 31-Jul-85 08:13:04 EDT
Reply-To: bright@dataio.UUCP (Walter Bright)
Organization: Data I/O Corp., Redmond WA
Lines: 29

In article <411@kontron.UUCP> cramer@kontron.UUCP (Clayton Cramer) writes:
>Small           all code in one 64K segment
>                all data in one 64K segment (including stack)
>                
>Medium          code can occupy several segments, none more than 64K long
>                all data in one 64K segment (including stack)
>
>Large           code can occupy several segments, none more than 64K long
>                data can occupy several segments, none more than 64K long
		 Also, address calculations are done on the offset portion
		 of the address only, thus limiting arrays and dynamically
		 allocated memory to chunks smaller than 64k. Pointers
		 cannot be subtracted if their segment values are different.
>                
>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.)

Tiny		Code plus statically allocated data fits in 64k. This is
		so a .COM file can be created.

Huge		Address calculations are done on both the segment and
		offset. Statically allocated arrays still must be less
		than 64k.

Large Data	Data can be > 64k, but code must be < 64k.

Under any model, the stack size is limited to 64k.