diff --git a/dist/jb/jbhook-01.conf b/dist/jb/jbhook-01.conf
index 4e26beb..c498611 100755
--- a/dist/jb/jbhook-01.conf
+++ b/dist/jb/jbhook-01.conf
@@ -1,6 +1,9 @@
 # Run the game windowed
 gfx.windowed=false
 
+# rotate the normally-horizontal game window to be vertical
+gfx.vertical=false
+
 # URL (e.g. http://my.eamuse.server:80/whatever) or IPV4 (e.g. 127.0.0.1:80) of the target eamuse server. The port is optional but defaults to 80.
 eamuse.server=localhost:80
 
diff --git a/dist/jb/jbhook-02.conf b/dist/jb/jbhook-02.conf
index fdb476f..ed8c434 100644
--- a/dist/jb/jbhook-02.conf
+++ b/dist/jb/jbhook-02.conf
@@ -1,6 +1,9 @@
 # Run the game windowed
 gfx.windowed=false
 
+# rotate the normally-horizontal game window to be vertical
+gfx.vertical=false
+
 # URL (e.g. http://my.eamuse.server:80/whatever) or IPV4 (e.g. 127.0.0.1:80) of the target eamuse server. The port is optional but defaults to 80.
 eamuse.server=localhost:80
 
diff --git a/src/main/jbhook-util/gfx.c b/src/main/jbhook-util/gfx.c
index b0351ca..c55b1a6 100644
--- a/src/main/jbhook-util/gfx.c
+++ b/src/main/jbhook-util/gfx.c
@@ -146,8 +146,10 @@ static void fb_init(void) {
 
 static void __stdcall hook_glFlush(void) {
     // 3 bytes per RGB pixel
-    uint8_t pixels_raw[W*H*3];
-    uint8_t pixels_rot[W*H*3];
+    // these could really be stack variables but they are too big for gcc's
+    // default stack size, and it's no problem for 6MiB of data to hang around
+    static uint8_t pixels_raw[W*H*3];
+    static uint8_t pixels_rot[W*H*3];
 
     glReadPixels(0, 0, H, W, GL_RGB, GL_UNSIGNED_BYTE, pixels_raw);
 
@@ -185,7 +187,7 @@ static void __stdcall hook_glFlush(void) {
 // insufficiently generic compared to something in opengl32.dll, but the render
 // loop of the game makes it very difficult to "catch" the rendering at the
 // right place otherwise. This works with all horizontal jubeats, and they
-// stopped needing rotation past copious.
+// stopped needing rotation fixes starting with saucer.
 static void hook_glBindFramebufferEXT(GLenum target, GLuint framebuffer) {
     fb_init();
 
diff --git a/src/main/jbhook2/dllmain.c b/src/main/jbhook2/dllmain.c
index 75a74a9..69ca089 100644
--- a/src/main/jbhook2/dllmain.c
+++ b/src/main/jbhook2/dllmain.c
@@ -42,8 +42,6 @@ static struct options options;
 
 static bool my_dll_entry_init(char *sidcode, struct property_node *param)
 {
-    jbhook_util_gfx_install_vertical_hooks();
-
     bool eam_io_ok;
     bool jb_io_ok;
 
@@ -52,6 +50,10 @@ static bool my_dll_entry_init(char *sidcode, struct property_node *param)
 
     log_info("--- Begin jbhook dll_entry_init ---");
 
+    if(options.vertical) {
+        jbhook_util_gfx_install_vertical_hooks();
+    }
+
     if (!options.disable_p3ioemu) {
         log_assert(sidcode != NULL);
         // pcbid and eamid are only used here for sec check, the ones used for
@@ -157,9 +159,11 @@ static HWND CDECL my_mwindow_create(
     log_info("---------------- Begin jbhook mwindow_create ----------------");
     log_info("-------------------------------------------------------------");
 
-    DWORD tmp = window_width;
-    window_width = window_height;
-    window_height = tmp;
+    if(options.vertical) {
+        DWORD tmp = window_width;
+        window_width = window_height;
+        window_height = tmp;
+    }
 
     return real_mwindow_create(
         hinstance,
diff --git a/src/main/jbhook2/options.c b/src/main/jbhook2/options.c
index 4af7a6d..7b6959f 100644
--- a/src/main/jbhook2/options.c
+++ b/src/main/jbhook2/options.c
@@ -65,6 +65,11 @@ bool options_read_cmdline(struct options *options, int argc, const char **argv)
                 break;
             }
 
+            case 'v': {
+                options->vertical = true;
+                break;
+            }
+
             case 'a': {
                 options->disable_adapteremu = true;
                 break;
@@ -96,6 +101,7 @@ void options_print_usage(void)
                 "       -h                  Print this usage message\n"
                 "       -w                  Run the game windowed\n"
                 "       -f                  Run the game in a framed window (needs -w option)\n"
+                "       -v                  Rotate the normally-horizontal game window to be vertical\n"
                 "       -a                  Disable adapter hook\n"
                 "       -c                  Disable card emulation (e.g. when running on a "
                 "real cab)\n"
diff --git a/src/main/jbhook2/options.h b/src/main/jbhook2/options.h
index de4d259..01965c4 100644
--- a/src/main/jbhook2/options.h
+++ b/src/main/jbhook2/options.h
@@ -7,6 +7,7 @@
 struct options {
     bool windowed;
     bool window_framed;
+    bool vertical;
     bool disable_p3ioemu;
     bool disable_cardemu;
     bool disable_adapteremu;