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-rw-r--r--src/mess/drivers/bigbord2.c621
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diff --git a/src/mess/drivers/bigbord2.c b/src/mess/drivers/bigbord2.c
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--- a/src/mess/drivers/bigbord2.c
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-// license:BSD-3-Clause
-// copyright-holders:Robbbert
-/***************************************************************************
-
- Big Board 2
-
- 12/05/2009 Skeleton driver.
-
- This is very much under construction.
-
- Despite the name, this is not like the xerox or bigboard at all.
-
- It is compatible only if the software uses the same published
- calls to the bios. Everything else is different.
-
-80 = sio ce
-84 = ctca ce
-88 = ctcb ce
-8c = dma ce
-c0 = prog
-c4 = status 7,6,5,4 = sw1-4; 3 = kbdstb; 2 = motor; 1 = rxdb; 0 = rxda
-c8 = sys1
-cc = sys2
-d0 = kbd
-d4 = 1793 ce
-d8 = port7
-dc = 6845 ce
-
-
-Difficulties encountered:
-
-CTCA controls a pair of vectored interrupts.
-One is triggered by a keypress, the other by a vsync pulse..
-Once a key is pressed, CTCA continually issues a keyboard interrupt,
-causing a complete freeze. Therefore CTCA has been isolated, and the
-2 interrupts are triggered by a hack. It isn't a very good hack,
-because the system crashes after a while. However it will allow
-testing and development to continue.
-
-The FDC has a INTRQ pin, the diagram says it goes to page 6, but
-it just vanishes instead.
-
-What works:
-
-Turn it on, wait for cursor to appear in the top corner. Press Enter.
-Now you can enter commands.
-
-Memory banking:
-
-0000-7FFF are controlled by bit 0 of port C8, and select ROM&video, or RAM
-8000-FFFF control if RAM is onboard, or on S100 bus (do not know what controls this)
-We do not emulate the S100, so therefore banks 1&2 are the same as 3&4.
-The switching from port C8 is emulated.
-
-ToDo:
-- Finish floppy disk support (i have no boot disk)
-- Finish the DMA switch in portcc_w.
-- Fix the above problems with the CTC.
-- Finish connecting up the SIO, when it becomes usable.
-- Connect up the SASI, Centronics and other interfaces on ports D8-DB.
-- Connect up the programming port C0-C3.
-- Connect up the numerous board jumpers.
-- Need software
-
-Monitor commands:
-B - boot from disk
-C - copy memory
-D - dump memory
-F - fill memory
-G - go
-I - in port
-M - modify memory
-O - out port
-R - read a sector
-T - test memory
-V - compare blocks of memory
-X - change banks
-
-****************************************************************************/
-
-
-
-#include "emu.h"
-#include "cpu/z80/z80.h"
-#include "cpu/z80/z80daisy.h"
-#include "machine/z80ctc.h"
-#include "machine/z80dart.h"
-#include "machine/z80dma.h"
-#include "video/mc6845.h"
-#include "machine/keyboard.h"
-#include "sound/beep.h"
-#include "machine/wd_fdc.h"
-
-#define SCREEN_TAG "screen"
-#define KEYBOARD_TAG "keyboard"
-#define Z80_TAG "u39"
-#define Z80SIO_TAG "u16"
-#define Z80CTCA_TAG "u37"
-#define Z80CTCB_TAG "u21"
-#define Z80DMA_TAG "u62"
-
-class bigbord2_state : public driver_device
-{
-public:
- bigbord2_state(const machine_config &mconfig, device_type type, const char *tag)
- : driver_device(mconfig, type, tag),
- m_maincpu(*this, Z80_TAG),
- m_6845(*this, "crtc"),
- m_ctca(*this, Z80CTCA_TAG),
- m_ctcb(*this, Z80CTCB_TAG),
- m_dma(*this, Z80DMA_TAG),
- m_fdc(*this, "fdc"),
- m_floppy0(*this, "fdc:0"),
- m_floppy1(*this, "fdc:1"),
- m_beeper(*this, "beeper"),
- m_dsw(*this, "DSW"),
- m_bankr(*this, "bankr"),
- m_bankv(*this, "bankv"),
- m_banka(*this, "banka"),
- m_palette(*this, "palette")
- {
- }
-
- DECLARE_WRITE8_MEMBER(portc8_w );
- DECLARE_WRITE8_MEMBER(portcc_w );
- DECLARE_READ8_MEMBER(portc4_r);
- DECLARE_READ8_MEMBER(portd0_r);
- DECLARE_WRITE8_MEMBER(bigbord2_kbd_put);
- DECLARE_WRITE_LINE_MEMBER(intrq_w);
- DECLARE_WRITE_LINE_MEMBER(drq_w);
- DECLARE_WRITE_LINE_MEMBER(frame);
- DECLARE_DRIVER_INIT(bigbord2);
- TIMER_DEVICE_CALLBACK_MEMBER(ctc_tick);
- DECLARE_READ8_MEMBER(memory_read_byte);
- DECLARE_WRITE8_MEMBER(memory_write_byte);
- DECLARE_READ8_MEMBER(io_read_byte);
- DECLARE_WRITE8_MEMBER(io_write_byte);
- MC6845_UPDATE_ROW(crtc_update_row);
- UINT8 *m_p_chargen; /* character ROM */
- UINT8 *m_p_videoram; /* Video RAM */
- UINT8 *m_p_attribram; /* Attribute RAM */
-private:
- UINT8 m_term_data;
- UINT8 m_term_status;
- int m_c8[8];
- floppy_image_device *m_floppy;
- virtual void machine_start();
- virtual void machine_reset();
- virtual void video_start();
- void fdc_intrq_w(bool state);
- void fdc_drq_w(bool state);
- address_space *m_mem;
- address_space *m_io;
- required_device<cpu_device> m_maincpu;
- required_device<mc6845_device> m_6845;
- required_device<z80ctc_device> m_ctca;
- required_device<z80ctc_device> m_ctcb;
- required_device<z80dma_device> m_dma;
- required_device<mb8877_t> m_fdc;
- required_device<floppy_connector> m_floppy0;
- required_device<floppy_connector> m_floppy1;
- required_device<beep_device> m_beeper;
- required_ioport m_dsw;
- required_memory_bank m_bankr;
- required_memory_bank m_bankv;
- required_memory_bank m_banka;
-public:
- required_device<palette_device> m_palette;
-};
-
-/* Status port
- 0 = RXDA
- 1 = RXDB
- 2 = MOTOR
- 3 = KBDSTB
- 4 = DIPSW 1
- 5 = DIPSW 2
- 6 = DIPSW 3
- 7 = DIPSW 4 */
-
-READ8_MEMBER( bigbord2_state::portc4_r )
-{
- UINT8 ret = m_term_status | 3 | (m_c8[6]<<2) | m_dsw->read();
- m_term_status = 0;
- return ret;
-}
-
-// KBD port - read ascii value of key pressed
-
-READ8_MEMBER( bigbord2_state::portd0_r )
-{
- UINT8 ret = m_term_data;
- m_term_data = 0;
- return ret;
-}
-
-WRITE8_MEMBER( bigbord2_state::bigbord2_kbd_put )
-{
- if (data)
- {
- m_term_data = data;
- m_term_status = 8;
- m_ctca->trg0(0);
- m_ctca->trg0(1);
- if (m_mem->read_byte(0xf13d) == 0x4d)
- {
- // simulate interrupt by saving current pc on
- // the stack and jumping to interrupt handler.
- UINT16 spreg = m_maincpu->state_int(Z80_SP);
- UINT16 pcreg = m_maincpu->state_int(Z80_PC);
- spreg--;
- m_mem->write_byte(spreg, pcreg >> 8);
- spreg--;
- m_mem->write_byte(spreg, pcreg);
- m_maincpu->set_state_int(Z80_SP, spreg);
- m_maincpu->set_state_int(Z80_PC, 0xF120);
- }
- }
-}
-
-/* Z80 DMA */
-
-
-READ8_MEMBER(bigbord2_state::memory_read_byte)
-{
- return m_mem->read_byte(offset);
-}
-
-WRITE8_MEMBER(bigbord2_state::memory_write_byte)
-{
- m_mem->write_byte(offset, data);
-}
-
-READ8_MEMBER(bigbord2_state::io_read_byte)
-{
- return m_io->read_byte(offset);
-}
-
-WRITE8_MEMBER(bigbord2_state::io_write_byte)
-{
- m_io->write_byte(offset, data);
-}
-
-
-/* Read/Write Handlers */
-
-
-WRITE8_MEMBER( bigbord2_state::portc8_w )
-{
- /*
-
- This port uses a 74LS259, which allows individual bits
- to be switched on and off, while the other bits are
- unaffected.
-
- bit signal description
-
- 0 D_S memory bank
- 1 SIDSEL side select
- 2 SMC1 u6 data separator pin 5
- 3 SMC2 u6 data separator pin 6
- 4 DDEN density
- 5 HLD head load
- 6 MOTOR disk motor
- 7 BELL beeper pulse
-
- */
-
- m_c8[data&7] = BIT(data, 3);
-
- switch (data&7)
- {
- case 0:
- // memory bank
- m_bankr->set_entry(m_c8[0]);
- m_bankv->set_entry(m_c8[0]);
- m_banka->set_entry(m_c8[0]);
- break;
- case 1:
- // side select
- if (m_floppy)
- {
- m_floppy->ss_w(m_c8[1]);
- }
-
- break;
-
- case 2:
- case 3:
- // these connect to "U6 (FDC9216B)" which drives the fdc "rawread" and "rclk" pins
- break;
- case 4:
- // density
- m_fdc->dden_w(m_c8[4]);
- break;
- case 5:
- // connects to HLD pin on floppy drive
- break;
- case 6:
- // motor on
- if (m_floppy)
- {
- m_floppy->mon_w(~m_c8[6]);
- }
- break;
- case 7:
- // beeper
- m_beeper->set_state(m_c8[7]);
- break;
- }
-}
-
-WRITE8_MEMBER( bigbord2_state::portcc_w )
-{
- /*
-
- bit signal description
-
- 0,1,2 operates a 74LS151 for 8 individual inputs to DMA RDY
- 0 W/RDYA channel A of SIO
- 1 W/RDYB channel B of SIO
- 2 DRQ DRQ on fdc
- 3 JB7 pin 1
- 4 JB7 pin 2
- 5 JB7 pin 3
- 6 JB7 pin 4
- 7 JB7 pin 5
- 3 /TEST test pin on FDC
- 4 DS3 drive 3 select
- 5 DS2 drive 2 select
- 6 DS1 drive 1 select
- 7 DS0 drive 0 select
-
- */
-
- /* drive select */
- m_floppy = NULL;
- if BIT(data, 7) m_floppy = m_floppy0->get_device();
- if BIT(data, 6) m_floppy = m_floppy1->get_device();
- //if BIT(data, 5) m_floppy = m_floppy2->get_device();
- //if BIT(data, 4) m_floppy = m_floppy3->get_device();
-
- m_fdc->set_floppy(m_floppy);
-
- bool dma_rdy = 0;
- if ((data & 7) == 2)
- dma_rdy = m_fdc->drq_r();
-
- m_dma->rdy_w(dma_rdy);
-}
-
-
-
-/* Memory Maps */
-
-static ADDRESS_MAP_START( bigbord2_mem, AS_PROGRAM, 8, bigbord2_state )
- ADDRESS_MAP_UNMAP_HIGH
- AM_RANGE(0x0000, 0x0fff) AM_RAMBANK("bankr")
- AM_RANGE(0x1000, 0x5fff) AM_RAM
- AM_RANGE(0x6000, 0x6fff) AM_RAMBANK("bankv")
- AM_RANGE(0x7000, 0x7fff) AM_RAMBANK("banka")
- AM_RANGE(0x8000, 0xffff) AM_RAM
-ADDRESS_MAP_END
-
-static ADDRESS_MAP_START( bigbord2_io, AS_IO, 8, bigbord2_state )
- ADDRESS_MAP_GLOBAL_MASK(0xff)
- AM_RANGE(0x80, 0x83) AM_DEVREADWRITE(Z80SIO_TAG, z80sio0_device, ba_cd_r, ba_cd_w)
- //AM_RANGE(0x84, 0x87) AM_DEVREADWRITE(Z80CTCA_TAG, z80ctc_device, read, write) //has issues
- AM_RANGE(0x88, 0x8b) AM_DEVREADWRITE(Z80CTCB_TAG, z80ctc_device, read, write)
- AM_RANGE(0x8C, 0x8F) AM_DEVREADWRITE(Z80DMA_TAG, z80dma_device, read, write)
- //AM_RANGE(0xC0, 0xC3) eprom programming port
- AM_RANGE(0xC4, 0xC7) AM_READ(portc4_r)
- AM_RANGE(0xC8, 0xCB) AM_WRITE(portc8_w)
- AM_RANGE(0xCC, 0xCF) AM_WRITE(portcc_w)
- AM_RANGE(0xD0, 0xD3) AM_READ(portd0_r)
- AM_RANGE(0xD4, 0xD7) AM_DEVREADWRITE("fdc", mb8877_t, read, write)
- //AM_RANGE(0xD8, 0xDB) AM_READWRITE(portd8_r, portd8_w) // various external data ports; DB = centronics printer
- AM_RANGE(0xDC, 0xDC) AM_MIRROR(2) AM_DEVREADWRITE("crtc", mc6845_device, status_r, address_w)
- AM_RANGE(0xDD, 0xDD) AM_MIRROR(2) AM_DEVREADWRITE("crtc", mc6845_device, register_r, register_w)
-ADDRESS_MAP_END
-
-
-/* Input Ports */
-
-static INPUT_PORTS_START( bigbord2 )
- PORT_START("DSW")
- PORT_BIT( 0xf, 0, IPT_UNUSED )
- PORT_DIPNAME( 0x10, 0x10, "Switch 4") PORT_DIPLOCATION("SW1:1")
- PORT_DIPSETTING( 0x10, DEF_STR(Off))
- PORT_DIPSETTING( 0x00, DEF_STR(On))
- PORT_DIPNAME( 0x20, 0x00, "Switch 3") PORT_DIPLOCATION("SW1:2")
- PORT_DIPSETTING( 0x20, DEF_STR(Off))
- PORT_DIPSETTING( 0x00, DEF_STR(On))
- PORT_DIPNAME( 0x40, 0x00, "Switch 2") PORT_DIPLOCATION("SW1:3")
- PORT_DIPSETTING( 0x40, DEF_STR(Off))
- PORT_DIPSETTING( 0x00, DEF_STR(On))
- PORT_DIPNAME( 0x80, 0x00, "Switch 1") PORT_DIPLOCATION("SW1:4")
- PORT_DIPSETTING( 0x80, DEF_STR(Off))
- PORT_DIPSETTING( 0x00, DEF_STR(On))
-INPUT_PORTS_END
-
-
-/* Z80 CTC */
-
-TIMER_DEVICE_CALLBACK_MEMBER(bigbord2_state::ctc_tick)
-{
- m_ctcb->trg0(1);
- m_ctcb->trg1(1);
- m_ctcb->trg0(0);
- m_ctcb->trg1(0);
-}
-
-WRITE_LINE_MEMBER( bigbord2_state::frame )
-{
- static UINT8 framecnt;
- framecnt++;
-
- if ((m_mem->read_byte(0xf13d) == 0x4d) & (framecnt > 3))
- {
- framecnt = 0;
- // simulate interrupt by saving current pc on
- // the stack and jumping to interrupt handler.
- UINT16 spreg = m_maincpu->state_int(Z80_SP);
- UINT16 pcreg = m_maincpu->state_int(Z80_PC);
- spreg--;
- m_mem->write_byte(spreg, pcreg >> 8);
- spreg--;
- m_mem->write_byte(spreg, pcreg);
- m_maincpu->set_state_int(Z80_SP, spreg);
- m_maincpu->set_state_int(Z80_PC, 0xF18E);
- }
-}
-
-
-/* Z80 Daisy Chain */
-
-static const z80_daisy_config bigbord2_daisy_chain[] =
-{
- { Z80DMA_TAG },
- { Z80CTCA_TAG },
- { Z80CTCB_TAG },
- { Z80SIO_TAG },
- { NULL }
-};
-
-/* WD1793 Interface */
-
-static SLOT_INTERFACE_START( bigbord2_floppies )
- SLOT_INTERFACE( "525dd", FLOPPY_525_DD )
-SLOT_INTERFACE_END
-
-
-/* Video */
-
-void bigbord2_state::video_start()
-{
- /* find memory regions */
- m_p_chargen = memregion("chargen")->base();
- m_p_videoram = memregion(Z80_TAG)->base()+0x6000;
- m_p_attribram = memregion(Z80_TAG)->base()+0x7000;
-}
-
-
-/* Machine Initialization */
-
-void bigbord2_state::machine_start()
-{
- /* register for state saving */
- save_item(NAME(m_term_data));
-}
-
-void bigbord2_state::machine_reset()
-{
- UINT8 i;
- for (i = 0; i < 8; i++)
- m_c8[i] = 0;
- m_beeper->set_state(0);
- m_beeper->set_frequency(950); // actual frequency is unknown
- m_bankr->set_entry(0);
- m_bankv->set_entry(0);
- m_banka->set_entry(0);
-}
-
-DRIVER_INIT_MEMBER(bigbord2_state,bigbord2)
-{
- m_mem = &m_maincpu->space(AS_PROGRAM);
- m_io = &m_maincpu->space(AS_IO);
- UINT8 *RAM = memregion(Z80_TAG)->base();
- m_bankr->configure_entries(0, 2, &RAM[0x0000], 0x10000);
- m_bankv->configure_entries(0, 2, &RAM[0x6000], 0x10000);
- m_banka->configure_entries(0, 2, &RAM[0x7000], 0x10000);
-}
-
-
-/* Screen */
-
-/* F4 Character Displayer */
-static const gfx_layout bigbord2_charlayout =
-{
- 8, 16, /* 8 x 8 characters */
- 256, /* 256 characters */
- 1, /* 1 bits per pixel */
- { 0 }, /* no bitplanes */
- /* x offsets */
- { 0, 1, 2, 3, 4, 5, 6, 7 },
- /* y offsets */
- { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
- 8*16 /* every char takes 8 bytes */
-};
-
-static GFXDECODE_START( bigbord2 )
- GFXDECODE_ENTRY( "chargen", 0x0000, bigbord2_charlayout, 0, 1 )
-GFXDECODE_END
-
-MC6845_UPDATE_ROW( bigbord2_state::crtc_update_row )
-{
- const rgb_t *palette = m_palette->palette()->entry_list_raw();
- UINT8 chr,gfx,inv;
- UINT16 mem,x;
- UINT32 *p = &bitmap.pix32(y);
-
- for (x = 0; x < x_count; x++)
- {
- inv=0;
- mem = (ma + x) & 0x7ff;
- if (BIT(m_p_attribram[mem], 7)) inv^=0xff;
- chr = m_p_videoram[mem];
-
- /* get pattern of pixels for that character scanline */
- gfx = m_p_chargen[(chr<<4) | ra ] ^ inv;
-
- /* Display a scanline of a character */
- *p++ = palette[BIT( gfx, 7 )];
- *p++ = palette[BIT( gfx, 6 )];
- *p++ = palette[BIT( gfx, 5 )];
- *p++ = palette[BIT( gfx, 4 )];
- *p++ = palette[BIT( gfx, 3 )];
- *p++ = palette[BIT( gfx, 2 )];
- *p++ = palette[BIT( gfx, 1 )];
- *p++ = palette[BIT( gfx, 0 )];
- }
-}
-
-/* Machine Drivers */
-
-#define MAIN_CLOCK XTAL_8MHz / 2
-
-static MACHINE_CONFIG_START( bigbord2, bigbord2_state )
- /* basic machine hardware */
- MCFG_CPU_ADD(Z80_TAG, Z80, MAIN_CLOCK)
- MCFG_CPU_PROGRAM_MAP(bigbord2_mem)
- MCFG_CPU_IO_MAP(bigbord2_io)
- MCFG_CPU_CONFIG(bigbord2_daisy_chain)
-
- /* video hardware */
- MCFG_SCREEN_ADD(SCREEN_TAG, RASTER)
- MCFG_SCREEN_RAW_PARAMS(XTAL_10_69425MHz, 700, 0, 560, 260, 0, 240)
- MCFG_SCREEN_UPDATE_DEVICE("crtc", mc6845_device, screen_update)
- MCFG_GFXDECODE_ADD("gfxdecode", "palette", bigbord2)
- MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette")
-
- /* keyboard */
- MCFG_TIMER_DRIVER_ADD_PERIODIC("ctc", bigbord2_state, ctc_tick, attotime::from_hz(MAIN_CLOCK))
-
- /* devices */
- MCFG_DEVICE_ADD(Z80DMA_TAG, Z80DMA, MAIN_CLOCK)
- MCFG_Z80DMA_OUT_BUSREQ_CB(INPUTLINE(Z80_TAG, INPUT_LINE_HALT))
- MCFG_Z80DMA_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
- MCFG_Z80DMA_IN_MREQ_CB(READ8(bigbord2_state, memory_read_byte))
- MCFG_Z80DMA_OUT_MREQ_CB(WRITE8(bigbord2_state, memory_write_byte))
- MCFG_Z80DMA_IN_IORQ_CB(READ8(bigbord2_state, io_read_byte))
- MCFG_Z80DMA_OUT_IORQ_CB(WRITE8(bigbord2_state, io_write_byte))
-
- MCFG_Z80SIO0_ADD(Z80SIO_TAG, MAIN_CLOCK, 0, 0, 0, 0)
- MCFG_Z80DART_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
-
- MCFG_DEVICE_ADD(Z80CTCA_TAG, Z80CTC, MAIN_CLOCK)
- MCFG_Z80CTC_INTR_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
- // other inputs of ctca:
- // trg0 = KBDSTB; trg1 = index pulse from fdc; trg2 = synca output from sio
-
- MCFG_DEVICE_ADD(Z80CTCB_TAG, Z80CTC, MAIN_CLOCK / 6)
- MCFG_Z80CTC_INTR_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
- // ZC0 = SIO channel B clock, ZC1 = SIO channel A clock
- MCFG_Z80CTC_ZC2_CB(DEVWRITELINE(Z80CTCB_TAG, z80ctc_device, trg3))
-
- MCFG_MB8877_ADD("fdc", XTAL_16MHz / 16)
- MCFG_FLOPPY_DRIVE_ADD("fdc:0", bigbord2_floppies, "525dd", floppy_image_device::default_floppy_formats)
- MCFG_FLOPPY_DRIVE_ADD("fdc:1", bigbord2_floppies, "525dd", floppy_image_device::default_floppy_formats)
-
- MCFG_MC6845_ADD("crtc", MC6845, SCREEN_TAG, XTAL_16MHz / 8)
- MCFG_MC6845_SHOW_BORDER_AREA(false)
- MCFG_MC6845_CHAR_WIDTH(8)
- MCFG_MC6845_UPDATE_ROW_CB(bigbord2_state, crtc_update_row)
- MCFG_MC6845_OUT_VSYNC_CB(WRITELINE(bigbord2_state, frame))
-
- MCFG_DEVICE_ADD(KEYBOARD_TAG, GENERIC_KEYBOARD, 0)
- MCFG_GENERIC_KEYBOARD_CB(WRITE8(bigbord2_state, bigbord2_kbd_put))
-
- /* sound hardware */
- MCFG_SPEAKER_STANDARD_MONO("mono")
- MCFG_SOUND_ADD("beeper", BEEP, 0)
- MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00)
-MACHINE_CONFIG_END
-
-
-/* ROMs */
-
-
-ROM_START( bigbord2 )
- ROM_REGION( 0x18000, Z80_TAG, 0 )
- ROM_LOAD( "bigbrdii.bin", 0x0000, 0x1000, CRC(c588189e) SHA1(4133903171ee8b9fcf12cc72de843af782b4a645) )
-
- // internal to 8002 chip (undumped) we will use one from 'vta2000' for now
- ROM_REGION( 0x2000, "chargen", ROMREGION_INVERT )
- ROM_LOAD( "bdp-15_14.rom", 0x0000, 0x2000, BAD_DUMP CRC(a1dc4f8e) SHA1(873fd211f44713b713d73163de2d8b5db83d2143) )
-ROM_END
-/* System Drivers */
-
-/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */
-COMP( 1982, bigbord2, bigboard, 0, bigbord2, bigbord2, bigbord2_state, bigbord2, "Digital Research Computers", "Big Board II", MACHINE_NOT_WORKING )