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-rw-r--r--src/devices/bus/c64/partner.c208
1 files changed, 208 insertions, 0 deletions
diff --git a/src/devices/bus/c64/partner.c b/src/devices/bus/c64/partner.c
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+++ b/src/devices/bus/c64/partner.c
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+// 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;
+}