diff --git a/src/emu/machine/7200fifo.c b/src/emu/machine/7200fifo.c
index 34316a13965..1794d4ce737 100644
--- a/src/emu/machine/7200fifo.c
+++ b/src/emu/machine/7200fifo.c
@@ -67,9 +67,9 @@ void fifo7200_device::device_reset()
 	m_ff = 0;
 	m_hf = 0;
 
-	if (!m_ef_handler.isnull()) m_ef_handler(m_ef);
-	if (!m_ff_handler.isnull()) m_ff_handler(m_ff);
-	if (!m_hf_handler.isnull()) m_hf_handler(m_hf);
+	if (!m_ef_handler.isnull()) m_ef_handler(!m_ef);
+	if (!m_ff_handler.isnull()) m_ff_handler(!m_ff);
+	if (!m_hf_handler.isnull()) m_hf_handler(!m_hf);
 }
 
 
@@ -89,19 +89,19 @@ void fifo7200_device::fifo_write(UINT16 data)
 	if (m_ef)
 	{
 		m_ef = 0;
-		if (!m_ef_handler.isnull()) m_ef_handler(m_ef);
+		if (!m_ef_handler.isnull()) m_ef_handler(!m_ef);
 	}
 
 	else if (m_read_ptr == m_write_ptr)
 	{
 		m_ff = 1;
-		if (!m_ff_handler.isnull()) m_ff_handler(m_ff);
+		if (!m_ff_handler.isnull()) m_ff_handler(!m_ff);
 	}
 
 	else if (((m_read_ptr + 1 + m_ram_size / 2) % m_ram_size) == m_write_ptr)
 	{
 		m_hf = 1;
-		if (!m_hf_handler.isnull()) m_hf_handler(m_hf);
+		if (!m_hf_handler.isnull()) m_hf_handler(!m_hf);
 	}
 }
 
@@ -120,19 +120,19 @@ UINT16 fifo7200_device::fifo_read()
 	if (m_ff)
 	{
 		m_ff = 0;
-		if (!m_ff_handler.isnull()) m_ff_handler(m_ff);
+		if (!m_ff_handler.isnull()) m_ff_handler(!m_ff);
 	}
 
 	else if (m_read_ptr == m_write_ptr)
 	{
 		m_ef = 1;
-		if (!m_ef_handler.isnull()) m_ef_handler(m_ef);
+		if (!m_ef_handler.isnull()) m_ef_handler(!m_ef);
 	}
 
 	else if (((m_read_ptr + m_ram_size / 2) % m_ram_size) == m_write_ptr)
 	{
 		m_hf = 0;
-		if (!m_hf_handler.isnull()) m_hf_handler(m_hf);
+		if (!m_hf_handler.isnull()) m_hf_handler(!m_hf);
 	}
 
 	return ret;
diff --git a/src/emu/machine/7200fifo.h b/src/emu/machine/7200fifo.h
index f3e102828ab..4ff1a0d17c9 100644
--- a/src/emu/machine/7200fifo.h
+++ b/src/emu/machine/7200fifo.h
@@ -92,9 +92,9 @@ public:
 	template<class _Object> static devcb2_base &set_hf_handler(device_t &device, _Object object) { return downcast<fifo7200_device &>(device).m_hf_handler.set_callback(object); }
 	static void set_ram_size(device_t &device, int size) { downcast<fifo7200_device &>(device).m_ram_size = size; }
 
-	DECLARE_READ_LINE_MEMBER( ef_r ) { return m_ef; }
-	DECLARE_READ_LINE_MEMBER( ff_r ) { return m_ff; }
-	DECLARE_READ_LINE_MEMBER( hf_r ) { return m_hf; }
+	DECLARE_READ_LINE_MEMBER( ef_r ) { return !m_ef; } // _EF
+	DECLARE_READ_LINE_MEMBER( ff_r ) { return !m_ff; } // _FF
+	DECLARE_READ_LINE_MEMBER( hf_r ) { return !m_hf; } // _HF
 
 	// normal configuration
 	DECLARE_WRITE16_MEMBER( data_word_w ) { fifo_write(data); }
diff --git a/src/mame/drivers/seibuspi.c b/src/mame/drivers/seibuspi.c
index 6f0584b219c..c49ea8a5274 100644
--- a/src/mame/drivers/seibuspi.c
+++ b/src/mame/drivers/seibuspi.c
@@ -876,8 +876,8 @@ READ8_MEMBER(seibuspi_state::sound_fifo_status_r)
 	// d0: fifo full flag (z80)
 	// d1: fifo empty flag (main)
 	// other bits: unused?
-	int d1 = (m_soundfifo2 != NULL) ? ~m_soundfifo2->ef_r() << 1 & 0x02 : 0;
-	return d1 | (~m_soundfifo1->ff_r() & 0x01);
+	int d1 = (m_soundfifo2 != NULL) ? m_soundfifo2->ef_r() << 1 : 0;
+	return d1 | m_soundfifo1->ff_r();
 }
 
 READ8_MEMBER(seibuspi_state::spi_status_r)
@@ -1058,8 +1058,8 @@ READ8_MEMBER(seibuspi_state::z80_soundfifo_status_r)
 	// d0: fifo full flag (main)
 	// d1: fifo empty flag (z80)
 	// other bits: unused?
-	int d0 = (m_soundfifo2 != NULL) ? ~m_soundfifo2->ff_r() & 0x01 : 0;
-	return d0 | (~m_soundfifo1->ef_r() << 1 & 0x02);
+	int d0 = (m_soundfifo2 != NULL) ? m_soundfifo2->ff_r() : 0;
+	return d0 | m_soundfifo1->ef_r() << 1;
 }
 
 WRITE8_MEMBER(seibuspi_state::z80_bank_w)
diff --git a/src/mame/drivers/zn.c b/src/mame/drivers/zn.c
index fea56079131..524d26c1b44 100644
--- a/src/mame/drivers/zn.c
+++ b/src/mame/drivers/zn.c
@@ -2449,7 +2449,7 @@ MACHINE_CONFIG_END
 READ8_MEMBER(zn_state::cbaj_sound_main_status_r)
 {
 	// d1: fifo empty flag, other bits: unused(?)
-	return ~(m_cbaj_fifo2->ef_r() << 1);
+	return m_cbaj_fifo2->ef_r() << 1;
 }
 
 static ADDRESS_MAP_START(coh1002msnd_map, AS_PROGRAM, 32, zn_state)
@@ -2463,7 +2463,7 @@ ADDRESS_MAP_END
 READ8_MEMBER(zn_state::cbaj_sound_z80_status_r)
 {
 	// d1: fifo empty flag, other bits: unused
-	return ~(m_cbaj_fifo1->ef_r() << 1);
+	return m_cbaj_fifo1->ef_r() << 1;
 }
 
 static ADDRESS_MAP_START( cbaj_z80_map, AS_PROGRAM, 8, zn_state )