diff --git a/src/mame/drivers/galaga.cpp b/src/mame/drivers/galaga.cpp
index e9b9f9bb531..1e4e1321529 100644
--- a/src/mame/drivers/galaga.cpp
+++ b/src/mame/drivers/galaga.cpp
@@ -673,13 +673,6 @@ Notes:
 TODO:
 ----
 
-- bosco: is the scrolling tilemap placement correct? It is currently aligned so that
-  the test grid shown on startup is correct, but this way an unerased grey strip
-  remains on the left of the screen during the title sequence. Alignment of the
-  bullets/radar blips is also mysterious. Currently the radar blips are perfectly
-  aligned with the radar, but the alignment of the player bullets with the player
-  ship differs by one horizontal pixel when the screen is flipped.
-
 - gallag/gatsbee: explosions are not emulated since the bootleg board doesn't have
   the 54XX custom. Should probably use samples like Battles?
 
@@ -3493,11 +3486,11 @@ void battles_state::driver_init()
 /* Original Namco hardware, with Namco Customs */
 
 //    YEAR, NAME,      PARENT,  MACHINE, INPUT,    STATE,         INIT,         MONITOR,COMPANY,FULLNAME,FLAGS
-GAME( 1981, bosco,     0,       bosco,   bosco,    bosco_state,   empty_init,   ROT0,   "Namco", "Bosconian (new version)", MACHINE_SUPPORTS_SAVE | MACHINE_IMPERFECT_GRAPHICS )
-GAME( 1981, boscoo,    bosco,   bosco,   bosco,    bosco_state,   empty_init,   ROT0,   "Namco", "Bosconian (old version)", MACHINE_SUPPORTS_SAVE | MACHINE_IMPERFECT_GRAPHICS )
-GAME( 1981, boscoo2,   bosco,   bosco,   bosco,    bosco_state,   empty_init,   ROT0,   "Namco", "Bosconian (older version)", MACHINE_SUPPORTS_SAVE | MACHINE_IMPERFECT_GRAPHICS )
-GAME( 1981, boscomd,   bosco,   bosco,   boscomd,  bosco_state,   empty_init,   ROT0,   "Namco (Midway license)", "Bosconian (Midway, new version)", MACHINE_SUPPORTS_SAVE | MACHINE_IMPERFECT_GRAPHICS )
-GAME( 1981, boscomdo,  bosco,   bosco,   boscomd,  bosco_state,   empty_init,   ROT0,   "Namco (Midway license)", "Bosconian (Midway, old version)", MACHINE_SUPPORTS_SAVE | MACHINE_IMPERFECT_GRAPHICS )
+GAME( 1981, bosco,     0,       bosco,   bosco,    bosco_state,   empty_init,   ROT0,   "Namco", "Bosconian (new version)", MACHINE_SUPPORTS_SAVE )
+GAME( 1981, boscoo,    bosco,   bosco,   bosco,    bosco_state,   empty_init,   ROT0,   "Namco", "Bosconian (old version)", MACHINE_SUPPORTS_SAVE )
+GAME( 1981, boscoo2,   bosco,   bosco,   bosco,    bosco_state,   empty_init,   ROT0,   "Namco", "Bosconian (older version)", MACHINE_SUPPORTS_SAVE )
+GAME( 1981, boscomd,   bosco,   bosco,   boscomd,  bosco_state,   empty_init,   ROT0,   "Namco (Midway license)", "Bosconian (Midway, new version)", MACHINE_SUPPORTS_SAVE )
+GAME( 1981, boscomdo,  bosco,   bosco,   boscomd,  bosco_state,   empty_init,   ROT0,   "Namco (Midway license)", "Bosconian (Midway, old version)", MACHINE_SUPPORTS_SAVE )
 
 GAME( 1981, galaga,    0,       galaga,  galaga,   galaga_state,  init_galaga,  ROT90,  "Namco", "Galaga (Namco rev. B)", MACHINE_SUPPORTS_SAVE )
 GAME( 1981, galagao,   galaga,  galaga,  galaga,   galaga_state,  init_galaga,  ROT90,  "Namco", "Galaga (Namco)", MACHINE_SUPPORTS_SAVE )
diff --git a/src/mame/video/bosco.cpp b/src/mame/video/bosco.cpp
index d8eca509011..c86e76ed1a9 100644
--- a/src/mame/video/bosco.cpp
+++ b/src/mame/video/bosco.cpp
@@ -123,8 +123,6 @@ VIDEO_START_MEMBER(bosco_state,bosco)
 	m_bg_tilemap->configure_groups(*m_gfxdecode->gfx(0), 0x1f);
 	m_fg_tilemap->configure_groups(*m_gfxdecode->gfx(0), 0x1f);
 
-	m_bg_tilemap->set_scrolldx(3,3);
-
 	m_spriteram = m_videoram + 0x03d4;
 	m_spriteram_size = 0x0c;
 	m_spriteram2 = m_spriteram + 0x0800;
@@ -185,13 +183,13 @@ void bosco_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect,
 
 	for (offs = 0;offs < m_spriteram_size;offs += 2)
 	{
-		int sx = spriteram[offs + 1] - 1;
+		int sx = spriteram[offs + 1] - 2;
 		int sy = 240 - spriteram_2[offs];
 		int flipx = spriteram[offs] & 1;
 		int flipy = spriteram[offs] & 2;
 		int color = spriteram_2[offs + 1] & 0x3f;
 
-		if (flip) sx += 32-2;
+		if (flip) sx += 32-1;
 
 		m_gfxdecode->gfx(1)->transmask(bitmap,cliprect,
 				(spriteram[offs] & 0xfc) >> 2,
@@ -246,13 +244,16 @@ uint32_t bosco_state::screen_update_bosco(screen_device &screen, bitmap_ind16 &b
 		fg_clip.min_x = 28*8;
 	}
 
+	bg_clip &= cliprect;
+	fg_clip &= cliprect;
+
 	bitmap.fill(m_palette->black_pen(), cliprect);
-	m_starfield->draw_starfield(bitmap,cliprect,flip);
+	m_starfield->draw_starfield(bitmap,bg_clip,flip);
 
 	m_bg_tilemap->draw(screen, bitmap, bg_clip, 0,0);
 	m_fg_tilemap->draw(screen, bitmap, fg_clip, 0,0);
 
-	draw_sprites(bitmap,cliprect,flip);
+	draw_sprites(bitmap,bg_clip,flip);
 
 	/* draw the high priority characters */
 	m_bg_tilemap->draw(screen, bitmap, bg_clip, 1,0);
@@ -260,6 +261,28 @@ uint32_t bosco_state::screen_update_bosco(screen_device &screen, bitmap_ind16 &b
 
 	draw_bullets(bitmap,cliprect,flip);
 
+	/* It looks like H offsets 221-223 are skipped over, moving the radar tilemap
+	   (including the 'bullets' on it) 3 pixels to the left */
+	for (int y = cliprect.min_y; y <= cliprect.max_y; y++)
+	{
+		if (flip)
+		{
+			for (int x = 63; x >= 0; x--)
+			{
+				bitmap.pix16(y, x + 3) = bitmap.pix16(y, x);
+				bitmap.pix16(y, x) = m_palette->black_pen();
+			}
+		}
+		else
+		{
+			for (int x = 224; x < 288; x++)
+			{
+				bitmap.pix16(y, x - 3) = bitmap.pix16(y, x);
+				bitmap.pix16(y, x) = m_palette->black_pen();
+			}
+		}
+	}
+
 	return 0;
 }