// license:BSD-3-Clause // copyright-holders:Olivier Galibert /*************************************************************************** n2a03.cpp 6502, NES variant ***************************************************************************/ #include "emu.h" #include "n2a03.h" #include "n2a03d.h" DEFINE_DEVICE_TYPE(N2A03, n2a03_device, "n2a03", "Ricoh N2A03") READ8_MEMBER(n2a03_device::psg1_4014_r) { return m_apu->read(space, 0x14); } READ8_MEMBER(n2a03_device::psg1_4015_r) { return m_apu->read(space, 0x15); } WRITE8_MEMBER(n2a03_device::psg1_4015_w) { m_apu->write(space, 0x15, data); } WRITE8_MEMBER(n2a03_device::psg1_4017_w) { m_apu->write(space, 0x17, data); } // on various drivers output port 0x4014 is used for external hardware (not used by APU?) // input/output port 0x4016 ^ (not used by APU?) // input port 0x4017 ^ ( APU_IRQCTRL ) // is there a fall through where every write is seen by other hw, or do these addresses really not touch the APU?? APU_IRQCTRL can definitely be written by can it be read back? ADDRESS_MAP_START(n2a03_device::n2a03_map) AM_RANGE(0x4000, 0x4013) AM_DEVREADWRITE("nesapu", nesapu_device, read, write) AM_RANGE(0x4014, 0x4014) AM_READ(psg1_4014_r) // AM_WRITE(sprite_dma_0_w) AM_RANGE(0x4015, 0x4015) AM_READWRITE(psg1_4015_r, psg1_4015_w) /* PSG status / first control register */ //AM_RANGE(0x4016, 0x4016) AM_READWRITE(vsnes_in0_r, vsnes_in0_w) AM_RANGE(0x4017, 0x4017) /*AM_READ(vsnes_in1_r)*/ AM_WRITE(psg1_4017_w) ADDRESS_MAP_END n2a03_device::n2a03_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : m6502_device(mconfig, N2A03, tag, owner, clock) , m_apu(*this, "nesapu") { program_config.m_internal_map = address_map_constructor(FUNC(n2a03_device::n2a03_map), this); } util::disasm_interface *n2a03_device::create_disassembler() { return new n2a03_disassembler; } void n2a03_device::device_start() { if(!m_apu->started()) throw device_missing_dependencies(); m6502_device::device_start(); } void n2a03_device::device_clock_changed() { m_apu->set_unscaled_clock(clock()); } WRITE_LINE_MEMBER(n2a03_device::apu_irq) { // games relying on the APU_IRQ don't seem to work anyway? (nes software list : timelord, mig29sf, firehawk) set_input_line(N2A03_APU_IRQ_LINE, state ? ASSERT_LINE : CLEAR_LINE); } READ8_MEMBER(n2a03_device::apu_read_mem) { return mintf->program->read_byte(offset); } MACHINE_CONFIG_START(n2a03_device::device_add_mconfig) MCFG_SOUND_ADD("nesapu", NES_APU, DERIVED_CLOCK(1,1) ) MCFG_NES_APU_IRQ_HANDLER(WRITELINE(n2a03_device, apu_irq)) MCFG_NES_APU_MEM_READ_CALLBACK(READ8(n2a03_device, apu_read_mem)) MCFG_SOUND_ROUTE(ALL_OUTPUTS, ":mono", 0.50) MACHINE_CONFIG_END #include "cpu/m6502/n2a03.hxx"