// license:BSD-3-Clause // copyright-holders:Carl #include "m20_8086.h" #include "machine/ram.h" const device_type M20_8086 = &device_creator; m20_8086_device::m20_8086_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, M20_8086, "Olivetti M20 8086 Adapter", tag, owner, clock, "m20_8086", __FILE__), m_8086(*this, "8086"), m_maincpu(*this, ":maincpu"), m_pic(*this, ":i8259"), m_8086_halt(true) { } void m20_8086_device::device_start() { UINT8* ram = machine().device("ram")->pointer(); m_8086->space(AS_PROGRAM).install_readwrite_bank(0x00000, machine().device("ram")->size() - 0x4001, "mainram"); membank("highram")->set_base(ram); membank("mainram")->set_base(&ram[0x4000]); membank("vram")->set_base(memshare(":p_videoram")->ptr()); membank("vram2")->set_base(memshare(":p_videoram")->ptr()); } void m20_8086_device::device_reset() { m_8086_halt = true; m_nvi = m_vi = 0; m_8086->set_input_line(INPUT_LINE_HALT, ASSERT_LINE); } ROM_START( m20_8086 ) ROM_REGION(0x4000, "8086", 0) ROM_LOAD("apb-1086-2.0.bin", 0x0000, 0x4000, CRC(8c05be93) SHA1(2bb424afd874cc6562e9642780eaac2391308053)) ROM_END const rom_entry *m20_8086_device::device_rom_region() const { return ROM_NAME( m20_8086 ); } static ADDRESS_MAP_START(i86_prog, AS_PROGRAM, 16, m20_8086_device) AM_RANGE(0xe0000, 0xe3fff) AM_RAMBANK("vram2") AM_RANGE(0xf0000, 0xf3fff) AM_RAMBANK("highram") AM_RANGE(0xf4000, 0xf7fff) AM_RAMBANK("vram") AM_RANGE(0xfc000, 0xfffff) AM_ROM AM_REGION("8086",0) ADDRESS_MAP_END static ADDRESS_MAP_START(i86_io, AS_IO, 16, m20_8086_device) AM_RANGE(0x4000, 0x4fff) AM_READWRITE(z8000_io_r, z8000_io_w) AM_RANGE(0x7ffa, 0x7ffd) AM_WRITE(handshake_w) ADDRESS_MAP_END static MACHINE_CONFIG_FRAGMENT( m20_8086 ) MCFG_CPU_ADD("8086", I8086, XTAL_24MHz/3) MCFG_CPU_PROGRAM_MAP(i86_prog) MCFG_CPU_IO_MAP(i86_io) MCFG_CPU_IRQ_ACKNOWLEDGE_DRIVER(m20_8086_device, int_cb) MACHINE_CONFIG_END machine_config_constructor m20_8086_device::device_mconfig_additions() const { return MACHINE_CONFIG_NAME( m20_8086 ); } READ16_MEMBER(m20_8086_device::z8000_io_r) { return m_maincpu->space(AS_IO).read_word(offset << 1, mem_mask); } WRITE16_MEMBER(m20_8086_device::z8000_io_w) { m_maincpu->space(AS_IO).write_word(offset << 1, data, mem_mask); } IRQ_CALLBACK_MEMBER(m20_8086_device::int_cb) { if(m_nvi) { m_nvi = false; m_8086->set_input_line(INPUT_LINE_IRQ0, m_vi ? ASSERT_LINE : CLEAR_LINE); return 0xff; } else return m_pic->acknowledge() << 1; } WRITE_LINE_MEMBER(m20_8086_device::nvi_w) { m_nvi = state; m_8086->set_input_line(INPUT_LINE_IRQ0, (state || m_vi) ? ASSERT_LINE : CLEAR_LINE); } WRITE_LINE_MEMBER(m20_8086_device::vi_w) { m_vi = state; m_8086->set_input_line(INPUT_LINE_IRQ0, (state || m_nvi) ? ASSERT_LINE : CLEAR_LINE); } WRITE16_MEMBER(m20_8086_device::handshake_w) { if(!offset) { m_8086->set_input_line(INPUT_LINE_HALT, ASSERT_LINE); m_maincpu->set_input_line(INPUT_LINE_HALT, CLEAR_LINE); m_maincpu->set_input_line(INPUT_LINE_NMI, PULSE_LINE); m_8086_halt = true; } else { m_8086->set_input_line(INPUT_LINE_HALT, CLEAR_LINE); m_8086->set_input_line(INPUT_LINE_RESET, PULSE_LINE); m_maincpu->set_input_line(INPUT_LINE_HALT, ASSERT_LINE); m_8086_halt = false; } }