diff --git a/src/mame/drivers/hh_cop400.cpp b/src/mame/drivers/hh_cop400.cpp
index a946ceffc08..fcf3eabc189 100644
--- a/src/mame/drivers/hh_cop400.cpp
+++ b/src/mame/drivers/hh_cop400.cpp
@@ -653,16 +653,33 @@ public:
 	plus1_state(const machine_config &mconfig, device_type type, const char *tag)
 		: hh_cop400_state(mconfig, type, tag)
 	{ }
+
+	DECLARE_WRITE8_MEMBER(write_d);
 };
 
 // handlers
 
-//..
+WRITE8_MEMBER(plus1_state::write_d)
+{
+	// D?: speaker out
+	m_speaker->level_w(data & 1);
+}
 
 
 // config
 
 static INPUT_PORTS_START( plus1 )
+	PORT_START("IN.0") // port G
+	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_UNUSED )
+	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_BUTTON1 )
+	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON2 )
+	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNUSED )
+
+	PORT_START("IN.1") // port L
+	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_BUTTON3 )
+	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNUSED )
+	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNUSED )
+	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON4 )
 INPUT_PORTS_END
 
 static MACHINE_CONFIG_START( plus1, plus1_state )
@@ -670,6 +687,9 @@ static MACHINE_CONFIG_START( plus1, plus1_state )
 	/* basic machine hardware */
 	MCFG_CPU_ADD("maincpu", COP410, 1000000) // approximation - RC osc. R=51K to +5V, C=100pf to GND
 	MCFG_COP400_CONFIG(COP400_CKI_DIVISOR_16, COP400_CKO_OSCILLATOR_OUTPUT, true) // guessed
+	MCFG_COP400_WRITE_D_CB(WRITE8(plus1_state, write_d))
+	MCFG_COP400_READ_G_CB(IOPORT("IN.0"))
+	MCFG_COP400_READ_L_CB(IOPORT("IN.1"))
 
 	/* no visual feedback! */
 
diff --git a/src/mame/drivers/hh_hmcs40.cpp b/src/mame/drivers/hh_hmcs40.cpp
index 02434fd6f48..d3639a6fb84 100644
--- a/src/mame/drivers/hh_hmcs40.cpp
+++ b/src/mame/drivers/hh_hmcs40.cpp
@@ -58,10 +58,10 @@
  @88      HD38820A  1984, Bandai Pair Match (PT-460) (1/2)
  @89      HD38820A  1984, Bandai Pair Match (PT-460) (2/2)
 
- *75      HD44801A  1982, Alpha 8201 protection MCU (have dump)
+  75      HD44801A  1982, Alpha 8201 protection MCU -> machine/alpha8201.*
 
- *35      HD44801B  1983, Alpha 8302 protection MCU (have dump)
- *42      HD44801B  1984, Alpha 8303 protection MCU (have dump)
+  35      HD44801B  1983, Alpha 8302 protection MCU (see 8201)
+  42      HD44801B  1984, Alpha 8303 protection MCU (see 8201)
 
   (* denotes not yet emulated by MAME, @ denotes it's in this driver)