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Diffstat (limited to 'src/mess/drivers/beta.c')
-rw-r--r--src/mess/drivers/beta.c294
1 files changed, 294 insertions, 0 deletions
diff --git a/src/mess/drivers/beta.c b/src/mess/drivers/beta.c
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+++ b/src/mess/drivers/beta.c
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+/***************************************************************************
+
+ Beta Computer
+
+ http://retro.hansotten.nl/index.php?page=beta-computer
+
+ When first started, press G to begin.
+
+ Pasting:
+ 0-F : as is
+ M (inc) : ^
+ AD : -
+ DA : =
+ GO : X
+
+ Test Paste:
+ X-0011=11^22^33^44^55^66^77^88^99^-0011
+ Now press M to confirm the data has been entered.
+
+****************************************************************************/
+
+/*
+
+ TODO:
+
+ - write EPROM back to file
+
+*/
+
+#include "includes/beta.h"
+#include "beta.lh"
+
+/* Memory Maps */
+
+static ADDRESS_MAP_START( beta_mem, AS_PROGRAM, 8, beta_state )
+ AM_RANGE(0x0000, 0x007f) AM_MIRROR(0x7f00) AM_RAM // 6532 RAM
+ AM_RANGE(0x0080, 0x00ff) AM_MIRROR(0x7f00) AM_DEVREADWRITE_LEGACY(M6532_TAG, riot6532_r, riot6532_w)
+ AM_RANGE(0x8000, 0x87ff) AM_MIRROR(0x7800) AM_ROM
+ADDRESS_MAP_END
+
+/* Input Ports */
+
+INPUT_CHANGED_MEMBER( beta_state::trigger_reset )
+{
+ m_maincpu->set_input_line(INPUT_LINE_RESET, newval ? CLEAR_LINE : ASSERT_LINE);
+}
+
+static INPUT_PORTS_START( beta )
+ PORT_START("Q6")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_A) PORT_CHAR('A')
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_1) PORT_CHAR('1')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_4) PORT_CHAR('4')
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_7) PORT_CHAR('7')
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("GO") PORT_CODE(KEYCODE_G) PORT_CODE(KEYCODE_X) PORT_CHAR('X')
+ PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )
+
+ PORT_START("Q7")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_0) PORT_CHAR('0')
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_2) PORT_CHAR('2')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_5) PORT_CHAR('5')
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_8) PORT_CHAR('8')
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_M) PORT_CODE(KEYCODE_UP) PORT_CHAR('^')
+ PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )
+
+ PORT_START("Q8")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_B) PORT_CHAR('B')
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_3) PORT_CHAR('3')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_6) PORT_CHAR('6')
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_9) PORT_CHAR('9')
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("DA") PORT_CODE(KEYCODE_EQUALS) PORT_CHAR('=')
+ PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )
+
+ PORT_START("Q9")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_C) PORT_CHAR('C')
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_D) PORT_CHAR('D')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_E) PORT_CHAR('E')
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_F) PORT_CHAR('F')
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("AD") PORT_CODE(KEYCODE_MINUS) PORT_CHAR('-')
+ PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )
+
+ PORT_START("SPECIAL")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("RESET") PORT_CODE(KEYCODE_R) PORT_CHANGED_MEMBER(DEVICE_SELF, beta_state, trigger_reset, 0)
+INPUT_PORTS_END
+
+/* M6532 Interface */
+
+static TIMER_CALLBACK( led_refresh )
+{
+ beta_state *state = machine.driver_data<beta_state>();
+
+ if (state->m_ls145_p < 6)
+ {
+ output_set_digit_value(state->m_ls145_p, state->m_segment);
+ }
+}
+
+READ8_MEMBER( beta_state::riot_pa_r )
+{
+ /*
+
+ bit description
+
+ PA0 2716 D0, segment D, key bit 0
+ PA1 2716 D1, segment E, key bit 1
+ PA2 2716 D2, segment C, key bit 2
+ PA3 2716 D3, segment G, key bit 3
+ PA4 2716 D4, segment F, key bit 4
+ PA5 2716 D5, segment B
+ PA6 2716 D6, segment A
+ PA7 2716 D7
+
+ */
+
+ UINT8 data = 0xff;
+
+ switch (m_ls145_p)
+ {
+ case 6: data &= ioport("Q6")->read(); break;
+ case 7: data &= ioport("Q7")->read(); break;
+ case 8: data &= ioport("Q8")->read(); break;
+ case 9: data &= ioport("Q9")->read(); break;
+ default:
+ if (!m_eprom_oe && !m_eprom_ce)
+ {
+ data = memregion(EPROM_TAG)->base()[m_eprom_addr & 0x7ff];
+ popmessage("EPROM read %04x = %02x\n", m_eprom_addr & 0x7ff, data);
+ }
+ }
+
+ return data;
+}
+
+WRITE8_MEMBER( beta_state::riot_pa_w )
+{
+ /*
+
+ bit description
+
+ PA0 2716 D0, segment D, key bit 0
+ PA1 2716 D1, segment E, key bit 1
+ PA2 2716 D2, segment C, key bit 2
+ PA3 2716 D3, segment G, key bit 3
+ PA4 2716 D4, segment F, key bit 4
+ PA5 2716 D5, segment B
+ PA6 2716 D6, segment A
+ PA7 2716 D7
+
+ */
+
+// logerror("PA %02x\n", data);
+
+ /* display */
+ m_segment = BITSWAP8(data, 7, 3, 4, 1, 0, 2, 5, 6) & 0x7f;
+ m_led_refresh_timer->adjust(attotime::from_usec(70));
+
+ /* EPROM data */
+ m_eprom_data = data;
+}
+
+READ8_MEMBER( beta_state::riot_pb_r )
+{
+ return 0;
+}
+
+WRITE8_MEMBER( beta_state::riot_pb_w )
+{
+ /*
+
+ bit description
+
+ PB0 74LS145 P0
+ PB1 74LS145 P1
+ PB2 74LS145 P2
+ PB3 74LS145 P3, 74LS164 D
+ PB4 loudspeaker, data led
+ PB5 address led, 74LS164 CP
+ PB6 2716 _OE
+ PB7 2716 _CE
+
+ */
+
+ //logerror("PB %02x %02x\n", data, olddata);
+
+ /* display */
+ m_ls145_p = data & 0x0f;
+
+ /* speaker */
+ speaker_level_w(m_speaker, !BIT(data, 4));
+
+ /* address led */
+ output_set_led_value(0, BIT(data, 5));
+
+ /* data led */
+ output_set_led_value(1, !BIT(data, 5));
+
+ /* EPROM address shift */
+ if (!BIT(m_old_data, 5) && BIT(data, 5))
+ {
+ m_eprom_addr <<= 1;
+ m_eprom_addr |= BIT(m_old_data, 3);
+ }
+
+ /* EPROM output enable */
+ m_eprom_oe = BIT(data, 6);
+
+ /* EPROM chip enable */
+ m_eprom_ce = BIT(data, 7);
+
+ if (BIT(data, 6) && (!BIT(m_old_data, 7) && BIT(data, 7)))
+ {
+ popmessage("EPROM write %04x = %02x\n", m_eprom_addr & 0x7ff, m_eprom_data);
+ memregion(EPROM_TAG)->base()[m_eprom_addr & 0x7ff] &= m_eprom_data;
+ }
+
+ m_old_data = data;
+}
+
+static const riot6532_interface beta_riot_interface =
+{
+ DEVCB_DRIVER_MEMBER(beta_state, riot_pa_r),
+ DEVCB_DRIVER_MEMBER(beta_state, riot_pb_r),
+ DEVCB_DRIVER_MEMBER(beta_state, riot_pa_w),
+ DEVCB_DRIVER_MEMBER(beta_state, riot_pb_w),
+ DEVCB_CPU_INPUT_LINE(M6502_TAG, M6502_IRQ_LINE)
+};
+
+/* Quickload */
+
+static DEVICE_IMAGE_UNLOAD( beta_eprom )
+{
+ UINT8 *ptr = image.device().machine().root_device().memregion(EPROM_TAG)->base();
+
+ image.fwrite(ptr, 0x800);
+}
+
+/* Machine Initialization */
+
+void beta_state::machine_start()
+{
+ m_led_refresh_timer = machine().scheduler().timer_alloc(FUNC(led_refresh));
+
+ /* register for state saving */
+ save_item(NAME(m_eprom_oe));
+ save_item(NAME(m_eprom_ce));
+ save_item(NAME(m_eprom_addr));
+ save_item(NAME(m_eprom_data));
+ save_item(NAME(m_old_data));
+ save_item(NAME(m_ls145_p));
+ save_item(NAME(m_segment));
+}
+
+/* Machine Driver */
+
+static MACHINE_CONFIG_START( beta, beta_state )
+ /* basic machine hardware */
+ MCFG_CPU_ADD(M6502_TAG, M6502, XTAL_4MHz/4)
+ MCFG_CPU_PROGRAM_MAP(beta_mem)
+
+ /* video hardware */
+ MCFG_DEFAULT_LAYOUT( layout_beta )
+
+ /* sound hardware */
+ MCFG_SPEAKER_STANDARD_MONO("mono")
+ MCFG_SOUND_ADD(SPEAKER_TAG, SPEAKER_SOUND, 0)
+ MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)
+
+ /* devices */
+ MCFG_RIOT6532_ADD(M6532_TAG, XTAL_4MHz/4, beta_riot_interface)
+
+ /* EPROM socket */
+ MCFG_CARTSLOT_ADD(EPROM_TAG)
+ MCFG_CARTSLOT_EXTENSION_LIST("bin,rom")
+ MCFG_CARTSLOT_NOT_MANDATORY
+ MCFG_CARTSLOT_UNLOAD(beta_eprom)
+
+ /* internal ram */
+ MCFG_RAM_ADD(RAM_TAG)
+ MCFG_RAM_DEFAULT_SIZE("256")
+MACHINE_CONFIG_END
+
+/* ROMs */
+
+ROM_START( beta )
+ ROM_REGION( 0x10000, M6502_TAG, 0 )
+ ROM_LOAD( "beta.rom", 0x8000, 0x0800, CRC(d42fdb17) SHA1(595225a0cd43dd76c46b2aff6c0f27d5991cc4f0))
+
+ ROM_REGION( 0x800, EPROM_TAG, ROMREGION_ERASEFF )
+ ROM_CART_LOAD( EPROM_TAG, 0x0000, 0x0800, ROM_FULLSIZE )
+ROM_END
+
+/* System Drivers */
+
+/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */
+COMP( 1984, beta, 0, 0, beta, beta, driver_device, 0, "Pitronics", "Beta", GAME_SUPPORTS_SAVE )