diff --git a/src/mame/drivers/raiden.c b/src/mame/drivers/raiden.c
index 79ca58d73db..ae4edc6da99 100644
--- a/src/mame/drivers/raiden.c
+++ b/src/mame/drivers/raiden.c
@@ -54,6 +54,7 @@
 #include "sound/3812intf.h"
 #include "sound/okim6295.h"
 #include "includes/raiden.h"
+#include "video/seibu_crtc.h"
 
 
 /******************************************************************************/
@@ -125,9 +126,7 @@ static ADDRESS_MAP_START( raidenb_main_map, AS_PROGRAM, 16, raiden_state )
 	AM_RANGE(0x0b006, 0x0b007) AM_WRITE8(raidenb_control_w, 0x00ff)
 	AM_RANGE(0x0c000, 0x0c7ff) AM_WRITE(raiden_text_w) AM_SHARE("videoram")
 	AM_RANGE(0x0d000, 0x0d00d) AM_READWRITE_LEGACY(seibu_main_word_r, seibu_main_word_w)
-	AM_RANGE(0x0d05c, 0x0d05d) AM_WRITE8(raidenb_layer_enable_w, 0x00ff)
-	AM_RANGE(0x0d060, 0x0d067) AM_WRITEONLY AM_SHARE("scroll_ram")
-	AM_RANGE(0x0d040, 0x0d08f) AM_WRITENOP // sei_crtc is here
+	AM_RANGE(0x0d040, 0x0d08f) AM_DEVREADWRITE("crtc", seibu_crtc_device, read, write)
 	AM_RANGE(0xa0000, 0xfffff) AM_ROM
 ADDRESS_MAP_END
 
@@ -311,15 +310,29 @@ static MACHINE_CONFIG_DERIVED( raidenu, raiden )
 	MCFG_CPU_PROGRAM_MAP(raidenu_sub_map)
 MACHINE_CONFIG_END
 
+WRITE16_MEMBER( raiden_state::raidenb_layer_scroll_w )
+{
+	COMBINE_DATA(&m_raidenb_scroll_ram[offset]);
+}
+
+SEIBU_CRTC_INTERFACE(crtc_intf)
+{
+	"screen",
+	DEVCB_DRIVER_MEMBER16(raiden_state, raidenb_layer_enable_w),
+	DEVCB_DRIVER_MEMBER16(raiden_state, raidenb_layer_scroll_w),
+};
+
 static MACHINE_CONFIG_DERIVED( raidenb, raiden )
 
 	/* basic machine hardware */
 	MCFG_CPU_MODIFY("maincpu")
 	MCFG_CPU_PROGRAM_MAP(raidenb_main_map)
-	
+
 	/* video hardware */
 	MCFG_VIDEO_START_OVERRIDE(raiden_state,raidenb)
 
+	MCFG_SEIBU_CRTC_ADD("crtc",crtc_intf,0)
+
 	MCFG_SCREEN_MODIFY("screen")
 	MCFG_SCREEN_UPDATE_DRIVER(raiden_state, screen_update_raidenb)
 MACHINE_CONFIG_END
@@ -635,5 +648,5 @@ GAME( 1990, raidenk,  raiden, raiden,  raiden, raiden_state,  raidenk, ROT270, "
 /* Alternate hardware; SEI8904 + SEI9008 PCBs. Main & Sub CPU code not encrypted */
 GAME( 1990, raidenua, raiden, raidenu, raiden, raiden_state,  raidenu, ROT270, "Seibu Kaihatsu (Fabtek license)", "Raiden (US set 2)", 0 )
 
-/* Alternate hardware. Main, Sub & Sound CPU code not encrypted - could possibly be a bootleg?? */
+/* Alternate hardware. Main, Sub & Sound CPU code not encrypted - could possibly be a bootleg?? It also sports Seibu custom CRTC. */
 GAME( 1990, raidenb,  raiden, raidenb, raiden, driver_device, 0,       ROT270, "Seibu Kaihatsu", "Raiden (set 3)", 0 )
diff --git a/src/mame/includes/raiden.h b/src/mame/includes/raiden.h
index 7033456e9e4..0b5ef8ac83f 100644
--- a/src/mame/includes/raiden.h
+++ b/src/mame/includes/raiden.h
@@ -24,7 +24,7 @@ public:
 	required_device<buffered_spriteram16_device> m_spriteram;
 	required_shared_ptr<UINT16> m_shared_ram;
 	required_shared_ptr<UINT16> m_videoram;
-	required_shared_ptr<UINT16> m_scroll_ram;
+	optional_shared_ptr<UINT16> m_scroll_ram;
 	required_shared_ptr<UINT16> m_back_data;
 	required_shared_ptr<UINT16> m_fore_data;
 
@@ -36,13 +36,15 @@ public:
 	UINT8 m_tx_layer_enabled;
 	UINT8 m_sp_layer_enabled;
 	UINT8 m_flipscreen;
+	UINT16 m_raidenb_scroll_ram[6];
 
 	DECLARE_WRITE16_MEMBER(raiden_background_w);
 	DECLARE_WRITE16_MEMBER(raiden_foreground_w);
 	DECLARE_WRITE16_MEMBER(raiden_text_w);
 	DECLARE_WRITE8_MEMBER(raiden_control_w);
 	DECLARE_WRITE8_MEMBER(raidenb_control_w);
-	DECLARE_WRITE8_MEMBER(raidenb_layer_enable_w);
+	DECLARE_WRITE16_MEMBER(raidenb_layer_enable_w);
+	DECLARE_WRITE16_MEMBER(raidenb_layer_scroll_w);
 	DECLARE_DRIVER_INIT(raidenu);
 	DECLARE_DRIVER_INIT(raidenk);
 	DECLARE_DRIVER_INIT(raiden);
diff --git a/src/mame/video/raiden.c b/src/mame/video/raiden.c
index cee5ecd5082..976820d7494 100644
--- a/src/mame/video/raiden.c
+++ b/src/mame/video/raiden.c
@@ -1,7 +1,7 @@
 /*******************************************************************************
 
     Seibu Raiden hardware
-    
+
     Functions to emulate the video hardware
 
 *******************************************************************************/
@@ -62,7 +62,7 @@ WRITE8_MEMBER(raiden_state::raidenb_control_w)
 	machine().tilemap().set_flip_all(m_flipscreen ? (TILEMAP_FLIPY | TILEMAP_FLIPX) : 0);
 }
 
-WRITE8_MEMBER(raiden_state::raidenb_layer_enable_w)
+WRITE16_MEMBER(raiden_state::raidenb_layer_enable_w)
 {
 	// d0: back layer disable
 	// d1: fore layer disable
@@ -80,7 +80,7 @@ void raiden_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect,
 {
 	if (!m_sp_layer_enabled)
 		return;
-	
+
 	UINT16 *sprites = m_spriteram->buffer();
 	gfx_element *gfx = machine().gfx[3];
 
@@ -107,10 +107,10 @@ void raiden_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect,
 
 			Word #3 unused
 		*/
-		
+
 		if (!(sprites[offs + 0] & 0x8000))
 			continue;
-		
+
 		int priority = sprites[offs + 2] >> 14 & 0x3;
 		if ((priority & pri_mask) == 0)
 			continue;
@@ -181,13 +181,13 @@ UINT32 raiden_state::screen_update_raiden(screen_device &screen, bitmap_ind16 &b
 	scrollregs[1] = ((m_scroll_ram[0x01] & 0xf0) << 4) | ((m_scroll_ram[0x02] & 0x7f) << 1) | ((m_scroll_ram[0x02] & 0x80) >> 7);
 	scrollregs[2] = ((m_scroll_ram[0x19] & 0xf0) << 4) | ((m_scroll_ram[0x1a] & 0x7f) << 1) | ((m_scroll_ram[0x1a] & 0x80) >> 7);
 	scrollregs[3] = ((m_scroll_ram[0x11] & 0xf0) << 4) | ((m_scroll_ram[0x12] & 0x7f) << 1) | ((m_scroll_ram[0x12] & 0x80) >> 7);
-	
+
 	return screen_update_common(screen, bitmap, cliprect, scrollregs);
 }
 
 UINT32 raiden_state::screen_update_raidenb(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
 {
-	return screen_update_common(screen, bitmap, cliprect, m_scroll_ram);
+	return screen_update_common(screen, bitmap, cliprect, m_raidenb_scroll_ram);
 }