// license:BSD-3-Clause // copyright-holders:Devin Acker /*************************************************************************** gew7.cpp Yamaha GEW7, GEW7I, GEW7S (65c02-based) ***************************************************************************/ #include "emu.h" #include "gew7.h" #include "m6502mcu.ipp" #include "bus/generic/slot.h" DEFINE_DEVICE_TYPE(GEW7, gew7_device, "gew7", "Yamaha YMW270-F (GEW7)") gew7_device::gew7_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : m6502_mcu_device_base(mconfig, GEW7, tag, owner, clock) , device_mixer_interface(mconfig, *this, 2) , m_in_cb(*this, 0xff), m_out_cb(*this) , m_rom(*this, DEVICE_SELF) , m_bank(*this, "bank%u", 0U) , m_pcm(*this, "pcm") { program_config.m_internal_map = address_map_constructor(FUNC(gew7_device::internal_map), this); std::fill(std::begin(m_port_force_bits), std::end(m_port_force_bits), 0); std::fill(std::begin(m_port_force_mask), std::end(m_port_force_mask), 0); } void gew7_device::device_add_mconfig(machine_config &config) { GEW7_PCM(config, m_pcm, DERIVED_CLOCK(1, 1)); m_pcm->set_device_rom_tag(m_rom); m_pcm->add_route(0, *this, 1.0, AUTO_ALLOC_INPUT, 0); m_pcm->add_route(1, *this, 1.0, AUTO_ALLOC_INPUT, 1); } void gew7_device::device_start() { m6502_mcu_device_base::device_start(); m_bank_mask = device_generic_cart_interface::map_non_power_of_two( unsigned(m_rom->bytes() >> 14), [this, base = &m_rom->as_u8()] (unsigned entry, unsigned page) { m_bank[0]->configure_entry(entry, &base[page << 14]); m_bank[1]->configure_entry(entry, &base[page << 14]); }); m_timer_base[0] = m_timer_base[1] = 0; std::fill(std::begin(m_port_data), std::end(m_port_data), 0); std::fill(std::begin(m_port_ddr), std::end(m_port_ddr), 0); save_item(NAME(m_timer_stat)); save_item(NAME(m_timer_en)); save_item(NAME(m_timer_count)); save_item(NAME(m_timer_base)); save_item(NAME(m_port_data)); save_item(NAME(m_port_ddr)); } void gew7_device::device_reset() { m6502_mcu_device_base::device_reset(); internal_update(); m_timer_stat = m_timer_en = 0; m_timer_count[0] = m_timer_count[1] = 0; internal_update(); } void gew7_device::internal_map(address_map &map) { map(0x0000, 0x005f).rw(m_pcm, FUNC(gew7_pcm_device::read), FUNC(gew7_pcm_device::write)); map(0x0060, 0x00ff).mirror(0x0100).ram(); map(0x0200, 0x022f).rw(m_pcm, FUNC(gew7_pcm_device::read_hi), FUNC(gew7_pcm_device::write_hi)); map(0x0230, 0x023f).ram(); map(0x0400, 0x0400).rw(FUNC(gew7_device::timer_stat_r), FUNC(gew7_device::timer_stat_w)); map(0x0401, 0x0401).w(FUNC(gew7_device::timer_en_w)); map(0x0402, 0x0405).rw(FUNC(gew7_device::timer_count_r), FUNC(gew7_device::timer_count_w)); map(0x0408, 0x0409).w(FUNC(gew7_device::bank_w)); map(0x040a, 0x040f).rw(FUNC(gew7_device::port_r), FUNC(gew7_device::port_w)); map(0x0410, 0x0415).rw(FUNC(gew7_device::port_ddr_r), FUNC(gew7_device::port_ddr_w)); map(0x4000, 0x7fff).bankr(m_bank[0]); map(0x8000, 0xbfff).bankr(m_bank[1]); map(0xc000, 0xffff).rom().region(DEVICE_SELF, 0); } void gew7_device::internal_update(u64 current_time) { u64 event_time(0U); add_event(event_time, timer_update(0, current_time)); add_event(event_time, timer_update(1, current_time)); recompute_bcount(event_time); } u8 gew7_device::timer_stat_r() { internal_update(); return m_timer_stat; } void gew7_device::timer_stat_w(u8 data) { internal_update(); m_timer_stat &= ~data; if (!(m_timer_stat & 3)) set_input_line(W65C02_IRQ_LINE, CLEAR_LINE); internal_update(); } void gew7_device::timer_en_w(u8 data) { internal_update(); m_timer_en = data; internal_update(); } u8 gew7_device::timer_count_r(offs_t offset) { const unsigned timer = offset >> 1; internal_update(); if (!BIT(offset, 0)) return m_timer_count[timer]; else return m_timer_count[timer] >> 8; } void gew7_device::timer_count_w(offs_t offset, u8 data) { const unsigned timer = offset >> 1; internal_update(); if (!BIT(offset, 0)) m_timer_count[timer] = (m_timer_count[timer] & 0xff00) | data; else m_timer_count[timer] = (m_timer_count[timer] & 0x00ff) | (data << 8); internal_update(); } u64 gew7_device::timer_update(int num, u64 current_time) { static constexpr unsigned tick_rate = 48; const u64 ticks = current_time / tick_rate; const u64 elapsed = ticks - m_timer_base[num]; m_timer_base[num] = ticks; if (!BIT(m_timer_en, num)) return 0; // timer disabled if (elapsed > m_timer_count[num]) { m_timer_stat |= (1 << num); set_input_line(W65C02_IRQ_LINE, ASSERT_LINE); } m_timer_count[num] -= elapsed; return (m_timer_base[num] + m_timer_count[num] + 1) * tick_rate; } void gew7_device::bank_w(offs_t offset, u8 data) { m_bank[offset]->set_entry(data & m_bank_mask); } void gew7_device::port_force_bits(offs_t num, u8 bits, u8 mask) { // Evidently (at least on the original YMW270F), tying a port pin to +5V or ground is expected // to affect the value read from the port even when the pin is configured as output. // PSS-11, PSS-21, PSS-31, and PSR-75 (which all use the same ROM) all rely on this in order to // correctly detect what model they are. m_port_force_bits[num] = bits; m_port_force_mask[num] = mask; } u8 gew7_device::port_r(offs_t offset) { const u8 out_data = m_port_data[offset] & m_port_ddr[offset]; const u8 in_data = m_in_cb[offset]() & ~m_port_ddr[offset]; return ((out_data | in_data) & ~m_port_force_mask[offset]) | m_port_force_bits[offset]; } void gew7_device::port_w(offs_t offset, u8 data) { m_port_data[offset] = data; m_out_cb[offset](0, m_port_data[offset], m_port_ddr[offset]); } u8 gew7_device::port_ddr_r(offs_t offset) { return m_port_ddr[offset]; } void gew7_device::port_ddr_w(offs_t offset, u8 data) { m_port_ddr[offset] = data; m_out_cb[offset](0, m_port_data[offset], m_port_ddr[offset]); }