// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** Commodore 1700/1750/1764 RAM Expansion Unit emulation **********************************************************************/ #include "emu.h" #include "reu.h" //************************************************************************** // MACROS / CONSTANTS //************************************************************************** #define MOS8726R1_TAG "u1" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(C64_REU1700, c64_reu1700_cartridge_device, "c64_1700reu", "1700 RAM Expansion Unit") DEFINE_DEVICE_TYPE(C64_REU1750, c64_reu1750_cartridge_device, "c64_1750reu", "1750 RAM Expansion Unit") DEFINE_DEVICE_TYPE(C64_REU1764, c64_reu1764_cartridge_device, "c64_1764reu", "1764 RAM Expansion Unit") //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- void c64_reu_cartridge_device::device_add_mconfig(machine_config &config) { MOS8726(config, m_dmac, 1000000); // dummy clock GENERIC_SOCKET(config, m_eprom, generic_linear_slot, nullptr, "bin,rom"); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // c64_reu_cartridge_device - constructor //------------------------------------------------- c64_reu_cartridge_device::c64_reu_cartridge_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock, uint32_t variant, int jp1, size_t ram_size) : device_t(mconfig, type, tag, owner, clock), device_c64_expansion_card_interface(mconfig, *this), m_dmac(*this, MOS8726R1_TAG), m_eprom(*this, "rom"), m_ram(*this, "ram", ram_size, ENDIANNESS_LITTLE), 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_t clock) : c64_reu_cartridge_device(mconfig, C64_REU1700, tag, owner, clock, TYPE_1700, 0, 128 * 1024) { } c64_reu1750_cartridge_device::c64_reu1750_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : c64_reu_cartridge_device(mconfig, C64_REU1750, tag, owner, clock, TYPE_1750, 1, 256 * 1024) { } c64_reu1764_cartridge_device::c64_reu1764_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : c64_reu_cartridge_device(mconfig, C64_REU1764, tag, owner, clock, TYPE_1764, 1, 512 * 1024) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void c64_reu_cartridge_device::device_start() { // 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_t c64_reu_cartridge_device::c64_cd_r(offs_t offset, uint8_t 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(offset & 0x7fff); } else if (!io2) { data = m_dmac->read(offset); } return data; } //------------------------------------------------- // c64_cd_w - cartridge data write //------------------------------------------------- void c64_reu_cartridge_device::c64_cd_w(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2) { if (!io2) { m_dmac->write(offset, data); } }