diff --git a/src/mame/includes/amstrad.h b/src/mame/includes/amstrad.h
index b46afb75dc8..a8723c09325 100644
--- a/src/mame/includes/amstrad.h
+++ b/src/mame/includes/amstrad.h
@@ -317,6 +317,7 @@ protected:
 	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
 
 	int m_centronics_busy;
+	UINT8 m_last_write;
 };
 
 
diff --git a/src/mame/machine/amstrad.cpp b/src/mame/machine/amstrad.cpp
index 192702abd08..e253856b2f1 100644
--- a/src/mame/machine/amstrad.cpp
+++ b/src/mame/machine/amstrad.cpp
@@ -1863,8 +1863,8 @@ READ8_MEMBER(amstrad_state::amstrad_cpc_io_r)
 		}
 	}
 
-	if ( m_system_type == SYSTEM_PLUS || m_system_type == SYSTEM_GX4000 )  // Plus systems return 0 when attempting to read the gate array (and any other unreadable space too?)
-		data = 0;
+	if ( m_system_type == SYSTEM_PLUS || m_system_type == SYSTEM_GX4000 )  // Plus systems return 0x78 (464+) or 0x79 (6128+) when attempting to read the gate array (and any other unreadable space too?)
+		data = 0x79;
 
 	/* if b14 = 0 : CRTC Read selected */
 	if ((offset & (1<<14)) == 0)
@@ -1913,6 +1913,9 @@ b9 b8 | PPI Function Read/Write status
 	{
 		if (r1r0 < 0x03 )
 			data = m_ppi->read(space, r1r0);
+		if ( m_system_type == SYSTEM_PLUS || m_system_type == SYSTEM_GX4000 )  // Plus systems return the data written to port C (I/O status is ignored)
+			if(r1r0 == 0x02)
+				data = m_last_write;
 	}
 
 /* if b10 = 0 : Expansion Peripherals Read selected
@@ -2104,9 +2107,11 @@ WRITE8_MEMBER(amstrad_state::amstrad_cpc_io_w)
 	*/
 	if ((offset & (1<<11)) == 0)
 	{
-		unsigned int Index = ((offset & 0x0300) >> 8);
+		unsigned int idx = ((offset & 0x0300) >> 8);
 
-		m_ppi->write(space, Index, data);
+		m_ppi->write(space, idx, data);
+		if(idx == 0x02)
+			m_last_write = data;
 	}
 
 	/* if b10 = 0 : Expansion Peripherals Write selected */
@@ -2335,6 +2340,8 @@ Once all tables and jumpblocks have been set up,
 control is passed to the default entry in rom 0*/
 void amstrad_state::amstrad_reset_machine()
 {
+	m_last_write = 0xff;
+	
 	/* enable lower rom (OS rom) */
 	amstrad_GateArray_write(0x089);