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From: lowey@herald.usask.ca (Kevin Lowey,159 Physics,(306) 966-4826,(306) 249-3232)
Newsgroups: comp.lang.pascal
Subject: Re: Turbo Pascal for UNIX platforms?
Message-ID: <1991Jun21.205524.26049@herald.usask.ca>
Date: 21 Jun 91 20:55:24 GMT
References: <PSHUANG.91Jun21160522@beeblebrox.mit.edu>
Sender: lowey@herald.usask.ca (Kevin Lowey)
Reply-To: lowey@herald.usask.ca
Organization: University of Saskatchewan
Lines: 20

From pshuang@athena.mit.edu (Ping-Shun Huang):

> I agree that code written in Turbo Pascal on Intel platforms would not
> easily port to UNIX systems for various reasons, but I don't think this
> would be one of the worst problems.  TP's solution for 64Kb code
> segments is to implement units; on UNIX systems, a TP-compatible
> compiler would simply compile *ALL* calls as being to 32-bit addresses,
> whereas the current DOS versions are supposed to be generating 16-bit
> calls internally to units and 32-bit calls between units.  Heck, the DOS
> compiler could move to 32-bit calls also (thus implementing what C
> usually calls the large model without any problems) in my opinion,

Turbo Pascal currently has a compiler option that forces far calls for
everything.  Thus, right now, you can have 32 bit calls in MS-DOS.  However,
you are still limited to 64K data segments, and at most 64K an any one code
segment (each unit is in a different segment).

This is accurate to TP 5.5.  I haven't tried 6.0 yet.

- Kevin Lowey