diff options
Diffstat (limited to 'src/mess/machine/c64/rex_ep256.c')
-rw-r--r-- | src/mess/machine/c64/rex_ep256.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/src/mess/machine/c64/rex_ep256.c b/src/mess/machine/c64/rex_ep256.c new file mode 100644 index 00000000000..e6fe4325d6f --- /dev/null +++ b/src/mess/machine/c64/rex_ep256.c @@ -0,0 +1,185 @@ +/********************************************************************** + + Rex Datentechnik 256KB EPROM cartridge emulation + + Copyright MESS Team. + Visit http://mamedev.org for licensing and usage restrictions. + +**********************************************************************/ + +#include "rex_ep256.h" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type C64_REX_EP256 = &device_creator<c64_rex_ep256_cartridge_device>; + + +//------------------------------------------------- +// ROM( c64_rex_ep256 ) +//------------------------------------------------- + +ROM_START( c64_rex_ep256 ) + ROM_REGION( 0x40000, "eprom", 0 ) + ROM_CART_LOAD( "rom1", 0x00000, 0x08000, ROM_MIRROR ) + ROM_CART_LOAD( "rom2", 0x08000, 0x08000, ROM_MIRROR ) + ROM_CART_LOAD( "rom3", 0x10000, 0x08000, ROM_MIRROR ) + ROM_CART_LOAD( "rom4", 0x18000, 0x08000, ROM_MIRROR ) + ROM_CART_LOAD( "rom5", 0x20000, 0x08000, ROM_MIRROR ) + ROM_CART_LOAD( "rom6", 0x28000, 0x08000, ROM_MIRROR ) + ROM_CART_LOAD( "rom7", 0x30000, 0x08000, ROM_MIRROR ) + ROM_CART_LOAD( "rom8", 0x38000, 0x08000, ROM_MIRROR ) +ROM_END + + +//------------------------------------------------- +// rom_region - device-specific ROM region +//------------------------------------------------- + +const rom_entry *c64_rex_ep256_cartridge_device::device_rom_region() const +{ + return ROM_NAME( c64_rex_ep256 ); +} + + +//------------------------------------------------- +// MACHINE_CONFIG_FRAGMENT( c64_rex_ep256 ) +//------------------------------------------------- + +static MACHINE_CONFIG_FRAGMENT( c64_rex_ep256 ) + MCFG_CARTSLOT_ADD("rom1") + MCFG_CARTSLOT_EXTENSION_LIST("rom,bin") + MCFG_CARTSLOT_ADD("rom2") + MCFG_CARTSLOT_EXTENSION_LIST("rom,bin") + MCFG_CARTSLOT_ADD("rom3") + MCFG_CARTSLOT_EXTENSION_LIST("rom,bin") + MCFG_CARTSLOT_ADD("rom4") + MCFG_CARTSLOT_EXTENSION_LIST("rom,bin") + MCFG_CARTSLOT_ADD("rom5") + MCFG_CARTSLOT_EXTENSION_LIST("rom,bin") + MCFG_CARTSLOT_ADD("rom6") + MCFG_CARTSLOT_EXTENSION_LIST("rom,bin") + MCFG_CARTSLOT_ADD("rom7") + MCFG_CARTSLOT_EXTENSION_LIST("rom,bin") + MCFG_CARTSLOT_ADD("rom8") + MCFG_CARTSLOT_EXTENSION_LIST("rom,bin") +MACHINE_CONFIG_END + + +//------------------------------------------------- +// machine_config_additions - device-specific +// machine configurations +//------------------------------------------------- + +machine_config_constructor c64_rex_ep256_cartridge_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( c64_rex_ep256 ); +} + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// c64_rex_ep256_cartridge_device - constructor +//------------------------------------------------- + +c64_rex_ep256_cartridge_device::c64_rex_ep256_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, C64_REX_EP256, "C64 Rex 256KB EPROM cartridge", tag, owner, clock, "rexep256", __FILE__), + device_c64_expansion_card_interface(mconfig, *this), + m_eprom(*this, "eprom") +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c64_rex_ep256_cartridge_device::device_start() +{ + // state saving + save_item(NAME(m_bank)); + save_item(NAME(m_reset)); +} + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void c64_rex_ep256_cartridge_device::device_reset() +{ + m_exrom = 0; + m_reset = 1; + m_bank = 0; +} + + +//------------------------------------------------- +// c64_cd_r - cartridge data read +//------------------------------------------------- + +UINT8 c64_rex_ep256_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) + { + if (m_reset) + { + data = m_roml[offset & 0x1fff]; + } + else + { + offs_t addr = (m_bank << 13) | (offset & 0x1fff); + data = m_eprom->base()[addr]; + } + } + else if (!io2) + { + if ((offset & 0xf0) == 0xc0) + { + m_exrom = 1; + } + else if ((offset & 0xf0) == 0xe0) + { + m_exrom = 0; + } + } + + return data; +} + + +//------------------------------------------------- +// c64_cd_w - cartridge data write +//------------------------------------------------- + +void c64_rex_ep256_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 (!io2 && ((offset & 0xf0) == 0xa0)) + { + /* + + bit description + + 0 socket selection bit 0 + 1 socket selection bit 1 + 2 socket selection bit 2 + 3 + 4 + 5 bank selection bit 0 + 6 bank selection bit 1 + 7 + + */ + + m_reset = 0; + + m_bank = ((data & 0x07) << 2) | ((data >> 5) & 0x03); + } +} |