// 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 "emu.h" #include "a2thunderclock.h" /*************************************************************************** PARAMETERS ***************************************************************************/ //************************************************************************** // GLOBAL VARIABLES //************************************************************************** const device_type A2BUS_THUNDERCLOCK = &device_creator; #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), NOOP) 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 tiny_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_t 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), m_rom(nullptr), m_dataout(0) { } a2bus_thunderclock_device::a2bus_thunderclock_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t 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), m_rom(nullptr), m_dataout(0) { } //------------------------------------------------- // 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_t a2bus_thunderclock_device::read_c0nx(address_space &space, uint8_t 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_t offset, uint8_t 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_t a2bus_thunderclock_device::read_cnxx(address_space &space, uint8_t 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_t a2bus_thunderclock_device::read_c800(address_space &space, uint16_t offset) { return m_rom[offset]; } WRITE_LINE_MEMBER( a2bus_thunderclock_device::upd_dataout_w ) { if (state) { m_dataout = 1; } else { m_dataout = 0; } }