mirror of
https://github.com/holub/mame
synced 2025-05-23 22:20:01 +03:00
346 lines
7.5 KiB
C
346 lines
7.5 KiB
C
/**********************************************************************
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IDE64 v4.1 cartridge emulation
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Copyright MESS Team.
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Visit http://mamedev.org for licensing and usage restrictions.
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**********************************************************************/
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/*
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TODO:
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- fast loader does not work with 1541
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- IDE unknown command (E8)
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- FT245 USB
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- CompactFlash slot
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- ShortBus (ETH64, DUART, DigiMAX, ETFE)
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- clock port (ETH64 II, RR-Net, SilverSurfer, MP3@64)
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*/
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#include "c64_ide64.h"
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//**************************************************************************
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// MACROS/CONSTANTS
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//**************************************************************************
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#define AT29C010A_TAG "u3"
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#define DS1302_TAG "u4"
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#define FT245R_TAG "u21"
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#define IDE_TAG "ide"
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//**************************************************************************
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// DEVICE DEFINITIONS
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//**************************************************************************
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const device_type C64_IDE64 = &device_creator<c64_ide64_cartridge_device>;
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//-------------------------------------------------
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// MACHINE_CONFIG_FRAGMENT( c64_ide64 )
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//-------------------------------------------------
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static MACHINE_CONFIG_FRAGMENT( c64_ide64 )
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MCFG_ATMEL_29C010_ADD(AT29C010A_TAG)
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MCFG_DS1302_ADD(DS1302_TAG, XTAL_32_768kHz)
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MCFG_IDE_CONTROLLER_ADD(IDE_TAG, ide_image_devices, "hdd", "hdd", false)
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MACHINE_CONFIG_END
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//-------------------------------------------------
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// machine_config_additions - device-specific
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// machine configurations
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//-------------------------------------------------
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machine_config_constructor c64_ide64_cartridge_device::device_mconfig_additions() const
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{
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return MACHINE_CONFIG_NAME( c64_ide64 );
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}
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//-------------------------------------------------
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// INPUT_PORTS( c64_ide64 )
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//-------------------------------------------------
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static INPUT_PORTS_START( c64_ide64 )
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PORT_START("JP1")
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PORT_DIPNAME( 0x01, 0x01, "Flash ROM Write Protect" )
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PORT_DIPSETTING( 0x00, "Disabled" )
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PORT_DIPSETTING( 0x01, "Enabled" )
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INPUT_PORTS_END
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//-------------------------------------------------
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// input_ports - device-specific input ports
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//-------------------------------------------------
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ioport_constructor c64_ide64_cartridge_device::device_input_ports() const
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{
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return INPUT_PORTS_NAME( c64_ide64 );
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}
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//**************************************************************************
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// LIVE DEVICE
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//**************************************************************************
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//-------------------------------------------------
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// c64_ide64_cartridge_device - constructor
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//-------------------------------------------------
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c64_ide64_cartridge_device::c64_ide64_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
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device_t(mconfig, C64_IDE64, "C64 IDE64 cartridge", tag, owner, clock, "c64_ide64", __FILE__),
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device_c64_expansion_card_interface(mconfig, *this),
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m_flash_rom(*this, AT29C010A_TAG),
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m_rtc(*this, DS1302_TAG),
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m_ide(*this, IDE_TAG),
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m_jp1(*this, "JP1")
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{
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}
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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void c64_ide64_cartridge_device::device_start()
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{
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// allocate memory
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c64_ram_pointer(machine(), 0x8000);
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// state saving
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save_item(NAME(m_bank));
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save_item(NAME(m_ide_data));
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save_item(NAME(m_enable));
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}
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//-------------------------------------------------
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// device_reset - device-specific reset
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//-------------------------------------------------
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void c64_ide64_cartridge_device::device_reset()
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{
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m_bank = 0;
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m_enable = 1;
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m_wp = m_jp1->read();
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m_game = !m_wp;
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m_exrom = !m_wp;
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}
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//-------------------------------------------------
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// c64_cd_r - cartridge data read
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//-------------------------------------------------
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UINT8 c64_ide64_cartridge_device::c64_cd_r(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2)
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{
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if (!m_enable) return data;
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int rom_oe = 1, ram_oe = 1;
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if (!m_game && m_exrom && sphi2 && ba)
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{
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if (offset >= 0x1000 && offset < 0x8000)
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{
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ram_oe = 0;
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}
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else if (offset >= 0x8000 && offset < 0xc000)
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{
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rom_oe = 0;
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}
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else if (offset >= 0xc000 && offset < 0xd000)
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{
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ram_oe = 0;
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}
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}
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if (!roml || !romh)
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{
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rom_oe = 0;
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}
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if (!io1 && sphi2 && ba)
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{
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// 0x20-0x2f IDE
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// 0x30-0x37 I/O
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// 0x5d-0x5e FT245
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// 0x5f-0x5f DS1302
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// 0x60-0xff ROM
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UINT8 io1_offset = offset & 0xff;
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if (io1_offset >= 0x20 && io1_offset < 0x30)
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{
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m_ide_data = ide_bus_r(m_ide, BIT(offset, 3), offset & 0x07);
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data = m_ide_data & 0xff;
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}
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else if (io1_offset == 0x31)
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{
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data = m_ide_data >> 8;
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}
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else if (io1_offset == 0x32)
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{
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/*
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bit description
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0 EXROM
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1 GAME
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2 A14
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3 A15
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4 A16
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5 v4.x
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6
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7
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*/
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data = 0x20 | (m_bank << 2) | (m_game << 1) | m_exrom;
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}
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else if (io1_offset == 0x5f)
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{
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m_rtc->sclk_w(0);
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data &= ~0x01;
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data |= m_rtc->io_r();
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m_rtc->sclk_w(1);
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}
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else if (io1_offset >= 0x60)
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{
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rom_oe = 0;
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}
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}
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if (!rom_oe)
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{
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offs_t addr = (m_bank << 14) | (offset & 0x3fff);
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data = m_flash_rom->read(addr);
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}
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else if (!ram_oe)
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{
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data = m_ram[offset & 0x7fff];
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}
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return data;
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}
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//-------------------------------------------------
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// c64_cd_w - cartridge data write
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//-------------------------------------------------
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void c64_ide64_cartridge_device::c64_cd_w(address_space &space, offs_t offset, UINT8 data, int sphi2, int ba, int roml, int romh, int io1, int io2)
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{
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if (!m_enable) return;
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if (!m_game && m_exrom)
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{
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if (offset >= 0x1000 && offset < 0x8000)
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{
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m_ram[offset & 0x7fff] = data;
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}
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else if (offset >= 0xc000 && offset < 0xd000)
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{
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m_ram[offset & 0x7fff] = data;
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}
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}
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if ((offset >= 0x8000 && offset < 0xc000) && !m_wp)
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{
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offs_t addr = (m_bank << 14) | (offset & 0x3fff);
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m_flash_rom->write(addr, data);
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}
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if (!io1)
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{
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// 0x20-0x2f IDE
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// 0x30-0x37 I/O
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// 0x5d-0x5e FT245
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// 0x5f-0x5f DS1302
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// 0x60-0xff ROM
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UINT8 io1_offset = offset & 0xff;
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if (io1_offset >= 0x20 && io1_offset < 0x30)
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{
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m_ide_data = (m_ide_data & 0xff00) | data;
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ide_bus_w(m_ide, BIT(offset, 3), offset & 0x07, m_ide_data);
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}
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else if (io1_offset == 0x31)
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{
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m_ide_data = (data << 8) | (m_ide_data & 0xff);
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}
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else if (io1_offset == 0x5f)
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{
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m_rtc->sclk_w(0);
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m_rtc->io_w(BIT(data, 0));
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m_rtc->sclk_w(1);
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}
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else if (io1_offset >= 0x60 && io1_offset < 0x68)
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{
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m_bank = offset & 0x07;
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}
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else if (io1_offset == 0xfb)
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{
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/*
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bit description
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0 disable cartridge
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1 RTC CE
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2
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3
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4
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5
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6
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7
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*/
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m_enable = !BIT(data, 0);
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m_rtc->ce_w(BIT(data, 1));
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}
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else if (io1_offset >= 0xfc)
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{
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m_game = BIT(offset, 0);
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m_exrom = BIT(offset, 1);
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}
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}
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}
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//-------------------------------------------------
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// c64_game_r - GAME read
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//-------------------------------------------------
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int c64_ide64_cartridge_device::c64_game_r(offs_t offset, int sphi2, int ba, int rw, int hiram)
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{
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return (sphi2 && ba) ? m_game : 1;
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}
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//-------------------------------------------------
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// c64_exrom_r - EXROM read
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//-------------------------------------------------
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int c64_ide64_cartridge_device::c64_exrom_r(offs_t offset, int sphi2, int ba, int rw, int hiram)
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{
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return (sphi2 && ba) ? m_exrom : 1;
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}
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