diff --git a/src/devices/machine/ticket.cpp b/src/devices/machine/ticket.cpp
index 8e285efff5d..e8cd2d419b6 100644
--- a/src/devices/machine/ticket.cpp
+++ b/src/devices/machine/ticket.cpp
@@ -30,7 +30,7 @@ DEFINE_DEVICE_TYPE(HOPPER, hopper_device, "coin_hopper", "Coin Hopper")
 //**************************************************************************
 
 //-------------------------------------------------
-//  ticket_dispenser_device - constructor
+//  constructor
 //-------------------------------------------------
 
 ticket_dispenser_device::ticket_dispenser_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock)
@@ -58,6 +58,16 @@ hopper_device::hopper_device(const machine_config &mconfig, const char *tag, dev
 }
 
 
+//-------------------------------------------------
+//  destructor
+//-------------------------------------------------
+
+ticket_dispenser_device::~ticket_dispenser_device()
+{
+}
+
+
+
 //**************************************************************************
 //  READ/WRITE HANDLERS
 //**************************************************************************
diff --git a/src/devices/machine/ticket.h b/src/devices/machine/ticket.h
index d9afe4e4d39..350baf7c4be 100644
--- a/src/devices/machine/ticket.h
+++ b/src/devices/machine/ticket.h
@@ -37,6 +37,7 @@ public:
 		set_period(period);
 	}
 	ticket_dispenser_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
+	virtual ~ticket_dispenser_device();
 
 	// inline configuration helpers
 	void set_period(const attotime &period) { m_period = period; }
diff --git a/src/mame/saitek/minichess.cpp b/src/mame/saitek/minichess.cpp
index ab4ebf609db..248b9cf80d6 100644
--- a/src/mame/saitek/minichess.cpp
+++ b/src/mame/saitek/minichess.cpp
@@ -9,7 +9,7 @@ It's the first chess program on HMCS40. The engine was written by Mark Taylor
 with assistance from David Levy.
 
 Hardware notes:
-- Hitachi 44801A34 MCU @ ~500kHz
+- Hitachi 44801A34 MCU @ ~400kHz
 - 4-digit LCD screen
 
 Excluding resellers with same title, this MCU was used in:
@@ -19,6 +19,10 @@ Excluding resellers with same title, this MCU was used in:
 - SciSys Chess Partner 3000
 - SciSys Chess Partner 4000
 
+MCU clock is via a resistor, this less accurate than with an XTAL, so the speed
+may vary. Graduate Chess appears to have a 62K resistor between the OSC pins,
+which would make it around 500kHz?
+
 On CP3000/4000 they added a level slider. This will oscillate the level switch
 input pin, so the highest level setting is the same as level 2 on Mini Chess.
 It works on the old A34 MCU because the game keeps reading D0 while computing.
@@ -182,7 +186,7 @@ INPUT_PORTS_END
 void mini_state::smchess(machine_config &config)
 {
 	// basic machine hardware
-	HD44801(config, m_maincpu, 500'000); // approximation, R=62K
+	HD44801(config, m_maincpu, 400'000); // approximation
 	m_maincpu->write_r<2>().set(FUNC(mini_state::seg_w<0>));
 	m_maincpu->write_r<3>().set(FUNC(mini_state::seg_w<1>));
 	m_maincpu->write_d().set(FUNC(mini_state::mux_w));
diff --git a/src/mame/saitek/tschess.cpp b/src/mame/saitek/tschess.cpp
index 71565e7945f..f8bbec484af 100644
--- a/src/mame/saitek/tschess.cpp
+++ b/src/mame/saitek/tschess.cpp
@@ -11,7 +11,7 @@ Computachess (see cxg/computachess.cpp).
 
 Hardware notes:
 - PCB label: SCISYS TC-A, 201148
-- Hitachi 44801A85 MCU @ ~350kHz
+- Hitachi 44801A85 MCU @ ~400kHz (R=91K) or ~350Hz (R=150K)
 - piezo, 21 leds, button sensors chessboard
 
 44801A85 MCU is used in:
@@ -157,7 +157,7 @@ INPUT_PORTS_END
 void tschess_state::tschess(machine_config &config)
 {
 	// basic machine hardware
-	HD44801(config, m_maincpu, 350'000); // approximation, R=150K
+	HD44801(config, m_maincpu, 400'000); // approximation
 	m_maincpu->write_r<2>().set(FUNC(tschess_state::mux_w<0>));
 	m_maincpu->write_r<3>().set(FUNC(tschess_state::mux_w<1>));
 	m_maincpu->write_d().set(FUNC(tschess_state::control_w));