Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!umich!yale!cs.utexas.edu!samsung!munnari.oz.au!bruce!trlluna!rhea.trl.oz.au!bridge
From: bridge@rhea.trl.oz.au (andrew bridge)
Newsgroups: comp.lang.prolog
Subject: Re: Turbo Prolog Versions
Summary: The purpose of Turbo Prolog's PROLOG.SYS and PROLOG.OVL files.
Message-ID: <1021@trlluna.trl.oz>
Date: 9 Feb 90 06:08:47 GMT
References: <1641@skye.ed.ac.uk>
Sender: root@trlluna.trl.oz
Lines: 35

In article <1641@skye.ed.ac.uk>, jkk@aiai.uucp (John Kingston) writes:
> I have an application which requires Turbo Prolog, and a copy of Turbo Prolog.
> However, the application's README file says it requires a file called 
> PROLOG.OVL from the Prolog diskette. Yet our copy of Turbo doesn't have such
> a file - although it does have a PROLOG.SYS file, which isn't mentioned in
> the application, which uses all the other PROLOG.* files.
> 
>   Is the problem that our version of Turbo is out of date (the manual is
> copyright 1986)? Or are the instructions for the application at fault?
>   More generally, is there any upgrade policy for Turbo Prolog, or would
> anyone wanting to upgrade have to buy the whole system again?
> 
>  Is there any way I could hack the PROLOG.SYS file to make it compatible with
> later releases of Turbo? 

	I don't the exact answer to your problem but may be able to
point you in the right direction.

	PROLOG.SYS --> the purpose of this file is to store the TURBO
environment in which you are working, i.e window sizes and positions on
the screen, the Stack size, ect.  This is setup via one of the menu
options (sorry can't rember which one).

	PROLOG.OVL --> this file is used when generating executable
code, and must be in the same directory as all the other PROLOG.* files.

	So what I'm saying is these two files serve totally different
purposes.

	I may be able to offer some other advice if required so don't
hesitate to contact me.

	Andrew Bridge, Telecom Australia, 1/M6, PO Box 249,
	Clayton, Victoria, 3168, Australia.
	Phone No :- 03 541 6505  Fax No :- 03 543 6026