// license:BSD-3-Clause // copyright-holders:AJR /*********************************************************************************************************************************** Ziatech ZT-8802 single-board computer. Advert says: V40 CPU @ 8MHz, 1MB DRAM, 512K EPROM, 3 RS-232 PORTS. CPU is NEC D70208L-10 (V40) which is a V20 with 8251,8253,8259 included. Chips: Maxim MAX249CQH, Exar XT16C452CJPS, Ziatech ICPSMCI-16C49A, 2x GAL22V10D, 2x ACT15245, 2x ACT11245, ACT11240, PALCE 16V??-15JC, 2x CYM1465LPD-120C (RAM). Other: A 3.6volt battery, a tiny crystal, a red LED, and about 2 dozen jumpers. ************************************************************************************************************************************/ #include "emu.h" #include "cpu/nec/v5x.h" #include "machine/ds1302.h" class zt8802_state : public driver_device { public: zt8802_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag) , m_maincpu(*this, "maincpu") , m_pia(*this, "pia") , m_rtc(*this, "rtc") { } void zt8802(machine_config &config); private: void pia_w(offs_t offset, u8 data); u8 rtc_r(); void rtc_w(u8 data); void mem_map(address_map &map); void io_map(address_map &map); required_device m_maincpu; required_shared_ptr m_pia; required_device m_rtc; }; void zt8802_state::pia_w(offs_t offset, u8 data) { if (offset == 5) m_rtc->ce_w(BIT(data, 4)); m_pia[offset] = data; } u8 zt8802_state::rtc_r() { if (!machine().side_effects_disabled()) m_rtc->sclk_w(0); u8 data = m_rtc->io_r(); if (!machine().side_effects_disabled()) m_rtc->sclk_w(1); return data; } void zt8802_state::rtc_w(u8 data) { m_rtc->sclk_w(0); m_rtc->io_w(BIT(data, 0)); m_rtc->sclk_w(1); } void zt8802_state::mem_map(address_map &map) { map(0x00000, 0x7ffff).ram(); map(0x80000, 0xfffff).rom().region("roms", 0); } void zt8802_state::io_map(address_map &map) { map(0x0080, 0x0080).nopr(); // watchdog? map(0xfa00, 0xfa07).ram().share("pia").w(FUNC(zt8802_state::pia_w)); //.rw("pia", FUNC(zt16c49_device::read), FUNC(zt16c49_device::write)); map(0xfa80, 0xfa80).rw(FUNC(zt8802_state::rtc_r), FUNC(zt8802_state::rtc_w)); } static INPUT_PORTS_START( zt8802 ) INPUT_PORTS_END void zt8802_state::zt8802(machine_config &config) { V40(config, m_maincpu, 16'000'000); m_maincpu->set_addrmap(AS_PROGRAM, &zt8802_state::mem_map); m_maincpu->set_addrmap(AS_IO, &zt8802_state::io_map); DS1202(config, m_rtc, 32'768); } ROM_START( zt8802 ) ROM_REGION( 0x80000, "roms", 0 ) ROM_LOAD( "c103207-218 a.rom", 0x00000, 0x80000, CRC(fc1c6e99) SHA1(cfbb2f0c9927bac5abc85c12d2b82f7da46cab03) ) ROM_END COMP( 1994, zt8802, 0, 0, zt8802, zt8802, zt8802_state, empty_init, "Ziatech", "ZT-8802 SBC", MACHINE_IS_SKELETON )