diff options
Diffstat (limited to 'src/devices/bus/c64/easyflash.cpp')
-rw-r--r-- | src/devices/bus/c64/easyflash.cpp | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/src/devices/bus/c64/easyflash.cpp b/src/devices/bus/c64/easyflash.cpp new file mode 100644 index 00000000000..0af06b0cc48 --- /dev/null +++ b/src/devices/bus/c64/easyflash.cpp @@ -0,0 +1,228 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + EasyFlash cartridge emulation + +**********************************************************************/ + +#include "easyflash.h" + + +//************************************************************************** +// MACROS/CONSTANTS +//************************************************************************** + +#define AM29F040_0_TAG "u3" +#define AM29F040_1_TAG "u4" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type C64_EASYFLASH = &device_creator<c64_easyflash_cartridge_device>; + + +//------------------------------------------------- +// MACHINE_CONFIG_FRAGMENT( c64_easyflash ) +//------------------------------------------------- + +static MACHINE_CONFIG_FRAGMENT( c64_easyflash ) + MCFG_AMD_29F040_ADD(AM29F040_0_TAG) + MCFG_AMD_29F040_ADD(AM29F040_1_TAG) +MACHINE_CONFIG_END + + +//------------------------------------------------- +// machine_config_additions - device-specific +// machine configurations +//------------------------------------------------- + +machine_config_constructor c64_easyflash_cartridge_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( c64_easyflash ); +} + + +//------------------------------------------------- +// 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 clock) : + device_t(mconfig, C64_EASYFLASH, "C64 EasyFlash cartridge", tag, owner, clock, "c64_easyflash", __FILE__), + 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"), + m_bank(0), + m_mode(0) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c64_easyflash_cartridge_device::device_start() +{ + // allocate memory + m_ram.allocate(0x100); + + // 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 c64_easyflash_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) +{ + 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(address_space &space, offs_t offset, UINT8 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())); +} |