// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** Timeworks PARTNER 64 cartridge emulation Copyright MESS Team. Visit http://mamedev.org for licensing and usage restrictions. **********************************************************************/ /* PCB Layout ---------- |===========================| |=| | |=|LS05 LS09 LS00 HC74 | |=| | |=| | |=| ROM RAM | |=| LS133 | |=| LS156 | |=| | |===========================| ROM - General Instrument 27C128-25 16Kx8 EPROM "TIMEWORKS C-64 VER 2-16-87" RAM - Sony CXK5864PN-15L 8Kx8 SRAM */ #include "partner.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** const device_type C64_PARTNER = &device_creator; //------------------------------------------------- // INPUT_PORTS( c64_partner ) //------------------------------------------------- WRITE_LINE_MEMBER( c64_partner_cartridge_device::nmi_w ) { if (!state && !m_a6 && !m_nmi) { m_slot->nmi_w(ASSERT_LINE); m_nmi = 1; } } static INPUT_PORTS_START( c64_partner ) PORT_START("NMI") PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_NAME("Menu") PORT_CODE(KEYCODE_F11) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, c64_partner_cartridge_device, nmi_w) INPUT_PORTS_END //------------------------------------------------- // input_ports - device-specific input ports //------------------------------------------------- ioport_constructor c64_partner_cartridge_device::device_input_ports() const { return INPUT_PORTS_NAME( c64_partner ); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // c64_partner_cartridge_device - constructor //------------------------------------------------- c64_partner_cartridge_device::c64_partner_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, C64_PARTNER, "C64 PARTNER 64 cartridge", tag, owner, clock, "c64_partner", __FILE__), device_c64_expansion_card_interface(mconfig, *this), m_a0(1), m_a6(1), m_nmi(0) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void c64_partner_cartridge_device::device_start() { // allocate memory c64_ram_pointer(machine(), 0x2000); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void c64_partner_cartridge_device::device_reset() { m_a0 = 1; m_a6 = 1; if (m_nmi && m_a6) { m_slot->nmi_w(CLEAR_LINE); m_nmi = 0; } } //------------------------------------------------- // c64_cd_r - cartridge data read //------------------------------------------------- UINT8 c64_partner_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 (!io1) { data = m_romh[offset & 0x3fff]; } if (m_nmi && (offset == 0xfffa || offset == 0xfffb)) { m_a0 = 1; } if (m_a0 && BIT(offset, 15)) { switch ((offset >> 13) & 0x03) { case 0: case 3: data = m_romh[offset & 0x3fff]; break; case 1: data = m_ram[offset & 0x1fff]; break; } } return data; } //------------------------------------------------- // c64_cd_w - cartridge data write //------------------------------------------------- void c64_partner_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 (!io1) { m_a0 = BIT(offset, 0); m_a6 = BIT(offset, 6); if (m_nmi && m_a6) { m_slot->nmi_w(CLEAR_LINE); m_nmi = 0; } } if (m_a0 && BIT(offset, 15)) { switch ((offset >> 13) & 0x03) { case 1: m_ram[offset & 0x1fff] = data; break; } } if (m_nmi && (offset == 0xfffa || offset == 0xfffb)) { m_a0 = 1; } } //------------------------------------------------- // c64_game_r - GAME read //------------------------------------------------- int c64_partner_cartridge_device::c64_game_r(offs_t offset, int sphi2, int ba, int rw) { int game = 1; if (m_a0 && BIT(offset, 15)) { switch ((offset >> 13) & 0x03) { case 0: case 1: case 3: game = 0; break; } } // TODO if I/O1=0, GAME=0 return game; }