diff --git a/src/device/mouse.c b/src/device/mouse.c
index 193149bc8b..da4ed1c04e 100644
--- a/src/device/mouse.c
+++ b/src/device/mouse.c
@@ -454,6 +454,15 @@ mouse_scale(int x, int y)
     mouse_scale_y(y);
 }
 
+void
+mouse_scale_axis(int axis, int val)
+{
+    if (axis == 1)
+        mouse_scale_y(val);
+    else if (axis == 0)
+        mouse_scale_x(val);
+}
+
 void
 mouse_set_z(int z)
 {
diff --git a/src/include/86box/mouse.h b/src/include/86box/mouse.h
index 3ed6b2126e..786b86f410 100644
--- a/src/include/86box/mouse.h
+++ b/src/include/86box/mouse.h
@@ -93,6 +93,7 @@ extern void            mouse_scale_x(int x);
 extern void            mouse_scale_y(int y);
 extern void            mouse_scalef(double x, double y);
 extern void            mouse_scale(int x, int y);
+extern void            mouse_scale_axis(int axis, int val);
 extern void            mouse_set_z(int z);
 extern void            mouse_clear_z(void);
 extern void            mouse_subtract_z(int *delta_z, int min, int max, int invert);
diff --git a/src/video/vid_8514a.c b/src/video/vid_8514a.c
index bb61e3c472..9f2b1316a1 100644
--- a/src/video/vid_8514a.c
+++ b/src/video/vid_8514a.c
@@ -4367,7 +4367,6 @@ ibm8514_init(const device_t *info)
 
     svga_t    *svga  = svga_get_pri();
     ibm8514_t *dev   = (ibm8514_t *) calloc(1, sizeof(ibm8514_t));
-    mach_t    *mach  = NULL;
 
     svga->dev8514    = dev;
     svga->ext8514    = NULL;
diff --git a/src/video/vid_ati_mach8.c b/src/video/vid_ati_mach8.c
index fb07d15480..d710b2bcf3 100644
--- a/src/video/vid_ati_mach8.c
+++ b/src/video/vid_ati_mach8.c
@@ -59,15 +59,7 @@ static uint8_t  mach_accel_inb(uint16_t port, void *priv);
 static uint16_t mach_accel_inw(uint16_t port, void *priv);
 static uint8_t  mach_in(uint16_t addr, void *priv);
 
-static void     ati8514_accel_outb(uint16_t port, uint8_t val, void *priv);
-static void     ati8514_accel_outw(uint16_t port, uint16_t val, void *priv);
-static void     ati8514_accel_outl(uint16_t port, uint32_t val, void *priv);
-static uint8_t  ati8514_accel_inb(uint16_t port, void *priv);
-static uint16_t ati8514_accel_inw(uint16_t port, void *priv);
-static uint32_t ati8514_accel_inl(uint16_t port, void *priv);
-
-
-static void mach32_updatemapping(mach_t *mach, svga_t *svga);
+static void     mach32_updatemapping(mach_t *mach, svga_t *svga);
 
 #ifdef ENABLE_MACH_LOG
 int mach_do_log = ENABLE_MACH_LOG;
@@ -3990,7 +3982,6 @@ static void
 mach_accel_out(uint16_t port, uint8_t val, mach_t *mach)
 {
     svga_t    *svga = &mach->svga;
-    ibm8514_t *dev  = (ibm8514_t *) svga->dev8514;
 
     mach_log("[%04X:%08X]: Port NORMAL OUT=%04x, val=%04x.\n", CS, cpu_state.pc, port, val);
 
diff --git a/src/video/vid_xga.c b/src/video/vid_xga.c
index 822bb3b6da..44e8aa6c3a 100644
--- a/src/video/vid_xga.c
+++ b/src/video/vid_xga.c
@@ -1254,7 +1254,7 @@ xga_line_draw_write(svga_t *svga)
     xga_t   *xga = (xga_t *) svga->xga;
     uint32_t src_dat;
     uint32_t dest_dat;
-    uint32_t old_dest_dat;
+    uint32_t old_dest_dat = 0x00000000;
     uint32_t color_cmp  = xga->accel.color_cmp;
     uint32_t plane_mask = xga->accel.plane_mask;
     uint32_t dstbase    = xga->accel.px_map_base[xga->accel.dst_map];