// license:GPL-2.0+ // copyright-holders:Jonathan Edwards /********************************************************************* bml3mp1802.c Hitachi MP-1802 floppy disk controller card for the MB-6890 Hitachi MP-3550 floppy drive is attached *********************************************************************/ #include "emu.h" #include "bml3mp1802.h" #include "softlist_dev.h" /*************************************************************************** PARAMETERS ***************************************************************************/ //************************************************************************** // GLOBAL VARIABLES //************************************************************************** DEFINE_DEVICE_TYPE(BML3BUS_MP1802, bml3bus_mp1802_device, "bml3mp1802", "Hitachi MP-1802 Floppy Controller Card") static void mp1802_floppies(device_slot_interface &device) { device.option_add("dd", FLOPPY_525_DD); } WRITE_LINE_MEMBER( bml3bus_mp1802_device::bml3_wd17xx_intrq_w ) { if (state) { raise_slot_nmi(); lower_slot_nmi(); } } #define MP1802_ROM_REGION "mp1802_rom" ROM_START( mp1802 ) ROM_REGION(0x10000, MP1802_ROM_REGION, 0) // MP-1802 disk controller ROM, which replaces part of the system ROM ROM_LOAD( "mp1802.rom", 0xf800, 0x800, BAD_DUMP CRC(8d0dc101) SHA1(92f7d1cebecafa7472e45c4999520de5c01c6dbc)) ROM_END /*************************************************************************** FUNCTION PROTOTYPES ***************************************************************************/ //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- void bml3bus_mp1802_device::device_add_mconfig(machine_config &config) { constexpr auto CLK16M = 32.256_MHz_XTAL / 2; MB8866(config, m_fdc, CLK16M / 16); // 16MCLK divided by IC628 (HD74LS93P) m_fdc->intrq_wr_callback().set(FUNC(bml3bus_mp1802_device::bml3_wd17xx_intrq_w)); FLOPPY_CONNECTOR(config, m_floppy0, mp1802_floppies, "dd", floppy_image_device::default_mfm_floppy_formats); FLOPPY_CONNECTOR(config, m_floppy1, mp1802_floppies, "dd", floppy_image_device::default_mfm_floppy_formats); FLOPPY_CONNECTOR(config, m_floppy2, mp1802_floppies, nullptr, floppy_image_device::default_mfm_floppy_formats); FLOPPY_CONNECTOR(config, m_floppy3, mp1802_floppies, nullptr, floppy_image_device::default_mfm_floppy_formats); SOFTWARE_LIST(config, "flop_list").set_original("bml3_flop").set_filter("5"); } //------------------------------------------------- // rom_region - device-specific ROM region //------------------------------------------------- const tiny_rom_entry *bml3bus_mp1802_device::device_rom_region() const { return ROM_NAME( mp1802 ); } uint8_t bml3bus_mp1802_device::bml3_mp1802_r() { return m_fdc->drq_r() ? 0x00 : 0x80; } void bml3bus_mp1802_device::bml3_mp1802_w(uint8_t data) { floppy_image_device *floppy = nullptr; switch (data & 0x03) { case 0: floppy = m_floppy0->get_device(); break; case 1: floppy = m_floppy1->get_device(); break; case 2: floppy = m_floppy2->get_device(); break; case 3: floppy = m_floppy3->get_device(); break; } m_fdc->set_floppy(floppy); if (floppy) { floppy->mon_w(!BIT(data, 3)); floppy->ss_w(BIT(data, 4)); } } //************************************************************************** // LIVE DEVICE //************************************************************************** bml3bus_mp1802_device::bml3bus_mp1802_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : device_t(mconfig, BML3BUS_MP1802, tag, owner, clock), device_bml3bus_card_interface(mconfig, *this), m_fdc(*this, "fdc"), m_floppy0(*this, "fdc:0"), m_floppy1(*this, "fdc:1"), m_floppy2(*this, "fdc:2"), m_floppy3(*this, "fdc:3"), m_rom(nullptr) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void bml3bus_mp1802_device::device_start() { m_rom = memregion(MP1802_ROM_REGION)->base(); // install into memory address_space &space_prg = space(); space_prg.install_readwrite_handler(0xff00, 0xff03, read8sm_delegate(*m_fdc, FUNC(mb8866_device::read)), write8sm_delegate(*m_fdc, FUNC(mb8866_device::write))); space_prg.install_readwrite_handler(0xff04, 0xff04, read8smo_delegate(*this, FUNC(bml3bus_mp1802_device::bml3_mp1802_r)), write8smo_delegate(*this, FUNC(bml3bus_mp1802_device::bml3_mp1802_w))); // overwriting the main ROM (rather than using e.g. install_rom) should mean that bank switches for RAM expansion still work... uint8_t *mainrom = device().machine().root_device().memregion("maincpu")->base(); memcpy(mainrom + 0xf800, m_rom + 0xf800, 0x800); } void bml3bus_mp1802_device::device_reset() { }