--- src/osd/sdl/drawsdl.c	2010-10-21 21:42:07.000000000 +0200
+++ src/osd/sdl/drawsdl.c	2010-10-21 21:55:24.672745868 +0200
@@ -623,11 +623,15 @@
 	{
 		sdlwindow_blit_surface_size(window, window->width, window->height);
 	}
+	else if (window->nativeres)
+	{
+		sdlwindow_blit_surface_size(window, window->minwidth, window->minheight);
+	}
 	else
 	{
 		sdlwindow_blit_surface_size(window, window->monitor->center_width, window->monitor->center_height);
 	}
-	if (!sdl->scale_mode->is_scale)
+	if (!sdl->scale_mode->is_scale || (window->nativeres && window->fullscreen))
 		window->target->set_bounds(window->blitwidth, window->blitheight, sdlvideo_monitor_get_aspect(window->monitor));
 	else
 		window->target->set_bounds(sdl->hw_scale_width, sdl->hw_scale_height);
--- src/osd/sdl/osdsdl.h	2010-10-21 21:42:07.000000000 +0200
+++ src/osd/sdl/osdsdl.h	2010-10-21 21:52:59.721829064 +0200
@@ -54,6 +54,7 @@
 #define SDLOPTION_CENTERH				"centerh"
 #define SDLOPTION_CENTERV				"centerv"
 #define SDLOPTION_PRESCALE				"prescale"
+#define SDLOPTION_NATIVERES				"nativeres"
 
 #define SDLOPTION_SCALEMODE				"scalemode"
 #define SDLOPTION_MULTITHREADING		"multithreading"
--- src/osd/sdl/sdlmain.c	2010-10-21 21:42:07.000000000 +0200
+++ src/osd/sdl/sdlmain.c	2010-10-21 21:52:59.722828992 +0200
@@ -81,6 +81,7 @@
 	{ SDLOPTION_MULTITHREADING ";mt",         "0",        OPTION_BOOLEAN,    "enable multithreading; this enables rendering and blitting on a separate thread" },
 	{ SDLOPTION_NUMPROCESSORS ";np",         "auto",      0,				 "number of processors; this overrides the number the system reports" },
 	{ SDLOPTION_SDLVIDEOFPS,                  "0",        OPTION_BOOLEAN,    "show sdl video performance" },
+	{ SDLOPTION_NATIVERES ";nr",              "0",        OPTION_BOOLEAN,    "UNOFFICIAL: enable native game resolutions in fullscreen mode (-video soft only)" },
 	// video options
 	{ NULL,                                   NULL,       OPTION_HEADER,     "VIDEO OPTIONS" },
 // OS X can be trusted to have working hardware OpenGL, so default to it on for the best user experience
--- src/osd/sdl/window.c	2010-10-21 21:42:07.000000000 +0200
+++ src/osd/sdl/window.c	2010-10-21 21:52:59.723829011 +0200
@@ -678,6 +678,9 @@
 	// FIXME: Does not belong here
 	window->startmaximized = options_get_bool(machine->options(), SDLOPTION_MAXIMIZE);
 
+	// determine desire for native game resolution
+	window->nativeres = options_get_bool(mame_options(), SDLOPTION_NATIVERES);
+
 	if (!window->fullscreen)
 	{
 		window->windowed_width = config->width;
--- src/osd/sdl/window.h	2010-10-21 21:42:07.000000000 +0200
+++ src/osd/sdl/window.h	2010-10-21 21:52:59.723829011 +0200
@@ -67,6 +67,7 @@
 	int					windowed_width;
 	int					windowed_height;
 	int					startmaximized;
+	int					nativeres;
 
 	// rendering info
 	osd_event *			rendered_event;