// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** Dela 64KB EPROM cartridge emulation **********************************************************************/ #include "emu.h" #include "dela_ep64.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(C64_DELA_EP64, c64_dela_ep64_cartridge_device, "c64_dela_ep64", "C64 Rex 64KB EPROM cartridge") //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- void c64_dela_ep64_cartridge_device::device_add_mconfig(machine_config &config) { GENERIC_SOCKET(config, m_eprom1, generic_linear_slot, nullptr, "rom,bin"); GENERIC_SOCKET(config, m_eprom2, generic_linear_slot, nullptr, "rom,bin"); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // c64_dela_ep64_cartridge_device - constructor //------------------------------------------------- c64_dela_ep64_cartridge_device::c64_dela_ep64_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, C64_DELA_EP64, tag, owner, clock), device_c64_expansion_card_interface(mconfig, *this), m_eprom1(*this, "eprom1"), m_eprom2(*this, "eprom2"), m_bank(0), m_reset(0), m_rom0_ce(0), m_rom1_ce(0), m_rom2_ce(0) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void c64_dela_ep64_cartridge_device::device_start() { // state saving save_item(NAME(m_bank)); save_item(NAME(m_reset)); save_item(NAME(m_rom0_ce)); save_item(NAME(m_rom1_ce)); save_item(NAME(m_rom2_ce)); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void c64_dela_ep64_cartridge_device::device_reset() { m_exrom = 0; m_reset = 1; } //------------------------------------------------- // c64_cd_r - cartridge data read //------------------------------------------------- uint8_t c64_dela_ep64_cartridge_device::c64_cd_r(offs_t offset, uint8_t 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); if (!m_rom0_ce) data |= m_roml[offset & 0x1fff]; if (!m_rom1_ce) data |= m_eprom1->read_rom(addr); if (!m_rom2_ce) data |= m_eprom2->read_rom(addr); } } return data; } //------------------------------------------------- // c64_cd_w - cartridge data write //------------------------------------------------- void c64_dela_ep64_cartridge_device::c64_cd_w(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2) { if (!io1) { /* bit description 0 IC6 _CE 1 IC5 _CE 2 3 IC4 _CE 4 A13 5 A14 6 7 EXROM */ m_reset = 0; m_rom0_ce = BIT(data, 3); m_rom1_ce = BIT(data, 1); m_rom2_ce = BIT(data, 0); m_bank = (data >> 4) & 0x03; m_exrom = BIT(data, 7); } }