diff --git a/src/emu/sound/l7a1045_l6028_dsp_a.c b/src/emu/sound/l7a1045_l6028_dsp_a.c
index f845435caae..13df8251c37 100644
--- a/src/emu/sound/l7a1045_l6028_dsp_a.c
+++ b/src/emu/sound/l7a1045_l6028_dsp_a.c
@@ -307,7 +307,7 @@ READ16_MEMBER(l7a1045_sound_device::l7a1045_sound_port_0004_r)
 
 
 	}
-	return rand();
+	return 0;
 }
 
 READ16_MEMBER(l7a1045_sound_device::l7a1045_sound_port_0006_r)
diff --git a/src/mame/audio/hng64.c b/src/mame/audio/hng64.c
index c09258d3539..b1e1be7ff9a 100644
--- a/src/mame/audio/hng64.c
+++ b/src/mame/audio/hng64.c
@@ -205,7 +205,7 @@ READ16_MEMBER(hng64_state::hng64_sound_port_0008_r)
 {
 	// read in irq5
 	logerror("%08x: hng64_sound_port_0008_r mask (%04x)\n", space.device().safe_pc(), mem_mask);
-	return rand();
+	return 0;
 }
 
 
@@ -254,44 +254,45 @@ WRITE16_MEMBER(hng64_state::hng64_sound_port_000c_w)
 }
 
 
-WRITE16_MEMBER(hng64_state::hng64_sound_port_0102_w)
-{
-	logerror("hng64_port 0x0102 %04x\n", data);
-}
-
 WRITE16_MEMBER(hng64_state::hng64_sound_port_0080_w)
 {
 	logerror("hng64_port 0x0080 %04x\n", data);
 }
 
-READ16_MEMBER(hng64_state::hng64_sound_port_0106_r)
+
+WRITE16_MEMBER(hng64_state::sound_comms_w)
 {
-	// read in irq5
-	logerror("%08x: hng64_sound_port_0106_r mask (%04x)\n", space.device().safe_pc(), mem_mask);
-	return rand();
+	switch(offset*2)
+	{
+		case 0x0:
+			COMBINE_DATA(&sound_latch[0]);
+			return;
+		case 0x2:
+			COMBINE_DATA(&sound_latch[1]);
+			return;
+		case 0xa:
+			/* correct? */
+			m_audiocpu->set_input_line(5, CLEAR_LINE);
+			if(data)
+				printf("IRQ ACK %02x?\n",data);
+			return; // intentional for log
+	}
+	
+	printf("SOUND W %02x %04x\n",offset*2,data);
 }
 
-WRITE16_MEMBER(hng64_state::hng64_sound_port_010a_w)
+READ16_MEMBER(hng64_state::sound_comms_r)
 {
-	logerror("%08x: hng64_port hng64_sound_port_010a_w %04x mask (%04x)\n",  space.device().safe_pc(), data, mem_mask);
-}
-
-WRITE16_MEMBER(hng64_state::hng64_sound_port_0108_w)
-{
-	logerror("%08x: hng64_port hng64_sound_port_0108_w %04x mask (%04x)\n",  space.device().safe_pc(), data, mem_mask);
-}
-
-
-WRITE16_MEMBER(hng64_state::hng64_sound_port_0100_w)
-{
-	logerror("%08x: hng64_port hng64_sound_port_0100_w %04x mask (%04x)\n",  space.device().safe_pc(), data, mem_mask);
-}
-
-READ16_MEMBER(hng64_state::hng64_sound_port_0104_r)
-{
-	// read in irq5
-	logerror("%08x: hng64_sound_port_0104_r mask (%04x)\n", space.device().safe_pc(), mem_mask);
-	return rand();
+	switch(offset*2)
+	{
+		case 0x04:
+			return main_latch[0];
+		case 0x06:
+			return main_latch[1];
+	}
+	printf("SOUND R %02x\n",offset*2);
+	
+	return 0;
 }
 
 static ADDRESS_MAP_START( hng_sound_io, AS_IO, 16, hng64_state )
@@ -303,12 +304,7 @@ static ADDRESS_MAP_START( hng_sound_io, AS_IO, 16, hng64_state )
 
 	AM_RANGE(0x0080, 0x0081) AM_WRITE( hng64_sound_port_0080_w )
 
-	AM_RANGE(0x0100, 0x0101) AM_WRITE( hng64_sound_port_0100_w )
-	AM_RANGE(0x0102, 0x0103) AM_WRITE( hng64_sound_port_0102_w ) // gets values of 0x0080 / 0x0081 / 0x0000 / 0x0001 depending on return from 0x0106 in irq5?
-	AM_RANGE(0x0104, 0x0105) AM_READ( hng64_sound_port_0104_r )
-	AM_RANGE(0x0106, 0x0107) AM_READ( hng64_sound_port_0106_r )
-	AM_RANGE(0x0108, 0x0109) AM_WRITE( hng64_sound_port_0108_w )
-	AM_RANGE(0x010a, 0x010b) AM_WRITE( hng64_sound_port_010a_w )
+	AM_RANGE(0x0100, 0x010f) AM_READWRITE( sound_comms_r,sound_comms_w )
 
 	AM_RANGE(0x0200, 0x021f) AM_WRITE( hng64_sound_bank_w ) // ??
 
@@ -342,7 +338,7 @@ WRITE_LINE_MEMBER(hng64_state::tcu_tm1_cb)
 {
 	// these are very active, maybe they feed back into the v53 via one of the IRQ pins?  TM2 toggles more rapidly than TM1
 //  logerror("tcu_tm1_cb %02x\n", state);
-	m_audiocpu->set_input_line(5, state? ASSERT_LINE:CLEAR_LINE); // not accurate, just so we have a trigger
+	//m_audiocpu->set_input_line(5, state? ASSERT_LINE:CLEAR_LINE); // not accurate, just so we have a trigger
 }
 
 WRITE_LINE_MEMBER(hng64_state::tcu_tm2_cb)
@@ -351,10 +347,10 @@ WRITE_LINE_MEMBER(hng64_state::tcu_tm2_cb)
 //  logerror("tcu_tm2_cb %02x\n", state);
 
 	// NOT ACCURATE, just so that all the interrupts get triggered for now.
-	static int i = 0;
-	m_audiocpu->set_input_line(i, state? ASSERT_LINE:CLEAR_LINE);
-	i++;
-	if (i == 3) i = 0;
+	//static int i = 0;
+	//m_audiocpu->set_input_line(i, state? ASSERT_LINE:CLEAR_LINE);
+	//i++;
+	//if (i == 3) i = 0;
 }
 
 
diff --git a/src/mame/drivers/hng64.c b/src/mame/drivers/hng64.c
index 7046dccd0c6..d3e9a96b7b7 100644
--- a/src/mame/drivers/hng64.c
+++ b/src/mame/drivers/hng64.c
@@ -922,6 +922,43 @@ WRITE32_MEMBER(hng64_state::hng64_vregs_w)
 	COMBINE_DATA(&m_videoregs[offset]);
 }
 
+READ16_MEMBER(hng64_state::main_sound_comms_r)
+{
+	switch(offset *2)
+	{
+		case 0x04:
+			return sound_latch[0];
+		case 0x06:
+			return sound_latch[1];
+		default:
+			printf("%08x R\n",offset*2);
+			break;
+	}
+	return 0;
+}
+
+WRITE16_MEMBER(hng64_state::main_sound_comms_w)
+{
+	switch(offset * 2)
+	{
+		case 0x00:
+			COMBINE_DATA(&main_latch[0]);
+			break;
+		case 0x02:
+			COMBINE_DATA(&main_latch[1]);
+			break;
+		case 0x08:
+			m_audiocpu->set_input_line(5, ASSERT_LINE);
+			if(data != 1)
+				printf("IRQ send %02x?\n",data);
+			break;
+		default:
+			printf("%02x %04x\n",offset*2,data);
+			break;
+	}
+}
+
+
 static ADDRESS_MAP_START( hng_map, AS_PROGRAM, 32, hng64_state )
 
 	AM_RANGE(0x00000000, 0x00ffffff) AM_RAM AM_SHARE("mainram")
@@ -963,9 +1000,7 @@ static ADDRESS_MAP_START( hng_map, AS_PROGRAM, 32, hng64_state )
 	AM_RANGE(0x60200000, 0x603fffff) AM_READWRITE(hng64_soundram_r, hng64_soundram_w)   // program + data for V53A gets uploaded here
 
 	// These are sound ports of some sort
-//  AM_RANGE(0x68000000, 0x68000003) AM_WRITENOP    // ??
-//  AM_RANGE(0x68000004, 0x68000007) AM_READNOP     // ??
-//  AM_RANGE(0x68000008, 0x6800000b) AM_WRITENOP    // ??
+	AM_RANGE(0x68000000, 0x6800000f) AM_READWRITE16(main_sound_comms_r,main_sound_comms_w,0xffffffff)
 	AM_RANGE(0x6f000000, 0x6f000003) AM_WRITE(hng64_soundcpu_enable_w)
 
 	// Communications
diff --git a/src/mame/includes/hng64.h b/src/mame/includes/hng64.h
index 9970a7b3fc5..9ae7d6d034b 100644
--- a/src/mame/includes/hng64.h
+++ b/src/mame/includes/hng64.h
@@ -381,4 +381,9 @@ public:
 	DECLARE_WRITE16_MEMBER(hng64_sound_port_010a_w);
 
 	DECLARE_WRITE16_MEMBER(hng64_sound_bank_w);
+	DECLARE_READ16_MEMBER(main_sound_comms_r);
+	DECLARE_WRITE16_MEMBER(main_sound_comms_w);
+	DECLARE_READ16_MEMBER(sound_comms_r);
+	DECLARE_WRITE16_MEMBER(sound_comms_w);
+	UINT16 main_latch[2],sound_latch[2];
 };