recognize XDOS -- patch from Stefan Haubenthal

git-svn-id: svn://svn.cc65.org/cc65/trunk@5524 b7a2c559-68d2-44c3-8de9-860c34a00d81

asminc/atari.inc

@@ -1093,6 +1093,7 @@ ATARIDOS     = 0
 SPARTADOS    = 1
 OSADOS       = 2	; OS/A+
 MYDOS        = 3
+XDOS         = 4
 NODOS        = 255
 
 ;-------------------------------------------------------------------------

doc/atari.sgml

@@ -96,12 +96,13 @@ header file.
 
 <sect1>Atari specific functions<p>
 
-The functions listed below are special for the Atari. See the <htmlurl
-url="funcref.html" name="function reference"> for declaration and usage.
+The functions and global variable listed below are special for the Atari.
+See the <htmlurl url="funcref.html" name="function reference"> for declaration and usage.
 
 <itemize>
 <item>get_ostype
 <item>get_tv
+<item>_dos_type
 <item>_gtia_mkcolor
 <item>_getcolor
 <item>_getdefdev

include/atari.h

@@ -196,6 +196,7 @@ extern unsigned char _dos_type;        /* the DOS flavour */
 #define SPARTADOS   1
 #define OSADOS      2
 #define MYDOS       3
+#define XDOS        4
 #define NODOS       255
 
 /* Define hardware */

libsrc/atari/dosdetect.s

@@ -13,20 +13,18 @@
 
 .segment	"INIT"
 
-detect:	lda	#ATARIDOS
-	sta	__dos_type	; set default
-
-	lda	DOS
+detect:	lda	DOS
 	cmp	#'S'		; SpartaDOS
 	beq	spdos
 	cmp	#'M'		; MyDOS
 	beq	mydos
+	cmp	#'X'		; XDOS
+	beq	xdos
 
+	lda	#$4C		; probably default
 	ldy	#COMTAB
-	lda	#$4C
 	cmp	(DOSVEC),y
 	bne	done
-
 	ldy	#ZCRNAME
 	cmp	(DOSVEC),y
 	bne	done
@@ -41,6 +39,9 @@ spdos:	lda	#SPARTADOS
 	.byte	$2C		; BIT <abs>
 
 mydos:	lda	#MYDOS
+	.byte	$2C		; BIT <abs>
+
+xdos:	lda	#XDOS
 	sta	__dos_type
 done:	rts
 
@@ -49,5 +50,4 @@ done:	rts
 
 	.bss
 
-__dos_type:	.res	1
-
+__dos_type:	.res	1	; default to ATARIDOS