--- a/configure.in	Sun Aug 10 17:49:51 2003 +0000
+++ b/configure.in	Mon Aug 11 22:28:13 2003 +0000
@@ -2489,6 +2489,26 @@
         # MiNT does not define "unix"
         CFLAGS="$CFLAGS -Dunix"
         ;;
+    *-*-riscos)
+        ARCH=riscos
+        JOYSTICK_SUBDIRS="$JOYSTICK_SUBDIRS riscos"
+        JOYSTICK_DRIVERS="$JOYSTICK_DRIVERS riscos/libjoystick_riscos.la"
+        COPY_ARCH_SRC(src/timer, riscos, SDL_systimer.c)
+        COPY_ARCH_SRC(src/main, linux, SDL_main.c)
+        VIDEO_SUBDIRS="$VIDEO_SUBDIRS riscos"
+        VIDEO_DRIVERS="$VIDEO_DRIVERS riscos/libvideo_riscos.la"
+        AUDIO_SUBDIRS="$AUDIO_SUBDIRS riscos"
+        AUDIO_DRIVERS="$AUDIO_DRIVERS riscos/libaudio_riscos.la"
+
+        if test x$enable_cdrom = xyes; then
+            CDROM_SUBDIRS="$CDROM_SUBDIRS dummy"
+            CDROM_DRIVERS="$CDROM_DRIVERS dummy/libcdrom_dummy.la"
+        fi
+
+        CFLAGS="$CFLAGS -DDISABLE_THREADS -DENABLE_RISCOS -DDRENDERER_SUPPORT"
+
+        SYSTEM_LIBS="$SYSTEM_LIBS -ljpeg -ltiff -lpng -lz"
+        ;;
     *)
         AC_MSG_ERROR(Unsupported target:  Please add to configure.in)
         ;;

--- a/src/video/riscos/SDL_riscosvideo.c	Sun Aug 10 17:49:51 2003 +0000
+++ b/src/video/riscos/SDL_riscosvideo.c	Mon Aug 11 22:28:13 2003 +0000
@@ -177,8 +177,8 @@
 	regs.r[0] = -1; /* Current mode */
 	regs.r[1] = 9;  /* Log base 2 bpp */
 
-	_kernel_swi(OS_ReadVduVariables, &regs, &regs);
-	vformat->BitsPerPixel = (1 << regs.r[0]);
+	_kernel_swi(OS_ReadModeVariable, &regs, &regs);
+	vformat->BitsPerPixel = (1 << regs.r[2]);
 
 	/* Minimum bpp for SDL is 8 */
 	if (vformat->BitsPerPixel < 8) vformat->BitsPerPixel = 8;
@@ -191,7 +191,7 @@
 			vformat->Bmask = 0x00007c00;
 			vformat->Gmask = 0x000003e0;
 			vformat->Rmask = 0x0000001f;
-			vformat->BitsPerPixel = 15; /* SDL wants actual number of bits used */
+			vformat->BitsPerPixel = 16; /* SDL wants actual number of bits used */
 			vformat->BytesPerPixel = 2;
 			break;