diff --git a/src/devices/bus/electron/plus1.cpp b/src/devices/bus/electron/plus1.cpp
index 447fe2a7314..9bb500b586d 100644
--- a/src/devices/bus/electron/plus1.cpp
+++ b/src/devices/bus/electron/plus1.cpp
@@ -97,7 +97,7 @@ MACHINE_CONFIG_START(electron_plus1_device::device_add_mconfig)
 	MCFG_CENTRONICS_OUTPUT_LATCH_ADD("cent_data_out", "centronics")
 
 	/* adc */
-	ADC0844(config, m_adc, 0);
+	ADC0844(config, m_adc);
 	m_adc->intr_callback().set(FUNC(electron_plus1_device::ready_w));
 	m_adc->ch1_callback().set_ioport("JOY1");
 	m_adc->ch2_callback().set_ioport("JOY2");
diff --git a/src/devices/machine/adc083x.h b/src/devices/machine/adc083x.h
index e7a390e106f..202c0ba94f5 100644
--- a/src/devices/machine/adc083x.h
+++ b/src/devices/machine/adc083x.h
@@ -92,28 +92,28 @@ private:
 class adc0831_device : public adc083x_device
 {
 public:
-	adc0831_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+	adc0831_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
 };
 
 
 class adc0832_device : public adc083x_device
 {
 public:
-	adc0832_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+	adc0832_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
 };
 
 
 class adc0834_device : public adc083x_device
 {
 public:
-	adc0834_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+	adc0834_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
 };
 
 
 class adc0838_device : public adc083x_device
 {
 public:
-	adc0838_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+	adc0838_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
 };
 
 
diff --git a/src/devices/machine/adc0844.h b/src/devices/machine/adc0844.h
index cdb98d13701..d20d9697a09 100644
--- a/src/devices/machine/adc0844.h
+++ b/src/devices/machine/adc0844.h
@@ -34,7 +34,7 @@ class adc0844_device : public device_t
 {
 public:
 	// construction/destruction
-	adc0844_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+	adc0844_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
 
 	// configuration
 	auto intr_callback() { return m_intr_cb.bind(); }
@@ -70,7 +70,7 @@ class adc0848_device : public adc0844_device
 {
 public:
 	// construction/destruction
-	adc0848_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+	adc0848_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
 
 	// configuration
 	auto ch5_callback() { return m_ch5_cb.bind(); }
diff --git a/src/mame/drivers/einstein.cpp b/src/mame/drivers/einstein.cpp
index d66c1952253..fb2f5c40e7e 100644
--- a/src/mame/drivers/einstein.cpp
+++ b/src/mame/drivers/einstein.cpp
@@ -625,7 +625,7 @@ MACHINE_CONFIG_START(einstein_state::einstein)
 	m_psg->port_a_write_callback().set(FUNC(einstein_state::keyboard_line_write));
 	m_psg->add_route(ALL_OUTPUTS, "mono", 0.20);
 
-	adc0844_device &adc(ADC0844(config, "adc", 0));
+	adc0844_device &adc(ADC0844(config, "adc"));
 	adc.intr_callback().set(m_adc_daisy, FUNC(z80daisy_generic_device::int_w));
 	adc.ch1_callback().set_ioport("analogue_1_x");
 	adc.ch2_callback().set_ioport("analogue_1_y");
diff --git a/src/mame/drivers/konamigx.cpp b/src/mame/drivers/konamigx.cpp
index a81d2f6a0c1..7e70a4eaf2e 100644
--- a/src/mame/drivers/konamigx.cpp
+++ b/src/mame/drivers/konamigx.cpp
@@ -1792,7 +1792,7 @@ void konamigx_state::opengolf(machine_config &config)
 
 	m_maincpu->set_addrmap(AS_PROGRAM, &konamigx_state::gx_type1_map);
 
-	adc0834_device &adc(ADC0834(config, "adc0834", 0));
+	adc0834_device &adc(ADC0834(config, "adc0834"));
 	adc.set_input_callback(FUNC(konamigx_state::adc0834_callback));
 }
 
diff --git a/src/mame/drivers/ksys573.cpp b/src/mame/drivers/ksys573.cpp
index 29dfc708b0c..84c7de9e613 100644
--- a/src/mame/drivers/ksys573.cpp
+++ b/src/mame/drivers/ksys573.cpp
@@ -2143,7 +2143,7 @@ void ksys573_state::konami573(machine_config &config)
 
 	M48T58(config, "m48t58", 0);
 
-	adc0834_device &adc(ADC0834(config, "adc0834", 0));
+	adc0834_device &adc(ADC0834(config, "adc0834"));
 	adc.set_input_callback(FUNC(ksys573_state::analogue_inputs_callback));
 }
 
diff --git a/src/mame/drivers/mcr3.cpp b/src/mame/drivers/mcr3.cpp
index b37e5d3df42..fa2a86a9552 100644
--- a/src/mame/drivers/mcr3.cpp
+++ b/src/mame/drivers/mcr3.cpp
@@ -1132,7 +1132,7 @@ void mcr3_state::maxrpm(machine_config &config)
 {
 	mono_tcs(config);
 
-	ADC0844(config, m_maxrpm_adc, 0);
+	ADC0844(config, m_maxrpm_adc);
 	m_maxrpm_adc->ch1_callback().set_ioport("MONO.IP1");
 	m_maxrpm_adc->ch2_callback().set_ioport("MONO.IP1.ALT1");
 	m_maxrpm_adc->ch3_callback().set_ioport("MONO.IP1.ALT2");
diff --git a/src/mame/drivers/mcr68.cpp b/src/mame/drivers/mcr68.cpp
index b8c4a83b335..7548f3513e0 100644
--- a/src/mame/drivers/mcr68.cpp
+++ b/src/mame/drivers/mcr68.cpp
@@ -959,7 +959,7 @@ MACHINE_CONFIG_START(mcr68_state::spyhunt2)
 	MCFG_DEVICE_ADD("tcs", MIDWAY_TURBO_CHEAP_SQUEAK)
 	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "speaker", 1.0)
 
-	ADC0844(config, m_adc, 0);
+	ADC0844(config, m_adc);
 	m_adc->ch1_callback().set_ioport("AN1");
 	m_adc->ch2_callback().set_ioport("AN2");
 	m_adc->ch3_callback().set_ioport("AN3");
diff --git a/src/mame/drivers/micro3d.cpp b/src/mame/drivers/micro3d.cpp
index 10034b78637..78f5009312a 100644
--- a/src/mame/drivers/micro3d.cpp
+++ b/src/mame/drivers/micro3d.cpp
@@ -372,7 +372,7 @@ MACHINE_CONFIG_START(micro3d_state::micro3d)
 	monitor_vgb.rxd_handler().set(m_vgb_uart, FUNC(mc2661_device::rx_w));
 	monitor_vgb.dsr_handler().set(m_vgb_uart, FUNC(mc2661_device::dsr_w));
 
-	ADC0844(config, m_adc, 0);
+	ADC0844(config, m_adc);
 	m_adc->intr_callback().set("mfp", FUNC(mc68901_device::i3_w));
 	m_adc->ch1_callback().set_ioport("THROTTLE");
 	m_adc->ch2_callback().set(FUNC(micro3d_state::adc_volume_r));
diff --git a/src/mame/drivers/midvunit.cpp b/src/mame/drivers/midvunit.cpp
index 22610c0c6a4..43dc19af1cf 100644
--- a/src/mame/drivers/midvunit.cpp
+++ b/src/mame/drivers/midvunit.cpp
@@ -1082,7 +1082,7 @@ void midvunit_state::midvunit(machine_config &config)
 {
 	midvcommon(config);
 
-	ADC0844(config, m_adc, 0);
+	ADC0844(config, m_adc);
 	m_adc->intr_callback().set_inputline("maincpu", 3);
 	m_adc->ch1_callback().set_ioport("WHEEL");
 	m_adc->ch2_callback().set_ioport("ACCEL");
diff --git a/src/mame/drivers/midxunit.cpp b/src/mame/drivers/midxunit.cpp
index 25466619eaf..505ee7f0624 100644
--- a/src/mame/drivers/midxunit.cpp
+++ b/src/mame/drivers/midxunit.cpp
@@ -270,7 +270,7 @@ void midxunit_state::midxunit(machine_config &config)
 	/* serial prefixes 419, 420 */
 	m_midway_serial_pic->set_upper(419);
 
-	adc0848_device &adc(ADC0848(config, "adc", 0));
+	adc0848_device &adc(ADC0848(config, "adc"));
 	adc.intr_callback().set(FUNC(midxunit_state::adc_int_w)); // ADC INT passed through PLSI1032
 	adc.ch1_callback().set_ioport("AN0");
 	adc.ch2_callback().set_ioport("AN1");
diff --git a/src/mame/drivers/midyunit.cpp b/src/mame/drivers/midyunit.cpp
index df5e4aa1f60..df2382c0027 100644
--- a/src/mame/drivers/midyunit.cpp
+++ b/src/mame/drivers/midyunit.cpp
@@ -1255,7 +1255,7 @@ MACHINE_CONFIG_END
 void midyunit_state::term2(machine_config &config)
 {
 	yunit_adpcm_6bit_faster(config);
-	ADC0844(config, m_term2_adc, 0); // U2 on Coil Lamp Driver Board (A-14915)
+	ADC0844(config, m_term2_adc); // U2 on Coil Lamp Driver Board (A-14915)
 	m_term2_adc->ch1_callback().set_ioport("STICK0_X");
 	m_term2_adc->ch2_callback().set_ioport("STICK0_Y");
 	m_term2_adc->ch3_callback().set_ioport("STICK1_X");
diff --git a/src/mame/drivers/seta.cpp b/src/mame/drivers/seta.cpp
index 64f32d50c13..00b107dac0a 100644
--- a/src/mame/drivers/seta.cpp
+++ b/src/mame/drivers/seta.cpp
@@ -8780,7 +8780,7 @@ void zombraid_state::zombraid(machine_config &config)
 
 	NVRAM(config, "nvram", nvram_device::DEFAULT_ALL_0);
 
-	adc0834_device &adc(ADC0834(config, "adc", 0));
+	adc0834_device &adc(ADC0834(config, "adc"));
 	adc.set_input_callback(FUNC(zombraid_state::adc_cb));
 
 	m_x1->set_addrmap(0, &zombraid_state::zombraid_x1_map);
diff --git a/src/mame/drivers/zr107.cpp b/src/mame/drivers/zr107.cpp
index 240ae2de21e..1c41778ebbc 100644
--- a/src/mame/drivers/zr107.cpp
+++ b/src/mame/drivers/zr107.cpp
@@ -837,7 +837,7 @@ void zr107_state::zr107(machine_config &config)
 	k054539_2.add_route(0, "lspeaker", 0.75);
 	k054539_2.add_route(1, "rspeaker", 0.75);
 
-	adc0838_device &adc(ADC0838(config, "adc0838", 0));
+	adc0838_device &adc(ADC0838(config, "adc0838"));
 	adc.set_input_callback(FUNC(zr107_state::adc0838_callback));
 
 	KONPPC(config, m_konppc, 0);
diff --git a/src/mame/machine/k573cass.cpp b/src/mame/machine/k573cass.cpp
index 78d6fd046ff..7991d46cf15 100644
--- a/src/mame/machine/k573cass.cpp
+++ b/src/mame/machine/k573cass.cpp
@@ -125,7 +125,7 @@ void konami573_cassette_xi_device::device_add_mconfig(machine_config &config)
 {
 	X76F041( config, m_x76f041 );
 	DS2401( config, m_ds2401 );
-	ADC0838( config, m_adc0838, 0 );
+	ADC0838( config, m_adc0838 );
 }
 
 WRITE_LINE_MEMBER(konami573_cassette_xi_device::write_line_d0)