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Diffstat (limited to 'src/devices/bus/c64/final3.c')
-rw-r--r-- | src/devices/bus/c64/final3.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/src/devices/bus/c64/final3.c b/src/devices/bus/c64/final3.c new file mode 100644 index 00000000000..20f969bcbe7 --- /dev/null +++ b/src/devices/bus/c64/final3.c @@ -0,0 +1,150 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + Final Cartridge III emulation + +**********************************************************************/ + +#include "final3.h" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type C64_FINAL3 = &device_creator<c64_final3_cartridge_device>; + + +//------------------------------------------------- +// INPUT_CHANGED_MEMBER( freeze ) +//------------------------------------------------- + +INPUT_CHANGED_MEMBER( c64_final3_cartridge_device::freeze ) +{ + if (newval) + { + m_game = 0; + m_hidden = 0; + } + + m_slot->nmi_w(newval); +} + + +//------------------------------------------------- +// INPUT_PORTS( c64_final3 ) +//------------------------------------------------- + +static INPUT_PORTS_START( c64_final3 ) + PORT_START("SW") + PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_OTHER ) PORT_NAME("Reset") PORT_CODE(KEYCODE_F11) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF_OWNER, c64_expansion_slot_device, reset_w) + PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_NAME("Freeze") PORT_CODE(KEYCODE_F12) PORT_CHANGED_MEMBER(DEVICE_SELF, c64_final3_cartridge_device, freeze, 0) +INPUT_PORTS_END + + +//------------------------------------------------- +// input_ports - device-specific input ports +//------------------------------------------------- + +ioport_constructor c64_final3_cartridge_device::device_input_ports() const +{ + return INPUT_PORTS_NAME( c64_final3 ); +} + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// c64_final3_cartridge_device - constructor +//------------------------------------------------- + +c64_final3_cartridge_device::c64_final3_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, C64_FINAL3, "C64 Final Cartridge III", tag, owner, clock, "c64_final3", __FILE__), + device_c64_expansion_card_interface(mconfig, *this) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c64_final3_cartridge_device::device_start() +{ + // state saving + save_item(NAME(m_bank)); + save_item(NAME(m_hidden)); +} + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void c64_final3_cartridge_device::device_reset() +{ + m_bank = 0; + + m_exrom = 0; + m_game = 0; + + m_slot->nmi_w(CLEAR_LINE); + + m_hidden = 0; +} + + +//------------------------------------------------- +// c64_cd_r - cartridge data read +//------------------------------------------------- + +UINT8 c64_final3_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 (!roml || !romh || !io1 || !io2) + { + offs_t addr = (m_bank << 14) | (offset & 0x3fff); + data = m_roml[addr]; + } + + return data; +} + + +//------------------------------------------------- +// c64_cd_w - cartridge data write +//------------------------------------------------- + +void c64_final3_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 (!m_hidden && !io2 && ((offset & 0xff) == 0xff)) + { + /* + + bit description + + 0 A14 + 1 A15 + 2 + 3 + 4 EXROM + 5 GAME + 6 NMI + 7 hide register + + */ + + m_bank = data & 0x03; + + m_exrom = BIT(data, 4); + m_game = BIT(data, 5); + + m_slot->nmi_w(BIT(data, 6) ? CLEAR_LINE : ASSERT_LINE); + + m_hidden = BIT(data, 7); + } +} |