diff --git a/src/mame/drivers/cps1.c b/src/mame/drivers/cps1.c
index 79d40be1d96..03f055b847e 100644
--- a/src/mame/drivers/cps1.c
+++ b/src/mame/drivers/cps1.c
@@ -11518,12 +11518,21 @@ DRIVER_INIT_MEMBER(cps_state, ganbare)
 	m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0xff0000, 0xffffff, read16_delegate(FUNC(cps_state::ganbare_ram_r),this), write16_delegate(FUNC(cps_state::ganbare_ram_w),this));
 }
 
+READ16_MEMBER(cps_state::dinohunt_sound_r)
+{
+	/*TODO: understand what's really going on here. According to MT05805;
+	"I think that the values written are only qsound leftovers (after a lot of 0xFF values,
+	there is the same qsound starting sequence, eg: 0x88, 0xFF, 0x0B, 0x00, 0x00, 0x00, ...)."*/
+	return 0xff;
+}
+
 DRIVER_INIT_MEMBER(cps_state,dinohunt)
 {
 	// is this shared with the new sound hw?
-	UINT8* ram = (UINT8*)m_maincpu->space(AS_PROGRAM).install_ram(0xf18000, 0xf19fff);
-	memset(ram,0xff,0x2000);
-	m_maincpu->space(AS_PROGRAM).install_read_handler(0xfc0000, 0xfc0001, read16_delegate(FUNC(cps_state::cps1_in2_r), this));
+	m_maincpu->space(AS_PROGRAM).install_read_handler(0xf18000, 0xf19fff, read16_delegate(FUNC(cps_state::dinohunt_sound_r), this));
+	m_maincpu->space(AS_PROGRAM).install_read_port(0xfc0000, 0xfc0001, "IN2"); ;
+	// the ym2151 doesn't seem to be used. Is it actually on the PCB?
+	
 	DRIVER_INIT_CALL(cps1);
 }
 
diff --git a/src/mame/includes/cps1.h b/src/mame/includes/cps1.h
index 1b6201a8718..d8e7bd75f16 100644
--- a/src/mame/includes/cps1.h
+++ b/src/mame/includes/cps1.h
@@ -242,6 +242,7 @@ public:
 	DECLARE_WRITE8_MEMBER(cps1_oki_pin7_w);
 	DECLARE_WRITE16_MEMBER(sf2m1_layer_w);
 	DECLARE_WRITE16_MEMBER(sf2m3_layer_w);
+	DECLARE_READ16_MEMBER(dinohunt_sound_r);
 	DECLARE_DRIVER_INIT(sf2rb);
 	DECLARE_DRIVER_INIT(sf2rb2);
 	DECLARE_DRIVER_INIT(sf2thndr);