upd765: Add (mostly standard) clocks to all devices in the family (nw)

These clocks are currently unused, and their sources and dividers are often unclear. In some cases they are clearly software-configurable, which has not been emulated at all.

src/devices/bus/a2bus/corvfdc02.cpp

@@ -54,7 +54,7 @@ ROM_END
 
 void a2bus_corvfdc02_device::device_add_mconfig(machine_config &config)
 {
-	UPD765A(config, m_fdc, true, false);
+	UPD765A(config, m_fdc, 8'000'000, true, false);
 	m_fdc->intrq_wr_callback().set(FUNC(a2bus_corvfdc02_device::intrq_w));
 	m_fdc->drq_wr_callback().set(FUNC(a2bus_corvfdc02_device::drq_w));
 	FLOPPY_CONNECTOR(config, m_con1, corv_floppies, "525dsqd", a2bus_corvfdc02_device::corv_floppy_formats);

src/devices/bus/bbc/fdc/opus.cpp

@@ -95,7 +95,7 @@ ROM_END
 
 void bbc_opus8272_device::device_add_mconfig(machine_config &config)
 {
-	I8272A(config, m_fdc, true);
+	I8272A(config, m_fdc, 8'000'000, true);
 	m_fdc->intrq_wr_callback().set(DEVICE_SELF_OWNER, FUNC(bbc_fdc_slot_device::intrq_w));
 
 	FLOPPY_CONNECTOR(config, m_floppy0, bbc_floppies_525, "525qd", bbc_opusfdc_device::floppy_formats).enable_sound(true);

src/devices/bus/cbmiec/fd2000.cpp

@@ -217,9 +217,9 @@ FLOPPY_FORMATS_END
 
 void fd2000_device::add_common_devices(machine_config &config)
 {
-	M65C02(config, m_maincpu, XTAL(24'000'000)/12);
+	M65C02(config, m_maincpu, 24_MHz_XTAL / 12);
 
-	via6522_device &via(VIA6522(config, G65SC22P2_TAG, XTAL(24'000'000)/12));
+	via6522_device &via(VIA6522(config, G65SC22P2_TAG, 24_MHz_XTAL / 12));
 	via.readpa_handler().set(FUNC(fd2000_device::via_pa_r));
 	via.readpb_handler().set(FUNC(fd2000_device::via_pb_r));
 	via.writepa_handler().set(FUNC(fd2000_device::via_pa_w));
@@ -230,7 +230,7 @@ void fd2000_device::device_add_mconfig(machine_config &config)
 {
 	add_common_devices(config);
 	m_maincpu->set_addrmap(AS_PROGRAM, &fd2000_device::fd2000_mem);
-	DP8473(config, m_fdc, 0);
+	DP8473(config, m_fdc, 24_MHz_XTAL);
 	FLOPPY_CONNECTOR(config, DP8473V_TAG":0", fd2000_floppies, "35hd", floppy_image_device::default_floppy_formats, true);//fd2000_device::floppy_formats);
 }
 
@@ -238,7 +238,7 @@ void fd4000_device::device_add_mconfig(machine_config &config)
 {
 	add_common_devices(config);
 	m_maincpu->set_addrmap(AS_PROGRAM, &fd4000_device::fd4000_mem);
-	PC8477A(config, m_fdc, 0);
+	PC8477A(config, m_fdc, 24_MHz_XTAL);
 	FLOPPY_CONNECTOR(config, PC8477AV1_TAG":0", fd4000_floppies, "35hd", floppy_image_device::default_floppy_formats, true);//fd2000_device::floppy_formats);
 }
 

src/devices/bus/cpc/ddi1.cpp

@@ -41,7 +41,7 @@ const tiny_rom_entry *cpc_ddi1_device::device_rom_region() const
 
 // device machine config
 MACHINE_CONFIG_START(cpc_ddi1_device::device_add_mconfig)
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 4'000'000, true, true);
 	MCFG_FLOPPY_DRIVE_ADD("upd765:0", ddi1_floppies, "3ssdd", floppy_image_device::default_floppy_formats)
 	MCFG_SOFTWARE_LIST_ADD("flop_list","cpc_flop")
 

src/devices/bus/epson_sio/pf10.cpp

@@ -70,7 +70,7 @@ MACHINE_CONFIG_START(epson_pf10_device::device_add_mconfig)
 	m_cpu->out_p2_cb().set(FUNC(epson_pf10_device::port2_w));
 	m_cpu->out_ser_tx_cb().set(FUNC(epson_pf10_device::hd6303_tx_w));
 
-	UPD765A(config, m_fdc, false, true);
+	UPD765A(config, m_fdc, 4'000'000, false, true);
 	MCFG_FLOPPY_DRIVE_ADD("upd765a:0", pf10_floppies, "smd165", floppy_image_device::default_floppy_formats)
 
 	MCFG_EPSON_SIO_ADD("sio", nullptr)

src/devices/bus/epson_sio/tf20.cpp

@@ -102,7 +102,7 @@ MACHINE_CONFIG_START(epson_tf20_device::device_add_mconfig)
 	m_mpsc->out_dtra_callback().set(FUNC(epson_tf20_device::dtra_w));
 
 	// floppy disk controller
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, XTAL_CR1, true, true);
 	m_fdc->intrq_wr_callback().set_inputline(m_cpu, INPUT_LINE_IRQ0);
 
 	// floppy drives

src/devices/bus/hexbus/hx5102.cpp

@@ -688,7 +688,7 @@ void hx5102_device::device_add_mconfig(machine_config& config)
 	// Not connected: Select lines (DS0, DS1), Head load (HDL), VCO
 	// Tied to 1: READY
 	// Tied to 0: TC
-	I8272A(config, m_floppy_ctrl, false);
+	I8272A(config, m_floppy_ctrl, 8'000'000, false);
 	m_floppy_ctrl->intrq_wr_callback().set(FUNC(hx5102_device::fdc_irq_w));
 	m_floppy_ctrl->drq_wr_callback().set(FUNC(hx5102_device::fdc_drq_w));
 

src/devices/bus/iq151/disc2.cpp

@@ -74,7 +74,7 @@ void iq151_disc2_device::device_reset()
 
 void iq151_disc2_device::device_add_mconfig(machine_config &config)
 {
-	UPD765A(config, m_fdc, false, true);
+	UPD765A(config, m_fdc, 8'000'000, false, true);
 	FLOPPY_CONNECTOR(config, "fdc:1", iq151_disc2_floppies, "8sssd", iq151_disc2_device::floppy_formats);
 	FLOPPY_CONNECTOR(config, "fdc:2", iq151_disc2_floppies, "8sssd", iq151_disc2_device::floppy_formats);
 }

src/devices/bus/isa/fdc.cpp

@@ -111,7 +111,7 @@ isa8_fdc_smc_device::isa8_fdc_smc_device(const machine_config &mconfig, const ch
 
 void isa8_fdc_smc_device::device_add_mconfig(machine_config &config)
 {
-	smc37c78_device &smc(SMC37C78(config, m_fdc));
+	smc37c78_device &smc(SMC37C78(config, m_fdc, 24'000'000));
 	smc.intrq_wr_callback().set(FUNC(isa8_fdc_device::irq_w));
 	smc.drq_wr_callback().set(FUNC(isa8_fdc_device::drq_w));
 	FLOPPY_CONNECTOR(config, "fdc:0", pc_hd_floppies, "35hd", isa8_fdc_device::floppy_formats);
@@ -124,7 +124,7 @@ isa8_fdc_ps2_device::isa8_fdc_ps2_device(const machine_config &mconfig, const ch
 
 void isa8_fdc_ps2_device::device_add_mconfig(machine_config &config)
 {
-	n82077aa_device &n82077aa(N82077AA(config, m_fdc, n82077aa_device::MODE_PS2));
+	n82077aa_device &n82077aa(N82077AA(config, m_fdc, 24'000'000, n82077aa_device::MODE_PS2));
 	n82077aa.intrq_wr_callback().set(FUNC(isa8_fdc_device::irq_w));
 	n82077aa.drq_wr_callback().set(FUNC(isa8_fdc_device::drq_w));
 	FLOPPY_CONNECTOR(config, "fdc:0", pc_hd_floppies, "35hd", isa8_fdc_device::floppy_formats);
@@ -137,7 +137,7 @@ isa8_fdc_superio_device::isa8_fdc_superio_device(const machine_config &mconfig,
 
 void isa8_fdc_superio_device::device_add_mconfig(machine_config &config)
 {
-	pc_fdc_superio_device &superio(PC_FDC_SUPERIO(config, m_fdc));
+	pc_fdc_superio_device &superio(PC_FDC_SUPERIO(config, m_fdc, 24'000'000));
 	superio.intrq_wr_callback().set(FUNC(isa8_fdc_device::irq_w));
 	superio.drq_wr_callback().set(FUNC(isa8_fdc_device::drq_w));
 	FLOPPY_CONNECTOR(config, "fdc:0", pc_hd_floppies, "35hd", isa8_fdc_device::floppy_formats);

src/devices/bus/isa/mufdc.cpp

@@ -47,7 +47,7 @@ static void drives(device_slot_interface &device)
 
 void mufdc_device::device_add_mconfig(machine_config &config)
 {
-	mcs3201_device &mcs3201(MCS3201(config, m_fdc));
+	mcs3201_device &mcs3201(MCS3201(config, m_fdc, 24_MHz_XTAL));
 	mcs3201.input_handler().set(FUNC(mufdc_device::fdc_input_r));
 	mcs3201.intrq_wr_callback().set(FUNC(mufdc_device::fdc_irq_w));
 	mcs3201.drq_wr_callback().set(FUNC(mufdc_device::fdc_drq_w));

src/devices/bus/isbx/compis_fdc.cpp

@@ -56,7 +56,7 @@ static void compis_floppies(device_slot_interface &device)
 
 void compis_fdc_device::device_add_mconfig(machine_config &config)
 {
-	I8272A(config, m_fdc, true);
+	I8272A(config, m_fdc, 8'000'000, true);
 	m_fdc->intrq_wr_callback().set(FUNC(compis_fdc_device::fdc_irq));
 	m_fdc->drq_wr_callback().set(FUNC(compis_fdc_device::fdc_drq));
 	FLOPPY_CONNECTOR(config, m_floppy0, compis_floppies, "525qd", compis_fdc_device::floppy_formats);

src/devices/bus/isbx/isbc_218a.cpp

@@ -56,7 +56,7 @@ static void isbc_218a_floppies(device_slot_interface &device)
 
 void isbc_218a_device::device_add_mconfig(machine_config &config)
 {
-	I8272A(config, m_fdc, true);
+	I8272A(config, m_fdc, 8_MHz_XTAL, true);
 	m_fdc->intrq_wr_callback().set(FUNC(isbc_218a_device::fdc_irq));
 	m_fdc->drq_wr_callback().set(FUNC(isbc_218a_device::fdc_drq));
 	FLOPPY_CONNECTOR(config, m_floppy0, isbc_218a_floppies, "525dd", isbc_218a_device::floppy_formats);

src/devices/bus/kc/d004.cpp

@@ -152,18 +152,18 @@ void kc_d004_device::device_reset()
 
 void kc_d004_device::device_add_mconfig(machine_config &config)
 {
-	Z80(config, m_cpu, XTAL(8'000'000)/2);
+	Z80(config, m_cpu, 8_MHz_XTAL / 2);
 	m_cpu->set_addrmap(AS_PROGRAM, &kc_d004_device::kc_d004_mem);
 	m_cpu->set_addrmap(AS_IO, &kc_d004_device::kc_d004_io);
 	m_cpu->set_daisy_config(kc_d004_daisy_chain);
 
-	z80ctc_device &ctc(Z80CTC(config, Z80CTC_TAG, XTAL(8'000'000)/2));
+	z80ctc_device &ctc(Z80CTC(config, Z80CTC_TAG, 8_MHz_XTAL / 2));
 	ctc.intr_callback().set_inputline(Z80_TAG, 0);
 	ctc.zc_callback<0>().set(Z80CTC_TAG, FUNC(z80ctc_device::trg1));
 	ctc.zc_callback<1>().set(Z80CTC_TAG, FUNC(z80ctc_device::trg2));
 	ctc.zc_callback<2>().set(Z80CTC_TAG, FUNC(z80ctc_device::trg3));
 
-	UPD765A(config, m_fdc, 0);
+	UPD765A(config, m_fdc, 8_MHz_XTAL);
 	m_fdc->set_ready_line_connected(false);
 	m_fdc->set_select_lines_connected(false);
 	m_fdc->intrq_wr_callback().set(FUNC(kc_d004_device::fdc_irq));

src/devices/bus/msx_cart/disk.cpp

@@ -232,7 +232,7 @@ MACHINE_CONFIG_END
 
 
 MACHINE_CONFIG_START(msx_cart_fsfd1a_device::device_add_mconfig)
-	TC8566AF(config, m_fdc);
+	TC8566AF(config, m_fdc, 16'000'000);
 
 	// Double sided 3.5" floppy drive
 	MCFG_FLOPPY_DRIVE_ADD("fdc:0", msx_floppies, "35dd", msx_cart_disk_device::floppy_formats)

src/devices/bus/newbrain/fdc.cpp

@@ -109,7 +109,7 @@ MACHINE_CONFIG_START(newbrain_fdc_device::device_add_mconfig)
 	MCFG_DEVICE_PROGRAM_MAP(newbrain_fdc_mem)
 	MCFG_DEVICE_IO_MAP(newbrain_fdc_io)
 
-	UPD765A(config, m_fdc, false, true);
+	UPD765A(config, m_fdc, 8'000'000, false, true);
 	m_fdc->intrq_wr_callback().set(FUNC(newbrain_fdc_device::fdc_int_w));
 
 	MCFG_FLOPPY_DRIVE_ADD(UPD765_TAG ":0", newbrain_floppies, "525dd", floppy_image_device::default_floppy_formats)

src/devices/bus/spc1000/fdd.cpp

@@ -95,7 +95,7 @@ void spc1000_fdd_exp_device::device_add_mconfig(machine_config &config)
 	m_ppi->out_pc_callback().set(FUNC(spc1000_fdd_exp_device::i8255_c_w));
 
 	// floppy disk controller
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 4'000'000, true, true);
 	m_fdc->intrq_wr_callback().set_inputline(m_cpu, INPUT_LINE_IRQ0);
 
 	// floppy drives

src/devices/machine/fdc37c93x.cpp

@@ -243,7 +243,7 @@ FLOPPY_FORMATS_END
 void fdc37c93x_device::device_add_mconfig(machine_config &config)
 {
 	// floppy disc controller
-	smc37c78_device &fdcdev(SMC37C78(config, floppy_controller_fdcdev));
+	smc37c78_device &fdcdev(SMC37C78(config, floppy_controller_fdcdev, 24'000'000));
 	fdcdev.intrq_wr_callback().set(FUNC(fdc37c93x_device::irq_floppy_w));
 	fdcdev.drq_wr_callback().set(FUNC(fdc37c93x_device::drq_floppy_w));
 	FLOPPY_CONNECTOR(config, "fdc:0", pc_hd_floppies, "35hd", fdc37c93x_device::floppy_formats);

src/devices/machine/pc_fdc.cpp

@@ -75,7 +75,7 @@ void pc_fdc_family_device::dma_w(uint8_t data)
 
 void pc_fdc_family_device::device_add_mconfig(machine_config &config)
 {
-	UPD765A(config, fdc, false, false);
+	UPD765A(config, fdc, 8'000'000, false, false);
 	fdc->intrq_wr_callback().set(FUNC(pc_fdc_family_device::irq_w));
 	fdc->drq_wr_callback().set(FUNC(pc_fdc_family_device::drq_w));
 }

src/devices/machine/pdc.cpp

@@ -264,7 +264,7 @@ void pdc_device::device_add_mconfig(machine_config &config)
 	//MCFG_QUANTUM_PERFECT_CPU(M6502_TAG)
 
 	/* Floppy Disk Controller - uPD765a - NEC D765AC-2 */
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 4'000'000, true, true);
 	m_fdc->intrq_wr_callback().set(FUNC(pdc_device::fdc_irq));
 	m_fdc->drq_wr_callback().set(m_dma8237, FUNC(am9517a_device::dreq0_w)); //.invert();
 

src/devices/machine/upd765.cpp

@@ -46,7 +46,7 @@ DEFINE_DEVICE_TYPE(UPD72065,       upd72065_device,       "upd72065",       "NEC
 DEFINE_DEVICE_TYPE(I82072,         i82072_device,         "i82072",         "Intel 82072 FDC")
 DEFINE_DEVICE_TYPE(SMC37C78,       smc37c78_device,       "smc37c78",       "SMC FDC73C78 FDC")
 DEFINE_DEVICE_TYPE(N82077AA,       n82077aa_device,       "n82077aa",       "Intel N82077AA FDC")
-DEFINE_DEVICE_TYPE(PC_FDC_SUPERIO, pc_fdc_superio_device, "pc_fdc_superio", "PC FDC SUPERIO")
+DEFINE_DEVICE_TYPE(PC_FDC_SUPERIO, pc_fdc_superio_device, "pc_fdc_superio", "Winbond PC FDC Super I/O")
 DEFINE_DEVICE_TYPE(DP8473,         dp8473_device,         "dp8473",         "National Semiconductor DP8473 FDC")
 DEFINE_DEVICE_TYPE(PC8477A,        pc8477a_device,        "pc8477a",        "National Semiconductor PC8477A FDC")
 DEFINE_DEVICE_TYPE(WD37C65C,       wd37c65c_device,       "wd37c65c",       "Western Digital WD37C65C FDC")

src/devices/machine/upd765.h

@@ -379,8 +379,8 @@ protected:
 
 class upd765a_device : public upd765_family_device {
 public:
-	upd765a_device(const machine_config &mconfig, const char *tag, device_t *owner, bool ready, bool select)
+	upd765a_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock, bool ready, bool select)
-		: upd765a_device(mconfig, tag, owner, 0U)
+		: upd765a_device(mconfig, tag, owner, clock)
 	{
 		set_ready_line_connected(ready);
 		set_select_lines_connected(select);
@@ -392,8 +392,8 @@ public:
 
 class upd765b_device : public upd765_family_device {
 public:
-	upd765b_device(const machine_config &mconfig, const char *tag, device_t *owner, bool ready, bool select)
+	upd765b_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock, bool ready, bool select)
-		: upd765b_device(mconfig, tag, owner, 0U)
+		: upd765b_device(mconfig, tag, owner, clock)
 	{
 		set_ready_line_connected(ready);
 		set_select_lines_connected(select);
@@ -405,8 +405,8 @@ public:
 
 class i8272a_device : public upd765_family_device {
 public:
-	i8272a_device(const machine_config &mconfig, const char *tag, device_t *owner, bool ready)
+	i8272a_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock, bool ready)
-		: i8272a_device(mconfig, tag, owner, 0U)
+		: i8272a_device(mconfig, tag, owner, clock)
 	{
 		set_ready_line_connected(ready);
 	}
@@ -417,12 +417,12 @@ public:
 
 class i82072_device : public upd765_family_device {
 public:
-	i82072_device(const machine_config &mconfig, const char *tag, device_t *owner, bool ready)
+	i82072_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock, bool ready)
-		: i82072_device(mconfig, tag, owner)
+		: i82072_device(mconfig, tag, owner, clock)
 	{
 		set_ready_line_connected(ready);
 	}
-	i82072_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 24'000'000);
+	i82072_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
 
 	virtual void map(address_map &map) override;
 
@@ -456,7 +456,7 @@ private:
 
 class smc37c78_device : public upd765_family_device {
 public:
-	smc37c78_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
+	smc37c78_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
 
 	virtual void map(address_map &map) override;
 };
@@ -478,8 +478,8 @@ public:
 
 class n82077aa_device : public upd765_family_device {
 public:
-	n82077aa_device(const machine_config &mconfig, const char *tag, device_t *owner, int mode)
+	n82077aa_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock, int mode)
-		: n82077aa_device(mconfig, tag, owner, 0U)
+		: n82077aa_device(mconfig, tag, owner, clock)
 	{
 		set_mode(mode);
 	}
@@ -490,35 +490,35 @@ public:
 
 class pc_fdc_superio_device : public upd765_family_device {
 public:
-	pc_fdc_superio_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
+	pc_fdc_superio_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
 
 	virtual void map(address_map &map) override;
 };
 
 class dp8473_device : public upd765_family_device {
 public:
-	dp8473_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
+	dp8473_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
 
 	virtual void map(address_map &map) override;
 };
 
 class pc8477a_device : public upd765_family_device {
 public:
-	pc8477a_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
+	pc8477a_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
 
 	virtual void map(address_map &map) override;
 };
 
 class wd37c65c_device : public upd765_family_device {
 public:
-	wd37c65c_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
+	wd37c65c_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
 
 	virtual void map(address_map &map) override;
 };
 
 class mcs3201_device : public upd765_family_device {
 public:
-	mcs3201_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
+	mcs3201_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
 
 	// configuration helpers
 	auto input_handler() { return m_input_handler.bind(); }
@@ -535,7 +535,7 @@ private:
 
 class tc8566af_device : public upd765_family_device {
 public:
-	tc8566af_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
+	tc8566af_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
 
 	virtual void map(address_map &map) override;
 

src/mame/drivers/a5105.cpp

@@ -608,7 +608,7 @@ MACHINE_CONFIG_START(a5105_state::a5105)
 
 	MCFG_CASSETTE_ADD( "cassette" )
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	MCFG_FLOPPY_DRIVE_ADD("upd765a:0", a5105_floppies, "525qd", a5105_state::floppy_formats)
 	MCFG_FLOPPY_DRIVE_ADD("upd765a:1", a5105_floppies, "525qd", a5105_state::floppy_formats)
 	MCFG_FLOPPY_DRIVE_ADD("upd765a:2", a5105_floppies, "525qd", a5105_state::floppy_formats)

src/mame/drivers/alphatro.cpp

@@ -751,7 +751,7 @@ MACHINE_CONFIG_START(alphatro_state::alphatro)
 	WAVE(config, "wave", "cassette").add_route(ALL_OUTPUTS, "mono", 0.25);
 
 	/* Devices */
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 16_MHz_XTAL / 2, true, true); // clocked through SED-9420C
 	m_fdc->intrq_wr_callback().set(FUNC(alphatro_state::fdc_irq_w));
 	m_fdc->drq_wr_callback().set(m_dmac, FUNC(i8257_device::dreq2_w));
 	MCFG_FLOPPY_DRIVE_ADD("fdc:0", alphatro_floppies, "525dd", alphatro_state::floppy_formats)

src/mame/drivers/altos486.cpp

@@ -134,12 +134,12 @@ void altos486_state::altos486_z80_io(address_map &map)
 
 void altos486_state::altos486(machine_config &config)
 {
-	I80186(config, m_maincpu, XTAL(8'000'000));
+	I80186(config, m_maincpu, 32_MHz_XTAL / 4);
 	m_maincpu->set_addrmap(AS_PROGRAM, &altos486_state::altos486_mem);
 	m_maincpu->set_addrmap(AS_IO, &altos486_state::altos486_io);
 	m_maincpu->set_irq_acknowledge_callback("pic8259", FUNC(pic8259_device::inta_cb)); // yes, really
 
-	z80_device &iocpu(Z80(config, "iocpu", XTAL(8'000'000) / 2));
+	z80_device &iocpu(Z80(config, "iocpu", 32_MHz_XTAL / 8));
 	iocpu.set_addrmap(AS_PROGRAM, &altos486_state::altos486_z80_mem);
 	iocpu.set_addrmap(AS_IO, &altos486_state::altos486_z80_io);
 
@@ -150,10 +150,10 @@ void altos486_state::altos486(machine_config &config)
 
 	I8255(config, "ppi8255");
 
-	UPD765A(config, "fdc", false, false);
+	UPD765A(config, "fdc", 32_MHz_XTAL / 4, false, false);
 	FLOPPY_CONNECTOR(config, "fdc:0", altos486_floppies, "525qd", altos486_state::floppy_formats).set_fixed(true);
 
-	z80sio0_device& sio0(Z80SIO0(config, "sio0", 4000000));
+	z80sio0_device& sio0(Z80SIO0(config, "sio0", 32_MHz_XTAL / 8));
 	sio0.out_txda_callback().set("rs232a", FUNC(rs232_port_device::write_txd));
 	sio0.out_dtra_callback().set("rs232a", FUNC(rs232_port_device::write_dtr));
 	sio0.out_rtsa_callback().set("rs232a", FUNC(rs232_port_device::write_rts));
@@ -162,7 +162,7 @@ void altos486_state::altos486(machine_config &config)
 	sio0.out_rtsb_callback().set("rs232b", FUNC(rs232_port_device::write_rts));
 	//sio0.out_int_callback().set(FUNC(altos486_state::sio_interrupt));
 
-	z80sio0_device& sio1(Z80SIO0(config, "sio1", 4000000));
+	z80sio0_device& sio1(Z80SIO0(config, "sio1", 32_MHz_XTAL / 8));
 	sio1.out_txda_callback().set("rs232c", FUNC(rs232_port_device::write_txd));
 	sio1.out_dtra_callback().set("rs232c", FUNC(rs232_port_device::write_dtr));
 	sio1.out_rtsa_callback().set("rs232c", FUNC(rs232_port_device::write_rts));
@@ -171,13 +171,13 @@ void altos486_state::altos486(machine_config &config)
 	sio1.out_rtsb_callback().set("rs232d", FUNC(rs232_port_device::write_rts));
 	//sio1.out_int_callback().set(FUNC(altos486_state::sio_interrupt));
 
-	z80sio0_device& sio2(Z80SIO0(config, "sio2", 4000000));
+	z80sio0_device& sio2(Z80SIO0(config, "sio2", 32_MHz_XTAL / 8));
 	sio2.out_txda_callback().set("rs232_lp", FUNC(rs232_port_device::write_txd));
 	sio2.out_dtra_callback().set("rs232_lp", FUNC(rs232_port_device::write_dtr));
 	sio2.out_rtsa_callback().set("rs232_lp", FUNC(rs232_port_device::write_rts));
 	//sio2.out_int_callback().set(FUNC(altos486_state::sio_interrupt));
 
-	i8274_device& i8274(I8274(config, "i8274", XTAL(16'000'000)/4));
+	i8274_device& i8274(I8274(config, "i8274", 32_MHz_XTAL / 8));
 	i8274.out_txda_callback().set("rs422_wn", FUNC(rs232_port_device::write_txd));
 	i8274.out_dtra_callback().set("rs422_wn", FUNC(rs232_port_device::write_dtr));
 	i8274.out_rtsa_callback().set("rs422_wn", FUNC(rs232_port_device::write_rts));
@@ -215,14 +215,14 @@ void altos486_state::altos486(machine_config &config)
 	rs422_wn.cts_handler().set("i8274", FUNC(z80dart_device::ctsa_w));
 
 	pit8253_device &pit0(PIT8253(config, "pit0", 0));
-	pit0.set_clk<0>(XTAL(22'118'400)/18);
+	pit0.set_clk<0>(XTAL(22'118'400)/18); // FIXME
-	pit0.set_clk<1>(XTAL(22'118'400)/144);
+	pit0.set_clk<1>(XTAL(22'118'400)/144); // FIXME
-	pit0.set_clk<2>(XTAL(22'118'400)/18);
+	pit0.set_clk<2>(XTAL(22'118'400)/18); // FIXME
 
 	pit8253_device &pit1(PIT8253(config, "pit1", 0));
-	pit1.set_clk<0>(XTAL(22'118'400)/18);
+	pit1.set_clk<0>(XTAL(22'118'400)/18); // FIXME
-	pit1.set_clk<1>(XTAL(22'118'400)/144);
+	pit1.set_clk<1>(XTAL(22'118'400)/144); // FIXME
-	pit1.set_clk<2>(XTAL(22'118'400)/18);
+	pit1.set_clk<2>(XTAL(22'118'400)/18); // FIXME
 }
 
 

src/mame/drivers/amstrad.cpp

@@ -985,7 +985,7 @@ MACHINE_CONFIG_END
 
 MACHINE_CONFIG_START(amstrad_state::cpc664)
 	amstrad_base(config);
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 16_MHz_XTAL / 4, true, true);
 	MCFG_FLOPPY_DRIVE_ADD("upd765:0", amstrad_floppies, "3ssdd", floppy_image_device::default_floppy_formats)
 	MCFG_FLOPPY_DRIVE_ADD("upd765:1", amstrad_floppies, "35ssdd", floppy_image_device::default_floppy_formats)
 	MCFG_SOFTWARE_LIST_ADD("flop_list","cpc_flop")
@@ -1003,7 +1003,7 @@ MACHINE_CONFIG_END
 
 MACHINE_CONFIG_START(amstrad_state::cpc6128)
 	amstrad_base(config);
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 16_MHz_XTAL / 4, true, true);
 	MCFG_FLOPPY_DRIVE_ADD("upd765:0", amstrad_floppies, "3ssdd", floppy_image_device::default_floppy_formats)
 	MCFG_FLOPPY_DRIVE_ADD("upd765:1", amstrad_floppies, "35ssdd", floppy_image_device::default_floppy_formats)
 	MCFG_SOFTWARE_LIST_ADD("flop_list","cpc_flop")
@@ -1089,7 +1089,7 @@ MACHINE_CONFIG_START(amstrad_state::cpcplus)
 	MCFG_CASSETTE_INTERFACE("cpc_cass")
 	MCFG_SOFTWARE_LIST_ADD("cass_list","cpc_cass")
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 40_MHz_XTAL / 10, true, true);
 
 	cpcplus_cartslot(config);
 
@@ -1176,7 +1176,7 @@ MACHINE_CONFIG_START(amstrad_state::aleste)
 
 	MCFG_DEVICE_ADD("rtc", MC146818, 4.194304_MHz_XTAL)
 
-	I8272A(config.replace(), m_fdc, true);
+	I8272A(config.replace(), m_fdc, 16_MHz_XTAL / 4, true);
 
 	MCFG_DEVICE_REMOVE("exp")
 	MCFG_DEVICE_ADD("exp", CPC_EXPANSION_SLOT, 0)

src/mame/drivers/amust.cpp

@@ -463,7 +463,7 @@ MACHINE_CONFIG_START(amust_state::amust)
 	crtc.out_hsync_callback().set(FUNC(amust_state::hsync_w));
 	crtc.out_vsync_callback().set(FUNC(amust_state::vsync_w));
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	m_fdc->drq_wr_callback().set(FUNC(amust_state::drq_w));
 	m_fdc->intrq_wr_callback().set(FUNC(amust_state::intrq_w));
 	MCFG_FLOPPY_DRIVE_ADD("fdc:0", amust_floppies, "525qd", floppy_image_device::default_floppy_formats)

src/mame/drivers/apc.cpp

@@ -974,7 +974,7 @@ MACHINE_CONFIG_START(apc_state::apc)
 	NVRAM(config, m_cmos, nvram_device::DEFAULT_ALL_1);
 	UPD1990A(config, m_rtc);
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	m_fdc->intrq_wr_callback().set(m_i8259_s, FUNC(pic8259_device::ir4_w));
 	m_fdc->drq_wr_callback().set(m_dmac, FUNC(am9517a_device::dreq1_w));
 	MCFG_FLOPPY_DRIVE_ADD(m_fdc_connector[0], apc_floppies, "8", apc_floppy_formats)

src/mame/drivers/attache.cpp

@@ -1179,7 +1179,7 @@ MACHINE_CONFIG_START(attache_state::attache)
 	m_dma->out_iow_callback<0>().set(FUNC(attache_state::fdc_dma_w));
 	// m_dma->out_dack_callback<0>().set(FUNC(attache_state::fdc_dack_w));
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8_MHz_XTAL, true, true);
 	m_fdc->intrq_wr_callback().set(m_ctc, FUNC(z80ctc_device::trg3));
 	m_fdc->drq_wr_callback().set(m_dma, FUNC(am9517a_device::dreq0_w)).invert();
 	FLOPPY_CONNECTOR(config, "fdc:0", attache_floppies, "525dd", floppy_image_device::default_floppy_formats);
@@ -1267,7 +1267,7 @@ MACHINE_CONFIG_START(attache816_state::attache816)
 	m_dma->out_iow_callback<0>().set(FUNC(attache_state::fdc_dma_w));
 	// m_dma->out_dack_callback<0>().set(FUNC(attache_state::fdc_dack_w));
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8_MHz_XTAL, true, true);
 	m_fdc->intrq_wr_callback().set(m_ctc, FUNC(z80ctc_device::trg3));
 	m_fdc->drq_wr_callback().set(m_dma, FUNC(am9517a_device::dreq0_w)).invert();
 	FLOPPY_CONNECTOR(config, "fdc:0", attache_floppies, "525dd", floppy_image_device::default_floppy_formats);

src/mame/drivers/ax20.cpp

@@ -149,7 +149,7 @@ MACHINE_CONFIG_START(ax20_state::ax20)
 	MCFG_DEVICE_ADD("gfxdecode", GFXDECODE, "palette", gfx_ax20)
 	MCFG_PALETTE_ADD_MONOCHROME("palette")
 
-	I8272A(config, m_fdc, true);
+	I8272A(config, m_fdc, 8'000'000, true);
 
 	/* Devices */
 	MCFG_FLOPPY_DRIVE_ADD("fdc:0", ax20_floppies, "525dd", isa8_fdc_device::floppy_formats)

src/mame/drivers/bebox.cpp

@@ -222,7 +222,7 @@ void bebox_state::bebox_peripherals(machine_config &config)
 
 	/*MCFG_PCI_BUS_DEVICE(12, nullptr, scsi53c810_pci_read, scsi53c810_pci_write)*/
 
-	SMC37C78(config, m_smc37c78, 0);
+	SMC37C78(config, m_smc37c78, 24'000'000);
 	m_smc37c78->intrq_wr_callback().set(FUNC(bebox_state::fdc_interrupt));
 	m_smc37c78->drq_wr_callback().set(m_dma8237[0], FUNC(am9517a_device::dreq2_w));
 

src/mame/drivers/bw12.cpp

@@ -580,7 +580,7 @@ MACHINE_CONFIG_START(bw12_state::common)
 
 	/* devices */
 	MCFG_TIMER_DRIVER_ADD(FLOPPY_TIMER_TAG, bw12_state, floppy_motor_off_tick)
-	UPD765A(config, m_fdc, false, true);
+	UPD765A(config, m_fdc, 8'000'000, false, true);
 
 	PIA6821(config, m_pia, 0);
 	m_pia->readpa_handler().set(FUNC(bw12_state::pia_pa_r));

src/mame/drivers/czk80.cpp

@@ -190,29 +190,29 @@ void czk80_state::kbd_put(u8 data)
 void czk80_state::czk80(machine_config &config)
 {
 	/* basic machine hardware */
-	Z80(config, m_maincpu, XTAL(16'000'000) / 4);
+	Z80(config, m_maincpu, 16_MHz_XTAL / 4);
 	m_maincpu->set_addrmap(AS_PROGRAM, &czk80_state::czk80_mem);
 	m_maincpu->set_addrmap(AS_IO, &czk80_state::czk80_io);
 	m_maincpu->set_daisy_config(daisy_chain);
 
 	GENERIC_TERMINAL(config, m_terminal, 0);
 	m_terminal->set_keyboard_callback(FUNC(czk80_state::kbd_put));
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8_MHz_XTAL, true, true);
 	FLOPPY_CONNECTOR(config, "fdc:0", czk80_floppies, "525dd", floppy_image_device::default_floppy_formats);
 
-	z80ctc_device& ctc(Z80CTC(config, "ctc", XTAL(16'000'000) / 4));
+	z80ctc_device& ctc(Z80CTC(config, "ctc", 16_MHz_XTAL / 4));
 	ctc.intr_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
 	ctc.zc_callback<0>().set(FUNC(czk80_state::ctc_z0_w));
 	ctc.zc_callback<1>().set(FUNC(czk80_state::ctc_z1_w));
 	ctc.zc_callback<2>().set(FUNC(czk80_state::ctc_z2_w));
 
-	z80dart_device& dart(Z80DART(config, "dart", XTAL(16'000'000) / 4));
+	z80dart_device& dart(Z80DART(config, "dart", 16_MHz_XTAL / 4));
 	//dart.out_txda_callback().set("rs232", FUNC(rs232_port_device::write_txd));
 	//dart.out_dtra_callback().set("rs232", FUNC(rs232_port_device::write_dtr));
 	//dart.out_rtsa_callback().set("rs232", FUNC(rs232_port_device::write_rts));
 	dart.out_int_callback().set_inputline("maincpu", INPUT_LINE_IRQ0);
 
-	z80pio_device& pio(Z80PIO(config, "pio", XTAL(16'000'000)/4));
+	z80pio_device& pio(Z80PIO(config, "pio", 16_MHz_XTAL / 4));
 	pio.out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
 }
 

src/mame/drivers/d6809.cpp

@@ -202,7 +202,7 @@ MACHINE_CONFIG_START(d6809_state::d6809)
 	m_terminal->set_keyboard_callback(FUNC(d6809_state::kbd_put));
 
 	// Floppy
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	//m_fdc->drq_wr_callback().set(m_fdc, FUNC(upd765a_device::dack_w));   // pin not emulated
 	MCFG_FLOPPY_DRIVE_ADD("fdc:0", floppies, "525qd", floppy_image_device::default_floppy_formats)
 	MCFG_FLOPPY_DRIVE_SOUND(true)

src/mame/drivers/dim68k.cpp

@@ -332,7 +332,7 @@ MACHINE_CONFIG_START(dim68k_state::dim68k)
 	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)
 
 	/* Devices */
-	UPD765A(config, "fdc", true, true); // these options unknown
+	UPD765A(config, "fdc", 8'000'000, true, true); // these options unknown
 	MCFG_FLOPPY_DRIVE_ADD("fdc:0", dim68k_floppies, "525hd", floppy_image_device::default_floppy_formats)
 	MCFG_FLOPPY_DRIVE_ADD("fdc:1", dim68k_floppies, "525hd", floppy_image_device::default_floppy_formats)
 

src/mame/drivers/dmv.cpp

@@ -822,7 +822,7 @@ MACHINE_CONFIG_START(dmv_state::dmv)
 	m_dmac->out_iow_callback<3>().set(m_fdc, FUNC(i8272a_device::mdma_w));
 	m_dmac->out_dack_callback<3>().set(FUNC(dmv_state::dmac_dack3));
 
-	I8272A(config, m_fdc, true);
+	I8272A(config, m_fdc, 8'000'000, true);
 	m_fdc->intrq_wr_callback().set(FUNC(dmv_state::fdc_irq));
 	m_fdc->drq_wr_callback().set(m_dmac, FUNC(am9517a_device::dreq3_w));
 	MCFG_FLOPPY_DRIVE_ADD("i8272:0", dmv_floppies, "525dd", dmv_state::floppy_formats)

src/mame/drivers/dps1.cpp

@@ -198,14 +198,14 @@ static void floppies(device_slot_interface &device)
 
 MACHINE_CONFIG_START(dps1_state::dps1)
 	// basic machine hardware
-	Z80(config, m_maincpu, 4000000);
+	Z80(config, m_maincpu, 4_MHz_XTAL);
 	m_maincpu->set_addrmap(AS_PROGRAM, &dps1_state::mem_map);
 	m_maincpu->set_addrmap(AS_IO, &dps1_state::io_map);
 
 	MCFG_MACHINE_RESET_OVERRIDE(dps1_state, dps1)
 
 	/* video hardware */
-	mc2661_device &uart(MC2661(config, "uart", XTAL(5'068'800)));
+	mc2661_device &uart(MC2661(config, "uart", 5.0688_MHz_XTAL)); // Signetics 2651N
 	uart.txd_handler().set("rs232", FUNC(rs232_port_device::write_txd));
 	uart.rts_handler().set("rs232", FUNC(rs232_port_device::write_rts));
 	uart.dtr_handler().set("rs232", FUNC(rs232_port_device::write_dtr));
@@ -219,7 +219,7 @@ MACHINE_CONFIG_START(dps1_state::dps1)
 	AM9519(config, "am9519b", 0);
 
 	// floppy
-	UPD765A(config, m_fdc, false, true);
+	UPD765A(config, m_fdc, 16_MHz_XTAL / 2, false, true);
 	//m_fdc->intrq_wr_callback().set(FUNC(dps1_state::fdc_int_w)); // doesn't appear to be used
 	m_fdc->drq_wr_callback().set(FUNC(dps1_state::fdc_drq_w));
 	MCFG_FLOPPY_DRIVE_ADD("fdc:0", floppies, "floppy0", floppy_image_device::default_floppy_formats)

src/mame/drivers/duet16.cpp

@@ -407,7 +407,7 @@ MACHINE_CONFIG_START(duet16_state::duet16)
 	MCFG_INPUT_MERGER_ANY_HIGH("tmint")
 	MCFG_INPUT_MERGER_OUTPUT_HANDLER(WRITELINE("pic", pic8259_device, ir0_w)) // INT6
 
-	UPD765A(config, m_fdc, true, false);
+	UPD765A(config, m_fdc, 8_MHz_XTAL, true, false);
 	m_fdc->drq_wr_callback().set(m_dmac, FUNC(am9517a_device::dreq0_w));
 	m_fdc->intrq_wr_callback().set(m_pic, FUNC(pic8259_device::ir3_w)); // INT4
 	MCFG_FLOPPY_DRIVE_ADD("fdc:0", duet16_floppies, "525qd", floppy_image_device::default_floppy_formats)

src/mame/drivers/elwro800.cpp

@@ -579,7 +579,7 @@ MACHINE_CONFIG_START(elwro800_state::elwro800)
 
 	MCFG_VIDEO_START_OVERRIDE(elwro800_state, spectrum)
 
-	UPD765A(config, "upd765", true, true);
+	UPD765A(config, "upd765", 8_MHz_XTAL / 2, true, true);
 
 	I8255A(config, m_i8255, 0);
 	m_i8255->in_pa_callback().set_ioport("JOY");

src/mame/drivers/fanucspmg.cpp

@@ -995,7 +995,7 @@ MACHINE_CONFIG_START(fanucspmg_state::fanucspmg)
 	m_pic[1]->out_int_callback().set(m_pic[0], FUNC(pic8259_device::ir7_w));
 	m_pic[1]->in_sp_callback().set_constant(0);
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	m_fdc->intrq_wr_callback().set(m_pic[0], FUNC(pic8259_device::ir3_w));
 	m_fdc->drq_wr_callback().set(m_dmac, FUNC(i8257_device::dreq0_w));
 	MCFG_FLOPPY_DRIVE_ADD(FDC_TAG":0", fanuc_floppies, "525dd", fanucspmg_state::floppy_formats)

src/mame/drivers/fs3216.cpp

@@ -178,7 +178,7 @@ void fs3216_state::fs3216(machine_config &config)
 
 	Z80DART(config, "dart", 44.2368_MHz_XTAL / 8); // Z8470BPS
 
-	UPD765A(config, m_fdc, true, false);
+	UPD765A(config, m_fdc, 16_MHz_XTAL / 2, true, false);
 
 	X2212(config, m_earom);
 

src/mame/drivers/hec2hrp.cpp

@@ -464,7 +464,7 @@ MACHINE_CONFIG_START(hec2hrp_state::hec2mx40)
 	MCFG_DEVICE_ADD("disc2cpu", Z80, 4_MHz_XTAL)
 	MCFG_DEVICE_PROGRAM_MAP(hecdisc2_mem)
 	MCFG_DEVICE_IO_MAP(hecdisc2_io)
-	UPD765A(config, m_upd_fdc, false, true);
+	UPD765A(config, m_upd_fdc, 8'000'000, false, true);
 	m_upd_fdc->intrq_wr_callback().set(FUNC(hec2hrp_state::disc2_fdc_interrupt));
 	m_upd_fdc->drq_wr_callback().set(FUNC(hec2hrp_state::disc2_fdc_dma_irq));
 	MCFG_FLOPPY_DRIVE_ADD(m_upd_connector[0], hector_floppies, "525hd", floppy_image_device::default_floppy_formats)
@@ -504,7 +504,7 @@ MACHINE_CONFIG_START(hec2hrp_state::hec2hrx)
 	MCFG_DEVICE_ADD("disc2cpu", Z80, 4_MHz_XTAL)
 	MCFG_DEVICE_PROGRAM_MAP(hecdisc2_mem)
 	MCFG_DEVICE_IO_MAP(hecdisc2_io)
-	UPD765A(config, m_upd_fdc, false, true);
+	UPD765A(config, m_upd_fdc, 8'000'000, false, true);
 	m_upd_fdc->intrq_wr_callback().set(FUNC(hec2hrp_state::disc2_fdc_interrupt));
 	m_upd_fdc->drq_wr_callback().set(FUNC(hec2hrp_state::disc2_fdc_dma_irq));
 	MCFG_FLOPPY_DRIVE_ADD(m_upd_connector[0], hector_floppies, "525hd", floppy_image_device::default_floppy_formats)
@@ -575,7 +575,7 @@ MACHINE_CONFIG_START(hec2hrp_state::hec2mx80)
 	MCFG_DEVICE_ADD("disc2cpu", Z80, 4_MHz_XTAL)
 	MCFG_DEVICE_PROGRAM_MAP(hecdisc2_mem)
 	MCFG_DEVICE_IO_MAP(hecdisc2_io)
-	UPD765A(config, m_upd_fdc, false, true);
+	UPD765A(config, m_upd_fdc, 8'000'000, false, true);
 	m_upd_fdc->intrq_wr_callback().set(FUNC(hec2hrp_state::disc2_fdc_interrupt));
 	m_upd_fdc->drq_wr_callback().set(FUNC(hec2hrp_state::disc2_fdc_dma_irq));
 	MCFG_FLOPPY_DRIVE_ADD(m_upd_connector[0], hector_floppies, "525hd", floppy_image_device::default_floppy_formats)

src/mame/drivers/hp16500.cpp

@@ -65,7 +65,7 @@ public:
 		m_mlc(*this, "mlc")
 	{ }
 
-	void hp16500(machine_config &config);
+	void hp16500b(machine_config &config);
 	void hp16500a(machine_config &config);
 	void hp1651(machine_config &config);
 	void hp1650(machine_config &config);
@@ -477,7 +477,8 @@ MACHINE_CONFIG_START(hp16500_state::hp16500a)
 	SPEAKER(config, "rspeaker").front_right();
 MACHINE_CONFIG_END
 
-MACHINE_CONFIG_START(hp16500_state::hp16500)
+void hp16500_state::hp16500b(machine_config &config)
+{
 	/* basic machine hardware */
 	M68EC030(config, m_maincpu, 25'000'000);
 	m_maincpu->set_addrmap(AS_PROGRAM, &hp16500_state::hp16500_map);
@@ -498,9 +499,11 @@ MACHINE_CONFIG_START(hp16500_state::hp16500)
 	// later with a 16500b specific keyboard implementation
 	HP_HIL_SLOT(config, "hil1", "mlc", hp_hil_devices, "hp_ipc_kbd");
 
+	//WD37C65C(config, "fdc", 16_MHz_XTAL);
+
 	SPEAKER(config, "lspeaker").front_left();
 	SPEAKER(config, "rspeaker").front_right();
-MACHINE_CONFIG_END
+}
 
 static INPUT_PORTS_START( hp16500 )
 INPUT_PORTS_END
@@ -534,4 +537,4 @@ ROM_END
 COMP( 1989, hp1650b,  0, 0, hp1650,   hp16500, hp16500_state, empty_init, "Hewlett Packard", "HP 1650b",  MACHINE_NOT_WORKING|MACHINE_NO_SOUND)
 COMP( 1989, hp1651b,  0, 0, hp1651,   hp16500, hp16500_state, empty_init, "Hewlett Packard", "HP 1651b",  MACHINE_NOT_WORKING|MACHINE_NO_SOUND)
 COMP( 1991, hp165ka0, 0, 0, hp16500a, hp16500, hp16500_state, empty_init, "Hewlett Packard", "HP 16500a", MACHINE_NOT_WORKING|MACHINE_NO_SOUND)
-COMP( 1991, hp16500b, 0, 0, hp16500,  hp16500, hp16500_state, empty_init, "Hewlett Packard", "HP 16500b", MACHINE_NOT_WORKING|MACHINE_NO_SOUND)
+COMP( 1991, hp16500b, 0, 0, hp16500b, hp16500, hp16500_state, empty_init, "Hewlett Packard", "HP 16500b", MACHINE_NOT_WORKING|MACHINE_NO_SOUND)

src/mame/drivers/ibm6580.cpp

@@ -882,7 +882,7 @@ static void dw_floppies(device_slot_interface &device)
 }
 
 MACHINE_CONFIG_START(ibm6580_state::ibm6580)
-	MCFG_DEVICE_ADD("maincpu", I8086, XTAL(14'745'600)/3)
+	MCFG_DEVICE_ADD("maincpu", I8086, 14.7456_MHz_XTAL / 3)
 	MCFG_DEVICE_PROGRAM_MAP(ibm6580_mem)
 	MCFG_DEVICE_IO_MAP(ibm6580_io)
 	MCFG_DEVICE_IRQ_ACKNOWLEDGE_DEVICE("pic8259", pic8259_device, inta_cb)
@@ -890,7 +890,7 @@ MACHINE_CONFIG_START(ibm6580_state::ibm6580)
 	RAM(config, RAM_TAG).set_default_size("128K").set_extra_options("160K,192K,224K,256K,320K,384K");
 
 	MCFG_SCREEN_ADD("screen", RASTER)
-	MCFG_SCREEN_RAW_PARAMS(XTAL(25'000'000)/2, 833, 0, 640, 428, 0, 400)
+	MCFG_SCREEN_RAW_PARAMS(25_MHz_XTAL / 2, 833, 0, 640, 428, 0, 400)
 	MCFG_SCREEN_UPDATE_DRIVER(ibm6580_state, screen_update)
 	MCFG_SCREEN_PALETTE("palette")
 	MCFG_SCREEN_VBLANK_CALLBACK(WRITELINE(*this, ibm6580_state, vblank_w))
@@ -916,7 +916,7 @@ MACHINE_CONFIG_START(ibm6580_state::ibm6580)
 	m_kbd->out_strobe_handler().set(FUNC(ibm6580_state::kb_strobe_w));
 	m_kbd->out_strobe_handler().append(m_ppi8255, FUNC(i8255_device::pc4_w));
 
-	I8257(config, m_dma8257, XTAL(14'745'600)/3);
+	I8257(config, m_dma8257, 14.7456_MHz_XTAL / 3);
 	m_dma8257->out_hrq_cb().set(FUNC(ibm6580_state::hrq_w));
 	m_dma8257->out_tc_cb().set(m_fdc, FUNC(upd765a_device::tc_line_w));
 	m_dma8257->in_memr_cb().set(FUNC(ibm6580_state::memory_read_byte));
@@ -924,7 +924,7 @@ MACHINE_CONFIG_START(ibm6580_state::ibm6580)
 	m_dma8257->in_ior_cb<0>().set(m_fdc, FUNC(upd765a_device::mdma_r));
 	m_dma8257->out_iow_cb<0>().set(m_fdc, FUNC(upd765a_device::mdma_w));
 
-	UPD765A(config, m_fdc, false, false);
+	UPD765A(config, m_fdc, 24_MHz_XTAL / 3, false, false);
 	m_fdc->intrq_wr_callback().set(FUNC(ibm6580_state::floppy_intrq));
 //  m_fdc->intrq_wr_callback().append(m_pic8259, FUNC(pic8259_device::ir4_w));
 	m_fdc->drq_wr_callback().set(m_dma8257, FUNC(i8257_device::dreq0_w));

src/mame/drivers/ibmpcjr.cpp

@@ -660,7 +660,7 @@ MACHINE_CONFIG_START(pcjr_state::ibmpcjr)
 	MCFG_CASSETTE_ADD( "cassette")
 	MCFG_CASSETTE_DEFAULT_STATE(CASSETTE_PLAY | CASSETTE_MOTOR_DISABLED | CASSETTE_SPEAKER_ENABLED)
 
-	UPD765A(config, m_fdc, false, false);
+	UPD765A(config, m_fdc, 8'000'000, false, false);
 
 	MCFG_FLOPPY_DRIVE_ADD("fdc:0", pcjr_floppies, "525dd", isa8_fdc_device::floppy_formats)
 	MCFG_SLOT_FIXED(true)

src/mame/drivers/kdt6.cpp

@@ -709,7 +709,7 @@ MACHINE_CONFIG_START(kdt6_state::psi98)
 
 	UPD1990A(config, m_rtc);
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	m_fdc->intrq_wr_callback().set("ctc1", FUNC(z80ctc_device::trg0));
 	m_fdc->drq_wr_callback().set(FUNC(kdt6_state::fdc_drq_w));
 	MCFG_FLOPPY_DRIVE_ADD("fdc:0", kdt6_floppies, "fd55f", floppy_image_device::default_floppy_formats)

src/mame/drivers/m5.cpp

@@ -1443,7 +1443,7 @@ MACHINE_CONFIG_START(m5_state::m5)
 	m_ppi->in_pc_callback().set(FUNC(m5_state::ppi_pc_r));
 	m_ppi->out_pc_callback().set(FUNC(m5_state::ppi_pc_w));
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	m_fdc->intrq_wr_callback().set_inputline(m_fd5cpu, INPUT_LINE_IRQ0);
 	MCFG_FLOPPY_DRIVE_ADD(UPD765_TAG ":0", m5_floppies, "525dd", m5_state::floppy_formats)
 

src/mame/drivers/microdec.cpp

@@ -226,7 +226,7 @@ void microdec_state::microdec(machine_config &config)
 	rs232b.dsr_handler().set("uart2", FUNC(i8251_device::write_dsr));
 	rs232b.cts_handler().set("uart2", FUNC(i8251_device::write_cts));
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	m_fdc->intrq_wr_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
 	FLOPPY_CONNECTOR(config, "fdc:0", microdec_floppies, "525hd", floppy_image_device::default_floppy_formats).enable_sound(true);
 	//FLOPPY_CONNECTOR(config, "fdc:1", microdec_floppies, "525hd", floppy_image_device::default_floppy_formats).enable_sound(true);

src/mame/drivers/mikromik.cpp

@@ -490,7 +490,7 @@ MACHINE_CONFIG_START(mm1_state::mm1)
 	m_pit->set_clk<2>(6.144_MHz_XTAL/2/2);
 	m_pit->out_handler<2>().set(FUNC(mm1_state::auxc_w));
 
-	UPD765A(config, m_fdc, /* 16_MHz_XTAL/2/2, */ true, true);
+	UPD765A(config, m_fdc, 16_MHz_XTAL/2, true, true);
 	m_fdc->intrq_wr_callback().set_inputline(m_maincpu, I8085_RST55_LINE);
 	m_fdc->drq_wr_callback().set(m_dmac, FUNC(am9517a_device::dreq3_w));
 	MCFG_FLOPPY_DRIVE_ADD(UPD765_TAG ":0", mm1_floppies, "525qd", mm1_state::floppy_formats)

src/mame/drivers/mpc3000.cpp

@@ -216,7 +216,7 @@ void mpc3000_state::mpc3000(machine_config &config)
 	MCFG_PALETTE_ADD("palette", 2)
 	MCFG_PALETTE_INIT_OWNER(mpc3000_state, mpc3000)
 
-	UPD72065(config, m_fdc, 0, true, true); // TODO: upd72068 supports motor control
+	UPD72065(config, m_fdc, 16_MHz_XTAL, true, true); // clocked by V53 CLKOUT (TODO: upd72068 supports motor control)
 	//m_fdc->intrq_wr_callback().set(m_maincpu, FUNC(v53a_device::ir?_w));
 	//m_fdc->drq_wr_callback().set(m_maincpu, FUNC(v53a_device::drq?_w));
 

src/mame/drivers/msx.cpp

@@ -1310,7 +1310,7 @@ void msx_state::msx_mb8877a(machine_config & config)
 
 void msx_state::msx_tc8566af(machine_config &config)
 {
-	TC8566AF(config, "fdc");
+	TC8566AF(config, "fdc", 16'000'000);
 }
 
 void msx_state::msx_microsol(machine_config &config)

src/mame/drivers/mz3500.cpp

@@ -827,7 +827,7 @@ MACHINE_CONFIG_START(mz3500_state::mz3500)
 	ppi.out_pb_callback().set(FUNC(mz3500_state::mz3500_pb_w));
 	ppi.out_pc_callback().set(FUNC(mz3500_state::mz3500_pc_w));
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	m_fdc->intrq_wr_callback().set_inputline(m_master, INPUT_LINE_IRQ0);
 	MCFG_FLOPPY_DRIVE_ADD("upd765a:0", mz3500_floppies, "525ssdd", floppy_image_device::default_floppy_formats)
 	MCFG_FLOPPY_DRIVE_ADD("upd765a:1", mz3500_floppies, "525ssdd", floppy_image_device::default_floppy_formats)

src/mame/drivers/mz6500.cpp

@@ -170,7 +170,7 @@ MACHINE_CONFIG_START(mz6500_state::mz6500)
 	m_hgdc->set_addrmap(0, &mz6500_state::upd7220_map);
 	m_hgdc->set_display_pixels_callback(FUNC(mz6500_state::hgdc_display_pixels), this);
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8000000, true, true);
 	MCFG_FLOPPY_DRIVE_ADD("upd765:0", mz6500_floppies, "525hd", floppy_image_device::default_floppy_formats)
 	MCFG_FLOPPY_DRIVE_ADD("upd765:1", mz6500_floppies, "525hd", floppy_image_device::default_floppy_formats)
 MACHINE_CONFIG_END

src/mame/drivers/nanos.cpp

@@ -516,7 +516,7 @@ MACHINE_CONFIG_START(nanos_state::nanos)
 	m_pio->out_pb_callback().set(FUNC(nanos_state::port_b_w));
 
 	/* UPD765 */
-	UPD765A(config, m_fdc, false, true);
+	UPD765A(config, m_fdc, 8'000'000, false, true);
 	MCFG_FLOPPY_DRIVE_ADD(m_floppy, nanos_floppies, "525hd", nanos_state::floppy_formats)
 
 	/* internal ram */

src/mame/drivers/nc.cpp

@@ -1483,7 +1483,7 @@ MACHINE_CONFIG_START(nc200_state::nc200)
 	m_uart->rxrdy_handler().set(FUNC(nc200_state::nc200_rxrdy_callback));
 	m_uart->txrdy_handler().set(FUNC(nc200_state::nc200_txrdy_callback));
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	m_fdc->intrq_wr_callback().set(FUNC(nc200_state::nc200_fdc_interrupt));
 	MCFG_FLOPPY_DRIVE_ADD("upd765:0", ibmpc_floppies, "525dd", ibmpc_floppy_formats)
 	MCFG_FLOPPY_DRIVE_ADD("upd765:1", ibmpc_floppies, "525dd", ibmpc_floppy_formats)

src/mame/drivers/olyboss.cpp

@@ -449,7 +449,7 @@ MACHINE_CONFIG_START( olyboss_state::olybossd )
 	AM9519(config, m_uic, 0);
 	m_uic->out_int_callback().set_inputline("maincpu", 0);
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	m_fdc->intrq_wr_callback().set(m_uic, FUNC(am9519_device::ireq2_w)).invert();
 	m_fdc->drq_wr_callback().set(m_dma, FUNC(i8257_device::dreq0_w));
 	FLOPPY_CONNECTOR(config, m_fdd0, bosscd_floppies, "525qd", floppy_image_device::default_floppy_formats);
@@ -515,7 +515,7 @@ MACHINE_CONFIG_START( olyboss_state::bossb85 )
 	PIC8259(config, m_pic, 0);
 	m_pic->out_int_callback().set_inputline(m_maincpu, 0);
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	m_fdc->intrq_wr_callback().set_inputline(m_maincpu, I8085_RST65_LINE);
 	m_fdc->drq_wr_callback().set(m_dma, FUNC(i8257_device::dreq0_w));
 	MCFG_FLOPPY_DRIVE_ADD("fdc:0", bossb_floppies, "525dd", floppy_image_device::default_floppy_formats)

src/mame/drivers/p8k.cpp

@@ -418,7 +418,7 @@ GFXDECODE_END
 
 MACHINE_CONFIG_START(p8k_state::p8k)
 	/* basic machine hardware */
-	z80_device& maincpu(Z80(config, "maincpu", XTAL(4'000'000)));
+	z80_device& maincpu(Z80(config, "maincpu", 16_MHz_XTAL / 4));
 	maincpu.set_daisy_config(p8k_daisy_chain);
 	maincpu.set_addrmap(AS_PROGRAM, &p8k_state::p8k_memmap);
 	maincpu.set_addrmap(AS_IO, &p8k_state::p8k_iomap);
@@ -426,7 +426,7 @@ MACHINE_CONFIG_START(p8k_state::p8k)
 	MCFG_MACHINE_RESET_OVERRIDE(p8k_state,p8k)
 
 	/* peripheral hardware */
-	z80dma_device& dma(Z80DMA(config, "dma", XTAL(4'000'000)));
+	z80dma_device& dma(Z80DMA(config, "dma", 16_MHz_XTAL / 4));
 	dma.out_busreq_callback().set(FUNC(p8k_state::p8k_dma_irq_w));
 	dma.out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
 	dma.in_mreq_callback().set(FUNC(p8k_state::memory_read_byte));
@@ -450,7 +450,7 @@ MACHINE_CONFIG_START(p8k_state::p8k)
 	// Baud Gen 0, Baud Gen 1, Baud Gen 2,
 	ctc1.intr_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
 
-	z80sio_device& sio(Z80SIO(config, "sio", XTAL(4'000'000)));
+	z80sio_device& sio(Z80SIO(config, "sio", 16_MHz_XTAL / 4));
 	sio.out_txdb_callback().set("rs232", FUNC(rs232_port_device::write_txd));
 	sio.out_dtrb_callback().set("rs232", FUNC(rs232_port_device::write_dtr));
 	sio.out_rtsb_callback().set("rs232", FUNC(rs232_port_device::write_rts));
@@ -460,7 +460,7 @@ MACHINE_CONFIG_START(p8k_state::p8k)
 	rs232.rxd_handler().set("sio", FUNC(z80sio_device::rxb_w));
 	rs232.cts_handler().set("sio", FUNC(z80sio_device::ctsb_w));
 
-	z80sio_device& sio1(Z80SIO(config, "sio1", XTAL(4'000'000)));
+	z80sio_device& sio1(Z80SIO(config, "sio1", 16_MHz_XTAL / 4));
 	sio1.out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
 
 	z80pio_device& pio0(Z80PIO(config, "pio0", 1229000));
@@ -473,7 +473,7 @@ MACHINE_CONFIG_START(p8k_state::p8k)
 	m_pio2->out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
 	m_pio2->in_pa_callback().set_ioport("DSW");
 
-	I8272A(config, m_i8272, true);
+	I8272A(config, m_i8272, 16_MHz_XTAL / 8, true);
 	m_i8272->drq_wr_callback().set("dma", FUNC(z80dma_device::rdy_w));
 	MCFG_FLOPPY_DRIVE_ADD("i8272:0", p8k_floppies, "525hd", floppy_image_device::default_floppy_formats)
 	MCFG_FLOPPY_DRIVE_ADD("i8272:1", p8k_floppies, "525hd", floppy_image_device::default_floppy_formats)

src/mame/drivers/pasopia7.cpp

@@ -966,7 +966,7 @@ MACHINE_CONFIG_START(pasopia7_state::p7_base)
 	m_ppi2->in_pc_callback().set(FUNC(pasopia7_state::nmi_reg_r));
 	m_ppi2->out_pc_callback().set(FUNC(pasopia7_state::nmi_reg_w));
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	MCFG_FLOPPY_DRIVE_ADD("fdc:0", pasopia7_floppies, "525hd", floppy_image_device::default_floppy_formats)
 	MCFG_FLOPPY_DRIVE_ADD("fdc:1", pasopia7_floppies, "525hd", floppy_image_device::default_floppy_formats)
 MACHINE_CONFIG_END

src/mame/drivers/pc100.cpp

@@ -667,7 +667,7 @@ MACHINE_CONFIG_START(pc100_state::pc100)
 	//i8251.rts_handler().set("rs232", FUNC(rs232_port_device::write_rts));
 	i8251.rxrdy_handler().set(m_pic, FUNC(pic8259_device::ir1_w));
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	m_fdc->intrq_wr_callback().set(FUNC(pc100_state::irqnmi_w));
 	m_fdc->drq_wr_callback().set(FUNC(pc100_state::drqnmi_w));
 

src/mame/drivers/pc8801.cpp

@@ -2370,7 +2370,7 @@ MACHINE_CONFIG_START(pc8801_state::pc8801)
 	d8255_slave.in_pc_callback().set(FUNC(pc8801_state::fdc_8255_c_r));
 	d8255_slave.out_pc_callback().set(FUNC(pc8801_state::fdc_8255_c_w));
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	m_fdc->intrq_wr_callback().set_inputline(m_fdccpu, INPUT_LINE_IRQ0);
 
 	#if USE_PROPER_I8214

src/mame/drivers/pc88va.cpp

@@ -1648,7 +1648,7 @@ MACHINE_CONFIG_START(pc88va_state::pc88va)
 	m_dmac->in_memr_callback().set(FUNC(pc88va_state::dma_memr_cb));
 	m_dmac->out_memw_callback().set(FUNC(pc88va_state::dma_memw_cb));
 
-	UPD765A(config, m_fdc, false, true);
+	UPD765A(config, m_fdc, 8000000, false, true);
 	m_fdc->intrq_wr_callback().set(FUNC(pc88va_state::fdc_irq));
 	m_fdc->drq_wr_callback().set(FUNC(pc88va_state::fdc_drq));
 	FLOPPY_CONNECTOR(config, m_fdd[0], pc88va_floppies, "525hd", pc88va_state::floppy_formats);

src/mame/drivers/pc9801.cpp

@@ -2351,7 +2351,7 @@ MACHINE_CONFIG_START(pc9801_state::pc9801_common)
 
 	I8251(config, m_sio, 0);
 
-	UPD765A(config, m_fdc_2hd, true, true);
+	UPD765A(config, m_fdc_2hd, 8'000'000, true, true);
 	m_fdc_2hd->intrq_wr_callback().set(m_pic2, FUNC(pic8259_device::ir3_w));
 	m_fdc_2hd->drq_wr_callback().set(m_dmac, FUNC(am9517a_device::dreq2_w)).invert();
 	FLOPPY_CONNECTOR(config, "upd765_2hd:0", pc9801_floppies, "525hd", pc9801_state::floppy_formats);
@@ -2401,7 +2401,7 @@ MACHINE_CONFIG_START(pc9801_state::pc9801)
 	// TODO: maybe force dips to avoid beep error
 	RAM(config, m_ram).set_default_size("640K").set_extra_options("128K,256K,384K,512K");
 
-	UPD765A(config, m_fdc_2dd, false, true);
+	UPD765A(config, m_fdc_2dd, 8'000'000, false, true);
 	m_fdc_2dd->intrq_wr_callback().set(FUNC(pc9801_state::fdc_2dd_irq));
 	m_fdc_2dd->drq_wr_callback().set(m_dmac, FUNC(am9517a_device::dreq3_w)).invert();
 	FLOPPY_CONNECTOR(config, "upd765_2dd:0", pc9801_floppies, "525dd", pc9801_state::floppy_formats);

src/mame/drivers/pcw.cpp

@@ -1261,7 +1261,7 @@ void pcw_state::pcw(machine_config &config)
 	SPEAKER(config, "mono").front_center();
 	BEEP(config, m_beeper, 3750).add_route(ALL_OUTPUTS, "mono", 1.00);
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 4'000'000, true, true);
 	m_fdc->intrq_wr_callback().set(FUNC(pcw_state::pcw_fdc_interrupt));
 
 	FLOPPY_CONNECTOR(config, "upd765:0", pcw_floppies, "3dsdd", floppy_image_device::default_floppy_formats);

src/mame/drivers/pcw16.cpp

@@ -1063,7 +1063,7 @@ MACHINE_CONFIG_START(pcw16_state::pcw16)
 	pc_lpt_device &lpt(PC_LPT(config, "lpt"));
 	lpt.irq_handler().set_inputline(m_maincpu, 0);
 
-	PC_FDC_SUPERIO(config, m_fdc);
+	PC_FDC_SUPERIO(config, m_fdc, 48_MHz_XTAL / 2);
 	m_fdc->intrq_wr_callback().set(FUNC(pcw16_state::fdc_interrupt));
 	MCFG_FLOPPY_DRIVE_ADD("fdc:0", pcw16_floppies, "35hd", pcw16_state::floppy_formats)
 	MCFG_FLOPPY_DRIVE_ADD("fdc:1", pcw16_floppies, "35hd", pcw16_state::floppy_formats)

src/mame/drivers/peoplepc.cpp

@@ -290,7 +290,7 @@ MACHINE_CONFIG_START(peoplepc_state::olypeopl)
 	m_dmac->in_ior_cb<0>().set("upd765", FUNC(upd765a_device::mdma_r));
 	m_dmac->out_iow_cb<0>().set("upd765", FUNC(upd765a_device::mdma_w));
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	m_fdc->intrq_wr_callback().set("pic8259_0", FUNC(pic8259_device::ir2_w));
 	m_fdc->drq_wr_callback().set(m_dmac, FUNC(i8257_device::dreq0_w));
 	MCFG_FLOPPY_DRIVE_ADD("upd765:0", peoplepc_floppies, "525qd", peoplepc_state::floppy_formats)

src/mame/drivers/prof180x.cpp

@@ -253,7 +253,7 @@ MACHINE_CONFIG_START(prof180x_state::prof180x)
 	MCFG_SCREEN_VISIBLE_AREA(0, 640-1, 0, 480-1)
 
 	/* devices */
-	UPD765A(config, FDC9268_TAG, false, true);
+	UPD765A(config, FDC9268_TAG, 8'000'000, false, true);
 	MCFG_FLOPPY_DRIVE_ADD(FDC9268_TAG ":0", prof180x_floppies, "35dd", floppy_image_device::default_floppy_formats)
 	MCFG_FLOPPY_DRIVE_ADD(FDC9268_TAG ":1", prof180x_floppies, "35dd", floppy_image_device::default_floppy_formats)
 	MCFG_FLOPPY_DRIVE_ADD(FDC9268_TAG ":2", prof180x_floppies, "35dd", floppy_image_device::default_floppy_formats)

src/mame/drivers/prof80.cpp

@@ -464,7 +464,7 @@ MACHINE_CONFIG_START(prof80_state::prof80)
 	UPD1990A(config, m_rtc);
 
 	// FDC
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	MCFG_FLOPPY_DRIVE_ADD(UPD765_TAG ":0", prof80_floppies, "525qd", floppy_image_device::default_floppy_formats)
 	MCFG_FLOPPY_DRIVE_ADD(UPD765_TAG ":1", prof80_floppies, "525qd", floppy_image_device::default_floppy_formats)
 	MCFG_FLOPPY_DRIVE_ADD(UPD765_TAG ":2", prof80_floppies, nullptr,    floppy_image_device::default_floppy_formats)

src/mame/drivers/pwrview.cpp

@@ -420,7 +420,7 @@ MACHINE_CONFIG_START(pwrview_state::pwrview)
 	m_pit->set_clk<2>(XTAL(16'000'000)/16);
 
 	// floppy disk controller
-	UPD765A(config, "fdc", true, true); // Rockwell R7675P
+	UPD765A(config, "fdc", 8'000'000, true, true); // Rockwell R7675P
 	//fdc.intrq_wr_callback().set("pic1", FUNC(pic8259_device::ir6_w));
 	//fdc.drq_wr_callback().set(m_maincpu, FUNC(i80186_cpu_device::drq1_w));
 	MCFG_FLOPPY_DRIVE_ADD("fdc:0", pwrview_floppies, "525dd", floppy_image_device::default_floppy_formats)

src/mame/drivers/pyl601.cpp

@@ -571,7 +571,7 @@ MACHINE_CONFIG_START(pyl601_state::pyl601)
 	crtc.set_char_width(8);   /* ? */
 	crtc.set_update_row_callback(FUNC(pyl601_state::pyl601_update_row), this);
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	MCFG_FLOPPY_DRIVE_ADD("upd765:0", pyl601_floppies, "525hd", pyl601_state::floppy_formats)
 	MCFG_FLOPPY_DRIVE_ADD("upd765:1", pyl601_floppies, "525hd", pyl601_state::floppy_formats)
 	MCFG_SOFTWARE_LIST_ADD("flop_list","pyl601")

src/mame/drivers/qx10.cpp

@@ -809,7 +809,7 @@ MACHINE_CONFIG_START(qx10_state::qx10)
 	MC146818(config, m_rtc, 32.768_kHz_XTAL);
 	m_rtc->irq().set(m_pic_s, FUNC(pic8259_device::ir2_w));
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8'000'000, true, true);
 	m_fdc->intrq_wr_callback().set(FUNC(qx10_state::qx10_upd765_interrupt));
 	m_fdc->drq_wr_callback().set(m_dma_1, FUNC(am9517a_device::dreq0_w)).invert();
 	FLOPPY_CONNECTOR(config, m_floppy[0], qx10_floppies, "525dd", floppy_image_device::default_floppy_formats);

src/mame/drivers/rc702.cpp

@@ -362,7 +362,7 @@ MACHINE_CONFIG_START(rc702_state::rc702)
 	m_dma->out_iow_callback<3>().set("crtc", FUNC(i8275_device::dack_w));
 	m_dma->out_dack_callback<1>().set(FUNC(rc702_state::dack1_w));
 
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, 8_MHz_XTAL, true, true);
 	m_fdc->intrq_wr_callback().set(m_ctc1, FUNC(z80ctc_device::trg3));
 	m_fdc->drq_wr_callback().set(m_dma, FUNC(am9517a_device::dreq1_w));
 	MCFG_FLOPPY_DRIVE_ADD("fdc:0", floppies, "525qd", floppy_image_device::default_floppy_formats)

src/mame/drivers/sage2.cpp

@@ -467,7 +467,7 @@ MACHINE_CONFIG_START(sage2_state::sage2)
 	rs232b.rxd_handler().set(m_usart1, FUNC(i8251_device::write_rxd));
 	rs232b.dsr_handler().set(m_usart1, FUNC(i8251_device::write_dsr));
 
-	UPD765A(config, m_fdc, false, false);
+	UPD765A(config, m_fdc, 8'000'000, false, false);
 	m_fdc->intrq_wr_callback().set(FUNC(sage2_state::fdc_irq));
 
 	MCFG_DEVICE_ADD(m_centronics, CENTRONICS, centronics_devices, "printer")

src/mame/drivers/sg1000.cpp

@@ -649,7 +649,7 @@ MACHINE_CONFIG_START(sf7000_state::sf7000)
 	rs232.rxd_handler().set(UPD8251_TAG, FUNC(i8251_device::write_rxd));
 	rs232.dsr_handler().set(UPD8251_TAG, FUNC(i8251_device::write_dsr));
 
-	UPD765A(config, m_fdc, false, false);
+	UPD765A(config, m_fdc, 8'000'000, false, false);
 	MCFG_FLOPPY_DRIVE_ADD(UPD765_TAG ":0", sf7000_floppies, "3ssdd", sf7000_state::floppy_formats)
 
 	MCFG_DEVICE_ADD(m_centronics, CENTRONICS, centronics_devices, "printer")

src/mame/drivers/specpls3.cpp

@@ -389,7 +389,7 @@ MACHINE_CONFIG_START(spectrum_state::spectrum_plus3)
 
 	MCFG_MACHINE_RESET_OVERRIDE(spectrum_state, spectrum_plus3 )
 
-	UPD765A(config, m_upd765, true, true);
+	UPD765A(config, m_upd765, 4'000'000, true, true);
 	MCFG_FLOPPY_DRIVE_ADD("upd765:0", specpls3_floppies, "3ssdd", floppy_image_device::default_floppy_formats)
 	MCFG_FLOPPY_DRIVE_ADD("upd765:1", specpls3_floppies, "3ssdd", floppy_image_device::default_floppy_formats)
 

src/mame/drivers/tandy2k.cpp

@@ -851,7 +851,7 @@ MACHINE_CONFIG_START(tandy2k_state::tandy2k)
 	PIC8259(config, m_pic1, 0);
 	m_pic1->out_int_callback().set(m_maincpu, FUNC(i80186_cpu_device::int1_w));
 
-	I8272A(config, m_fdc, true);
+	I8272A(config, m_fdc, 16_MHz_XTAL / 4, true);
 	m_fdc->set_select_lines_connected(true);
 	m_fdc->intrq_wr_callback().set(m_pic0, FUNC(pic8259_device::ir4_w));
 	m_fdc->drq_wr_callback().set(FUNC(tandy2k_state::fdc_drq_w));

src/mame/drivers/tim011.cpp

@@ -140,8 +140,8 @@ MACHINE_CONFIG_START(tim011_state::tim011)
 
 //  MCFG_DEVICE_ADD("keyboard",CDP1802, XTAL(1'750'000)) // CDP1802, unknown clock
 
-	// FDC9266 location U43 XTAL(8'000'000)
+	// FDC9266 location U43
-	UPD765A(config, m_fdc, true, true);
+	UPD765A(config, m_fdc, XTAL(8'000'000), true, true);
 	m_fdc->intrq_wr_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ2);
 
 	/* floppy drives */

src/mame/drivers/wangpc.cpp

@@ -1327,7 +1327,7 @@ MACHINE_CONFIG_START(wangpc_state::wangpc)
 	m_epci->dtr_handler().set(RS232_TAG, FUNC(rs232_port_device::write_dtr));
 	m_epci->txemt_dschg_handler().set(FUNC(wangpc_state::epci_irq_w));
 
-	UPD765A(config, m_fdc, false, false);
+	UPD765A(config, m_fdc, 8'000'000, false, false);
 	m_fdc->intrq_wr_callback().set(FUNC(wangpc_state::fdc_irq));
 	m_fdc->drq_wr_callback().set(FUNC(wangpc_state::fdc_drq));
 	MCFG_FLOPPY_DRIVE_ADD(UPD765_TAG ":0", wangpc_floppies, "525dd", wangpc_state::floppy_formats)

src/mame/drivers/x68k.cpp

@@ -1616,7 +1616,7 @@ MACHINE_CONFIG_START(x68k_state::x68000_base)
 	FILTER_VOLUME(config, m_adpcm_out[0]).add_route(ALL_OUTPUTS, "lspeaker", 1.0);
 	FILTER_VOLUME(config, m_adpcm_out[1]).add_route(ALL_OUTPUTS, "rspeaker", 1.0);
 
-	UPD72065(config, m_upd72065, 0, true, false);
+	UPD72065(config, m_upd72065, 16_MHz_XTAL / 2, true, false); // clocked through SED9420CAC
 	m_upd72065->intrq_wr_callback().set(FUNC(x68k_state::fdc_irq));
 	m_upd72065->drq_wr_callback().set(m_hd63450, FUNC(hd63450_device::drq0_w));
 	FLOPPY_CONNECTOR(config, "upd72065:0", x68k_floppies, "525hd", x68k_state::floppy_formats);

src/mame/machine/ibm6580_fdc.cpp

@@ -31,7 +31,7 @@ const tiny_rom_entry *dw_fdc_device::device_rom_region() const
 
 void dw_fdc_device::device_add_mconfig(machine_config &config)
 {
-	I8048(config, m_mcu, XTAL(24'000'000)/4);    // divisor is unverified
+	I8048(config, m_mcu, 24_MHz_XTAL / 4);    // divisor is unverified
 //  m_mcu->bus_in_cb().set(FUNC(dw_fdc_device::bus_r));
 //  m_mcu->bus_out_cb().set(FUNC(dw_fdc_device::bus_w));
 	m_mcu->p1_out_cb().set(FUNC(dw_fdc_device::p1_w));
@@ -41,7 +41,7 @@ void dw_fdc_device::device_add_mconfig(machine_config &config)
 
 	I8255(config, "ppi8255", 0);
 
-	UPD765A(config, "upd765", false, false);
+	UPD765A(config, "upd765", 24_MHz_XTAL / 3, false, false);
 //  m_upd_fdc->intrq_wr_callback().set("pic8259", FUNC(pic8259_device::ir4_w));
 //  m_upd_fdc->drq_wr_callback().set("dma8257", FUNC(dma8257_device::XXX));
 //  MCFG_FLOPPY_DRIVE_ADD(UPD765_TAG ":0", wangpc_floppies, "525dd", wangpc_state::floppy_formats)

src/mame/machine/isbc_208.cpp

@@ -41,7 +41,7 @@ void isbc_208_device::device_add_mconfig(machine_config &config)
 	m_dmac->in_ior_callback<0>().set(m_fdc, FUNC(i8272a_device::mdma_r));
 	m_dmac->out_iow_callback<0>().set(m_fdc, FUNC(i8272a_device::mdma_w));
 
-	I8272A(config, m_fdc, true);
+	I8272A(config, m_fdc, 8_MHz_XTAL, true);
 	m_fdc->intrq_wr_callback().set(FUNC(isbc_208_device::irq_w));
 	m_fdc->drq_wr_callback().set(m_dmac, FUNC(am9517a_device::dreq0_w));
 	FLOPPY_CONNECTOR(config, "fdc:0", isbc_208_floppies, "525dd", isbc_208_device::floppy_formats);