atari: new file for xbios defines

git-svn-id: trunk@34661 -

.gitattributes

@@ -8412,6 +8412,7 @@ rtl/atari/sysosh.inc svneol=native#text/plain
 rtl/atari/system.pp svneol=native#text/plain
 rtl/atari/sysutils.pp svneol=native#text/plain
 rtl/atari/tthread.inc svneol=native#text/plain
+rtl/atari/xbios.inc svneol=native#text/plain
 rtl/avr/avr.inc svneol=native#text/plain
 rtl/avr/int64p.inc svneol=native#text/plain
 rtl/avr/makefile.cpu svneol=native#text/plain

rtl/atari/xbios.inc

@@ -0,0 +1,20 @@
+{
+    This file is part of the Free Pascal run time library.
+    Copyright (c) 2016 by Free Pascal development team
+
+    XBIOS related defines for Atari TOS
+
+    See the file COPYING.FPC, included in this distribution,
+    for details about the copyright.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+ **********************************************************************}
+
+
+{ The API description of this file is based on the information available
+  online at: http://toshyp.atari.org }
+
+function xbios_random: longint; syscall 14 17;