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			<h2 class="western" style="font-variant: normal; font-style: normal">
			<font size="5" style="font-size: 20pt">Writing applications for
			ELKS in C with gcc-ia16</font></h2>
			<p style="margin-bottom: 0.5cm"><font face="Arial, sans-serif">You
			can develop application programs for ELKS by cross-compiling them
			on a standard Linux system with the gcc-ia16 compiler. Because
			this compiler is also used to compile ELKS, the gcc-ia16 compiler
			is usually installed in the &bdquo;cross&ldquo; directory of the
			ELKS directory after you downloaded and compiled ELKS.</font></p>
			<p style="margin-bottom: 0.5cm"><font face="Arial, sans-serif">For
			a test let's compile a 'hello world' program and run that in ELKS.
			Here is the code:</font></p>
			<pre class="western">#include&lt;stdio.h&gt;

int main() {
        printf(&quot;Hello World\n&quot;);
        return 0;
}</pre><p style="margin-bottom: 0.5cm">
			<font face="Arial, sans-serif">Make a new &bdquo;testing&ldquo;
			directory and copy and save this with a text editor as 'hello.c'
			in e.g. an elks/testing directory. Then get into this directory
			and enter:</font></p>
			<p style="margin-bottom: 0.5cm"><font face="Liberation Mono, monospace"><font size="2" style="font-size: 10pt">ia16-elf-gcc
			hello.c -o hello -melks-libc -mcmodel=small</font></font></p>
			<p style="margin-bottom: 0.5cm"><font face="Arial, sans-serif"><font size="3" style="font-size: 12pt">This
			will compile the hello executable in the testing directory. The
			&bdquo;-melks-libc&ldquo; specifies to use the libc in the elks
			directory and &bdquo;-mcmodel=small&ldquo; specifies to compile
			the program using the small model. Currently ELKS can only load
			programs generated for 128k using the small model. This will be up
			to 64k of code and up to 64k of data and stack in two separate
			segments.</font></font></p>
			<p style="margin-bottom: 0.5cm"><font face="Arial, sans-serif"><font size="3" style="font-size: 12pt">To
			see if this program works with ELKS enter: &bdquo;../elksemu/elksemu
			hello&ldquo; on the command line. The elksemu emulator will run
			the hello program then.</font></font></p>
			<p style="margin-bottom: 0.5cm"><font face="Arial, sans-serif"><font size="3" style="font-size: 12pt">If
			you want to run the hello executable with ELKS you have to put it
			e.g. into the directory 'usr/bin' on the ELKS disk image, e.g. the
			'fd1440.bin' image file. You can load an existing ELKS image as a
			loop device on Linux and then copy the new executable to this
			image. To do this you can use a script with the following lines: </font></font>
			</p>
			<pre class="western">set -x
mount -o loop image/fd1440.bin floppy1
cp testing/hello floppy1/bin
umount floppy1</pre><p style="margin-bottom: 0.5cm">
			<font face="Arial, sans-serif">Execute this script with 'sudo' !
			This script assumes that you are in the 'elks' directory and that
			the 'fd1440.bin' image file is in the image directory. Also there
			has to be a 'floppy1' directory within the 'elks' directory which
			will be used for the loop device. </font>
			</p>
			<p style="margin-bottom: 0.5cm"><font face="Arial, sans-serif">You
			may wonder why Linux can access this floppy image since it is
			using the Minix file system. The reason is that Linux can use the
			Minix file system for floppy disks as well. Newer Linux
			distributions often blacklist this file system. Enter &bdquo;modprobe
			-v minix&ldquo; to load this file system or add it to the
			&bdquo;etc/modprobe.d&ldquo; file to have it available after a
			reboot.</font></p>
			<p style="margin-bottom: 0.5cm"><font face="Arial, sans-serif">Then
			call qemu to run ELKS and call your program. Either run the
			&bdquo;./qemu.sh&ldquo; script in the elks directory or enter:</font></p>
			<pre class="western" style="margin-bottom: 0.5cm">qemu-system-i386 -fda <font face="Liberation Mono, monospace"><font size="2" style="font-size: 10pt">image/fd1440.bin</font></font></pre><p style="margin-bottom: 0.5cm">
			<font face="Arial, sans-serif">After ELKS has booted, log in as
			&bdquo;root&ldquo; and type cd ../bin and execute the ./hello
			program in there. </font>
			</p>
			<p style="margin-bottom: 0.5cm"><font face="Arial, sans-serif">If
			you have to repeat this frequently while developing your program,
			you can put these commands into the '.profile' script for root
			which is in the /root directory. Then your program will be run as
			soon as you log in as root.</font></p>
			<p style="margin-bottom: 0.5cm"><font face="Arial, sans-serif">Another
			alternative is to make a directory in the ELKS source code, write
			a Makefile for your application program and then compile ELKS
			including your program. </font>
			</p>
			<p style="margin-bottom: 0.5cm"><font face="Arial, sans-serif">Finally,
			you could set up an ftp server on your Linux host and use the
			ftpget progam on ELKS to download the executable to ELKS and run
			it there. There is another document that describes how to set up a
			tcp/ip connection between ELKS running in Qemu and your Linux
			system.</font></p>
			<h2 class="western" style="font-variant: normal; font-style: normal">
			<font size="5" style="font-size: 20pt">Writing applications for
			ELKS in C with the bcc compiler</font></h2>
			<p style="margin-bottom: 0.5cm"><font face="Arial, sans-serif">ELKS
			and application programs for ELKS can be made by</font>
			<font face="Arial, sans-serif">cross-compiling them</font> <font face="Arial, sans-serif">on
			a standard Linux system with the dev86 package. This contains the
			bcc C compiler, the ld86 linker, the as86 assembler and the ar86
			archiver. You can download the dev86 package from the repository
			of your Linux distribution or download it here:
			<a href="https://github.com/jbruchon/dev86">https://github.com/jbruchon/dev86</a>.
			Then compile and install it from this source code. Enter make in
			the main directory for that and &bdquo;quit&ldquo; when the
			configuration menu is displayed. </font>
			</p>
			<p style="margin-bottom: 0.5cm"><font face="Arial, sans-serif">For
			a start let's compile a &bdquo;hello world&ldquo; program and run
			that in ELKS. Here is the code:</font></p>
			<pre class="western">#include&lt;stdio.h&gt;

int main() {
        printf(&quot;Hello World\n&quot;);
        return 0;
}</pre><p style="margin-bottom: 0.5cm">
			<font face="Arial, sans-serif">Copy and save this as hello.c with
			a text editor. Then enter </font>
			</p>
			<pre class="western" style="margin-bottom: 0.5cm">bcc -ansi hello.c -o hello</pre><p style="margin-bottom: 0.5cm">
			<font face="Arial, sans-serif">We always use the -ansi switch here
			because otherwise bcc will assume K&amp;R style. </font>
			</p>
			<p style="margin-bottom: 0.5cm"><font face="Arial, sans-serif"><font size="3" style="font-size: 12pt">To
			see if this program will work with ELKS enter: &bdquo;../elksemu/elksemu
			hello&ldquo; on the command line. The elksemu emulator will run
			the hello program then. Or use one of the alternatives described
			above</font> <font size="3" style="font-size: 12pt">for the
			gcc-ia16 compiler.<br/>
</font>If an error number is returned you
			can look that up in the file &bdquo;elks\include\arch\errno.h&ldquo;.</font></p>
			<p style="margin-bottom: 0.5cm"><font face="Arial, sans-serif">The
			bcc compiler has been ported to DOS so you can also develop ELKS
			applications in DOS or a Windows 32bit DOS box:
			<a href="https://ftp.gwdg.de/pub/misc/freedos/files/devel/c/bcc/">https://ftp.gwdg.de/pub/misc/freedos/files/devel/c/bcc/</a>
			This includes doselks.com to run the compiled programs. </font>
			</p>
			<h2 class="western" style="margin-top: 0cm; margin-bottom: 0.5cm"><span style="font-variant: normal"><font face="Arial, sans-serif"><font size="5" style="font-size: 20pt"><span style="font-style: normal">Writing
			applications for ELKS with the Turbo-C compiler</span></font></font></span></h2>
			<p style="margin-bottom: 0.5cm"><font face="Arial, sans-serif">Alfonso
			Martone found a way to convert DOS Turbo-C programs to enable
			these to run with ELKS:
			<a href="http://www.alfonsomartone.itb.it/fhlvnr.html">http://www.alfonsomartone.itb.it/fhlvnr.html</a></font>
			<font face="Arial, sans-serif">For this</font> <font face="Arial, sans-serif">he
			developed the exe2elks DOS utility program and a small libc
			without DOS system calls. </font>
			</p>
			<p style="margin-bottom: 0.5cm"><font face="Arial, sans-serif">You
			compile your</font> <font face="Arial, sans-serif">C program with
			this small libc library instead of the standard Turbo-C libc. Then
			you use the exe2elks utility to convert the generated executable
			in the DOS EXE format to a 16bit OMAGIC aout file as required by
			ELKS.</font> 
			</p>
			<p style="margin-bottom: 0.5cm"><font face="Arial, sans-serif">The
			exe2elks program may work for DOS TASM assembler programs as well
			if you get TLINK to generate a map file.</font></p>
			<p><font face="Arial, sans-serif">14</font><sup><font face="Arial, sans-serif">th</font></sup>
			<font face="Arial, sans-serif">of </font><font face="Arial, sans-serif">April</font><font face="Arial, sans-serif">
			2020</font> <font face="Arial, sans-serif">Georg Potthast</font></p>
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