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-rw-r--r--src/devices/bus/c64/c128_partner.cpp250
1 files changed, 250 insertions, 0 deletions
diff --git a/src/devices/bus/c64/c128_partner.cpp b/src/devices/bus/c64/c128_partner.cpp
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index 00000000000..00f5a8e2cb9
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+++ b/src/devices/bus/c64/c128_partner.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ Timeworks PARTNER 128 cartridge emulation
+
+**********************************************************************/
+
+/*
+
+ PCB Layout
+ ----------
+
+ |---------------|
+ |LS74 SW * |
+ |LS09 LS273|
+ |LS139 RAM |
+ |LS133 |
+ | LS240 |
+ |LS33 ROM |
+ |LS09 |
+ |||||||||||||||
+
+ ROM - Toshiba TMM24128AP 16Kx8 EPROM (blank label)
+ RAM - Sony CXK5864PN-15L 8Kx8 SRAM
+ SW - push button switch
+ * - solder point for joystick port dongle
+
+*/
+
+#include "c128_partner.h"
+
+
+
+//**************************************************************************
+// DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type C128_PARTNER = &device_creator<partner128_t>;
+
+
+//-------------------------------------------------
+// INPUT_PORTS( c128_partner )
+//-------------------------------------------------
+
+WRITE_LINE_MEMBER( partner128_t::nmi_w )
+{
+ if (state)
+ {
+ m_ls74_q1 = 1;
+ }
+}
+
+static INPUT_PORTS_START( c128_partner )
+ PORT_START("NMI")
+ PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_OTHER ) PORT_NAME("Menu") PORT_CODE(KEYCODE_END) PORT_WRITE_LINE_DEVICE_MEMBER(DEVICE_SELF, partner128_t, nmi_w)
+INPUT_PORTS_END
+
+
+//-------------------------------------------------
+// input_ports - device-specific input ports
+//-------------------------------------------------
+
+ioport_constructor partner128_t::device_input_ports() const
+{
+ return INPUT_PORTS_NAME( c128_partner );
+}
+
+
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// partner128_t - constructor
+//-------------------------------------------------
+
+partner128_t::partner128_t(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, C128_PARTNER, "PARTNER 128", tag, owner, clock, "c128_partner", __FILE__),
+ device_c64_expansion_card_interface(mconfig, *this),
+ //device_vcs_control_port_interface(mconfig, *this),
+ m_ram(*this, "ram"),
+ m_ram_a12_a7(0),
+ m_ls74_cd(0),
+ m_ls74_q1(0),
+ m_ls74_q2(0),
+ m_joyb2(0)
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void partner128_t::device_start()
+{
+ // allocate memory
+ m_ram.allocate(0x2000);
+
+ // simulate the 16.7ms pulse from CIA1 PB2 that would arrive thru the joystick port dongle
+ t_joyb2 = timer_alloc();
+ t_joyb2->adjust(attotime::from_msec(16), 0, attotime::from_msec(16));
+
+ // state saving
+ save_item(NAME(m_ram_a12_a7));
+ save_item(NAME(m_ls74_cd));
+ save_item(NAME(m_ls74_q1));
+ save_item(NAME(m_ls74_q2));
+ save_item(NAME(m_joyb2));
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void partner128_t::device_reset()
+{
+ m_ram_a12_a7 = 0;
+
+ m_ls74_cd = 0;
+ m_ls74_q1 = 0;
+ m_ls74_q2 = 0;
+
+ nmi_w(CLEAR_LINE);
+}
+
+
+//-------------------------------------------------
+// device_timer -
+//-------------------------------------------------
+
+void partner128_t::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
+{
+ if (m_ls74_cd)
+ {
+ m_ls74_q2 = m_ls74_q1;
+
+ nmi_w(m_ls74_q2 ? ASSERT_LINE : CLEAR_LINE);
+ }
+}
+
+
+//-------------------------------------------------
+// c64_cd_r - cartridge data read
+//-------------------------------------------------
+
+UINT8 partner128_t::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)
+ {
+ data = m_roml[offset & 0x3fff];
+ }
+
+ if (!io1)
+ {
+ if (BIT(offset, 7))
+ {
+ data = m_roml[offset & 0x3fff];
+
+ if (m_ls74_cd)
+ {
+ m_ls74_q1 = 0;
+ }
+ }
+ else
+ {
+ data = m_ram[(m_ram_a12_a7 << 7) | (offset & 0x7f)];
+ }
+ }
+
+ if (m_ls74_q2 && ((offset & 0xfffa) == 0xfffa))
+ {
+ // override the 8502 NMI/IRQ vectors with 0xdede
+ data = 0xde;
+ }
+
+ return data;
+}
+
+
+//-------------------------------------------------
+// c64_cd_w - cartridge data write
+//-------------------------------------------------
+
+void partner128_t::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)
+ {
+ if (BIT(offset, 7))
+ {
+ /*
+
+ bit description
+
+ 0 RAM A7
+ 1 RAM A8
+ 2 RAM A9
+ 3 RAM A10
+ 4 RAM A11
+ 5 RAM A12
+ 6 LS74 1Cd,2Cd
+ 7 N/C
+
+ */
+
+ m_ram_a12_a7 = data & 0x3f;
+
+ m_ls74_cd = BIT(data, 6);
+
+ if (!m_ls74_cd)
+ {
+ m_ls74_q1 = 0;
+ m_ls74_q2 = 0;
+
+ nmi_w(CLEAR_LINE);
+ }
+ }
+ else
+ {
+ m_ram[(m_ram_a12_a7 << 7) | (offset & 0x7f)] = data;
+ }
+ }
+
+ if (sphi2 && ((offset & 0xfff0) == 0xd600))
+ {
+ m_ram[(m_ram_a12_a7 << 7) | (offset & 0x7f)] = data;
+ }
+}
+
+
+//-------------------------------------------------
+// vcs_joy_w - joystick write
+//-------------------------------------------------
+
+void partner128_t::vcs_joy_w(UINT8 data)
+{
+ int joyb2 = BIT(data, 2);
+
+ if (!m_joyb2 && joyb2 && m_ls74_cd)
+ {
+ m_ls74_q2 = m_ls74_q1;
+
+ nmi_w(m_ls74_q2 ? ASSERT_LINE : CLEAR_LINE);
+ }
+
+ m_joyb2 = joyb2;
+}