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+// license:BSD-3-Clause
+// copyright-holders:hap
+// thanks-to:Berger
+/******************************************************************************
+*
+* ave_arb.cpp, subdriver of machine/chessbase.cpp
+
+AVE Micro Systems ARB chess computer driver, in some regions redistributed
+by Chafitz, and in Germany by Sandy Electronic.
+
+*******************************************************************************
+
+Auto Response Board (ARB) overview:
+- R6502P CPU @ 2MHz(4MHz XTAL), R6522P VIA
+- 2KB RAM(4*2114), cartridge port
+- magnetic chessboard, 8*8+12 leds
+- PCB label AV001C01 REV A
+
+The electronic magnetic chessboard is the first of is kind. AVE later licensed
+it to Fidelity (see fidel_elite.cpp).
+ARB is a romless system, the program ROM is on a cartridge.
+
+Known modules (*denotes not dumped yet):
+- Sargon 2.5
+- *Grand Master Series 3
+- *Grand Master Series 3.5
+- *Grand Master Series 4.0
+
+Newer modules included button label stickers for OPTIONS, Verify, Take Back, Clear.
+
+******************************************************************************/
+
+#include "emu.h"
+#include "includes/chessbase.h"
+
+#include "cpu/m6502/m6502.h"
+#include "machine/6522via.h"
+#include "machine/nvram.h"
+#include "sound/dac.h"
+#include "sound/volt_reg.h"
+#include "speaker.h"
+#include "bus/generic/slot.h"
+#include "bus/generic/carts.h"
+#include "softlist.h"
+
+// internal artwork
+#include "ave_arb.lh" // clickable
+
+
+namespace {
+
+class arb_state : public chessbase_state
+{
+public:
+ arb_state(const machine_config &mconfig, device_type type, const char *tag) :
+ chessbase_state(mconfig, type, tag),
+ m_maincpu(*this, "maincpu"),
+ m_via(*this, "via"),
+ m_dac(*this, "dac"),
+ m_cart(*this, "cartslot")
+ { }
+
+ // halt button is tied to NMI, reset button to RESET(but only if halt button is held)
+ void update_reset() { m_maincpu->set_input_line(INPUT_LINE_RESET, (m_inp_matrix[9]->read() == 3) ? ASSERT_LINE : CLEAR_LINE); }
+ DECLARE_INPUT_CHANGED_MEMBER(reset_button) { update_reset(); }
+ DECLARE_INPUT_CHANGED_MEMBER(halt_button) { m_maincpu->set_input_line(M6502_NMI_LINE, newval ? ASSERT_LINE : CLEAR_LINE); update_reset(); }
+
+ // machine drivers
+ void arb(machine_config &config);
+
+private:
+ // devices/pointers
+ required_device<cpu_device> m_maincpu;
+ required_device<via6522_device> m_via;
+ required_device<dac_bit_interface> m_dac;
+ required_device<generic_slot_device> m_cart;
+
+ // address maps
+ void main_map(address_map &map);
+
+ // cartridge
+ DECLARE_DEVICE_IMAGE_LOAD_MEMBER(cartridge);
+ DECLARE_READ8_MEMBER(cartridge_r);
+ u32 m_cart_mask;
+
+ // I/O handlers
+ void prepare_display();
+ DECLARE_WRITE8_MEMBER(leds_w);
+ DECLARE_WRITE8_MEMBER(control_w);
+ DECLARE_READ8_MEMBER(input_r);
+};
+
+
+/******************************************************************************
+ Devices, I/O
+******************************************************************************/
+
+// cartridge
+
+DEVICE_IMAGE_LOAD_MEMBER(arb_state, cartridge)
+{
+ u32 size = m_cart->common_get_size("rom");
+ m_cart_mask = ((1 << (31 - count_leading_zeros(size))) - 1) & 0x7fff;
+
+ m_cart->rom_alloc(size, GENERIC_ROM8_WIDTH, ENDIANNESS_LITTLE);
+ m_cart->common_load_rom(m_cart->get_rom_base(), size, "rom");
+
+ // extra ram (optional)
+ if (image.get_feature("ram"))
+ m_maincpu->space(AS_PROGRAM).install_ram(0x0800, 0x0fff, 0x1000, nullptr);
+
+ return image_init_result::PASS;
+}
+
+READ8_MEMBER(arb_state::cartridge_r)
+{
+ return m_cart->read_rom(offset & m_cart_mask);
+}
+
+
+// R6522 ports
+
+void arb_state::prepare_display()
+{
+ // 12 led column data lines via 3 7475
+ u16 mask = 0;
+ mask |= (m_led_select & 1) ? 0xf00 : 0;
+ mask |= (m_led_select & 2) ? 0x0ff : 0;
+
+ m_led_data = (m_led_data & ~mask) | ((m_led_latch << 8 | m_led_latch) & mask);
+ display_matrix(12, 9+1, m_led_data, m_inp_mux | 0x200);
+}
+
+WRITE8_MEMBER(arb_state::leds_w)
+{
+ // PA0-PA7: led latch input
+ m_led_latch = ~data & 0xff;
+ prepare_display();
+}
+
+WRITE8_MEMBER(arb_state::control_w)
+{
+ // PB0-PB3: 74145 A-D
+ // 74145 0-8: input mux, led row select
+ m_inp_mux = 1 << (data & 0xf) & 0x1ff;
+
+ // PB4,PB5: led group select
+ m_led_select = data >> 4 & 3;
+ prepare_display();
+
+ // PB7: speaker out
+ m_dac->write(BIT(data, 7));
+}
+
+READ8_MEMBER(arb_state::input_r)
+{
+ // PA0-PA7: multiplexed inputs
+ return ~read_inputs(9);
+}
+
+
+
+/******************************************************************************
+ Address Maps
+******************************************************************************/
+
+void arb_state::main_map(address_map &map)
+{
+ // external slot is A0-A14, potential bus conflict with RAM/VIA
+ map(0x0000, 0x7fff).mirror(0x8000).r(FUNC(arb_state::cartridge_r));
+ map(0x0000, 0x07ff).mirror(0x1000).ram().share("nvram");
+ map(0x8000, 0x800f).mirror(0x1ff0).rw(m_via, FUNC(via6522_device::read), FUNC(via6522_device::write));
+}
+
+
+
+/******************************************************************************
+ Input Ports
+******************************************************************************/
+
+static INPUT_PORTS_START( arb )
+ PORT_INCLUDE( generic_cb_magnets )
+
+ PORT_START("IN.8")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_H) PORT_CODE(KEYCODE_7) PORT_NAME("Hint / Black")
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_V) PORT_CODE(KEYCODE_6) PORT_NAME("Variable / Clear / White / 6")
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_M) PORT_CODE(KEYCODE_5) PORT_NAME("Monitor / Take Back / King / 5")
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_S) PORT_CODE(KEYCODE_4) PORT_NAME("Self Play / Verify / Queen / 4")
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_B) PORT_CODE(KEYCODE_3) PORT_NAME("Change Board / Rook / 3")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_C) PORT_CODE(KEYCODE_2) PORT_NAME("Change Color / Bishop / 2")
+ PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_L) PORT_CODE(KEYCODE_1) PORT_NAME("Change Level / Knight / 1")
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_CODE(KEYCODE_N) PORT_CODE(KEYCODE_0) PORT_NAME("New Game / Options / Pawn / 0")
+
+ PORT_START("IN.9")
+ PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYPAD ) PORT_CODE(KEYCODE_R) PORT_CODE(KEYCODE_F2) PORT_NAME("Reset") PORT_CHANGED_MEMBER(DEVICE_SELF, arb_state, reset_button, nullptr)
+ PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYPAD ) PORT_CODE(KEYCODE_T) PORT_CODE(KEYCODE_F2) PORT_NAME("Halt") PORT_CHANGED_MEMBER(DEVICE_SELF, arb_state, halt_button, nullptr)
+INPUT_PORTS_END
+
+
+
+/******************************************************************************
+ Machine Drivers
+******************************************************************************/
+
+void arb_state::arb(machine_config &config)
+{
+ /* basic machine hardware */
+ M6502(config, m_maincpu, 4_MHz_XTAL/2);
+ m_maincpu->set_addrmap(AS_PROGRAM, &arb_state::main_map);
+
+ VIA6522(config, m_via, 4_MHz_XTAL/4);
+ m_via->writepa_handler().set(FUNC(arb_state::leds_w));
+ m_via->writepb_handler().set(FUNC(arb_state::control_w));
+ m_via->readpa_handler().set(FUNC(arb_state::input_r));
+ m_via->irq_handler().set_inputline(m_maincpu, M6502_IRQ_LINE);
+
+ NVRAM(config, "nvram", nvram_device::DEFAULT_ALL_0);
+
+ TIMER(config, "display_decay").configure_periodic(FUNC(arb_state::display_decay_tick), attotime::from_msec(1));
+ config.set_default_layout(layout_ave_arb);
+
+ /* sound hardware */
+ SPEAKER(config, "speaker").front_center();
+ DAC_1BIT(config, m_dac).add_route(ALL_OUTPUTS, "speaker", 0.25);
+ VOLTAGE_REGULATOR(config, "vref").add_route(0, "dac", 1.0, DAC_VREF_POS_INPUT);
+
+ /* cartridge */
+ GENERIC_CARTSLOT(config, m_cart, generic_plain_slot, "arb", "bin");
+ m_cart->set_device_load(device_image_load_delegate(&arb_state::device_image_load_cartridge, this));
+ m_cart->set_must_be_loaded(true);
+
+ SOFTWARE_LIST(config, "cart_list").set_original("arb");
+}
+
+
+
+/******************************************************************************
+ ROM Definitions
+******************************************************************************/
+
+ROM_START( arb )
+ ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASE00 )
+ // none here, it's in the module slot
+ROM_END
+
+} // anonymous namespace
+
+
+
+/******************************************************************************
+ Drivers
+******************************************************************************/
+
+/* YEAR NAME PARENT CMP MACHINE INPUT CLASS INIT COMPANY, FULLNAME, FLAGS */
+CONS( 1980, arb, 0, 0, arb, arb, arb_state, empty_init, "AVE Micro Systems", "Auto Response Board", MACHINE_SUPPORTS_SAVE | MACHINE_CLICKABLE_ARTWORK | MACHINE_IMPERFECT_CONTROLS )