diff options
Diffstat (limited to 'src/mess/machine/c64_ide64.c')
-rw-r--r-- | src/mess/machine/c64_ide64.c | 325 |
1 files changed, 325 insertions, 0 deletions
diff --git a/src/mess/machine/c64_ide64.c b/src/mess/machine/c64_ide64.c new file mode 100644 index 00000000000..81d53642fc2 --- /dev/null +++ b/src/mess/machine/c64_ide64.c @@ -0,0 +1,325 @@ +/********************************************************************** + + IDE64 v4.1 cartridge emulation + + Copyright MESS Team. + Visit http://mamedev.org for licensing and usage restrictions. + +**********************************************************************/ + +/* + + TODO: + + - fast loader does not work with 1541 + - graphics corruption during Ultimax mode (VIC issue?) + - IDE unknown command (E8) + - FT245 USB + - CompactFlash slot + - ShortBus (ETH64, DUART, DigiMAX, ETFE) + - clock port (ETH64 II, RR-Net, SilverSurfer, MP3@64) + +*/ + +#include "c64_ide64.h" + + + +//************************************************************************** +// MACROS/CONSTANTS +//************************************************************************** + +#define AT29C010A_TAG "u3" +#define DS1302_TAG "u4" +#define FT245R_TAG "u21" +#define IDE_TAG "ide" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type C64_IDE64 = &device_creator<c64_ide64_cartridge_device>; + + +//------------------------------------------------- +// MACHINE_CONFIG_FRAGMENT( c64_ide64 ) +//------------------------------------------------- + +static MACHINE_CONFIG_FRAGMENT( c64_ide64 ) + MCFG_ATMEL_29C010_ADD(AT29C010A_TAG) + MCFG_DS1302_ADD(DS1302_TAG, XTAL_32_768kHz) + + MCFG_IDE_CONTROLLER_ADD(IDE_TAG, NULL, ide_image_devices, "hdd", "hdd", false) +MACHINE_CONFIG_END + + +//------------------------------------------------- +// machine_config_additions - device-specific +// machine configurations +//------------------------------------------------- + +machine_config_constructor c64_ide64_cartridge_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( c64_ide64 ); +} + + +//------------------------------------------------- +// INPUT_PORTS( c64_ide64 ) +//------------------------------------------------- + +static INPUT_PORTS_START( c64_ide64 ) + PORT_START("JP1") + PORT_DIPNAME( 0x01, 0x01, "Flash ROM Write Protect" ) + PORT_DIPSETTING( 0x00, "Disabled" ) + PORT_DIPSETTING( 0x01, "Enabled" ) +INPUT_PORTS_END + + +//------------------------------------------------- +// input_ports - device-specific input ports +//------------------------------------------------- + +ioport_constructor c64_ide64_cartridge_device::device_input_ports() const +{ + return INPUT_PORTS_NAME( c64_ide64 ); +} + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// c64_ide64_cartridge_device - constructor +//------------------------------------------------- + +c64_ide64_cartridge_device::c64_ide64_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, C64_IDE64, "C64 IDE64 cartridge", tag, owner, clock), + device_c64_expansion_card_interface(mconfig, *this), + m_flash_rom(*this, AT29C010A_TAG), + m_rtc(*this, DS1302_TAG), + m_ide(*this, IDE_TAG) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c64_ide64_cartridge_device::device_start() +{ + // allocate memory + c64_ram_pointer(machine(), 0x8000); + + // state saving + save_item(NAME(m_bank)); + save_item(NAME(m_ide_data)); + save_item(NAME(m_enable)); +} + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void c64_ide64_cartridge_device::device_reset() +{ + m_bank = 0; + + m_enable = 1; + + m_wp = ioport("JP1")->read(); + m_game = !m_wp; + m_exrom = !m_wp; +} + + +//------------------------------------------------- +// c64_cd_r - cartridge data read +//------------------------------------------------- + +UINT8 c64_ide64_cartridge_device::c64_cd_r(address_space &space, offs_t offset, int ba, int roml, int romh, int io1, int io2) +{ + if (!m_enable) return 0; + + UINT8 data = 0; + int rom_oe = 1, ram_oe = 1; + + if (!m_game && m_exrom && ba) + { + if (offset >= 0x1000 && offset < 0x8000) + { + ram_oe = 0; + } + else if (offset >= 0x8000 && offset < 0xc000) + { + rom_oe = 0; + } + else if (offset >= 0xc000 && offset < 0xd000) + { + ram_oe = 0; + } + } + + if (!roml || !romh) + { + rom_oe = 0; + } + + if (!io1) + { + // 0x20-0x2f IDE + // 0x30-0x37 I/O + // 0x5d-0x5e FT245 + // 0x5f-0x5f DS1302 + // 0x60-0xff ROM + + UINT8 io1_offset = offset & 0xff; + + if (io1_offset >= 0x20 && io1_offset < 0x30) + { + m_ide_data = ide_bus_r(m_ide, BIT(offset, 3), offset & 0x07); + + data = m_ide_data & 0xff; + } + else if (io1_offset == 0x31) + { + data = m_ide_data >> 8; + } + else if (io1_offset == 0x32) + { + /* + + bit description + + 0 EXROM + 1 GAME + 2 A14 + 3 A15 + 4 A16 + 5 v4.x + 6 + 7 + + */ + + data = 0x20 | (m_bank << 2) | (m_game << 1) | m_exrom; + } + else if (io1_offset == 0x5f) + { + m_rtc->sclk_w(0); + + data = m_rtc->io_r(); + + m_rtc->sclk_w(1); + } + else if (io1_offset >= 0x60) + { + rom_oe = 0; + } + } + + if (!rom_oe) + { + offs_t addr = (m_bank << 14) | (offset & 0x3fff); + data = m_flash_rom->read(addr); + } + else if (!ram_oe) + { + data = m_ram[offset & 0x7fff]; + } + + return data; +} + + +//------------------------------------------------- +// c64_cd_w - cartridge data write +//------------------------------------------------- + +void c64_ide64_cartridge_device::c64_cd_w(address_space &space, offs_t offset, UINT8 data, int ba, int roml, int romh, int io1, int io2) +{ + if (!m_enable) return; + + if (!m_game && m_exrom && ba) + { + if (offset >= 0x1000 && offset < 0x8000) + { + m_ram[offset & 0x7fff] = data; + } + else if (offset >= 0xc000 && offset < 0xd000) + { + m_ram[offset & 0x7fff] = data; + } + } + + if ((offset >= 0x8000 && offset < 0xc000) && !m_wp) + { + offs_t addr = (m_bank << 14) | (offset & 0x3fff); + m_flash_rom->write(addr, data); + } + + if (!io1) + { + // 0x20-0x2f IDE + // 0x30-0x37 I/O + // 0x5d-0x5e FT245 + // 0x5f-0x5f DS1302 + // 0x60-0xff ROM + + UINT8 io1_offset = offset & 0xff; + + if (io1_offset >= 0x20 && io1_offset < 0x30) + { + m_ide_data = (m_ide_data & 0xff00) | data; + + ide_bus_w(m_ide, BIT(offset, 3), offset & 0x07, m_ide_data); + } + else if (io1_offset == 0x31) + { + m_ide_data = (data << 8) | (m_ide_data & 0xff); + } + else if (io1_offset == 0x5f) + { + m_rtc->sclk_w(0); + + m_rtc->io_w(BIT(data, 0)); + + m_rtc->sclk_w(1); + } + else if (io1_offset >= 0x60 && io1_offset < 0x68) + { + m_bank = offset & 0x07; + } + else if (io1_offset == 0xfb) + { + /* + + bit description + + 0 disable cartridge + 1 RTC CE + 2 + 3 + 4 + 5 + 6 + 7 + + */ + + m_enable = !BIT(data, 0); + m_rtc->ce_w(BIT(data, 1)); + } + else if (io1_offset >= 0xfc) + { + m_game = BIT(offset, 0); + m_exrom = BIT(offset, 1); + } + } +} |