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diff --git a/src/mame/drivers/sc1.c b/src/mame/drivers/sc1.c
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+// license:BSD-3-Clause
+// copyright-holders:Sandro Ronco
+/***************************************************************************
+
+ Schachcomputer SC1
+
+ 12/05/2009 Skeleton driver.
+
+ToDo:
+- speaker
+- LEDs
+- 7seg sometimes flashes
+
+Port 80-83 could be a device
+
+This happens at the start:
+'maincpu' (04EF): unmapped i/o memory write to 0081 = 0F & FF
+'maincpu' (04F3): unmapped i/o memory write to 0083 = CF & FF
+'maincpu' (04F7): unmapped i/o memory write to 0083 = BB & FF
+'maincpu' (04FB): unmapped i/o memory write to 0082 = 01 & FF
+'maincpu' (0523): unmapped i/o memory write to 00FC = 02 & FF **
+'maincpu' (0523): unmapped i/o memory write to 00FC = 04 & FF **
+
+** These two happen for a while (making a tone from a speaker?)
+
+Then:
+'maincpu' (0523): unmapped i/o memory write to 00FC = 00 & FF
+'maincpu' (0075): unmapped i/o memory write to 0080 = 02 & FF
+'maincpu' (0523): unmapped i/o memory write to 00FC = 20 & FF
+
+Then this happens continuously:
+Port 80 out - 00, 02, FF
+Port FC out - 00, 01, 02, 04, 08, 10, 20, 40, 80 (selecting rows?)
+Port 80 in - upper byte = 20 thru 26
+Port 82 in - upper byte = 0 thru 7
+
+****************************************************************************/
+
+#include "emu.h"
+#include "cpu/z80/z80.h"
+#include "sound/speaker.h"
+#include "machine/z80pio.h"
+#include "sc1.lh"
+
+
+class sc1_state : public driver_device
+{
+public:
+ sc1_state(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag),
+ m_maincpu(*this, "maincpu"),
+ m_speaker(*this, "speaker")
+ { }
+
+ required_device<cpu_device> m_maincpu;
+ required_device<speaker_sound_device> m_speaker;
+
+ DECLARE_WRITE8_MEMBER( matrix_w );
+ DECLARE_WRITE8_MEMBER( pio_port_a_w );
+ DECLARE_READ8_MEMBER( pio_port_b_r );
+
+ UINT8 m_matrix;
+};
+
+/***************************************************************************
+
+ Display
+
+***************************************************************************/
+
+WRITE8_MEMBER( sc1_state::pio_port_a_w )
+{
+ UINT8 digit = BITSWAP8( data,3,4,6,0,1,2,7,5 );
+
+ if (m_matrix & 0x04)
+ output_set_digit_value(3, digit & 0x7f);
+ if (m_matrix & 0x08)
+ output_set_digit_value(2, digit & 0x7f);
+ if (m_matrix & 0x10)
+ output_set_digit_value(1, digit & 0x7f);
+ if (m_matrix & 0x20)
+ output_set_digit_value(0, digit & 0x7f);
+}
+
+
+/***************************************************************************
+
+ Keyboard
+
+***************************************************************************/
+
+WRITE8_MEMBER( sc1_state::matrix_w )
+{
+ m_matrix = data;
+}
+
+READ8_MEMBER( sc1_state::pio_port_b_r )
+{
+ UINT8 data = 0;
+
+ if (m_matrix & 0x01)
+ data |= ioport("LINE1")->read();
+ if (m_matrix & 0x02)
+ data |= ioport("LINE2")->read();
+ if (m_matrix & 0x04)
+ data |= ioport("LINE3")->read();
+ if (m_matrix & 0x08)
+ data |= ioport("LINE4")->read();
+ if (m_matrix & 0x10)
+ data |= ioport("LINE5")->read();
+ if (m_matrix & 0x20)
+ data |= ioport("LINE6")->read();
+ if (m_matrix & 0x40)
+ data |= ioport("LINE7")->read();
+ if (m_matrix & 0x80)
+ data |= ioport("LINE8")->read();
+
+ return data;
+}
+
+
+static ADDRESS_MAP_START(sc1_mem, AS_PROGRAM, 8, sc1_state)
+ ADDRESS_MAP_UNMAP_HIGH
+ AM_RANGE( 0x0000, 0x0fff ) AM_ROM
+ AM_RANGE( 0x4000, 0x43ff ) AM_RAM
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START(sc1_io, AS_IO, 8, sc1_state)
+ ADDRESS_MAP_UNMAP_HIGH
+ ADDRESS_MAP_GLOBAL_MASK(0xff)
+ AM_RANGE(0x80, 0x83) AM_DEVREADWRITE("z80pio", z80pio_device, read_alt, write_alt)
+ AM_RANGE(0xfc, 0xfc) AM_WRITE(matrix_w)
+ADDRESS_MAP_END
+
+/* Input ports */
+static INPUT_PORTS_START( sc1 )
+ PORT_START("LINE1")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_UNUSED) PORT_UNUSED
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("D4") PORT_CODE(KEYCODE_4) PORT_CODE(KEYCODE_D)
+
+ PORT_START("LINE2")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("B2") PORT_CODE(KEYCODE_2) PORT_CODE(KEYCODE_B)
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("F6") PORT_CODE(KEYCODE_6) PORT_CODE(KEYCODE_F)
+
+ PORT_START("LINE3")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("C3") PORT_CODE(KEYCODE_3) PORT_CODE(KEYCODE_C)
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("G7") PORT_CODE(KEYCODE_7) PORT_CODE(KEYCODE_G)
+
+ PORT_START("LINE4")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("A1") PORT_CODE(KEYCODE_1) PORT_CODE(KEYCODE_A)
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("E5") PORT_CODE(KEYCODE_5) PORT_CODE(KEYCODE_E)
+
+ PORT_START("LINE5")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("H8") PORT_CODE(KEYCODE_8) PORT_CODE(KEYCODE_H)
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("CE") PORT_CODE(KEYCODE_DEL)
+
+ PORT_START("LINE6")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("K") PORT_CODE(KEYCODE_K)
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("ENT") PORT_CODE(KEYCODE_ENTER)
+
+ PORT_START("LINE7")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("P") PORT_CODE(KEYCODE_O)
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("W/S") PORT_CODE(KEYCODE_W)
+
+ PORT_START("LINE8")
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("T") PORT_CODE(KEYCODE_T)
+ PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("C") PORT_CODE(KEYCODE_M)
+INPUT_PORTS_END
+
+
+static MACHINE_CONFIG_START( sc1, sc1_state )
+ /* basic machine hardware */
+ MCFG_CPU_ADD("maincpu",Z80, XTAL_4MHz)
+ MCFG_CPU_PROGRAM_MAP(sc1_mem)
+ MCFG_CPU_IO_MAP(sc1_io)
+
+ /* video hardware */
+ MCFG_DEFAULT_LAYOUT(layout_sc1)
+
+ /* devices */
+ MCFG_DEVICE_ADD("z80pio", Z80PIO, XTAL_4MHz)
+ MCFG_Z80PIO_OUT_PA_CB(WRITE8(sc1_state, pio_port_a_w))
+ MCFG_Z80PIO_IN_PB_CB(READ8(sc1_state, pio_port_b_r))
+
+ /* sound hardware */
+ MCFG_SPEAKER_STANDARD_MONO("mono")
+ MCFG_SOUND_ADD("speaker", SPEAKER_SOUND, 0)
+ MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)
+MACHINE_CONFIG_END
+
+/* ROM definition */
+ROM_START( sc1 )
+ ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
+ ROM_LOAD( "sc1.rom", 0x0000, 0x1000, CRC(26965b23) SHA1(01568911446eda9f05ec136df53da147b7c6f2bf))
+ROM_END
+
+/* Driver */
+
+/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */
+COMP( 1989, sc1, 0, 0, sc1, sc1, driver_device, 0, "VEB Mikroelektronik Erfurt", "Schachcomputer SC1", MACHINE_NOT_WORKING | MACHINE_NO_SOUND )