mirror of
https://github.com/holub/mame
synced 2025-06-28 07:04:35 +03:00
08b42aabaa
(MESS) vic20: Added floating bus read support to VIC and cartridge interface. (MESS) vic10: Added floating bus read support to VIC-II and cartridge interface. (MESS) c64: Added floating bus read support to cartridge interface. [Curt Coder] (MESS) plus4: Added floating bus read support to TED and cartridge interface. Implemented some Diag264 test cartridge loopback connectors. [Curt Coder] (MESS) c16: Added PAL/NTSC variants. (nw) (MESS) v364: Fixed speech ROM mapping. (nw) (MESS) compis: Separated keyboard to its own file. (nw) (MESS) huebler: Cleanup. (nw)
276 lines
6.8 KiB
C
276 lines
6.8 KiB
C
/**********************************************************************
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Magic Formel cartridge emulation
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Copyright MESS Team.
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Visit http://mamedev.org for licensing and usage restrictions.
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**********************************************************************/
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#include "c64_magic_formel.h"
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//**************************************************************************
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// MACROS/CONSTANTS
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//**************************************************************************
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#define MC6821_TAG "mc6821"
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#define PA4 (m_pb7_ff ? m_ram_oe : 0)
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//**************************************************************************
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// DEVICE DEFINITIONS
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//**************************************************************************
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const device_type C64_MAGIC_FORMEL = &device_creator<c64_magic_formel_cartridge_device>;
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//-------------------------------------------------
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// pia6821_interface pia_intf
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//-------------------------------------------------
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WRITE8_MEMBER( c64_magic_formel_cartridge_device::pia_pa_w )
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{
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/*
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bit description
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PA0 ROM A13
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PA1 ROM A14
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PA2 ROM A15
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PA3 ROM _OE
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PA4 RAM _OE
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PA5
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PA6
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PA7
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*/
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logerror("PA %02x\n",data);
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m_rom_bank = data & 0x0f;
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m_rom_oe = BIT(data, 3);
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m_ram_oe = BIT(data, 4);
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}
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WRITE8_MEMBER( c64_magic_formel_cartridge_device::pia_pb_w )
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{
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/*
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bit description
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PB0 RAM A10
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PB1 RAM A11
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PB2 RAM A9
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PB3 RAM A8
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PB4 RAM A12
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PB5
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PB6
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PB7 ROMH enable
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*/
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logerror("PB %02x\n",data);
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m_ram_bank = data & 0x1f;
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m_pb7 = BIT(data, 7);
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if (!m_pb7)
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{
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m_pb7_ff = 1;
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}
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}
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WRITE_LINE_MEMBER( c64_magic_formel_cartridge_device::pia_cb2_w )
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{
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if (!state)
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{
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m_cb2_ff = 1;
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}
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}
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static const pia6821_interface pia_intf =
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{
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DEVCB_NULL, // input A
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DEVCB_NULL, // input B
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DEVCB_NULL, // input CA1
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DEVCB_NULL, // input CB1
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DEVCB_NULL, // input CA2
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DEVCB_NULL, // input CB2
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DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, c64_magic_formel_cartridge_device, pia_pa_w), // output A
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DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, c64_magic_formel_cartridge_device, pia_pb_w), // output B
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DEVCB_NULL, // output CA2
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DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, c64_magic_formel_cartridge_device, pia_cb2_w), // output CB2
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DEVCB_NULL, // irq A
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DEVCB_NULL // irq B
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};
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//-------------------------------------------------
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// MACHINE_CONFIG_FRAGMENT( c64_magic_formel )
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//-------------------------------------------------
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static MACHINE_CONFIG_FRAGMENT( c64_magic_formel )
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MCFG_PIA6821_ADD(MC6821_TAG, pia_intf)
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MACHINE_CONFIG_END
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//-------------------------------------------------
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// machine_config_additions - device-specific
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// machine configurations
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//-------------------------------------------------
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machine_config_constructor c64_magic_formel_cartridge_device::device_mconfig_additions() const
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{
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return MACHINE_CONFIG_NAME( c64_magic_formel );
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}
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//-------------------------------------------------
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// INPUT_PORTS( c64_magic_formel )
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//-------------------------------------------------
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INPUT_CHANGED_MEMBER( c64_magic_formel_cartridge_device::freeze )
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{
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if (!newval && (m_pb7_ff & m_cb2_ff))
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{
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m_cb2_ff = 0;
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m_slot->nmi_w(ASSERT_LINE);
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}
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else
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{
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m_slot->nmi_w(CLEAR_LINE);
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}
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}
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static INPUT_PORTS_START( c64_magic_formel )
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PORT_START("FREEZE")
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PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_SPECIAL ) PORT_NAME("Freeze") PORT_CHANGED_MEMBER(DEVICE_SELF, c64_magic_formel_cartridge_device, freeze, 0)
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INPUT_PORTS_END
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//-------------------------------------------------
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// input_ports - device-specific input ports
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//-------------------------------------------------
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ioport_constructor c64_magic_formel_cartridge_device::device_input_ports() const
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{
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return INPUT_PORTS_NAME( c64_magic_formel );
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}
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//**************************************************************************
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// LIVE DEVICE
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//**************************************************************************
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//-------------------------------------------------
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// c64_magic_formel_cartridge_device - constructor
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//-------------------------------------------------
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c64_magic_formel_cartridge_device::c64_magic_formel_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
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device_t(mconfig, C64_MAGIC_FORMEL, "C64 Magic Formel cartridge", tag, owner, clock),
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device_c64_expansion_card_interface(mconfig, *this),
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m_pia(*this, MC6821_TAG),
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m_rom_bank(0),
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m_ram_bank(0),
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m_pb7_ff(0),
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m_cb2_ff(0),
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m_rom_oe(0),
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m_ram_oe(0),
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m_pb7(1)
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{
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}
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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void c64_magic_formel_cartridge_device::device_start()
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{
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// state saving
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save_item(NAME(m_rom_bank));
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save_item(NAME(m_ram_bank));
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save_item(NAME(m_pb7_ff));
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save_item(NAME(m_cb2_ff));
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save_item(NAME(m_rom_oe));
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save_item(NAME(m_ram_oe));
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save_item(NAME(m_pb7));
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}
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//-------------------------------------------------
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// device_reset - device-specific reset
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//-------------------------------------------------
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void c64_magic_formel_cartridge_device::device_reset()
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{
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m_rom_bank = 0;
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m_ram_bank = 0;
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m_pb7_ff = 0;
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m_cb2_ff = 0;
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m_rom_oe = 0;
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m_ram_oe = 0;
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m_pb7 = 1;
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}
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//-------------------------------------------------
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// c64_cd_r - cartridge data read
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//-------------------------------------------------
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UINT8 c64_magic_formel_cartridge_device::c64_cd_r(address_space &space, offs_t offset, UINT8 data, int ba, int roml, int romh, int io1, int io2)
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{
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if (!romh && !m_rom_oe)
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{
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UINT8 bank = m_pb7_ff ? m_rom_bank : 0;
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offs_t addr = (bank << 13) | (offset & 0x1fff);
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data = m_romh[addr];
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}
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else if (!io1 && !PA4)
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{
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offs_t addr = (m_ram_bank << 8) | (offset & 0xff);
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data = m_ram[addr];
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}
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return data;
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}
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//-------------------------------------------------
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// c64_cd_w - cartridge data write
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//-------------------------------------------------
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void c64_magic_formel_cartridge_device::c64_cd_w(address_space &space, offs_t offset, UINT8 data, int ba, int roml, int romh, int io1, int io2)
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{
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if (!io1)
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{
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offs_t addr = (m_ram_bank << 8) | (offset & 0xff);
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m_ram[addr] = data;
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}
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else if (!io2 && !(m_cb2_ff & PA4))
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{
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offs_t addr = (offset >> 6) & 0x03;
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UINT8 new_data = (BIT(data, 1) << 7) | (offset & 0x3f);
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m_pia->write(space, addr, new_data);
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}
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else if (offset == 0x0001)
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{
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m_pb7_ff = 0;
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}
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}
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//-------------------------------------------------
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// c64_game_r - GAME read
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//-------------------------------------------------
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int c64_magic_formel_cartridge_device::c64_game_r(offs_t offset, int ba, int rw, int hiram)
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{
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return !(ba & rw & ((offset & 0xe000) == 0xe000) & !(m_pb7 & m_cb2_ff));
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}
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