diff --git a/src/mame/drivers/by17.cpp b/src/mame/drivers/by17.cpp
index 91d14b6c688..bb2d3e47f80 100644
--- a/src/mame/drivers/by17.cpp
+++ b/src/mame/drivers/by17.cpp
@@ -986,6 +986,20 @@ void by17_state::machine_start()
 	m_lamps.resolve();
 	m_digits.resolve();
 	m_solenoids.resolve();
+
+	save_item(NAME(m_u10a));
+	save_item(NAME(m_u10b));
+	save_item(NAME(m_u11a));
+	save_item(NAME(m_u11b));
+	save_item(NAME(m_u10_ca2));
+	save_item(NAME(m_u10_cb1));
+	save_item(NAME(m_u10_cb2));
+	save_item(NAME(m_u11_ca1));
+	save_item(NAME(m_u11_cb2));
+	save_item(NAME(m_segment));
+	save_item(NAME(m_lamp_decode));
+	save_item(NAME(m_solenoid_features));
+	save_item(NAME(m_io_hold_x));
 }
 
 void by17_state::machine_reset()
diff --git a/src/mame/drivers/by35.cpp b/src/mame/drivers/by35.cpp
index 2317ccdda33..fe9e307526c 100644
--- a/src/mame/drivers/by35.cpp
+++ b/src/mame/drivers/by35.cpp
@@ -1492,6 +1492,20 @@ void by35_state::machine_start()
 	m_solenoids.resolve();
 	m_sound_select_handler.resolve();
 	m_sound_int_handler.resolve();
+
+	save_item(NAME(m_u10a));
+	save_item(NAME(m_u10b));
+	save_item(NAME(m_u11a));
+	save_item(NAME(m_u11b));
+	save_item(NAME(m_u10_ca2));
+	save_item(NAME(m_u10_cb1));
+	save_item(NAME(m_u10_cb2));
+	save_item(NAME(m_u11_ca1));
+	save_item(NAME(m_u11_cb2));
+	save_item(NAME(m_7d));
+	save_item(NAME(m_segment));
+	save_item(NAME(m_lamp_decode));
+	save_item(NAME(m_io_hold_x));
 }
 
 void by35_state::machine_reset()
diff --git a/src/mame/drivers/byvid.cpp b/src/mame/drivers/byvid.cpp
index 8740375e7bb..ef556d3f1bf 100644
--- a/src/mame/drivers/byvid.cpp
+++ b/src/mame/drivers/byvid.cpp
@@ -99,7 +99,6 @@ public:
 	DECLARE_INPUT_CHANGED_MEMBER(self_test);
 
 	void by133(machine_config &config);
-	void babypac(machine_config &config);
 	void granny(machine_config &config);
 
 private:
diff --git a/src/mame/drivers/zac_2.cpp b/src/mame/drivers/zac_2.cpp
index 0c70c7ab3de..bb9268710fa 100644
--- a/src/mame/drivers/zac_2.cpp
+++ b/src/mame/drivers/zac_2.cpp
@@ -51,7 +51,7 @@ private:
 	uint8_t m_t_c = 0U;
 	uint8_t m_out_offs = 0U;
 	virtual void machine_reset() override;
-	virtual void machine_start() override { m_digits.resolve(); }
+	virtual void machine_start() override;
 	required_device<s2650_device> m_maincpu;
 	required_shared_ptr<uint8_t> m_p_ram;
 	required_ioport_array<8> m_io_keyboard;
@@ -198,6 +198,15 @@ WRITE_LINE_MEMBER( zac_2_state::serial_w )
 // to printer
 }
 
+void zac_2_state::machine_start()
+{
+	m_digits.resolve();
+
+	save_item(NAME(m_row));
+	save_item(NAME(m_t_c));
+	save_item(NAME(m_out_offs));
+}
+
 void zac_2_state::machine_reset()
 {
 	m_t_c = 0;