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diff --git a/src/devices/bus/a2bus/a2thunderclock.c b/src/devices/bus/a2bus/a2thunderclock.c
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+// license:BSD-3-Clause
+// copyright-holders:R. Belmont
+/*********************************************************************
+
+ a2thunderclock.c
+
+ Implemention of the Thunderware Thunderclock Plus.
+
+
+ PCB Layout: (B1/B2 are batteries)
+ _______________________________________________________________
+ | |
+ | | | | | uPD1990 CD4050 74LS174 74LS132 |
+ | | | | | _ _ _ _ _ |
+ | | | | | | | | | | | | | | | |
+ | | | | | |_| |_| |_| |_| |_| |
+ | B1 B2 74LS08 |
+ | 74LS74 74LS109 74LS126 ____________ 74LS27 |
+ | _ _ _ | | _ |
+ | | | | | | | | 2716 | | | |
+ | |_| |_| |_| |____________| |_| |
+ |______________________________________ _|
+ | |
+ |______________________|
+
+*********************************************************************/
+
+#include "a2thunderclock.h"
+
+/***************************************************************************
+ PARAMETERS
+***************************************************************************/
+
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+
+const device_type A2BUS_THUNDERCLOCK = &device_creator<a2bus_thunderclock_device>;
+
+#define THUNDERCLOCK_ROM_REGION "thunclk_rom"
+#define THUNDERCLOCK_UPD1990_TAG "thunclk_upd"
+
+MACHINE_CONFIG_FRAGMENT( thunderclock )
+ MCFG_UPD1990A_ADD(THUNDERCLOCK_UPD1990_TAG, 1021800, DEVWRITELINE(DEVICE_SELF, a2bus_thunderclock_device, upd_dataout_w), NULL)
+MACHINE_CONFIG_END
+
+ROM_START( thunderclock )
+ ROM_REGION(0x800, THUNDERCLOCK_ROM_REGION, 0)
+ ROM_LOAD( "thunderclock plus rom.bin", 0x0000, 0x0800, CRC(1b99c4e3) SHA1(60f434f5325899d7ea257a6e56e6f53eae65146a) )
+ROM_END
+
+/***************************************************************************
+ FUNCTION PROTOTYPES
+***************************************************************************/
+
+//-------------------------------------------------
+// machine_config_additions - device-specific
+// machine configurations
+//-------------------------------------------------
+
+machine_config_constructor a2bus_thunderclock_device::device_mconfig_additions() const
+{
+ return MACHINE_CONFIG_NAME( thunderclock );
+}
+
+//-------------------------------------------------
+// rom_region - device-specific ROM region
+//-------------------------------------------------
+
+const rom_entry *a2bus_thunderclock_device::device_rom_region() const
+{
+ return ROM_NAME( thunderclock );
+}
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+a2bus_thunderclock_device::a2bus_thunderclock_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source) :
+ device_t(mconfig, type, name, tag, owner, clock, shortname, source),
+ device_a2bus_card_interface(mconfig, *this),
+ m_upd1990ac(*this, THUNDERCLOCK_UPD1990_TAG)
+{
+}
+
+a2bus_thunderclock_device::a2bus_thunderclock_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, A2BUS_THUNDERCLOCK, "ThunderWare ThunderClock Plus", tag, owner, clock, "a2thunpl", __FILE__),
+ device_a2bus_card_interface(mconfig, *this),
+ m_upd1990ac(*this, THUNDERCLOCK_UPD1990_TAG)
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void a2bus_thunderclock_device::device_start()
+{
+ // set_a2bus_device makes m_slot valid
+ set_a2bus_device();
+
+ m_rom = device().machine().root_device().memregion(this->subtag(THUNDERCLOCK_ROM_REGION).c_str())->base();
+
+ save_item(NAME(m_dataout));
+}
+
+void a2bus_thunderclock_device::device_reset()
+{
+ m_dataout = 0;
+}
+
+
+/*-------------------------------------------------
+ read_c0nx - called for reads from this card's c0nx space
+-------------------------------------------------*/
+
+UINT8 a2bus_thunderclock_device::read_c0nx(address_space &space, UINT8 offset)
+{
+ return (m_dataout << 7);
+}
+
+
+/*-------------------------------------------------
+ write_c0nx - called for writes to this card's c0nx space
+-------------------------------------------------*/
+
+void a2bus_thunderclock_device::write_c0nx(address_space &space, UINT8 offset, UINT8 data)
+{
+ // uPD1990AC hookup:
+ // bit 0 = DATA IN?
+ // bit 1 = CLK
+ // bit 2 = STB
+ // bit 3 = C0
+ // bit 4 = C1
+ // bit 5 = C2
+ // bit 7 = data out
+ if (offset == 0)
+ {
+ m_upd1990ac->cs_w(1);
+ m_upd1990ac->oe_w(1);
+ m_upd1990ac->data_in_w(data&0x01);
+ m_upd1990ac->c0_w((data&0x08) >> 3);
+ m_upd1990ac->c1_w((data&0x10) >> 4);
+ m_upd1990ac->c2_w((data&0x20) >> 5);
+ m_upd1990ac->stb_w((data&0x04) >> 2);
+ m_upd1990ac->clk_w((data&0x02) >> 1);
+ }
+}
+
+/*-------------------------------------------------
+ read_cnxx - called for reads from this card's cnxx space
+-------------------------------------------------*/
+
+UINT8 a2bus_thunderclock_device::read_cnxx(address_space &space, UINT8 offset)
+{
+ // ROM is primarily a c800 image, but the first page is also the CnXX ROM
+ return m_rom[offset];
+}
+
+/*-------------------------------------------------
+ read_c800 - called for reads from this card's c800 space
+-------------------------------------------------*/
+
+UINT8 a2bus_thunderclock_device::read_c800(address_space &space, UINT16 offset)
+{
+ return m_rom[offset];
+}
+
+WRITE_LINE_MEMBER( a2bus_thunderclock_device::upd_dataout_w )
+{
+ if (state)
+ {
+ m_dataout = 1;
+ }
+ else
+ {
+ m_dataout = 0;
+ }
+}