diff options
author | 2013-10-20 17:49:46 +0000 | |
---|---|---|
committer | 2013-10-20 17:49:46 +0000 | |
commit | 1359d642c9656987b6d988e8aafb628841fcc97f (patch) | |
tree | 80aba2eeaa4d3b1687ad54d5e83d225e5b32ed7f /src/emu/bus/c64/magic_formel.c | |
parent | 9cd179295e4783237b05a0c1369b46254da7c04a (diff) |
(MESS) c64: Moved expansion and user ports under emu/bus. (nw)
Diffstat (limited to 'src/emu/bus/c64/magic_formel.c')
-rw-r--r-- | src/emu/bus/c64/magic_formel.c | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/src/emu/bus/c64/magic_formel.c b/src/emu/bus/c64/magic_formel.c new file mode 100644 index 00000000000..8258e6dd3ed --- /dev/null +++ b/src/emu/bus/c64/magic_formel.c @@ -0,0 +1,282 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + Magic Formel cartridge emulation + + Copyright MESS Team. + Visit http://mamedev.org for licensing and usage restrictions. + +**********************************************************************/ + +#include "magic_formel.h" + + + +//************************************************************************** +// MACROS/CONSTANTS +//************************************************************************** + +#define MC6821_TAG "mc6821" + +#define PA4 (m_pb7_ff ? m_ram_oe : 0) + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type C64_MAGIC_FORMEL = &device_creator<c64_magic_formel_cartridge_device>; + + +//------------------------------------------------- +// pia6821_interface pia_intf +//------------------------------------------------- + +WRITE8_MEMBER( c64_magic_formel_cartridge_device::pia_pa_w ) +{ + /* + + bit description + + PA0 ROM A13 + PA1 ROM A14 + PA2 ROM A15 + PA3 ROM _OE + PA4 RAM _OE + PA5 + PA6 + PA7 + + */ + + logerror("PA %02x\n",data); + m_rom_bank = data & 0x0f; + + m_rom_oe = BIT(data, 3); + + m_ram_oe = BIT(data, 4); +} + +WRITE8_MEMBER( c64_magic_formel_cartridge_device::pia_pb_w ) +{ + /* + + bit description + + PB0 RAM A10 + PB1 RAM A11 + PB2 RAM A9 + PB3 RAM A8 + PB4 RAM A12 + PB5 + PB6 + PB7 ROMH enable + + */ + logerror("PB %02x\n",data); + m_ram_bank = data & 0x1f; + + m_pb7 = BIT(data, 7); + + if (!m_pb7) + { + m_pb7_ff = 1; + } +} + +WRITE_LINE_MEMBER( c64_magic_formel_cartridge_device::pia_cb2_w ) +{ + if (!state) + { + m_cb2_ff = 1; + } +} + +static const pia6821_interface pia_intf = +{ + DEVCB_NULL, // input A + DEVCB_NULL, // input B + DEVCB_NULL, // input CA1 + DEVCB_NULL, // input CB1 + DEVCB_NULL, // input CA2 + DEVCB_NULL, // input CB2 + DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, c64_magic_formel_cartridge_device, pia_pa_w), // output A + DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, c64_magic_formel_cartridge_device, pia_pb_w), // output B + DEVCB_NULL, // output CA2 + DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, c64_magic_formel_cartridge_device, pia_cb2_w), // output CB2 + DEVCB_NULL, // irq A + DEVCB_NULL // irq B +}; + + +//------------------------------------------------- +// MACHINE_CONFIG_FRAGMENT( c64_magic_formel ) +//------------------------------------------------- + +static MACHINE_CONFIG_FRAGMENT( c64_magic_formel ) + MCFG_PIA6821_ADD(MC6821_TAG, pia_intf) +MACHINE_CONFIG_END + + +//------------------------------------------------- +// machine_config_additions - device-specific +// machine configurations +//------------------------------------------------- + +machine_config_constructor c64_magic_formel_cartridge_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( c64_magic_formel ); +} + + +//------------------------------------------------- +// INPUT_CHANGED_MEMBER( freeze ) +//------------------------------------------------- + +INPUT_CHANGED_MEMBER( c64_magic_formel_cartridge_device::freeze ) +{ + if (newval && (m_pb7_ff & m_cb2_ff)) + { + m_cb2_ff = 0; + + m_slot->nmi_w(ASSERT_LINE); + } + else + { + m_slot->nmi_w(CLEAR_LINE); + } +} + + +//------------------------------------------------- +// INPUT_PORTS( c64_magic_formel ) +//------------------------------------------------- + +static INPUT_PORTS_START( c64_magic_formel ) + PORT_START("FREEZE") + PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_NAME("Freeze") PORT_CODE(KEYCODE_F12) PORT_CHANGED_MEMBER(DEVICE_SELF, c64_magic_formel_cartridge_device, freeze, 0) +INPUT_PORTS_END + + +//------------------------------------------------- +// input_ports - device-specific input ports +//------------------------------------------------- + +ioport_constructor c64_magic_formel_cartridge_device::device_input_ports() const +{ + return INPUT_PORTS_NAME( c64_magic_formel ); +} + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// c64_magic_formel_cartridge_device - constructor +//------------------------------------------------- + +c64_magic_formel_cartridge_device::c64_magic_formel_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, C64_MAGIC_FORMEL, "C64 Magic Formel cartridge", tag, owner, clock, "c64_magic_formel", __FILE__), + device_c64_expansion_card_interface(mconfig, *this), + m_pia(*this, MC6821_TAG), + m_rom_bank(0), + m_ram_bank(0), + m_pb7_ff(0), + m_cb2_ff(0), + m_rom_oe(0), + m_ram_oe(0), + m_pb7(1) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c64_magic_formel_cartridge_device::device_start() +{ + // state saving + save_item(NAME(m_rom_bank)); + save_item(NAME(m_ram_bank)); + save_item(NAME(m_pb7_ff)); + save_item(NAME(m_cb2_ff)); + save_item(NAME(m_rom_oe)); + save_item(NAME(m_ram_oe)); + save_item(NAME(m_pb7)); +} + + +//------------------------------------------------- +// device_reset - device-specific reset +//------------------------------------------------- + +void c64_magic_formel_cartridge_device::device_reset() +{ + m_rom_bank = 0; + m_ram_bank = 0; + m_pb7_ff = 0; + m_cb2_ff = 0; + m_rom_oe = 0; + m_ram_oe = 0; + m_pb7 = 1; +} + + +//------------------------------------------------- +// c64_cd_r - cartridge data read +//------------------------------------------------- + +UINT8 c64_magic_formel_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 (!romh && !m_rom_oe) + { + UINT8 bank = m_pb7_ff ? m_rom_bank : 0; + offs_t addr = (bank << 13) | (offset & 0x1fff); + data = m_romh[addr]; + } + else if (!io1 && !PA4) + { + offs_t addr = (m_ram_bank << 8) | (offset & 0xff); + data = m_ram[addr]; + } + + return data; +} + + +//------------------------------------------------- +// c64_cd_w - cartridge data write +//------------------------------------------------- + +void c64_magic_formel_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) + { + offs_t addr = (m_ram_bank << 8) | (offset & 0xff); + m_ram[addr] = data; + } + else if (!io2 && !(m_cb2_ff & PA4)) + { + offs_t addr = (offset >> 6) & 0x03; + UINT8 new_data = (BIT(data, 1) << 7) | (offset & 0x3f); + m_pia->write(space, addr, new_data); + } + else if (offset == 0x0001) + { + m_pb7_ff = 0; + } +} + + +//------------------------------------------------- +// c64_game_r - GAME read +//------------------------------------------------- + +int c64_magic_formel_cartridge_device::c64_game_r(offs_t offset, int sphi2, int ba, int rw) +{ + return !(ba & rw & ((offset & 0xe000) == 0xe000) & !(m_pb7 & m_cb2_ff)); +} |