diff --git a/src/devices/cpu/ns32000/common.h b/src/devices/cpu/ns32000/common.h
index fa978729b49..8a17ca96294 100644
--- a/src/devices/cpu/ns32000/common.h
+++ b/src/devices/cpu/ns32000/common.h
@@ -35,11 +35,10 @@ namespace ns32000
 class ns32000_slave_interface : public device_interface
 {
 public:
-	auto out_scb() { return m_out_scb.bind(); }
+	auto out_spc() { return m_out_spc.bind(); }
 
 	ns32000_slave_interface(machine_config const &mconfig, device_t &device)
-		: device_interface(device, "ns32000_slave")
-		, m_out_scb(*this)
+		: ns32000_slave_interface(mconfig, device, "ns32000_slave")
 	{
 	}
 
@@ -68,11 +67,11 @@ public:
 protected:
 	ns32000_slave_interface(machine_config const &mconfig, device_t &device, char const *type)
 		: device_interface(device, type)
-		, m_out_scb(*this)
+		, m_out_spc(*this)
 	{
 	}
 
-	devcb_write_line m_out_scb;
+	devcb_write_line m_out_spc;
 };
 
 class ns32000_fpu_interface : public ns32000_slave_interface
diff --git a/src/devices/machine/ns32081.cpp b/src/devices/machine/ns32081.cpp
index ab406a84d04..15459d04b58 100644
--- a/src/devices/machine/ns32081.cpp
+++ b/src/devices/machine/ns32081.cpp
@@ -653,7 +653,7 @@ void ns32081_device_base::execute()
 		}
 	}
 
-	if (!m_out_scb.isunset())
+	if (!m_out_spc.isunset())
 		m_complete->adjust(attotime::from_ticks(m_tcy, clock()));
 
 	m_state = STATUS;
@@ -680,8 +680,8 @@ u16 ns32081_device_base::status(int *icount)
 
 void ns32081_device_base::complete(s32 param)
 {
-	m_out_scb(0);
-	m_out_scb(1);
+	m_out_spc(0);
+	m_out_spc(1);
 }
 
 ns32081_device::ns32081_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock)
@@ -736,6 +736,21 @@ void ns32081_device::reg_set(unsigned const reg, unsigned const op_size, u64 con
 		m_f[reg ^ 1] = u32(op_value >> 32);
 }
 
+u16 ns32081_device::slow_status(int *icount)
+{
+	return status(icount);
+}
+
+u16 ns32081_device::slow_read()
+{
+	return read<u16>();
+}
+
+void ns32081_device::slow_write(u16 data)
+{
+	write<u16>(data);
+}
+
 ns32381_device::ns32381_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock)
 	: ns32081_device_base(mconfig, NS32381, tag, owner, clock)
 	, ns32000_slow_slave_interface(mconfig, *this)
@@ -792,3 +807,33 @@ void ns32381_device::reg_set(unsigned const reg, unsigned const op_size, u64 con
 	else
 		m_l[reg & 6] = (m_l[reg & 6] & 0xffff'ffff'0000'0000ULL) | u32(op_value);
 }
+
+u16 ns32381_device::slow_status(int *icount)
+{
+	return status(icount);
+}
+
+u16 ns32381_device::slow_read()
+{
+	return read<u16>();
+}
+
+void ns32381_device::slow_write(u16 data)
+{
+	write<u16>(data);
+}
+
+u32 ns32381_device::fast_status(int *icount)
+{
+	return status(icount);
+}
+
+u32 ns32381_device::fast_read()
+{
+	return read<u32>();
+}
+
+void ns32381_device::fast_write(u32 data)
+{
+	write<u32>(data);
+}
diff --git a/src/devices/machine/ns32081.h b/src/devices/machine/ns32081.h
index c7fa595bd5f..0fcc9e56b93 100644
--- a/src/devices/machine/ns32081.h
+++ b/src/devices/machine/ns32081.h
@@ -67,9 +67,9 @@ public:
 	virtual void state_add(device_state_interface &parent, int &index) override;
 
 	// ns32000_slow_slave_interface implementation
-	virtual u16 slow_status(int *icount = nullptr) override { return status(icount); }
-	virtual u16 slow_read() override { return read<u16>(); }
-	virtual void slow_write(u16 data) override { write<u16>(data); }
+	virtual u16 slow_status(int *icount = nullptr) override;
+	virtual u16 slow_read() override;
+	virtual void slow_write(u16 data) override;
 
 protected:
 	// device_t implementation
@@ -97,14 +97,14 @@ public:
 	virtual void state_add(device_state_interface &parent, int &index) override;
 
 	// ns32000_slow_slave_interface implementation
-	virtual u16 slow_status(int *icount = nullptr) override { return status(icount); }
-	virtual u16 slow_read() override { return read<u16>(); }
-	virtual void slow_write(u16 data) override { write<u16>(data); }
+	virtual u16 slow_status(int *icount = nullptr) override;
+	virtual u16 slow_read() override;
+	virtual void slow_write(u16 data) override;
 
 	// ns32000_fast_slave_interface implementation
-	virtual u32 fast_status(int *icount = nullptr) override { return status(icount); }
-	virtual u32 fast_read() override { return read<u32>(); }
-	virtual void fast_write(u32 data) override { write<u32>(data); }
+	virtual u32 fast_status(int *icount = nullptr) override;
+	virtual u32 fast_read() override;
+	virtual void fast_write(u32 data) override;
 
 protected:
 	// device_t implementation