diff --git a/src/mame/drivers/superqix.cpp b/src/mame/drivers/superqix.cpp
index f9a70c1172f..8e26ec8454c 100644
--- a/src/mame/drivers/superqix.cpp
+++ b/src/mame/drivers/superqix.cpp
@@ -184,7 +184,7 @@ READ8_MEMBER(superqix_state::sqix_from_mcu_r)
 TIMER_CALLBACK_MEMBER(superqix_state::mcu_acknowledge_callback)
 {
 	m_Z80HasWritten = 1;
-	m_fromZ80 = m_portb;
+	m_fromZ80 = m_fromZ80pending;
 //  logerror("Z80->MCU %02x\n",m_fromZ80);
 }
 
@@ -197,7 +197,7 @@ READ8_MEMBER(superqix_state::mcu_acknowledge_r)
 WRITE8_MEMBER(superqix_state::sqix_z80_mcu_w)
 {
 //  logerror("%04x: sqix_z80_mcu_w %02x\n",space.device().safe_pc(),data);
-	m_portb = data;
+	m_fromZ80pending = data;
 }
 
 WRITE8_MEMBER(superqix_state::bootleg_mcu_p1_w)
@@ -409,12 +409,12 @@ WRITE8_MEMBER(superqix_state::hotsmash_68705_portB_w)
 
 READ8_MEMBER(superqix_state::hotsmash_68705_portC_r)
 {
-	return m_portC;
+	return m_portC_internal;
 }
 
 WRITE8_MEMBER(superqix_state::hotsmash_68705_portC_w)
 {
-	m_portC = data;
+	m_portC_internal = data;
 
 	if ((data & 0x08) == 0)
 	{
@@ -526,13 +526,13 @@ void superqix_state::machine_init_common()
 	save_item(NAME(m_port3_latch));
 	save_item(NAME(m_fromMCU));
 	save_item(NAME(m_fromZ80));
-	save_item(NAME(m_portb));
+	save_item(NAME(m_fromZ80pending));
 	save_item(NAME(m_nmi_mask));
 
 	// hotsmash ???
 	save_item(NAME(m_portA_in));
 	save_item(NAME(m_portB_out));
-	save_item(NAME(m_portC));
+	save_item(NAME(m_portC_internal));
 }
 
 MACHINE_START_MEMBER(superqix_state,superqix)
diff --git a/src/mame/includes/superqix.h b/src/mame/includes/superqix.h
index 6be6bebba86..6e25c6270e1 100644
--- a/src/mame/includes/superqix.h
+++ b/src/mame/includes/superqix.h
@@ -34,7 +34,7 @@ public:
 	UINT8 m_port3_latch;
 	UINT8 m_fromMCU;
 	UINT8 m_fromZ80;
-	UINT8 m_portb;
+	UINT8 m_fromZ80pending;
 	int m_MCUHasWritten;
 	int m_Z80HasWritten;
 	int m_invert_coin_lockout;
@@ -42,7 +42,7 @@ public:
 	int m_sign[2];
 	UINT8 m_portA_in;
 	UINT8 m_portB_out;
-	UINT8 m_portC;
+	UINT8 m_portC_internal;
 	int m_curr_player;
 	int m_gfxbank;
 	std::unique_ptr<bitmap_ind16> m_fg_bitmap[2];
diff --git a/src/mame/machine/arkanoid.cpp b/src/mame/machine/arkanoid.cpp
index 85c07377e15..bda577de801 100644
--- a/src/mame/machine/arkanoid.cpp
+++ b/src/mame/machine/arkanoid.cpp
@@ -125,20 +125,20 @@ TIMER_CALLBACK_MEMBER(arkanoid_state::timer_68705_increment)
 
 READ8_MEMBER(arkanoid_state::arkanoid_68705_port_c_r)
 {
-	int port_c_in = 0;
+	int portC_in = 0;
 
 	/* bit 0 is latch 1 on ic26, is high if m_Z80HasWritten(latch 1) is set */
 	if (m_Z80HasWritten)
-		port_c_in |= 0x01;
+		portC_in |= 0x01;
 
 	/* bit 1 is the negative output of latch 2 on ic26, is high if m_68705write is clear */
 	if (!m_MCUHasWritten)
-		port_c_in |= 0x02;
+		portC_in |= 0x02;
 
 	/* bit 2 is an output, to clear latch 1, return whatever state it was set to in m_portC_out */
 	/* bit 3 is an output, to set latch 2, return whatever state it was set to in m_portC_out */
 
-	return (m_portC_internal & m_ddrC) | (port_c_in & ~m_ddrC);
+	return (m_portC_internal & m_ddrC) | (portC_in & ~m_ddrC);
 }
 
 WRITE8_MEMBER(arkanoid_state::arkanoid_68705_port_c_w)