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Diffstat (limited to 'src/devices/bus/c64/reu.c')
-rw-r--r-- | src/devices/bus/c64/reu.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/src/devices/bus/c64/reu.c b/src/devices/bus/c64/reu.c new file mode 100644 index 00000000000..bc83c9554d2 --- /dev/null +++ b/src/devices/bus/c64/reu.c @@ -0,0 +1,137 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + Commodore 1700/1750/1764 RAM Expansion Unit emulation + +**********************************************************************/ + +#include "reu.h" + + + +//************************************************************************** +// MACROS / CONSTANTS +//************************************************************************** + +#define MOS8726R1_TAG "u1" + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type C64_REU1700 = &device_creator<c64_reu1700_cartridge_device>; +const device_type C64_REU1750 = &device_creator<c64_reu1750_cartridge_device>; +const device_type C64_REU1764 = &device_creator<c64_reu1764_cartridge_device>; + + +//------------------------------------------------- +// MACHINE_CONFIG_FRAGMENT( c64_reu ) +//------------------------------------------------- + +static MACHINE_CONFIG_FRAGMENT( c64_reu ) + MCFG_MOS8726_ADD(MOS8726R1_TAG) + + MCFG_GENERIC_SOCKET_ADD("rom", generic_linear_slot, NULL) + MCFG_GENERIC_EXTENSIONS("bin,rom") +MACHINE_CONFIG_END + + +//------------------------------------------------- +// machine_config_additions - device-specific +// machine configurations +//------------------------------------------------- + +machine_config_constructor c64_reu_cartridge_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( c64_reu ); +} + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// c64_reu_cartridge_device - constructor +//------------------------------------------------- + +c64_reu_cartridge_device::c64_reu_cartridge_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, UINT32 variant, int jp1, size_t ram_size, const char *shortname, const char *source) : + device_t(mconfig, type, name, tag, owner, clock, shortname, source), + device_c64_expansion_card_interface(mconfig, *this), + m_dmac(*this, MOS8726R1_TAG), + m_eprom(*this, "rom"), + m_ram(*this, "ram"), + m_variant(variant), + m_jp1(jp1), + m_ram_size(ram_size) +{ +} + +c64_reu1700_cartridge_device::c64_reu1700_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : c64_reu_cartridge_device(mconfig, C64_REU1700, "1700 REU", tag, owner, clock, TYPE_1700, 0, 128 * 1024, "c64_1700reu", __FILE__) { } + +c64_reu1750_cartridge_device::c64_reu1750_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : c64_reu_cartridge_device(mconfig, C64_REU1750, "1750 REU", tag, owner, clock, TYPE_1750, 1, 256 * 1024, "c64_1750reu", __FILE__) { } + +c64_reu1764_cartridge_device::c64_reu1764_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : c64_reu_cartridge_device(mconfig, C64_REU1764, "1764 REU", tag, owner, clock, TYPE_1764, 1, 512 * 1024, "c64_1764reu", __FILE__) { } + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c64_reu_cartridge_device::device_start() +{ + // allocate memory + m_ram.allocate(m_ram_size); + + // setup DMA controller + m_dmac->set_unscaled_clock(m_slot->phi2()); + m_dmac->bs_w(m_jp1); +} + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void c64_reu_cartridge_device::device_reset() +{ + m_dmac->reset(); +} + + +//------------------------------------------------- +// c64_cd_r - cartridge data read +//------------------------------------------------- + +UINT8 c64_reu_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 (!m_dmac->romsel_r(roml, romh)) + { + data = m_eprom->read_rom(space, offset & 0x7fff); + } + else if (!io2) + { + data = m_dmac->read(space, offset); + } + + return data; +} + + +//------------------------------------------------- +// c64_cd_w - cartridge data write +//------------------------------------------------- + +void c64_reu_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) + { + m_dmac->write(space, offset, data); + } +} |