diff options
Diffstat (limited to 'src/devices/bus/c64/dela_ep256.cpp')
-rw-r--r-- | src/devices/bus/c64/dela_ep256.cpp | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/src/devices/bus/c64/dela_ep256.cpp b/src/devices/bus/c64/dela_ep256.cpp new file mode 100644 index 00000000000..b4708e13856 --- /dev/null +++ b/src/devices/bus/c64/dela_ep256.cpp @@ -0,0 +1,156 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + Dela 256KB EPROM cartridge emulation + +**********************************************************************/ + +#include "dela_ep256.h" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type C64_DELA_EP256 = &device_creator<c64_dela_ep256_cartridge_device>; + + +//------------------------------------------------- +// MACHINE_CONFIG_FRAGMENT( c64_dela_ep256 ) +//------------------------------------------------- + +static MACHINE_CONFIG_FRAGMENT( c64_dela_ep256 ) + MCFG_GENERIC_SOCKET_ADD("rom1", generic_linear_slot, NULL) + MCFG_GENERIC_EXTENSIONS("bin,rom") + MCFG_GENERIC_SOCKET_ADD("rom2", generic_linear_slot, NULL) + MCFG_GENERIC_EXTENSIONS("bin,rom") + MCFG_GENERIC_SOCKET_ADD("rom3", generic_linear_slot, NULL) + MCFG_GENERIC_EXTENSIONS("bin,rom") + MCFG_GENERIC_SOCKET_ADD("rom4", generic_linear_slot, NULL) + MCFG_GENERIC_EXTENSIONS("bin,rom") + MCFG_GENERIC_SOCKET_ADD("rom5", generic_linear_slot, NULL) + MCFG_GENERIC_EXTENSIONS("bin,rom") + MCFG_GENERIC_SOCKET_ADD("rom6", generic_linear_slot, NULL) + MCFG_GENERIC_EXTENSIONS("bin,rom") + MCFG_GENERIC_SOCKET_ADD("rom7", generic_linear_slot, NULL) + MCFG_GENERIC_EXTENSIONS("bin,rom") + MCFG_GENERIC_SOCKET_ADD("rom8", generic_linear_slot, NULL) + MCFG_GENERIC_EXTENSIONS("bin,rom") +MACHINE_CONFIG_END + + +//------------------------------------------------- +// machine_config_additions - device-specific +// machine configurations +//------------------------------------------------- + +machine_config_constructor c64_dela_ep256_cartridge_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( c64_dela_ep256 ); +} + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// c64_dela_ep256_cartridge_device - constructor +//------------------------------------------------- + +c64_dela_ep256_cartridge_device::c64_dela_ep256_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, C64_DELA_EP256, "C64 Dela 256KB EPROM cartridge", tag, owner, clock, "delep256", __FILE__), + device_c64_expansion_card_interface(mconfig, *this) +{ + for (int i = 0; i < 8; i++) + { + char str[6]; + sprintf(str, "rom%i", i + 1); + m_eproms[i] = subdevice<generic_slot_device>(str); + } +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c64_dela_ep256_cartridge_device::device_start() +{ + // state saving + save_item(NAME(m_bank)); + save_item(NAME(m_reset)); + save_item(NAME(m_socket)); +} + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void c64_dela_ep256_cartridge_device::device_reset() +{ + m_reset = 1; + m_bank = 0; + m_exrom = 0; + m_socket = 0; +} + + +//------------------------------------------------- +// c64_cd_r - cartridge data read +//------------------------------------------------- + +UINT8 c64_dela_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_eproms[m_socket]->read_rom(space, addr); + } + } + + return data; +} + + +//------------------------------------------------- +// c64_cd_w - cartridge data write +//------------------------------------------------- + +void c64_dela_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 bank selection bit 0 + 5 bank selection bit 1 + 6 + 7 EXROM + + */ + + m_reset = 0; + + m_socket = data & 0x07; + m_bank = (data >> 4) & 0x03; + + m_exrom = BIT(data, 7); + } +} |