diff --git a/src/emu/xtal.cpp b/src/emu/xtal.cpp
index ea41c44e609..951db7781cd 100644
--- a/src/emu/xtal.cpp
+++ b/src/emu/xtal.cpp
@@ -339,7 +339,7 @@ const double XTAL::known_xtals[] = {
 	 32'220'000, /* 32.22_MHz_XTAL         Typically used on 90's Data East PCBs (close to 9x NTSC subcarrier which is 32.215905Mhz */
 	 32'256'000, /* 32.256_MHz_XTAL        Hitachi MB-6890 */
 	 32'317'400, /* 32.3174_MHz_XTAL       DEC VT330, VT340 */
-	 32'530'400, /* 32.5304_MHz_XTAL       Seta 2 */
+	 32'530'470, /* 32.53047_MHz_XTAL      Seta 2 */
 	 33'000'000, /* 33_MHz_XTAL            Sega Model 3 video board */
 	 33'264'000, /* 33.264_MHz_XTAL        Hazeltine 1500 terminal */
 	 33'330'000, /* 33.33_MHz_XTAL         Sharp X68000 XVI */
diff --git a/src/mame/drivers/novag_const.cpp b/src/mame/drivers/novag_const.cpp
index 2bbbef44e2d..7aa93651d62 100644
--- a/src/mame/drivers/novag_const.cpp
+++ b/src/mame/drivers/novag_const.cpp
@@ -11,8 +11,9 @@ Hardware notes:
 - TTL, buzzer, 24 LEDs, 8*8 chessboard buttons
 
 TODO:
-- add 3.6MHz version: 7.2MHz XTAL, 65SC02 CPU, 1 maskrom(NOVAG-831A 6133-8316),
-  maybe 32KB? 1 RAM chip(TC5516AP) instead of silly daughterboard
+- add 3.6MHz version: 7.2MHz XTAL, 65SC02 CPU, 1 maskrom(NOVAG-831A 6133-8316) 16KB?
+  1 RAM chip(TC5516AP) instead of silly daughterboard
+- add Quattro version, another small update, this time 4MHz
 
 ******************************************************************************/
 
diff --git a/src/mame/drivers/seta2.cpp b/src/mame/drivers/seta2.cpp
index 50a15b6c1b7..7812f3ce599 100644
--- a/src/mame/drivers/seta2.cpp
+++ b/src/mame/drivers/seta2.cpp
@@ -2330,7 +2330,7 @@ void seta2_state::seta2(machine_config &config)
 void seta2_state::gundamex(machine_config &config)
 {
 	seta2(config);
-	m_maincpu->set_clock(XTAL(32'530'400)/2); // verified
+	m_maincpu->set_clock(XTAL(32'530'470)/2); // verified
 	m_maincpu->set_addrmap(AS_PROGRAM, &seta2_state::gundamex_map);
 
 	downcast<tmp68301_device &>(*m_maincpu).in_parallel_callback().set(FUNC(seta2_state::gundamex_eeprom_r));
@@ -2341,20 +2341,20 @@ void seta2_state::gundamex(machine_config &config)
 	// video hardware
 	m_screen->set_visarea(0x00, 0x180-1, 0x000, 0x0e0-1);
 
-	subdevice<x1_010_device>("x1snd")->set_clock(XTAL(32'530'400)/2); // verified; reference : https://youtu.be/6f-znVzcrmg
+	subdevice<x1_010_device>("x1snd")->set_clock(XTAL(32'530'470)/2); // verified; reference : https://youtu.be/6f-znVzcrmg
 }
 
 
 void seta2_state::grdians(machine_config &config)
 {
 	seta2(config);
-	m_maincpu->set_clock(XTAL(32'530'400)/2); // verified
+	m_maincpu->set_clock(XTAL(32'530'470)/2); // verified
 	m_maincpu->set_addrmap(AS_PROGRAM, &seta2_state::grdians_map);
 
 	// video hardware
 	m_screen->set_visarea(0x00, 0x130-1, 0x00, 0xe8 -1);
 
-	subdevice<x1_010_device>("x1snd")->set_clock(XTAL(32'530'400)/2); // verified; reference : https://youtu.be/Ung9XeLisV0
+	subdevice<x1_010_device>("x1snd")->set_clock(XTAL(32'530'470)/2); // verified; reference : https://youtu.be/Ung9XeLisV0
 }