diff options
Diffstat (limited to 'src/devices/bus/c64/partner.c')
-rw-r--r-- | src/devices/bus/c64/partner.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/src/devices/bus/c64/partner.c b/src/devices/bus/c64/partner.c new file mode 100644 index 00000000000..4feb8022b08 --- /dev/null +++ b/src/devices/bus/c64/partner.c @@ -0,0 +1,208 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + Timeworks PARTNER 64 cartridge emulation + +**********************************************************************/ + +/* + + 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<c64_partner_cartridge_device>; + + +//------------------------------------------------- +// 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_ram(*this, "ram"), + m_a0(1), + m_a6(1), + m_nmi(0) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c64_partner_cartridge_device::device_start() +{ + // allocate memory + m_ram.allocate(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; +} |