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+// license:BSD-3-Clause
+// copyright-holders:hap
+// thanks-to:Berger
+/******************************************************************************
+*
+* fidel_cc1.cpp, subdriver of machine/fidelbase.cpp, machine/chessbase.cpp
+
+TODO:
+- driver is untested, but it should be easy to get working when a good dump
+ shows up (or a rom of CC3, even)
+
+*******************************************************************************
+
+Fidelity Chess Challenger (1)
+-------------------
+This is the world's 1st released dedicated chess computer. Oddly, the rows/columns
+are reversed: left to right is 1-8, bottom to top is A-H, eg. pawn from d2 to d4
+is 4b to 4d here.
+
+NEC 8080AF @ 2MHz(18MHz XTAL through a 8224)
+Everything goes via a NEC B8228, its special features are unused.
+NEC 2316A ROM(2KB), 4*2101AL RAM(0.5KB total)
+8255C for I/O, 4*7seg display + 2 extra leds, 12-key keypad
+
+Chess Challenger 3 is on the same hardware, but with double ROM size, and they
+corrected the reversed chess notation. It was also offered as an upgrade to CC1.
+
+******************************************************************************/
+
+#include "emu.h"
+#include "includes/fidelbase.h"
+
+#include "cpu/i8085/i8085.h"
+#include "machine/i8255.h"
+
+// internal artwork
+#include "fidel_cc1.lh" // clickable
+
+
+namespace {
+
+class cc1_state : public fidelbase_state
+{
+public:
+ cc1_state(const machine_config &mconfig, device_type type, const char *tag) :
+ fidelbase_state(mconfig, type, tag),
+ m_ppi8255(*this, "ppi8255"),
+ m_delay(*this, "delay")
+ { }
+
+ // machine drivers
+ void cc1(machine_config &config);
+
+private:
+ // devices/pointers
+ required_device<i8255_device> m_ppi8255;
+ optional_device<timer_device> m_delay;
+
+ // address maps
+ void main_map(address_map &map);
+ void main_io(address_map &map);
+
+ // I/O handlers
+ void prepare_display();
+ DECLARE_READ8_MEMBER(ppi_porta_r);
+ DECLARE_WRITE8_MEMBER(ppi_portb_w);
+ DECLARE_WRITE8_MEMBER(ppi_portc_w);
+};
+
+
+/******************************************************************************
+ Devices, I/O
+******************************************************************************/
+
+// misc handlers
+
+void cc1_state::prepare_display()
+{
+ // 4 7segs + 2 leds
+ set_display_segmask(0xf, 0x7f);
+ display_matrix(7, 6, m_7seg_data, m_led_select);
+}
+
+
+// I8255 PPI
+
+READ8_MEMBER(cc1_state::ppi_porta_r)
+{
+ // 74148(priority encoder) I0-I7: inputs
+ // d0-d2: 74148 S0-S2, d3: 74148 GS
+ // d5-d7: more inputs (direct)
+ u8 data = (count_leading_zeros(m_inp_matrix[0]->read()) - 24) | (~m_inp_matrix[1]->read() << 5 & 0xe0);
+
+ // d4: 555 Q
+ return data | ((m_delay->enabled()) ? 0x10 : 0);
+}
+
+WRITE8_MEMBER(cc1_state::ppi_portb_w)
+{
+ // d0-d6: digit segment data
+ m_7seg_data = bitswap<7>(data,0,1,2,3,4,5,6);
+ prepare_display();
+}
+
+WRITE8_MEMBER(cc1_state::ppi_portc_w)
+{
+ // d6: trigger monostable 555 (R=15K, C=1uF)
+ if (~data & m_led_select & 0x40 && !m_delay->enabled())
+ m_delay->adjust(attotime::from_msec(17));
+
+ // d0-d3: digit select
+ // d4: check led, d5: lose led
+ m_led_select = data;
+ prepare_display();
+}
+
+
+
+/******************************************************************************
+ Address Maps
+******************************************************************************/
+
+void cc1_state::main_map(address_map &map)
+{
+ map.global_mask(0x1fff);
+ map(0x0000, 0x0fff).rom();
+ map(0x1000, 0x11ff).mirror(0x0e00).ram();
+}
+
+void cc1_state::main_io(address_map &map)
+{
+ map.global_mask(0x0f);
+ map(0x00, 0x03).mirror(0x04).rw(m_ppi8255, FUNC(i8255_device::read), FUNC(i8255_device::write));
+}
+
+
+
+/******************************************************************************
+ Input Ports
+******************************************************************************/
+
+static INPUT_PORTS_START( cc1 )
+ PORT_START("IN.0")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("1") PORT_CODE(KEYCODE_1)
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("2") PORT_CODE(KEYCODE_2)
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("3") PORT_CODE(KEYCODE_3)
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("4") PORT_CODE(KEYCODE_4)
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("5") PORT_CODE(KEYCODE_5)
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("6") PORT_CODE(KEYCODE_6)
+ PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("7") PORT_CODE(KEYCODE_7)
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("8") PORT_CODE(KEYCODE_8)
+
+ PORT_START("IN.1")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("9") PORT_CODE(KEYCODE_9)
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("0") PORT_CODE(KEYCODE_0)
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("-") PORT_CODE(KEYCODE_MINUS)
+
+ PORT_START("RESET")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("RE") PORT_CODE(KEYCODE_R) PORT_CHANGED_MEMBER(DEVICE_SELF, cc1_state, reset_button, nullptr)
+INPUT_PORTS_END
+
+
+
+/******************************************************************************
+ Machine Drivers
+******************************************************************************/
+
+void cc1_state::cc1(machine_config &config)
+{
+ /* basic machine hardware */
+ I8080A(config, m_maincpu, 18_MHz_XTAL/9);
+ m_maincpu->set_addrmap(AS_PROGRAM, &cc1_state::main_map);
+ m_maincpu->set_addrmap(AS_IO, &cc1_state::main_io);
+
+ I8255(config, m_ppi8255);
+ m_ppi8255->in_pa_callback().set(FUNC(cc1_state::ppi_porta_r));
+ m_ppi8255->out_pb_callback().set(FUNC(cc1_state::ppi_portb_w));
+ m_ppi8255->tri_pb_callback().set_constant(0);
+ m_ppi8255->out_pc_callback().set(FUNC(cc1_state::ppi_portc_w));
+
+ TIMER(config, "delay").configure_generic(timer_device::expired_delegate());
+
+ TIMER(config, "display_decay").configure_periodic(FUNC(cc1_state::display_decay_tick), attotime::from_msec(1));
+ config.set_default_layout(layout_fidel_cc1);
+}
+
+
+
+/******************************************************************************
+ ROM Definitions
+******************************************************************************/
+
+ROM_START( cc1 )
+ ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
+ ROM_LOAD( "d2316ac_011", 0x0000, 0x0800, BAD_DUMP CRC(e27f9816) SHA1(ad9881b3bf8341829a27e86de27805fc2ccb5f7d) ) // A4 line was broken
+ROM_END
+
+} // anonymous namespace
+
+
+
+/******************************************************************************
+ Drivers
+******************************************************************************/
+
+// YEAR NAME PARENT CMP MACHINE INPUT STATE INIT COMPANY, FULLNAME, FLAGS
+CONS( 1977, cc1, 0, 0, cc1, cc1, cc1_state, empty_init, "Fidelity Electronics", "Chess Challenger", MACHINE_SUPPORTS_SAVE | MACHINE_CLICKABLE_ARTWORK | MACHINE_NO_SOUND_HW | MACHINE_NOT_WORKING )