diff --git a/src/mess/drivers/rainbow.c b/src/mess/drivers/rainbow.c
index 5dc2d4e1afa..4f6fe9b35e6 100644
--- a/src/mess/drivers/rainbow.c
+++ b/src/mess/drivers/rainbow.c
@@ -1213,7 +1213,7 @@ static MACHINE_CONFIG_START( rainbow, rainbow_state )
 	MCFG_SCREEN_PALETTE("vt100_video:palette")
 	MCFG_GFXDECODE_ADD("gfxdecode", rainbow)
 	
-	MCFG_RAINBOW_VIDEO_ADD("vt100_video", video_interface)
+	MCFG_RAINBOW_VIDEO_ADD("vt100_video", "screen", video_interface)
 
 	MCFG_FD1793_ADD("wd1793", rainbow_wd17xx_interface )
 	MCFG_LEGACY_FLOPPY_4_DRIVES_ADD(floppy_intf)
diff --git a/src/mess/drivers/vt100.c b/src/mess/drivers/vt100.c
index a9474fd91b2..a7d9b0ff595 100644
--- a/src/mess/drivers/vt100.c
+++ b/src/mess/drivers/vt100.c
@@ -427,7 +427,7 @@ static MACHINE_CONFIG_START( vt100, vt100_state )
 
 	MCFG_DEFAULT_LAYOUT( layout_vt100 )
 
-	MCFG_VT100_VIDEO_ADD("vt100_video", vt100_video_interface)
+	MCFG_VT100_VIDEO_ADD("vt100_video", "screen", vt100_video_interface)
 
 	MCFG_DEVICE_ADD("i8251", I8251, 0)
 	MCFG_I8251_TXD_HANDLER(DEVWRITELINE(RS232_TAG, rs232_port_device, write_txd))
diff --git a/src/mess/video/vtvideo.h b/src/mess/video/vtvideo.h
index 22f76c633a8..c69c396d5bb 100644
--- a/src/mess/video/vtvideo.h
+++ b/src/mess/video/vtvideo.h
@@ -101,13 +101,16 @@ extern const device_type VT100_VIDEO;
 extern const device_type RAINBOW_VIDEO;
 
 
-#define MCFG_VT100_VIDEO_ADD(_tag, _intrf) \
+#define MCFG_VT100_VIDEO_ADD(_tag, _screen_tag, _intrf) \
 	MCFG_DEVICE_ADD(_tag, VT100_VIDEO, 0) \
-	MCFG_DEVICE_CONFIG(_intrf)
+	MCFG_DEVICE_CONFIG(_intrf) \
+	MCFG_VIDEO_SET_SCREEN(_screen_tag)
 
-#define MCFG_RAINBOW_VIDEO_ADD(_tag, _intrf) \
+#define MCFG_RAINBOW_VIDEO_ADD(_tag, _screen_tag, _intrf) \
 	MCFG_DEVICE_ADD(_tag, RAINBOW_VIDEO, 0) \
-	MCFG_DEVICE_CONFIG(_intrf)
+	MCFG_DEVICE_CONFIG(_intrf) \
+	MCFG_VIDEO_SET_SCREEN(_screen_tag)
+	
 
 
 #endif