diff --git a/hash/sms.xml b/hash/sms.xml
index 80d88195eee..03d0930f9f7 100644
--- a/hash/sms.xml
+++ b/hash/sms.xml
@@ -699,6 +699,7 @@
 		</part>
 	</software>
 
+	<!-- Notes: FM support -->
 	<software name="aliensynp" cloneof="aliensyn">
 		<description>Alien Syndrome (Prototype)</description>
 		<year>1987</year>
@@ -1108,6 +1109,7 @@
 		</part>
 	</software>
 
+	<!-- Notes: FM support -->
 	<software name="borgmanp" cloneof="cyborgh">
 		<description>Chouon Senshi Borgman (Jpn, Prototype)</description>
 		<year>1988</year>
@@ -3000,6 +3002,7 @@
 		</part>
 	</software>
 
+	<!-- Notes: FM support -->
 	<software name="greatglfp" cloneof="greatglf">
 		<description>Great Golf (Prototype)</description>
 		<year>1987</year>
@@ -3895,6 +3898,7 @@
 		</part>
 	</software>
 
+	<!-- Notes: FM support -->
 	<software name="maougolvp" cloneof="golvell">
 		<description>Maou Golvellius (Jpn, Prototype)</description>
 		<year>1988</year>
@@ -4345,6 +4349,7 @@
 		</part>
 	</software>
 
+	<!-- Notes: FM support -->
 	<software name="supgolf" cloneof="golfaman">
 		<description>Super Golf (Prototype)</description>
 		<year>1989</year>
@@ -6336,6 +6341,7 @@
 		</part>
 	</software>
 
+	<!-- Notes: FM support -->
 	<software name="sumgamesp" cloneof="sumgames">
 		<description>Summer Games (Euro, Prototype)</description>
 		<year>1991</year>
@@ -7420,10 +7426,12 @@
 		</part>
 	</software>
 
+	<!-- Notes: FM support, video code relies on the tilemap mirroring bug of the 315-5124 VDP -->
 	<software name="ysd" cloneof="ys">
 		<description>Ys (USA, Demo)</description>
 		<year>1988</year>
 		<publisher>Sega</publisher>
+		<info name="usage" value="Video only works correctly on drivers with SMS1 VDP, e.g. smsj" />
 		<part name="cart" interface="sms_cart">
 			<dataarea name="rom" size="262144">
 				<rom name="ys - the vanished omens [demo].bin" size="262144" crc="e8b82066" sha1="b70757876e4ff592692eb0ee1c51c571b31541a9" offset="000000" />
diff --git a/src/devices/bus/sega8/mgear.cpp b/src/devices/bus/sega8/mgear.cpp
index 83835925198..e715d0b1652 100644
--- a/src/devices/bus/sega8/mgear.cpp
+++ b/src/devices/bus/sega8/mgear.cpp
@@ -4,13 +4,13 @@
 
  Master Gear Converter emulation
 
- ***********************************************************************************************************/
+ The Master Gear Converter, also known as Master Gear, Gear Master Converter
+ or (in Brazil) as Master Gear Adaptor, allows to plug western SMS cartridges
+ on the Game Gear, by enabling the SMS compatibility mode on the Game Gear
+ cartridge slot. Some SMS games have compatibility issues, confirmed on the
+ real hardware, when run on the Game Gear.
 
-// The Master Gear Converter, also known as Master Gear, Gear Master Converter
-// or (in Brazil) as Master Gear Adaptor, allows to plug western SMS cartridges
-// on the Game Gear, by enabling the SMS compatibility mode on the Game Gear
-// cartridge slot. Some SMS games have compatibility issues, confirmed on the
-// real hardware, when run on the Game Gear.
+ ***********************************************************************************************************/
 
 
 #include "emu.h"
diff --git a/src/devices/bus/sms_ctrl/paddle.cpp b/src/devices/bus/sms_ctrl/paddle.cpp
index ec5acd4a5ee..f502b9ad196 100644
--- a/src/devices/bus/sms_ctrl/paddle.cpp
+++ b/src/devices/bus/sms_ctrl/paddle.cpp
@@ -33,8 +33,9 @@ Notes:
 
 const device_type SMS_PADDLE = &device_creator<sms_paddle_device>;
 
-
-#define PADDLE_INTERVAL attotime::from_hz(XTAL_53_693175MHz/15/256)
+// time interval not verified
+// Player 2 of Galactic Protector is the most sensible to this timming.
+#define PADDLE_INTERVAL attotime::from_hz(XTAL_53_693175MHz/15/100)
 
 
 CUSTOM_INPUT_MEMBER( sms_paddle_device::dir_pins_r )
diff --git a/src/devices/bus/sms_ctrl/sportsjp.cpp b/src/devices/bus/sms_ctrl/sportsjp.cpp
index ca2c3de1748..fef04df69e8 100644
--- a/src/devices/bus/sms_ctrl/sportsjp.cpp
+++ b/src/devices/bus/sms_ctrl/sportsjp.cpp
@@ -34,8 +34,9 @@ Notes:
 
 const device_type SMS_SPORTS_PAD_JP = &device_creator<sms_sports_pad_jp_device>;
 
+// time interval not verified
+#define SPORTS_PAD_JP_INTERVAL attotime::from_hz(20000)
 
-#define SPORTS_PAD_JP_INTERVAL attotime::from_hz(30000) // 30Hz (not measured)
 
 
 DECLARE_CUSTOM_INPUT_MEMBER( sms_sports_pad_jp_device::dir_pins_r )