Date: Mon, 11 Mar 1996 08:08:12 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
To: Ralph A Pope <rpope AT saclink1 DOT csus DOT edu>
Cc: djgpp AT delorie DOT com
Subject: Re: Newbie Questions
In-Reply-To: <4hns27$b6l@news.csus.edu>
Message-Id: <Pine.SUN.3.91.960311075331.3850E-100000@is>
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII


On 7 Mar 1996, Ralph A Pope wrote:

> OK, I've got several questions I REALLY want to know about:

Please download and read the DJGPP FAQ list (v2/faq200b.zip from the same 
site you get DJGPP).  Most of the questions you've asked are answered 
there.  The summary of answers is below.

> -Can I use Turbo C++ 3.0 DOS libs with djgpp?  If so how?

You can't.  Sorry.  (FAQ section 17.5, also 17.4 and 17.6.)

> -What's a good graphics/games library for djgpp (that's free)?

Some are listed in the FAQ, section 22.2.

> -How do I access video memory?  I don't know how to create a pointer to 
> it, like I used to with MK_FP(0xA000,0)

It's done differently in DJGPP.  There are several possible methods, all 
varying in speed vs. memory protection trade-off.  (FAQ sections 10.1, 
18.4, 18.6).

> -Will programs with the old keyword far, like in unsigned char far *, 
> still compile?

It will, if you define `far' away, like this:

	#define far

or on the compilation command line:

	gcc -Dfar= -c ....

And review carefully the code fragments that use `far', because they 
frequently use other techniques that would crash your program in 
protected mode.  See FAQ section 17.4 and chapter 18.

> -How do I access the XMS?  With malloc()?  Or some other special way?  If 
> so how?

There is no XMS, EMS or any other MS in DJGPP; it's just memory.  Call 
malloc(), calloc(), realloc() and forget (for a moment) that you run on 
16-bit MS-DOS.  See also FAQ chapter 15.

> -Are there any books on DJGPP and it's ilk, or something I can apply to 
> DJGPP?

Not that I know.  But you can write one ;-).

>  Also, are there any IDEs out?

v2/readme.1st suggests one such.