diff options
Diffstat (limited to 'src/mame/drivers/beta.c')
-rw-r--r-- | src/mame/drivers/beta.c | 378 |
1 files changed, 378 insertions, 0 deletions
diff --git a/src/mame/drivers/beta.c b/src/mame/drivers/beta.c new file mode 100644 index 00000000000..c545a4622a8 --- /dev/null +++ b/src/mame/drivers/beta.c @@ -0,0 +1,378 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/*************************************************************************** + + 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: + + - verify whether feeding a 0xff-filled 2K binary file as cart allows + to write back correctly EPROM or not + +*/ + +#include "emu.h" +#include "cpu/m6502/m6502.h" +#include "machine/mos6530n.h" +#include "machine/ram.h" +#include "sound/speaker.h" + +#include "bus/generic/slot.h" +#include "bus/generic/carts.h" + +#include "beta.lh" + +#define SCREEN_TAG "screen" +#define M6502_TAG "m6502" +#define M6532_TAG "m6532" +#define EPROM_TAG "eprom" +//#define SPEAKER_TAG "b237" + +class beta_state : public driver_device +{ +public: + beta_state(const machine_config &mconfig, device_type type, const char *tag) + : driver_device(mconfig, type, tag), + m_maincpu(*this, M6502_TAG), + m_speaker(*this, "speaker"), + m_eprom(*this, EPROM_TAG), + m_q6(*this, "Q6"), + m_q7(*this, "Q7"), + m_q8(*this, "Q8"), + m_q9(*this, "Q9") + { } + + required_device<cpu_device> m_maincpu; + required_device<speaker_sound_device> m_speaker; + required_device<generic_slot_device> m_eprom; + required_ioport m_q6; + required_ioport m_q7; + required_ioport m_q8; + required_ioport m_q9; + + virtual void machine_start(); + + DECLARE_READ8_MEMBER( riot_pa_r ); + DECLARE_WRITE8_MEMBER( riot_pa_w ); + DECLARE_READ8_MEMBER( riot_pb_r ); + DECLARE_WRITE8_MEMBER( riot_pb_w ); + DECLARE_INPUT_CHANGED_MEMBER( trigger_reset ); + + DECLARE_DEVICE_IMAGE_LOAD_MEMBER( beta_eprom ); + DECLARE_DEVICE_IMAGE_UNLOAD_MEMBER( beta_eprom ); + + /* EPROM state */ + int m_eprom_oe; + int m_eprom_ce; + UINT16 m_eprom_addr; + UINT8 m_eprom_data; + UINT8 m_old_data; + dynamic_buffer m_eprom_rom; + + /* display state */ + UINT8 m_ls145_p; + UINT8 m_segment; + + emu_timer *m_led_refresh_timer; + TIMER_CALLBACK_MEMBER(led_refresh); +}; + + +/* Memory Maps */ + +static ADDRESS_MAP_START( beta_mem, AS_PROGRAM, 8, beta_state ) + AM_RANGE(0x0000, 0x007f) AM_MIRROR(0x7f00) AM_DEVICE(M6532_TAG, mos6532_t, ram_map) + AM_RANGE(0x0080, 0x00ff) AM_MIRROR(0x7f00) AM_DEVICE(M6532_TAG, mos6532_t, io_map) + 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 */ + +TIMER_CALLBACK_MEMBER(beta_state::led_refresh) +{ + if (m_ls145_p < 6) + { + output_set_digit_value(m_ls145_p, 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 &= m_q6->read(); break; + case 7: data &= m_q7->read(); break; + case 8: data &= m_q8->read(); break; + case 9: data &= m_q9->read(); break; + default: + if (!m_eprom_oe && !m_eprom_ce) + { + data = m_eprom_rom[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 */ + m_speaker->level_w(!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); + m_eprom_rom[m_eprom_addr & 0x7ff] &= m_eprom_data; + } + + m_old_data = data; +} + +/* EPROM socket */ + +DEVICE_IMAGE_LOAD_MEMBER( beta_state, beta_eprom ) +{ + UINT32 size = m_eprom->common_get_size("rom"); + + if (size != 0x800) + { + image.seterror(IMAGE_ERROR_UNSPECIFIED, "Unsupported cartridge size"); + return IMAGE_INIT_FAIL; + } + + m_eprom->rom_alloc(size, GENERIC_ROM8_WIDTH, ENDIANNESS_LITTLE); + m_eprom->common_load_rom(m_eprom->get_rom_base(), size, "rom"); + + return IMAGE_INIT_PASS; +} + +DEVICE_IMAGE_UNLOAD_MEMBER( beta_state, beta_eprom ) +{ + if (image.software_entry() == NULL) + image.fwrite(&m_eprom_rom[0], 0x800); +} + +/* Machine Initialization */ + +void beta_state::machine_start() +{ + m_led_refresh_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(beta_state::led_refresh),this)); + + m_eprom_rom.resize(0x800); + + if (!m_eprom->exists()) + memset(&m_eprom_rom[0], 0xff, 0x800); + else + { + std::string region_tag; + memcpy(&m_eprom_rom[0], memregion(region_tag.assign(m_eprom->tag()).append(GENERIC_ROM_REGION_TAG).c_str())->base(), 0x800); + } + + // 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_eprom_rom)); + 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", SPEAKER_SOUND, 0) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25) + + /* devices */ + MCFG_DEVICE_ADD(M6532_TAG, MOS6532n, XTAL_4MHz/4) + MCFG_MOS6530n_IN_PA_CB(READ8(beta_state, riot_pa_r)) + MCFG_MOS6530n_OUT_PA_CB(WRITE8(beta_state, riot_pa_w)) + MCFG_MOS6530n_IN_PB_CB(READ8(beta_state, riot_pb_r)) + MCFG_MOS6530n_OUT_PB_CB(WRITE8(beta_state, riot_pb_w)) + MCFG_MOS6530n_IRQ_CB(INPUTLINE(M6502_TAG, M6502_IRQ_LINE)) + + /* EPROM socket */ + MCFG_GENERIC_CARTSLOT_ADD(EPROM_TAG, generic_plain_slot, NULL) + MCFG_GENERIC_EXTENSIONS("bin,rom") + MCFG_GENERIC_LOAD(beta_state, beta_eprom) + MCFG_GENERIC_UNLOAD(beta_state, 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_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", MACHINE_SUPPORTS_SAVE ) |