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// 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<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;
}
|