diff --git a/src/devices/sound/sp0250.cpp b/src/devices/sound/sp0250.cpp
index c0b0f1c4f13..73e0e6cacff 100644
--- a/src/devices/sound/sp0250.cpp
+++ b/src/devices/sound/sp0250.cpp
@@ -181,7 +181,7 @@ void sp0250_device::write(uint8_t data)
 }
 
 
-uint8_t sp0250_device::drq_r()
+int sp0250_device::drq_r()
 {
 	m_stream->update();
 	return (m_fifo_pos == 15) ? CLEAR_LINE : ASSERT_LINE;
diff --git a/src/devices/sound/sp0250.h b/src/devices/sound/sp0250.h
index 31c32ef4d5d..fb463e25d5b 100644
--- a/src/devices/sound/sp0250.h
+++ b/src/devices/sound/sp0250.h
@@ -14,7 +14,7 @@ public:
 	void set_pwm_mode() { m_pwm_mode = true; }
 
 	void write(uint8_t data);
-	uint8_t drq_r();
+	int drq_r();
 
 protected:
 	// device-level overrides
diff --git a/src/mame/gottlieb/gottlieb.cpp b/src/mame/gottlieb/gottlieb.cpp
index fd59c0367d8..403e36206d3 100644
--- a/src/mame/gottlieb/gottlieb.cpp
+++ b/src/mame/gottlieb/gottlieb.cpp
@@ -2718,7 +2718,7 @@ ROM_START( mach3a )
 	ROM_REGION( 0x10000, "maincpu", 0 )
 	ROM_LOAD( "m3rom4.bin",   0x6000, 0x2000, CRC(8bfd5a44) SHA1(61f5c6c39047c1d0296e2cacce2be9525cb47176) )
 	ROM_LOAD( "m3rom3.bin",   0x8000, 0x2000, CRC(b1b045af) SHA1(4e71ca4661bf5daaf9e2ffbb930ac3b13e2e57bd) )
-	ROM_LOAD( "m3rom2-1.bin",   0xa000, 0x2000, CRC(2b1689a7) SHA1(18714810de6501bc1656261aacf98be228af624e) )
+	ROM_LOAD( "m3rom2-1.bin", 0xa000, 0x2000, CRC(2b1689a7) SHA1(18714810de6501bc1656261aacf98be228af624e) )
 	ROM_LOAD( "m3rom1.bin",   0xc000, 0x2000, CRC(3b0ba80b) SHA1(bc7e961311b40f05f2998f10f0a68f2e515c8e66) )
 	ROM_LOAD( "m3rom0.bin",   0xe000, 0x2000, CRC(70c12bf4) SHA1(c26127b6e2a16791b3be8abac93be6af4f30fb3b) )
 
diff --git a/src/mame/shared/gottlieb_a.cpp b/src/mame/shared/gottlieb_a.cpp
index a97ec995c0e..2d046aa4466 100644
--- a/src/mame/shared/gottlieb_a.cpp
+++ b/src/mame/shared/gottlieb_a.cpp
@@ -504,17 +504,6 @@ gottlieb_sound_r2_device::gottlieb_sound_r2_device(const machine_config &mconfig
 }
 
 
-//-------------------------------------------------
-//  speech_drq_custom_r - return the SP0250
-//  request line as an input port bit
-//-------------------------------------------------
-
-CUSTOM_INPUT_MEMBER(gottlieb_sound_r2_device::speech_drq_custom_r)
-{
-	return m_sp0250->drq_r();
-}
-
-
 //-------------------------------------------------
 //  speech_control_w - primary audio control
 //  register on the speech board
@@ -623,7 +612,7 @@ INPUT_PORTS_START( gottlieb_sound_r2 )
 	PORT_DIPNAME( 0x40, 0x40, "Sound Test" )            PORT_DIPLOCATION("SB2:3")
 	PORT_DIPSETTING(    0x40, DEF_STR( Off ) )
 	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
-	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_CUSTOM ) PORT_CUSTOM_MEMBER(gottlieb_sound_r2_device, speech_drq_custom_r)
+	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_CUSTOM ) PORT_READ_LINE_DEVICE_MEMBER("spsnd", sp0250_device, drq_r)
 INPUT_PORTS_END
 
 ioport_constructor gottlieb_sound_r2_device::device_input_ports() const
diff --git a/src/mame/shared/gottlieb_a.h b/src/mame/shared/gottlieb_a.h
index 2786273fa0b..ffbd920b19b 100644
--- a/src/mame/shared/gottlieb_a.h
+++ b/src/mame/shared/gottlieb_a.h
@@ -233,8 +233,6 @@ public:
 	// configuration helpers
 	void enable_cobram3_mods() { m_cobram3_mod = true; }
 
-	CUSTOM_INPUT_MEMBER(speech_drq_custom_r);
-
 protected:
 	// device-level overrides
 	virtual void device_add_mconfig(machine_config &config) override;