diff options
Diffstat (limited to 'src/mess/drivers/vcs80.c')
-rw-r--r-- | src/mess/drivers/vcs80.c | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/src/mess/drivers/vcs80.c b/src/mess/drivers/vcs80.c new file mode 100644 index 00000000000..553f790f7e6 --- /dev/null +++ b/src/mess/drivers/vcs80.c @@ -0,0 +1,265 @@ +/*************************************************************************** + + VCS-80 + + 12/05/2009 Skeleton driver. + + http://hc-ddr.hucki.net/entwicklungssysteme.htm#VCS_80_von_Eckhard_Schiller + +This system is heavily based on the tk80. The display and keyboard matrix +are very similar, while the operation is easier in the vcs80. The hardware +is completely different however. + +Pasting: + 0-F : as is + A+ : ^ + A- : V + MA : - + GO : X + +When booted, the system begins at 0000 which is ROM. You need to change the +address to 0400 before entering a program. Here is a test to paste in: +0400-11^22^33^44^55^66^77^88^99^0400- +Press the up-arrow to confirm data has been entered. + +Operation: +4 digits at left is the address; 2 digits at right is the data. +As you increment addresses, the middle 2 digits show the previous byte. +You can enter 4 digits, and pressing 'MA' will transfer this info +to the left, thus setting the address to this value. Press 'A+' to +store new data and increment the address. + +****************************************************************************/ + +#include "includes/vcs80.h" +#include "vcs80.lh" + +/* Read/Write Handlers */ + +READ8_MEMBER( vcs80_state::pio_r ) +{ + switch (offset) + { + case 0: return m_pio->control_read(); + case 1: return m_pio->control_read(); + case 2: return m_pio->data_read(1); + case 3: return m_pio->data_read(0); + } + + return 0; +} + +WRITE8_MEMBER( vcs80_state::pio_w ) +{ + switch (offset) + { + case 0: m_pio->control_write(1, data); break; + case 1: m_pio->control_write(0, data); break; + case 2: m_pio->data_write(1, data); break; + case 3: m_pio->data_write(0, data); break; + } +} + +/* Memory Maps */ + +static ADDRESS_MAP_START( vcs80_mem, AS_PROGRAM, 8, vcs80_state ) + AM_RANGE(0x0000, 0x01ff) AM_ROM + AM_RANGE(0x0400, 0x07ff) AM_RAM +ADDRESS_MAP_END + +static ADDRESS_MAP_START( vcs80_io, AS_IO, 8, vcs80_state ) + ADDRESS_MAP_GLOBAL_MASK(0xff) + AM_RANGE(0x04, 0x07) AM_READWRITE(pio_r, pio_w) +ADDRESS_MAP_END + +/* Input Ports */ + +static INPUT_PORTS_START( vcs80 ) + PORT_START("ROW0") + 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_1) PORT_CHAR('1') + PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_2) PORT_CHAR('2') + PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_3) PORT_CHAR('3') + PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_4) PORT_CHAR('4') + PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_5) PORT_CHAR('5') + PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_6) PORT_CHAR('6') + PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_7) PORT_CHAR('7') + + PORT_START("ROW1") + PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_8) PORT_CHAR('8') + PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_9) PORT_CHAR('9') + PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_A) PORT_CHAR('A') + PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_B) PORT_CHAR('B') + PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_C) PORT_CHAR('C') + PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_D) PORT_CHAR('D') + PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_E) PORT_CHAR('E') + PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_F) PORT_CHAR('F') + + PORT_START("ROW2") + PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("A+") PORT_CODE(KEYCODE_UP) PORT_CHAR('^') + PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("A-") PORT_CODE(KEYCODE_DOWN) PORT_CHAR('V') + PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("MA") PORT_CODE(KEYCODE_M) PORT_CHAR('-') + PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("RE") PORT_CODE(KEYCODE_R) PORT_CHAR('R') + PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("GO") PORT_CODE(KEYCODE_G) PORT_CODE(KEYCODE_X) PORT_CHAR('X') + PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("TR") PORT_CODE(KEYCODE_T) + PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("ST") PORT_CODE(KEYCODE_S) + PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("PE") PORT_CODE(KEYCODE_P) +INPUT_PORTS_END + +/* Z80-PIO Interface */ + +static TIMER_DEVICE_CALLBACK( vcs80_keyboard_tick ) +{ + vcs80_state *state = timer.machine().driver_data<vcs80_state>(); + + if (state->m_keyclk) + { + state->m_keylatch++; + state->m_keylatch &= 7; + } + + state->m_pio->port_a_write(state->m_keyclk << 7); + + state->m_keyclk = !state->m_keyclk; +} + +READ8_MEMBER( vcs80_state::pio_pa_r ) +{ + /* + + bit description + + PA0 keyboard and led latch bit 0 + PA1 keyboard and led latch bit 1 + PA2 keyboard and led latch bit 2 + PA3 GND + PA4 keyboard row input 0 + PA5 keyboard row input 1 + PA6 keyboard row input 2 + PA7 demultiplexer clock input + + */ + + UINT8 data = 0; + + /* keyboard and led latch */ + data |= m_keylatch; + + /* keyboard rows */ + data |= BIT(ioport("ROW0")->read(), m_keylatch) << 4; + data |= BIT(ioport("ROW1")->read(), m_keylatch) << 5; + data |= BIT(ioport("ROW2")->read(), m_keylatch) << 6; + + /* demultiplexer clock */ + data |= (m_keyclk << 7); + + return data; +} + +WRITE8_MEMBER( vcs80_state::pio_pb_w ) +{ + /* + + bit description + + PB0 VQD30 segment A + PB1 VQD30 segment B + PB2 VQD30 segment C + PB3 VQD30 segment D + PB4 VQD30 segment E + PB5 VQD30 segment G + PB6 VQD30 segment F + PB7 _A0 + + */ + + UINT8 led_data = BITSWAP8(data & 0x7f, 7, 5, 6, 4, 3, 2, 1, 0); + int digit = m_keylatch; + + /* skip middle digit */ + if (digit > 3) digit++; + + output_set_digit_value(8 - digit, led_data); +} + +static Z80PIO_INTERFACE( pio_intf ) +{ + DEVCB_CPU_INPUT_LINE(Z80_TAG, INPUT_LINE_IRQ0), /* callback when change interrupt status */ + DEVCB_DRIVER_MEMBER(vcs80_state, pio_pa_r), /* port A read callback */ + DEVCB_NULL, /* port A write callback */ + DEVCB_NULL, /* portA ready active callback */ + DEVCB_NULL, /* port B read callback */ + DEVCB_DRIVER_MEMBER(vcs80_state, pio_pb_w), /* port B write callback */ + DEVCB_NULL /* portB ready active callback */ +}; + +/* Z80 Daisy Chain */ + +static const z80_daisy_config vcs80_daisy_chain[] = +{ + { Z80PIO_TAG }, + { NULL } +}; + +/* Machine Initialization */ + +void vcs80_state::machine_start() +{ + m_pio->strobe_a(1); + m_pio->strobe_b(1); + + /* register for state saving */ + save_item(NAME(m_keylatch)); + save_item(NAME(m_keyclk)); +} + +/* Machine Driver */ + +static MACHINE_CONFIG_START( vcs80, vcs80_state ) + /* basic machine hardware */ + MCFG_CPU_ADD(Z80_TAG, Z80, XTAL_5MHz/2) /* U880D */ + MCFG_CPU_PROGRAM_MAP(vcs80_mem) + MCFG_CPU_IO_MAP(vcs80_io) + MCFG_CPU_CONFIG(vcs80_daisy_chain) + + /* keyboard timer */ + MCFG_TIMER_ADD_PERIODIC("keyboard", vcs80_keyboard_tick, attotime::from_hz(1000)) + + /* video hardware */ + MCFG_DEFAULT_LAYOUT( layout_vcs80 ) + + /* devices */ + MCFG_Z80PIO_ADD(Z80PIO_TAG, XTAL_5MHz/2, pio_intf) + + /* internal ram */ + MCFG_RAM_ADD(RAM_TAG) + MCFG_RAM_DEFAULT_SIZE("1K") +MACHINE_CONFIG_END + +/* ROMs */ + +ROM_START( vcs80 ) + ROM_REGION( 0x10000, Z80_TAG, 0 ) + ROM_LOAD( "monitor.rom", 0x0000, 0x0200, CRC(44aff4e9) SHA1(3472e5a9357eaba3ed6de65dee2b1c6b29349dd2) ) +ROM_END + +/* Driver Initialization */ + +DIRECT_UPDATE_MEMBER(vcs80_state::vcs80_direct_update_handler) +{ + /* _A0 is connected to PIO PB7 */ + m_pio->port_b_write((!BIT(address, 0)) << 7); + + return address; +} + +DRIVER_INIT_MEMBER(vcs80_state,vcs80) +{ + machine().device(Z80_TAG)->memory().space(AS_PROGRAM)->set_direct_update_handler(direct_update_delegate(FUNC(vcs80_state::vcs80_direct_update_handler), this)); + machine().device(Z80_TAG)->memory().space(AS_IO)->set_direct_update_handler(direct_update_delegate(FUNC(vcs80_state::vcs80_direct_update_handler), this)); +} + +/* System Drivers */ + +/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */ +COMP( 1983, vcs80, 0, 0, vcs80, vcs80, vcs80_state, vcs80, "Eckhard Schiller", "VCS-80", GAME_SUPPORTS_SAVE | GAME_NO_SOUND) |