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Diffstat (limited to 'src/mame/drivers/xerox820.cpp')
-rw-r--r--src/mame/drivers/xerox820.cpp833
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diff --git a/src/mame/drivers/xerox820.cpp b/src/mame/drivers/xerox820.cpp
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index 00000000000..172d1d2cd3a
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+++ b/src/mame/drivers/xerox820.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/***************************************************************************
+
+ Xerox 820
+
+ 12/05/2009 Skeleton driver.
+
+****************************************************************************/
+
+/*
+
+ TODO:
+
+ - Xerox 820
+ - floppy format has 3xcd at the end of track data
+ :u109: write track 0
+ :u109: track description 16xff ... 109xff 3xcd
+ - Xerox 820-II
+ - floppy (read/write to FDC triggers Z80 WAIT)
+ - Winchester
+ - Shugart SA1004 (chs=256,4,40 ss=256)
+ - Shugart SA606 (chs=160,6, ss=256)
+ - Shugart SA1403D controller
+ - Xerox 16/8
+ - Emerald Microware X120 board
+ - type in Monitor v1.0 from manual
+ - ASCII keyboard
+ - low-profile keyboard
+
+ http://users.telenet.be/lust/Xerox820/index.htm
+ http://www.classiccmp.org/dunfield/img41867/system.htm
+ http://www.microcodeconsulting.com/z80/plus2.htm
+
+ Note:
+ - MK-82 have same roms as original Big Board
+ - MK-83 have 256K of RAM
+
+ 8-inch formats
+ 77 tracks, 1 head, 26 sectors, 128 bytes sector length, first sector id 1
+ 77 tracks, 1 head, 26 sectors, 256 bytes sector length, first sector id 1
+
+ 5.25-inch formats
+ 40 tracks, 1 head, 18 sectors, 128 bytes sector length, first sector id 1
+ 40 tracks, 2 heads, 18 sectors, 128 bytes sector length, first sector id 1
+
+*/
+
+
+#include "includes/xerox820.h"
+#include "softlist.h"
+/* Read/Write Handlers */
+
+void xerox820_state::bankswitch(int bank)
+{
+ address_space &program = m_maincpu->space(AS_PROGRAM);
+ UINT8 *ram = m_ram->pointer();
+
+ if (bank)
+ {
+ /* ROM */
+ program.install_rom(0x0000, 0x0fff, m_rom->base());
+ program.unmap_readwrite(0x1000, 0x1fff);
+ program.install_ram(0x3000, 0x3fff, m_video_ram);
+ }
+ else
+ {
+ /* RAM */
+ program.install_ram(0x0000, 0x3fff, ram);
+ }
+}
+
+void xerox820ii_state::bankswitch(int bank)
+{
+ address_space &program = m_maincpu->space(AS_PROGRAM);
+ UINT8 *ram = m_ram->pointer();
+
+ if (bank)
+ {
+ /* ROM */
+ program.install_rom(0x0000, 0x1fff, m_rom->base());
+ program.unmap_readwrite(0x2000, 0x2fff);
+ program.install_ram(0x3000, 0x3fff, m_video_ram);
+ program.unmap_readwrite(0x4000, 0xbfff);
+ }
+ else
+ {
+ /* RAM */
+ program.install_ram(0x0000, 0xbfff, ram);
+ }
+}
+
+READ8_MEMBER( xerox820_state::fdc_r )
+{
+ return m_fdc->gen_r(offset) ^ 0xff;
+}
+
+WRITE8_MEMBER( xerox820_state::fdc_w )
+{
+ m_fdc->gen_w(offset, data ^ 0xff);
+}
+
+WRITE8_MEMBER( xerox820_state::scroll_w )
+{
+ m_scroll = (offset >> 8) & 0x1f;
+}
+
+#ifdef UNUSED_CODE
+WRITE8_MEMBER( xerox820_state::x120_system_w )
+{
+ /*
+
+ bit signal description
+
+ 0 DSEL0 drive select bit 0 (01=A, 10=B, 00=C, 11=D)
+ 1 DSEL1 drive select bit 1
+ 2 SIDE side select
+ 3 VATT video attribute (0=inverse, 1=blinking)
+ 4 BELL bell trigger
+ 5 DENSITY density (0=double, 1=single)
+ 6 _MOTOR disk motor (0=on, 1=off)
+ 7 BANK memory bank switch (0=RAM, 1=ROM/video)
+
+ */
+}
+#endif
+
+WRITE8_MEMBER( xerox820ii_state::bell_w )
+{
+ m_speaker->level_w(offset);
+}
+
+WRITE8_MEMBER( xerox820ii_state::slden_w )
+{
+ m_fdc->dden_w(offset);
+}
+
+WRITE8_MEMBER( xerox820ii_state::chrom_w )
+{
+ m_chrom = offset;
+}
+
+WRITE8_MEMBER( xerox820ii_state::lowlite_w )
+{
+ m_lowlite = data;
+}
+
+WRITE8_MEMBER( xerox820ii_state::sync_w )
+{
+ if (offset)
+ {
+ /* set external clocks for synchronous sio A */
+ }
+ else
+ {
+ /* set internal clocks for asynchronous sio A */
+ }
+}
+
+/* Memory Maps */
+
+static ADDRESS_MAP_START( xerox820_mem, AS_PROGRAM, 8, xerox820_state )
+ ADDRESS_MAP_UNMAP_HIGH
+ AM_RANGE(0x3000, 0x3fff) AM_RAM AM_SHARE("video_ram")
+ AM_RANGE(0x4000, 0xffff) AM_RAM
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START( xerox820_io, AS_IO, 8, xerox820_state )
+ AM_RANGE(0x00, 0x00) AM_MIRROR(0xff03) AM_DEVWRITE(COM8116_TAG, com8116_device, str_w)
+ AM_RANGE(0x04, 0x07) AM_MIRROR(0xff00) AM_DEVREADWRITE(Z80SIO_TAG, z80sio0_device, ba_cd_r, ba_cd_w)
+ AM_RANGE(0x08, 0x0b) AM_MIRROR(0xff00) AM_DEVREADWRITE(Z80PIO_GP_TAG, z80pio_device, read_alt, write_alt)
+ AM_RANGE(0x0c, 0x0c) AM_MIRROR(0xff03) AM_DEVWRITE(COM8116_TAG, com8116_device, stt_w)
+ AM_RANGE(0x10, 0x13) AM_MIRROR(0xff00) AM_READWRITE(fdc_r, fdc_w)
+ AM_RANGE(0x14, 0x14) AM_MIRROR(0xff03) AM_MASK(0xff00) AM_WRITE(scroll_w)
+ AM_RANGE(0x18, 0x1b) AM_MIRROR(0xff00) AM_DEVREADWRITE(Z80CTC_TAG, z80ctc_device, read, write)
+ AM_RANGE(0x1c, 0x1f) AM_MIRROR(0xff00) AM_DEVREADWRITE(Z80PIO_KB_TAG, z80pio_device, read_alt, write_alt)
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START( xerox820ii_mem, AS_PROGRAM, 8, xerox820ii_state )
+ ADDRESS_MAP_UNMAP_HIGH
+ AM_RANGE(0x3000, 0x3fff) AM_RAM AM_SHARE("video_ram")
+ AM_RANGE(0xc000, 0xffff) AM_RAM
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START( xerox820ii_io, AS_IO, 8, xerox820ii_state )
+ AM_IMPORT_FROM(xerox820_io)
+ AM_RANGE(0x28, 0x29) AM_MIRROR(0xff00) AM_WRITE(bell_w)
+ AM_RANGE(0x30, 0x31) AM_MIRROR(0xff00) AM_WRITE(slden_w)
+ AM_RANGE(0x34, 0x35) AM_MIRROR(0xff00) AM_WRITE(chrom_w)
+ AM_RANGE(0x36, 0x36) AM_MIRROR(0xff00) AM_WRITE(lowlite_w)
+ AM_RANGE(0x68, 0x69) AM_MIRROR(0xff00) AM_WRITE(sync_w)
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START( xerox168_mem, AS_PROGRAM, 16, xerox820ii_state )
+ AM_RANGE(0x00000, 0x3ffff) AM_RAM
+ AM_RANGE(0xff000, 0xfffff) AM_ROM AM_REGION(I8086_TAG, 0)
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START( mk83_mem, AS_PROGRAM, 8, xerox820_state )
+ ADDRESS_MAP_UNMAP_HIGH
+ AM_RANGE(0x3000, 0x6fff) AM_RAM
+ AM_RANGE(0x7000, 0x7fff) AM_RAM AM_SHARE("video_ram")
+ AM_RANGE(0x8000, 0xffff) AM_RAM
+ADDRESS_MAP_END
+
+
+/* Input Ports */
+
+static INPUT_PORTS_START( xerox820 )
+ // inputs defined in machine/keyboard.c
+INPUT_PORTS_END
+
+TIMER_CALLBACK_MEMBER( bigboard_state::bigboard_beepoff )
+{
+ m_beeper->set_state(0);
+}
+
+/* Z80 PIO */
+
+READ8_MEMBER( xerox820_state::kbpio_pa_r )
+{
+ /*
+
+ bit signal description
+
+ 0
+ 1
+ 2
+ 3 PBRDY keyboard data available
+ 4 8/N5 8"/5.25" disk select (0=5.25", 1=8")
+ 5 400/460 double sided disk detect (only on Etch 2 PCB) (0=SS, 1=DS)
+ 6
+ 7
+
+ */
+
+ UINT8 data = 0;
+
+ // keyboard
+ data |= m_kbpio->rdy_b() << 3;
+
+ // floppy
+ data |= m_8n5 << 4;
+ data |= m_400_460 << 5;
+
+ return data;
+}
+
+WRITE8_MEMBER( xerox820_state::kbpio_pa_w )
+{
+ /*
+
+ bit signal description
+
+ 0 _DVSEL1 drive select 1
+ 1 _DVSEL2 drive select 2
+ 2 SIDE side select
+ 3
+ 4
+ 5
+ 6 NCSET2 display character set (inverted and connected to chargen A10)
+ 7 BANK bank switching (0=RAM, 1=ROM/videoram)
+
+ */
+
+ /* drive select */
+ floppy_image_device *floppy = NULL;
+
+ if (BIT(data, 0)) floppy = m_floppy0->get_device();
+ if (BIT(data, 1)) floppy = m_floppy1->get_device();
+
+ m_fdc->set_floppy(floppy);
+
+ if (floppy)
+ {
+ int _8n5 = (floppy->get_form_factor() == floppy_image::FF_8);
+
+ if (m_8n5 != _8n5)
+ {
+ m_8n5 = _8n5;
+
+ m_fdc->set_unscaled_clock(m_8n5 ? XTAL_20MHz/10 : XTAL_20MHz/20);
+ }
+
+ m_400_460 = !floppy->twosid_r();
+
+ floppy->mon_w(0);
+
+ floppy->ss_w(BIT(data, 2));
+ }
+
+ /* display character set */
+ m_ncset2 = !BIT(data, 6);
+
+ /* bank switching */
+ bankswitch(BIT(data, 7));
+}
+
+WRITE8_MEMBER( bigboard_state::kbpio_pa_w )
+{
+ xerox820_state::kbpio_pa_w(space, offset, data);
+
+ /* beeper on bigboard */
+ if (BIT(data, 5) & (!m_bit5))
+ {
+ machine().scheduler().timer_set(attotime::from_msec(40), timer_expired_delegate(FUNC(bigboard_state::bigboard_beepoff),this));
+ m_beeper->set_state(1);
+ }
+ m_bit5 = BIT(data, 5);
+}
+
+READ8_MEMBER( xerox820_state::kbpio_pb_r )
+{
+ /*
+
+ bit description
+
+ 0 KB0
+ 1 KB1
+ 2 KB2
+ 3 KB3
+ 4 KB4
+ 5 KB5
+ 6 KB6
+ 7 KB7
+
+ */
+
+ return m_kb->read() ^ 0xff;
+}
+
+WRITE8_MEMBER( xerox820ii_state::rdpio_pb_w )
+{
+ /*
+
+ bit description
+
+ 0 NBSY
+ 1 NMSG
+ 2 NC/D
+ 3 NREQ
+ 4 NI/O
+ 5 NSEL
+ 6 LS74 Q
+ 7 NRST
+ */
+
+ m_sasibus->write_sel(!BIT(data, 5));
+ m_sasibus->write_rst(!BIT(data, 7));
+ // TODO: LS74 Q
+}
+
+WRITE_LINE_MEMBER( xerox820ii_state::rdpio_pardy_w )
+{
+ // TODO
+}
+
+/* Z80 CTC */
+
+TIMER_DEVICE_CALLBACK_MEMBER( xerox820_state::ctc_tick )
+{
+ m_ctc->trg0(1);
+ m_ctc->trg0(0);
+}
+
+/* Z80 Daisy Chain */
+
+static const z80_daisy_config xerox820_daisy_chain[] =
+{
+ { Z80SIO_TAG },
+ { Z80PIO_KB_TAG },
+ { Z80PIO_GP_TAG },
+ { Z80CTC_TAG },
+ { NULL }
+};
+
+/* WD1771 Interface */
+
+static SLOT_INTERFACE_START( xerox820_floppies )
+ SLOT_INTERFACE( "sa400", FLOPPY_525_SSSD_35T ) // Shugart SA-400
+ SLOT_INTERFACE( "sa450", FLOPPY_525_DD ) // Shugart SA-450
+ SLOT_INTERFACE( "sa800", FLOPPY_8_SSDD ) // Shugart SA-800
+ SLOT_INTERFACE( "sa850", FLOPPY_8_DSDD ) // Shugart SA-850
+SLOT_INTERFACE_END
+
+void xerox820_state::update_nmi()
+{
+ int halt = m_maincpu->state_int(Z80_HALT);
+ int state = (halt && (m_fdc_irq || m_fdc_drq)) ? ASSERT_LINE : CLEAR_LINE;
+
+ m_maincpu->set_input_line(INPUT_LINE_NMI, state);
+}
+
+WRITE_LINE_MEMBER( xerox820_state::fdc_intrq_w )
+{
+ m_fdc_irq = state;
+
+ update_nmi();
+}
+
+WRITE_LINE_MEMBER( xerox820_state::fdc_drq_w )
+{
+ m_fdc_drq = state;
+
+ update_nmi();
+}
+
+/* COM8116 Interface */
+
+WRITE_LINE_MEMBER( xerox820_state::fr_w )
+{
+ m_sio->rxca_w(state);
+ m_sio->txca_w(state);
+}
+
+/* Video */
+
+UINT32 xerox820_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
+{
+ UINT8 y,ra,chr,gfx;
+ UINT16 sy=0,ma=(m_scroll + 1) * 0x80,x;
+ const pen_t *pen=m_palette->pens();
+
+ m_framecnt++;
+
+ for (y = 0; y < 24; y++)
+ {
+ if (ma > 0xb80) ma = 0;
+
+ for (ra = 0; ra < 10; ra++)
+ {
+ UINT32 *p = &bitmap.pix32(sy++);
+
+ for (x = ma; x < ma + 80; x++)
+ {
+ if (ra < 8)
+ {
+ chr = m_video_ram[x & XEROX820_VIDEORAM_MASK] ^ 0x80;
+
+ /* Take care of flashing characters */
+ if ((chr < 0x80) && (m_framecnt & 0x08))
+ chr |= 0x80;
+
+ /* get pattern of pixels for that character scanline */
+ gfx = m_char_rom->base()[(m_ncset2 << 10) | (chr<<3) | ra ];
+ }
+ else
+ gfx = 0xff;
+
+ /* Display a scanline of a character (7 pixels) */
+ *p++ = pen[0];
+ *p++ = pen[BIT(gfx, 4) ^ 1];
+ *p++ = pen[BIT(gfx, 3) ^ 1];
+ *p++ = pen[BIT(gfx, 2) ^ 1];
+ *p++ = pen[BIT(gfx, 1) ^ 1];
+ *p++ = pen[BIT(gfx, 0) ^ 1];
+ *p++ = pen[0];
+ }
+ }
+ ma+=128;
+ }
+ return 0;
+}
+
+/* Machine Initialization */
+
+void xerox820_state::machine_start()
+{
+ // state saving
+ save_item(NAME(m_scroll));
+ save_item(NAME(m_ncset2));
+ save_item(NAME(m_vatt));
+ save_item(NAME(m_fdc_irq));
+ save_item(NAME(m_fdc_drq));
+ save_item(NAME(m_8n5));
+ save_item(NAME(m_400_460));
+}
+
+void xerox820_state::machine_reset()
+{
+ bankswitch(1);
+
+ m_fdc->reset();
+}
+
+void bigboard_state::machine_reset()
+{
+ bankswitch(1);
+
+ /* bigboard has a one-pulse output to drive a user-supplied beeper */
+ m_beeper->set_state(0);
+ m_beeper->set_frequency(950);
+
+ m_fdc->reset();
+}
+
+void xerox820ii_state::machine_reset()
+{
+ bankswitch(1);
+
+ m_fdc->reset();
+}
+
+
+/* F4 Character Displayer */
+static const gfx_layout xerox820_charlayout =
+{
+ 8, 8, /* 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*8 /* every char takes 8 bytes */
+};
+
+static const gfx_layout xerox820_gfxlayout =
+{
+ 8, 8, /* 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*8 /* every char takes 8 bytes */
+};
+
+static GFXDECODE_START( xerox820 )
+ GFXDECODE_ENTRY( "chargen", 0x0000, xerox820_charlayout, 0, 1 )
+GFXDECODE_END
+
+static GFXDECODE_START( xerox820ii )
+ GFXDECODE_ENTRY( "chargen", 0x0000, xerox820_charlayout, 0, 1 )
+ GFXDECODE_ENTRY( "chargen", 0x0800, xerox820_gfxlayout, 0, 1 )
+GFXDECODE_END
+
+/* Machine Drivers */
+
+static MACHINE_CONFIG_START( xerox820, xerox820_state )
+ /* basic machine hardware */
+ MCFG_CPU_ADD(Z80_TAG, Z80, XTAL_20MHz/8)
+ MCFG_CPU_PROGRAM_MAP(xerox820_mem)
+ MCFG_CPU_IO_MAP(xerox820_io)
+ MCFG_CPU_CONFIG(xerox820_daisy_chain)
+
+ /* video hardware */
+ MCFG_SCREEN_ADD(SCREEN_TAG, RASTER)
+ MCFG_SCREEN_UPDATE_DRIVER(xerox820_state, screen_update)
+ MCFG_SCREEN_RAW_PARAMS(XTAL_10_69425MHz, 700, 0, 560, 260, 0, 240)
+
+ MCFG_GFXDECODE_ADD("gfxdecode", "palette", xerox820)
+ MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette")
+
+ /* devices */
+ MCFG_DEVICE_ADD(Z80PIO_KB_TAG, Z80PIO, XTAL_20MHz/8)
+ MCFG_Z80PIO_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
+ MCFG_Z80PIO_IN_PA_CB(READ8(xerox820_state, kbpio_pa_r))
+ MCFG_Z80PIO_OUT_PA_CB(WRITE8(xerox820_state, kbpio_pa_w))
+ MCFG_Z80PIO_IN_PB_CB(READ8(xerox820_state, kbpio_pb_r))
+
+ MCFG_DEVICE_ADD(Z80PIO_GP_TAG, Z80PIO, XTAL_20MHz/8)
+ MCFG_Z80PIO_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
+
+ MCFG_DEVICE_ADD(Z80CTC_TAG, Z80CTC, XTAL_20MHz/8)
+ MCFG_Z80CTC_INTR_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
+ MCFG_Z80CTC_ZC0_CB(DEVWRITELINE(Z80CTC_TAG, z80ctc_device, trg1))
+ MCFG_Z80CTC_ZC2_CB(DEVWRITELINE(Z80CTC_TAG, z80ctc_device, trg3))
+ //MCFG_TIMER_DRIVER_ADD_PERIODIC("ctc", xerox820_state, ctc_tick, attotime::from_hz(XTAL_20MHz/8))
+
+ MCFG_FD1771_ADD(FD1771_TAG, XTAL_20MHz/20)
+ MCFG_WD_FDC_INTRQ_CALLBACK(WRITELINE(xerox820_state, fdc_intrq_w))
+ MCFG_WD_FDC_DRQ_CALLBACK(WRITELINE(xerox820_state, fdc_drq_w))
+ MCFG_FLOPPY_DRIVE_ADD(FD1771_TAG":0", xerox820_floppies, "sa400", floppy_image_device::default_floppy_formats)
+ MCFG_FLOPPY_DRIVE_ADD(FD1771_TAG":1", xerox820_floppies, "sa400", floppy_image_device::default_floppy_formats)
+
+ MCFG_Z80SIO0_ADD(Z80SIO_TAG, XTAL_20MHz/8, 0, 0, 0, 0)
+ MCFG_Z80DART_OUT_TXDA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_txd))
+ MCFG_Z80DART_OUT_DTRA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_dtr))
+ MCFG_Z80DART_OUT_RTSA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_rts))
+ MCFG_Z80DART_OUT_TXDB_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_txd))
+ MCFG_Z80DART_OUT_DTRB_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_dtr))
+ MCFG_Z80DART_OUT_RTSB_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_rts))
+ MCFG_Z80DART_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
+
+ MCFG_RS232_PORT_ADD(RS232_A_TAG, default_rs232_devices, NULL)
+ MCFG_RS232_RXD_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80sio0_device, rxa_w))
+
+ MCFG_RS232_PORT_ADD(RS232_B_TAG, default_rs232_devices, NULL)
+ MCFG_RS232_RXD_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80sio0_device, rxb_w))
+
+ MCFG_DEVICE_ADD(COM8116_TAG, COM8116, XTAL_5_0688MHz)
+ MCFG_COM8116_FR_HANDLER(WRITELINE(xerox820_state, fr_w))
+ MCFG_COM8116_FT_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80dart_device, rxtxcb_w))
+
+ MCFG_DEVICE_ADD(KEYBOARD_TAG, XEROX_820_KEYBOARD, 0)
+ MCFG_XEROX_820_KEYBOARD_KBSTB_CALLBACK(DEVWRITELINE(Z80PIO_KB_TAG, z80pio_device, strobe_b))
+
+ /* internal ram */
+ MCFG_RAM_ADD(RAM_TAG)
+ MCFG_RAM_DEFAULT_SIZE("64K")
+
+ // software lists
+ MCFG_SOFTWARE_LIST_ADD("flop_list", "xerox820")
+MACHINE_CONFIG_END
+
+static MACHINE_CONFIG_DERIVED_CLASS( bigboard, xerox820, bigboard_state )
+ /* sound hardware */
+ MCFG_SPEAKER_STANDARD_MONO("mono")
+ MCFG_SOUND_ADD("beeper", BEEP, 0)
+ MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00) /* bigboard only */
+MACHINE_CONFIG_END
+
+static MACHINE_CONFIG_START( xerox820ii, xerox820ii_state )
+ /* basic machine hardware */
+ MCFG_CPU_ADD(Z80_TAG, Z80, XTAL_16MHz/4)
+ MCFG_CPU_PROGRAM_MAP(xerox820ii_mem)
+ MCFG_CPU_IO_MAP(xerox820ii_io)
+ MCFG_CPU_CONFIG(xerox820_daisy_chain)
+
+ /* video hardware */
+ MCFG_SCREEN_ADD(SCREEN_TAG, RASTER)
+ MCFG_SCREEN_UPDATE_DRIVER(xerox820ii_state, screen_update)
+ MCFG_SCREEN_RAW_PARAMS(XTAL_10_69425MHz, 700, 0, 560, 260, 0, 240)
+
+ MCFG_GFXDECODE_ADD("gfxdecode", "palette", xerox820ii)
+ MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette")
+
+ /* sound hardware */
+ MCFG_SPEAKER_STANDARD_MONO("mono")
+ MCFG_SOUND_ADD("speaker", SPEAKER_SOUND, 0)
+ MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)
+
+ /* devices */
+ MCFG_DEVICE_ADD(Z80PIO_KB_TAG, Z80PIO, XTAL_16MHz/4)
+ MCFG_Z80PIO_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
+ MCFG_Z80PIO_IN_PA_CB(READ8(xerox820_state, kbpio_pa_r))
+ MCFG_Z80PIO_OUT_PA_CB(WRITE8(xerox820_state, kbpio_pa_w))
+ MCFG_Z80PIO_IN_PB_CB(READ8(xerox820_state, kbpio_pb_r))
+
+ MCFG_DEVICE_ADD(Z80PIO_GP_TAG, Z80PIO, XTAL_16MHz/4)
+ MCFG_Z80PIO_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
+
+ MCFG_DEVICE_ADD(Z80PIO_RD_TAG, Z80PIO, XTAL_20MHz/8)
+ MCFG_Z80PIO_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
+ MCFG_Z80PIO_IN_PA_CB(DEVREAD8("sasi_data_in", input_buffer_device, read))
+ MCFG_Z80PIO_OUT_PA_CB(DEVWRITE8("sasi_data_out", output_latch_device, write))
+ MCFG_Z80PIO_OUT_ARDY_CB(WRITELINE(xerox820ii_state, rdpio_pardy_w))
+ MCFG_Z80PIO_IN_PB_CB(DEVREAD8("sasi_ctrl_in", input_buffer_device, read))
+ MCFG_Z80PIO_OUT_PB_CB(WRITE8(xerox820ii_state, rdpio_pb_w))
+
+ MCFG_DEVICE_ADD(Z80CTC_TAG, Z80CTC, XTAL_16MHz/4)
+ MCFG_Z80CTC_INTR_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
+ MCFG_Z80CTC_ZC0_CB(DEVWRITELINE(Z80CTC_TAG, z80ctc_device, trg1))
+ MCFG_Z80CTC_ZC2_CB(DEVWRITELINE(Z80CTC_TAG, z80ctc_device, trg3))
+ //MCFG_TIMER_DRIVER_ADD_PERIODIC("ctc", xerox820_state, ctc_tick, attotime::from_hz(XTAL_16MHz/4))
+
+ MCFG_FD1797_ADD(FD1797_TAG, XTAL_16MHz/8)
+ MCFG_WD_FDC_INTRQ_CALLBACK(WRITELINE(xerox820_state, fdc_intrq_w))
+ MCFG_WD_FDC_DRQ_CALLBACK(WRITELINE(xerox820_state, fdc_drq_w))
+ MCFG_FLOPPY_DRIVE_ADD(FD1797_TAG":0", xerox820_floppies, "sa450", floppy_image_device::default_floppy_formats)
+ MCFG_FLOPPY_DRIVE_ADD(FD1797_TAG":1", xerox820_floppies, "sa450", floppy_image_device::default_floppy_formats)
+
+ MCFG_Z80SIO0_ADD(Z80SIO_TAG, XTAL_16MHz/4, 0, 0, 0, 0)
+ MCFG_Z80DART_OUT_TXDA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_txd))
+ MCFG_Z80DART_OUT_DTRA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_dtr))
+ MCFG_Z80DART_OUT_RTSA_CB(DEVWRITELINE(RS232_A_TAG, rs232_port_device, write_rts))
+ MCFG_Z80DART_OUT_TXDB_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_txd))
+ MCFG_Z80DART_OUT_DTRB_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_dtr))
+ MCFG_Z80DART_OUT_RTSB_CB(DEVWRITELINE(RS232_B_TAG, rs232_port_device, write_rts))
+ MCFG_Z80DART_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
+
+ MCFG_RS232_PORT_ADD(RS232_A_TAG, default_rs232_devices, NULL)
+ MCFG_RS232_RXD_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80sio0_device, rxa_w))
+
+ MCFG_RS232_PORT_ADD(RS232_B_TAG, default_rs232_devices, NULL)
+ MCFG_RS232_RXD_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80sio0_device, rxb_w))
+
+ MCFG_DEVICE_ADD(COM8116_TAG, COM8116, XTAL_5_0688MHz)
+ MCFG_COM8116_FR_HANDLER(WRITELINE(xerox820_state, fr_w))
+ MCFG_COM8116_FT_HANDLER(DEVWRITELINE(Z80SIO_TAG, z80dart_device, rxtxcb_w))
+
+ MCFG_DEVICE_ADD(KEYBOARD_TAG, XEROX_820_KEYBOARD, 0)
+ MCFG_XEROX_820_KEYBOARD_KBSTB_CALLBACK(DEVWRITELINE(Z80PIO_KB_TAG, z80pio_device, strobe_b))
+
+ // SASI bus
+ MCFG_DEVICE_ADD(SASIBUS_TAG, SCSI_PORT, 0)
+ MCFG_SCSI_DATA_INPUT_BUFFER("sasi_data_in")
+ MCFG_SCSI_BSY_HANDLER(DEVWRITELINE("sasi_ctrl_in", input_buffer_device, write_bit0)) MCFG_DEVCB_XOR(1)
+ MCFG_SCSI_MSG_HANDLER(DEVWRITELINE("sasi_ctrl_in", input_buffer_device, write_bit1)) MCFG_DEVCB_XOR(1)
+ MCFG_SCSI_CD_HANDLER(DEVWRITELINE("sasi_ctrl_in", input_buffer_device, write_bit2)) MCFG_DEVCB_XOR(1)
+ MCFG_SCSI_REQ_HANDLER(DEVWRITELINE("sasi_ctrl_in", input_buffer_device, write_bit3)) MCFG_DEVCB_XOR(1)
+ MCFG_SCSI_IO_HANDLER(DEVWRITELINE("sasi_ctrl_in", input_buffer_device, write_bit4)) MCFG_DEVCB_XOR(1)
+
+ MCFG_SCSIDEV_ADD(SASIBUS_TAG ":" SCSI_PORT_DEVICE1, "harddisk", SA1403D, SCSI_ID_0)
+
+ MCFG_SCSI_OUTPUT_LATCH_ADD("sasi_data_out", SASIBUS_TAG)
+ MCFG_DEVICE_ADD("sasi_data_in", INPUT_BUFFER, 0)
+ MCFG_DEVICE_ADD("sasi_ctrl_in", INPUT_BUFFER, 0)
+
+ /* internal ram */
+ MCFG_RAM_ADD(RAM_TAG)
+ MCFG_RAM_DEFAULT_SIZE("64K")
+
+ // software lists
+ MCFG_SOFTWARE_LIST_ADD("flop_list", "xerox820ii")
+MACHINE_CONFIG_END
+
+static MACHINE_CONFIG_DERIVED( xerox168, xerox820ii )
+ MCFG_CPU_ADD(I8086_TAG, I8086, 4770000)
+ MCFG_CPU_PROGRAM_MAP(xerox168_mem)
+
+ /* internal ram */
+ MCFG_RAM_MODIFY(RAM_TAG)
+ MCFG_RAM_DEFAULT_SIZE("192K")
+ MCFG_RAM_EXTRA_OPTIONS("320K")
+MACHINE_CONFIG_END
+
+static MACHINE_CONFIG_DERIVED( mk83, xerox820 )
+ MCFG_CPU_MODIFY(Z80_TAG)
+ MCFG_CPU_PROGRAM_MAP(mk83_mem)
+MACHINE_CONFIG_END
+
+/* ROMs */
+
+ROM_START( bigboard )
+ ROM_REGION( 0x1000, Z80_TAG, 0 )
+ ROM_LOAD( "bigboard.u67", 0x0000, 0x0800, CRC(5a85a228) SHA1(d51a2cbd0aae80315bda9530275aabfe8305364e) )
+
+ ROM_REGION( 0x800, "chargen", 0 )
+ ROM_LOAD( "bigboard.u73", 0x0000, 0x0800, CRC(10bf0d81) SHA1(7ec73670a4d9d6421a5d6a4c4edc8b7c87923f6c) )
+ROM_END
+
+#define rom_mk82 rom_bigboard
+
+ROM_START( x820 )
+ ROM_REGION( 0x1000, Z80_TAG, 0 )
+ ROM_DEFAULT_BIOS( "v20" )
+ ROM_SYSTEM_BIOS( 0, "v10", "Xerox Monitor v1.0" )
+ ROMX_LOAD( "x820v10.u64", 0x0000, 0x0800, NO_DUMP, ROM_BIOS(1) )
+ ROMX_LOAD( "x820v10.u63", 0x0800, 0x0800, NO_DUMP, ROM_BIOS(1) )
+ ROM_SYSTEM_BIOS( 1, "v20", "Xerox Monitor v2.0" )
+ ROMX_LOAD( "x820v20.u64", 0x0000, 0x0800, CRC(2fc227e2) SHA1(b4ea0ae23d281a687956e8a514cb364a1372678e), ROM_BIOS(2) )
+ ROMX_LOAD( "x820v20.u63", 0x0800, 0x0800, CRC(bc11f834) SHA1(4fd2b209a6e6ff9b0c41800eb5228c34a0d7f7ef), ROM_BIOS(2) )
+ ROM_SYSTEM_BIOS( 2, "smart23", "MICROCode SmartROM v2.3" )
+ ROMX_LOAD( "mxkx25a.u64", 0x0000, 0x0800, CRC(7ec5f100) SHA1(5d0ff35a51aa18afc0d9c20ef99ff5d9d3f2075b), ROM_BIOS(3) )
+ ROMX_LOAD( "mxkx25b.u63", 0x0800, 0x0800, CRC(a7543798) SHA1(886e617e1003d13f86f33085cbd49391b77291a3), ROM_BIOS(3) )
+ ROM_SYSTEM_BIOS( 3, "plus2", "MICROCode Plus2 v0.2a" )
+ ROMX_LOAD( "p2x25a.u64", 0x0000, 0x0800, CRC(3ccd7a8f) SHA1(6e46c88f03fc7289595dd6bec95e23bb13969525), ROM_BIOS(4) )
+ ROMX_LOAD( "p2x25b.u63", 0x0800, 0x0800, CRC(1e580391) SHA1(e91f8ce82586df33c0d6d02eb005e8079f4de67d), ROM_BIOS(4) )
+
+ ROM_REGION( 0x800, "chargen", 0 )
+ ROM_LOAD( "x820.u92", 0x0000, 0x0800, CRC(b823fa98) SHA1(ad0ea346aa257a53ad5701f4201896a2b3a0f928) )
+ROM_END
+
+ROM_START( x820ii )
+ ROM_REGION( 0x2000, Z80_TAG, 0 )
+ ROM_DEFAULT_BIOS( "v404" )
+ ROM_SYSTEM_BIOS( 0, "v400", "Balcones Operating System v4.00" ) // Initial U.S. 3-ROM set: support for double density disks
+ ROMX_LOAD( "v400.u33", 0x0000, 0x0800, NO_DUMP, ROM_BIOS(1) )
+ ROMX_LOAD( "v400.u34", 0x0800, 0x0800, NO_DUMP, ROM_BIOS(1) )
+ ROMX_LOAD( "v400.u35", 0x1000, 0x0800, NO_DUMP, ROM_BIOS(1) )
+ ROM_SYSTEM_BIOS( 1, "v401", "Balcones Operating System v4.01" ) // Corrected overflow problem with large data files
+ ROMX_LOAD( "v401.u33", 0x0000, 0x0800, NO_DUMP, ROM_BIOS(2) )
+ ROMX_LOAD( "v401.u34", 0x0800, 0x0800, NO_DUMP, ROM_BIOS(2) )
+ ROMX_LOAD( "v401.u35", 0x1000, 0x0800, NO_DUMP, ROM_BIOS(2) )
+ ROM_SYSTEM_BIOS( 2, "v402", "Balcones Operating System v4.02" ) // Rank Xerox (European) boot ROM version of US 4.01
+ ROMX_LOAD( "v402.u33", 0x0000, 0x0800, NO_DUMP, ROM_BIOS(3) )
+ ROMX_LOAD( "v402.u34", 0x0800, 0x0800, NO_DUMP, ROM_BIOS(3) )
+ ROMX_LOAD( "v402.u35", 0x1000, 0x0800, NO_DUMP, ROM_BIOS(3) )
+ ROM_SYSTEM_BIOS( 3, "v403", "Balcones Operating System v4.03" ) // Incorporate programmable communications option and support for the low-profile keyboard (4-ROM set and type-ahead input buffer)
+ ROMX_LOAD( "v403.u33", 0x0000, 0x0800, NO_DUMP, ROM_BIOS(4) )
+ ROMX_LOAD( "v403.u34", 0x0800, 0x0800, NO_DUMP, ROM_BIOS(4) )
+ ROMX_LOAD( "v403.u35", 0x1000, 0x0800, NO_DUMP, ROM_BIOS(4) )
+ ROMX_LOAD( "v403.u36", 0x1800, 0x0800, NO_DUMP, ROM_BIOS(4) )
+ ROM_SYSTEM_BIOS( 4, "v404", "Balcones Operating System v4.04" ) // Changes sign-on message from Xerox 820-II to Xerox
+ ROMX_LOAD( "537p3652.u33", 0x0000, 0x0800, CRC(7807cfbb) SHA1(bd3cc5cc5c59c84a50747aae5c17eb4617b0dbc3), ROM_BIOS(5) )
+ ROMX_LOAD( "537p3653.u34", 0x0800, 0x0800, CRC(a9c6c0c3) SHA1(c2da9d1bf0da96e6b8bfa722783e411d2fe6deb9), ROM_BIOS(5) )
+ ROMX_LOAD( "537p3654.u35", 0x1000, 0x0800, CRC(a8a07223) SHA1(e8ae1ebf2d7caf76771205f577b88ae493836ac9), ROM_BIOS(5) )
+ ROMX_LOAD( "v404.u36", 0x1800, 0x0800, NO_DUMP, ROM_BIOS(5) ) // fitted for low-profile keyboard only
+ ROM_SYSTEM_BIOS( 5, "v50", "Balcones Operating System v5.0" ) // Operating system modifications for DEM and new 5.25" disk controller (4 new boot ROMs)
+ ROMX_LOAD( "v50.u33", 0x0000, 0x0800, NO_DUMP, ROM_BIOS(6) )
+ ROMX_LOAD( "v50.u34", 0x0800, 0x0800, NO_DUMP, ROM_BIOS(6) )
+ ROMX_LOAD( "v50.u35", 0x1000, 0x0800, NO_DUMP, ROM_BIOS(6) )
+ ROMX_LOAD( "v50.u36", 0x1800, 0x0800, NO_DUMP, ROM_BIOS(6) ) // fitted for low-profile keyboard only
+
+ ROM_REGION( 0x1000, "chargen", 0 )
+ ROM_LOAD( "x820ii.u57", 0x0000, 0x0800, CRC(1a50f600) SHA1(df4470c80611c14fa7ea8591f741fbbecdfe4fd9) )
+ ROM_LOAD( "x820ii.u58", 0x0800, 0x0800, CRC(aca4b9b3) SHA1(77f41470b0151945b8d3c3a935fc66409e9157b3) )
+ROM_END
+
+ROM_START( x168 )
+ ROM_REGION( 0x2000, Z80_TAG, 0 )
+ ROM_DEFAULT_BIOS( "v404" )
+ ROM_SYSTEM_BIOS( 0, "v404", "Balcones Operating System v4.04" ) // Changes sign-on message from Xerox 820-II to Xerox
+ ROMX_LOAD( "537p3652.u33", 0x0000, 0x0800, CRC(7807cfbb) SHA1(bd3cc5cc5c59c84a50747aae5c17eb4617b0dbc3), ROM_BIOS(1) )
+ ROMX_LOAD( "537p3653.u34", 0x0800, 0x0800, CRC(a9c6c0c3) SHA1(c2da9d1bf0da96e6b8bfa722783e411d2fe6deb9), ROM_BIOS(1) )
+ ROMX_LOAD( "537p3654.u35", 0x1000, 0x0800, CRC(a8a07223) SHA1(e8ae1ebf2d7caf76771205f577b88ae493836ac9), ROM_BIOS(1) )
+ ROMX_LOAD( "v404.u36", 0x1800, 0x0800, NO_DUMP, ROM_BIOS(1) ) // fitted for low-profile keyboard only
+ ROM_SYSTEM_BIOS( 1, "v50", "Balcones Operating System v5.0" ) // Operating system modifications for DEM and new 5.25" disk controller (4 new boot ROMs)
+ ROMX_LOAD( "v50.u33", 0x0000, 0x0800, NO_DUMP, ROM_BIOS(2) )
+ ROMX_LOAD( "v50.u34", 0x0800, 0x0800, NO_DUMP, ROM_BIOS(2) )
+ ROMX_LOAD( "v50.u35", 0x1000, 0x0800, NO_DUMP, ROM_BIOS(2) )
+ ROMX_LOAD( "v50.u36", 0x1800, 0x0800, NO_DUMP, ROM_BIOS(2) ) // fitted for low-profile keyboard only
+
+ ROM_REGION( 0x1000, I8086_TAG, 0 )
+ ROM_LOAD( "8086.u33", 0x0000, 0x1000, CRC(ee49e3dc) SHA1(a5f20c74fc53f9d695d8894534ab69a39e2c38d8) )
+
+ ROM_REGION( 0x1000, "chargen", 0 )
+ ROM_LOAD( "x820ii.u57", 0x0000, 0x0800, CRC(1a50f600) SHA1(df4470c80611c14fa7ea8591f741fbbecdfe4fd9) )
+ ROM_LOAD( "x820ii.u58", 0x0800, 0x0800, CRC(aca4b9b3) SHA1(77f41470b0151945b8d3c3a935fc66409e9157b3) )
+ROM_END
+
+ROM_START( mk83 )
+ ROM_REGION( 0x1000, Z80_TAG, 0 )
+ ROM_LOAD( "2732mk83.bin", 0x0000, 0x1000, CRC(a845c7e1) SHA1(3ccf629c5cd384953794ac4a1d2b45678bd40e92) )
+
+ ROM_REGION( 0x800, "chargen", 0 )
+ ROM_LOAD( "2716mk83.bin", 0x0000, 0x0800, CRC(10bf0d81) SHA1(7ec73670a4d9d6421a5d6a4c4edc8b7c87923f6c) )
+ROM_END
+
+/* System Drivers */
+
+/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */
+COMP( 1980, bigboard, 0, 0, bigboard, xerox820, driver_device, 0, "Digital Research Computers", "Big Board", 0 )
+COMP( 1981, x820, bigboard, 0, xerox820, xerox820, driver_device, 0, "Xerox", "Xerox 820", MACHINE_NO_SOUND_HW )
+COMP( 1982, mk82, bigboard, 0, bigboard, xerox820, driver_device, 0, "Scomar", "MK-82", 0 )
+COMP( 1983, x820ii, 0, 0, xerox820ii, xerox820, driver_device, 0, "Xerox", "Xerox 820-II", MACHINE_NOT_WORKING )
+COMP( 1983, x168, x820ii, 0, xerox168, xerox820, driver_device, 0, "Xerox", "Xerox 16/8", MACHINE_NOT_WORKING )
+COMP( 1983, mk83, x820ii, 0, mk83, xerox820, driver_device, 0, "Scomar", "MK-83", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW )