// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** EasyFlash cartridge emulation **********************************************************************/ #include "emu.h" #include "easyflash.h" //************************************************************************** // MACROS/CONSTANTS //************************************************************************** #define AM29F040_0_TAG "u3" #define AM29F040_1_TAG "u4" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(C64_EASYFLASH, c64_easyflash_cartridge_device, "c64_easyflash", "C64 EasyFlash cartridge") //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- void c64_easyflash_cartridge_device::device_add_mconfig(machine_config &config) { AMD_29F040(config, AM29F040_0_TAG); AMD_29F040(config, AM29F040_1_TAG); } //------------------------------------------------- // INPUT_PORTS( c64_easyflash ) //------------------------------------------------- static INPUT_PORTS_START( c64_easyflash ) PORT_START("JP1") PORT_DIPNAME( 0x01, 0x00, "Boot" ) PORT_DIPSETTING( 0x00, "Disable" ) PORT_DIPSETTING( 0x01, "Boot" ) PORT_START("RESET") PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_NAME("Reset") PORT_CODE(KEYCODE_F11) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF_OWNER, c64_expansion_slot_device, reset_w) INPUT_PORTS_END //------------------------------------------------- // input_ports - device-specific input ports //------------------------------------------------- ioport_constructor c64_easyflash_cartridge_device::device_input_ports() const { return INPUT_PORTS_NAME( c64_easyflash ); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // c64_easyflash_cartridge_device - constructor //------------------------------------------------- c64_easyflash_cartridge_device::c64_easyflash_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, C64_EASYFLASH, tag, owner, clock), device_c64_expansion_card_interface(mconfig, *this), m_flash_roml(*this, AM29F040_0_TAG), m_flash_romh(*this, AM29F040_1_TAG), m_jp1(*this, "JP1"), m_ram(*this, "ram", 0x100, ENDIANNESS_LITTLE), m_bank(0), m_mode(0) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void c64_easyflash_cartridge_device::device_start() { // state saving save_item(NAME(m_bank)); save_item(NAME(m_mode)); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void c64_easyflash_cartridge_device::device_reset() { m_bank = 0; m_mode = 0; } //------------------------------------------------- // c64_cd_r - cartridge data read //------------------------------------------------- uint8_t c64_easyflash_cartridge_device::c64_cd_r(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2) { if (!roml) { offs_t addr = (m_bank << 13) | (offset & 0x1fff); data = m_flash_roml->read(addr); } else if (!romh) { offs_t addr = (m_bank << 13) | (offset & 0x1fff); data = m_flash_romh->read(addr); } else if (!io2) { data = m_ram[offset & 0xff]; } return data; } //------------------------------------------------- // c64_cd_w - cartridge data write //------------------------------------------------- void c64_easyflash_cartridge_device::c64_cd_w(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2) { if (!roml) { offs_t addr = (m_bank << 13) | (offset & 0x1fff); m_flash_roml->write(addr, data); } else if (!romh) { offs_t addr = (m_bank << 13) | (offset & 0x1fff); m_flash_romh->write(addr, data); } else if (!io1) { if (!BIT(offset, 1)) { /* bit description 0 BA13 1 BA14 2 BA15 3 BA16 4 BA17 5 BA18 6 7 */ m_bank = data & 0x3f; } else { /* bit description 0 GAME 1 EXROM 2 MODE 3 4 5 6 7 LED */ m_mode = data; } } else if (!io2) { m_ram[offset & 0xff] = data; } } //------------------------------------------------- // c64_exrom_r - EXROM read //------------------------------------------------- int c64_easyflash_cartridge_device::c64_exrom_r(offs_t offset, int sphi2, int ba, int rw) { return !BIT(m_mode, 1); } //------------------------------------------------- // c64_game_r - GAME read //------------------------------------------------- int c64_easyflash_cartridge_device::c64_game_r(offs_t offset, int sphi2, int ba, int rw) { return (BIT(m_mode, 0) || !(BIT(m_mode, 2) || m_jp1->read())) ? 0 : 1; }