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Diffstat (limited to 'src/mame/drivers/xerox820.cpp')
-rw-r--r--src/mame/drivers/xerox820.cpp937
1 files changed, 0 insertions, 937 deletions
diff --git a/src/mame/drivers/xerox820.cpp b/src/mame/drivers/xerox820.cpp
deleted file mode 100644
index f208d96f4c1..00000000000
--- a/src/mame/drivers/xerox820.cpp
+++ /dev/null
@@ -1,937 +0,0 @@
-// 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://www.vintagesbc.it/?page_id=233
- http://mccworkshop.com/computers/comphistory7.htm
- http://bitsavers.org/bits/Xerox/820/
- http://bitsavers.org/bits/Xerox/820-II/
- http://www.classiccmp.org/dunfield/img54306/system.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
-
- SmartROM and Plus2 ROM both come for 2.5MHz or 4MHz systems, and there is another distinction between variants for generic or Xerox keyboards
- http://www.microcodeconsulting.com/z80/plus2.htm
- http://www.microcodeconsulting.com/z80/smartrom.htm
-
-*/
-
-
-#include "emu.h"
-#include "includes/xerox820.h"
-
-#include "screen.h"
-#include "softlist.h"
-#include "speaker.h"
-
-
-/* Read/Write Handlers */
-
-void xerox820_state::bankswitch(int bank)
-{
- address_space &program = m_maincpu->space(AS_PROGRAM);
- uint8_t *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_t *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->read(offset) ^ 0xff;
-}
-
-WRITE8_MEMBER( xerox820_state::fdc_w )
-{
- m_fdc->write(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 */
-
-void xerox820_state::xerox820_mem(address_map &map)
-{
- map.unmap_value_high();
- map(0x3000, 0x3fff).ram().share("video_ram");
- map(0x4000, 0xffff).ram();
-}
-
-void xerox820_state::xerox820_io(address_map &map)
-{
- map(0x00, 0x00).mirror(0xff03).w(COM8116_TAG, FUNC(com8116_device::str_w));
- map(0x04, 0x07).mirror(0xff00).rw(m_sio, FUNC(z80sio0_device::ba_cd_r), FUNC(z80sio0_device::ba_cd_w));
- map(0x08, 0x0b).mirror(0xff00).rw(Z80PIO_GP_TAG, FUNC(z80pio_device::read_alt), FUNC(z80pio_device::write_alt));
- map(0x0c, 0x0c).mirror(0xff03).w(COM8116_TAG, FUNC(com8116_device::stt_w));
- map(0x10, 0x13).mirror(0xff00).rw(FUNC(xerox820_state::fdc_r), FUNC(xerox820_state::fdc_w));
- map(0x14, 0x14).mirror(0x0003).select(0xff00).w(FUNC(xerox820_state::scroll_w));
- map(0x18, 0x1b).mirror(0xff00).rw(m_ctc, FUNC(z80ctc_device::read), FUNC(z80ctc_device::write));
- map(0x1c, 0x1f).mirror(0xff00).rw(m_kbpio, FUNC(z80pio_device::read_alt), FUNC(z80pio_device::write_alt));
-}
-
-void xerox820ii_state::xerox820ii_mem(address_map &map)
-{
- map.unmap_value_high();
- map(0x3000, 0x3fff).ram().share("video_ram");
- map(0xc000, 0xffff).ram();
-}
-
-void xerox820ii_state::xerox820ii_io(address_map &map)
-{
- xerox820_io(map);
- map(0x28, 0x29).mirror(0xff00).w(FUNC(xerox820ii_state::bell_w));
- map(0x30, 0x31).mirror(0xff00).w(FUNC(xerox820ii_state::slden_w));
- map(0x34, 0x35).mirror(0xff00).w(FUNC(xerox820ii_state::chrom_w));
- map(0x36, 0x36).mirror(0xff00).w(FUNC(xerox820ii_state::lowlite_w));
- map(0x68, 0x69).mirror(0xff00).w(FUNC(xerox820ii_state::sync_w));
-}
-
-void xerox820ii_state::xerox168_mem(address_map &map)
-{
- map(0x00000, 0x3ffff).ram();
- map(0xff000, 0xfffff).rom().region(I8086_TAG, 0);
-}
-
-void xerox820_state::mk83_mem(address_map &map)
-{
- map.unmap_value_high();
- map(0x3000, 0x6fff).ram();
- map(0x7000, 0x7fff).ram().share("video_ram");
- map(0x8000, 0xffff).ram();
-}
-
-
-/* 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_t 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 = nullptr;
-
- 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 ? 20_MHz_XTAL / 10 : 20_MHz_XTAL / 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 },
- { nullptr }
-};
-
-
-
-/***********************************************************
-
- Quickload
-
- This loads a .COM file to address 0x100 then jumps
- there. Sometimes .COM has been renamed to .CPM to
- prevent windows going ballistic. These can be loaded
- as well.
-
-************************************************************/
-
-QUICKLOAD_LOAD_MEMBER(xerox820_state::quickload_cb)
-{
- address_space& prog_space = m_maincpu->space(AS_PROGRAM);
-
- if (quickload_size >= 0xfd00)
- return image_init_result::FAIL;
-
- bankswitch(0);
-
- /* Avoid loading a program if CP/M-80 is not in memory */
- if ((prog_space.read_byte(0) != 0xc3) || (prog_space.read_byte(5) != 0xc3))
- {
- machine_reset();
- return image_init_result::FAIL;
- }
-
- /* Load image to the TPA (Transient Program Area) */
- for (uint16_t i = 0; i < quickload_size; i++)
- {
- uint8_t data;
- if (image.fread( &data, 1) != 1)
- return image_init_result::FAIL;
- prog_space.write_byte(i+0x100, data);
- }
-
- /* clear out command tail */
- prog_space.write_byte(0x80, 0); prog_space.write_byte(0x81, 0);
-
- /* Roughly set SP basing on the BDOS position */
- m_maincpu->set_state_int(Z80_SP, 256 * prog_space.read_byte(7) - 300);
- m_maincpu->set_pc(0x100); // start program
-
- return image_init_result::PASS;
-}
-
-
-
-/* WD1771 Interface */
-
-static void xerox820_floppies(device_slot_interface &device)
-{
- device.option_add("sa400", FLOPPY_525_SSSD_35T); // Shugart SA-400, 35 trk drive
- device.option_add("sa400l", FLOPPY_525_SSSD); // Shugart SA-400, 40 trk drive
- device.option_add("sa450", FLOPPY_525_DD); // Shugart SA-450
- device.option_add("sa800", FLOPPY_8_SSDD); // Shugart SA-800
- device.option_add("sa850", FLOPPY_8_DSDD); // Shugart SA-850
-}
-
-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();
-}
-
-/* Video */
-
-uint32_t xerox820_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
-{
- uint8_t y,ra,chr,gfx;
- uint16_t 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_t *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_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( gfx_xerox820 )
- GFXDECODE_ENTRY( "chargen", 0x0000, xerox820_charlayout, 0, 1 )
-GFXDECODE_END
-
-static GFXDECODE_START( gfx_xerox820ii )
- GFXDECODE_ENTRY( "chargen", 0x0000, xerox820_charlayout, 0, 1 )
- GFXDECODE_ENTRY( "chargen", 0x0800, xerox820_gfxlayout, 0, 1 )
-GFXDECODE_END
-
-/* Machine Drivers */
-
-void xerox820_state::xerox820(machine_config &config)
-{
- /* basic machine hardware */
- Z80(config, m_maincpu, 20_MHz_XTAL / 8);
- m_maincpu->set_addrmap(AS_PROGRAM, &xerox820_state::xerox820_mem);
- m_maincpu->set_addrmap(AS_IO, &xerox820_state::xerox820_io);
- m_maincpu->set_daisy_config(xerox820_daisy_chain);
-
- /* video hardware */
- screen_device &screen(SCREEN(config, SCREEN_TAG, SCREEN_TYPE_RASTER));
- screen.set_screen_update(FUNC(xerox820_state::screen_update));
- screen.set_raw(10.69425_MHz_XTAL, 700, 0, 560, 260, 0, 240);
-
- GFXDECODE(config, "gfxdecode", m_palette, gfx_xerox820);
- PALETTE(config, m_palette, palette_device::MONOCHROME);
-
- /* devices */
- Z80PIO(config, m_kbpio, 20_MHz_XTAL / 8);
- m_kbpio->out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
- m_kbpio->in_pa_callback().set(FUNC(xerox820_state::kbpio_pa_r));
- m_kbpio->out_pa_callback().set(FUNC(xerox820_state::kbpio_pa_w));
- m_kbpio->in_pb_callback().set(FUNC(xerox820_state::kbpio_pb_r));
-
- z80pio_device& pio_gp(Z80PIO(config, Z80PIO_GP_TAG, 20_MHz_XTAL / 8));
- pio_gp.out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
-
- Z80CTC(config, m_ctc, 20_MHz_XTAL / 8);
- m_ctc->intr_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
- m_ctc->zc_callback<0>().set(m_ctc, FUNC(z80ctc_device::trg1));
- m_ctc->zc_callback<2>().set(m_ctc, FUNC(z80ctc_device::trg3));
- //TIMER(config, "ctc").configure_periodic(FUNC(xerox820_state::ctc_tick), attotime::from_hz(20_MHz_XTAL / 8));
-
- FD1771(config, m_fdc, 20_MHz_XTAL / 20);
- m_fdc->intrq_wr_callback().set(FUNC(xerox820_state::fdc_intrq_w));
- m_fdc->drq_wr_callback().set(FUNC(xerox820_state::fdc_drq_w));
- FLOPPY_CONNECTOR(config, FD1771_TAG":0", xerox820_floppies, "sa400l", floppy_image_device::default_floppy_formats);
- FLOPPY_CONNECTOR(config, FD1771_TAG":1", xerox820_floppies, "sa400l", floppy_image_device::default_floppy_formats);
-
- Z80SIO0(config, m_sio, 20_MHz_XTAL / 8);
- m_sio->out_txda_callback().set(RS232_A_TAG, FUNC(rs232_port_device::write_txd));
- m_sio->out_dtra_callback().set(RS232_A_TAG, FUNC(rs232_port_device::write_dtr));
- m_sio->out_rtsa_callback().set(RS232_A_TAG, FUNC(rs232_port_device::write_rts));
- m_sio->out_txdb_callback().set(RS232_B_TAG, FUNC(rs232_port_device::write_txd));
- m_sio->out_dtrb_callback().set(RS232_B_TAG, FUNC(rs232_port_device::write_dtr));
- m_sio->out_rtsb_callback().set(RS232_B_TAG, FUNC(rs232_port_device::write_rts));
- m_sio->out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
-
- rs232_port_device &rs232a(RS232_PORT(config, RS232_A_TAG, default_rs232_devices, nullptr));
- rs232a.rxd_handler().set(m_sio, FUNC(z80sio0_device::rxa_w));
-
- rs232_port_device &rs232b(RS232_PORT(config, RS232_B_TAG, default_rs232_devices, nullptr));
- rs232b.rxd_handler().set(m_sio, FUNC(z80sio0_device::rxb_w));
-
- com8116_device &dbrg(COM8116(config, COM8116_TAG, 5.0688_MHz_XTAL));
- dbrg.fr_handler().set(m_sio, FUNC(z80dart_device::rxca_w));
- dbrg.fr_handler().append(m_sio, FUNC(z80dart_device::txca_w));
- dbrg.ft_handler().set(m_sio, FUNC(z80dart_device::rxtxcb_w));
-
- XEROX_820_KEYBOARD(config, m_kb, 0);
- m_kb->kbstb_wr_callback().set(m_kbpio, FUNC(z80pio_device::strobe_b));
-
- /* internal ram */
- RAM(config, m_ram).set_default_size("64K");
-
- // software lists
- SOFTWARE_LIST(config, "flop_list").set_original("xerox820");
- QUICKLOAD(config, "quickload", "com,cpm", attotime::from_seconds(3)).set_load_callback(FUNC(xerox820_state::quickload_cb));
-}
-
-void bigboard_state::bigboard(machine_config &config)
-{
- xerox820(config);
- /* sound hardware */
- SPEAKER(config, "mono").front_center();
- BEEP(config, m_beeper, 950).add_route(ALL_OUTPUTS, "mono", 1.00); /* bigboard only */
-}
-
-void xerox820ii_state::xerox820ii(machine_config &config)
-{
- /* basic machine hardware */
- Z80(config, m_maincpu, 16_MHz_XTAL / 4);
- m_maincpu->set_addrmap(AS_PROGRAM, &xerox820ii_state::xerox820ii_mem);
- m_maincpu->set_addrmap(AS_IO, &xerox820ii_state::xerox820ii_io);
- m_maincpu->set_daisy_config(xerox820_daisy_chain);
-
- /* video hardware */
- screen_device &screen(SCREEN(config, SCREEN_TAG, SCREEN_TYPE_RASTER));
- screen.set_screen_update(FUNC(xerox820ii_state::screen_update));
- screen.set_raw(10.69425_MHz_XTAL, 700, 0, 560, 260, 0, 240);
-
- GFXDECODE(config, "gfxdecode", m_palette, gfx_xerox820ii);
- PALETTE(config, m_palette, palette_device::MONOCHROME);
-
- /* sound hardware */
- SPEAKER(config, "mono").front_center();
- SPEAKER_SOUND(config, m_speaker).add_route(ALL_OUTPUTS, "mono", 0.50);
-
- /* devices */
- Z80PIO(config, m_kbpio, 16_MHz_XTAL / 4);
- m_kbpio->out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
- m_kbpio->in_pa_callback().set(FUNC(xerox820_state::kbpio_pa_r));
- m_kbpio->out_pa_callback().set(FUNC(xerox820_state::kbpio_pa_w));
- m_kbpio->in_pb_callback().set(FUNC(xerox820_state::kbpio_pb_r));
-
- z80pio_device& pio_gp(Z80PIO(config, Z80PIO_GP_TAG, 16_MHz_XTAL / 4));
- pio_gp.out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
-
- z80pio_device& pio_rd(Z80PIO(config, Z80PIO_RD_TAG, 20_MHz_XTAL / 8));
- pio_rd.out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
- pio_rd.in_pa_callback().set("sasi_data_in", FUNC(input_buffer_device::bus_r));
- pio_rd.out_pa_callback().set("sasi_data_out", FUNC(output_latch_device::bus_w));
- pio_rd.out_ardy_callback().set(FUNC(xerox820ii_state::rdpio_pardy_w));
- pio_rd.in_pb_callback().set("sasi_ctrl_in", FUNC(input_buffer_device::bus_r));
- pio_rd.out_pb_callback().set(FUNC(xerox820ii_state::rdpio_pb_w));
-
- Z80CTC(config, m_ctc, 16_MHz_XTAL / 4);
- m_ctc->intr_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
- m_ctc->zc_callback<0>().set(m_ctc, FUNC(z80ctc_device::trg1));
- m_ctc->zc_callback<2>().set(m_ctc, FUNC(z80ctc_device::trg3));
- //TIMER(config, "ctc").configure_periodic(FUNC(xerox820_state::ctc_tick), attotime::from_hz(16_MHz_XTAL / 4));
-
- FD1797(config, m_fdc, 16_MHz_XTAL / 8);
- m_fdc->intrq_wr_callback().set(FUNC(xerox820_state::fdc_intrq_w));
- m_fdc->drq_wr_callback().set(FUNC(xerox820_state::fdc_drq_w));
- FLOPPY_CONNECTOR(config, FD1797_TAG":0", xerox820_floppies, "sa450", floppy_image_device::default_floppy_formats);
- FLOPPY_CONNECTOR(config, FD1797_TAG":1", xerox820_floppies, "sa450", floppy_image_device::default_floppy_formats);
-
- Z80SIO0(config, m_sio, 16_MHz_XTAL / 4);
- m_sio->out_txda_callback().set(RS232_A_TAG, FUNC(rs232_port_device::write_txd));
- m_sio->out_dtra_callback().set(RS232_A_TAG, FUNC(rs232_port_device::write_dtr));
- m_sio->out_rtsa_callback().set(RS232_A_TAG, FUNC(rs232_port_device::write_rts));
- m_sio->out_txdb_callback().set(RS232_B_TAG, FUNC(rs232_port_device::write_txd));
- m_sio->out_dtrb_callback().set(RS232_B_TAG, FUNC(rs232_port_device::write_dtr));
- m_sio->out_rtsb_callback().set(RS232_B_TAG, FUNC(rs232_port_device::write_rts));
- m_sio->out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
-
- rs232_port_device &rs232a(RS232_PORT(config, RS232_A_TAG, default_rs232_devices, nullptr));
- rs232a.rxd_handler().set(m_sio, FUNC(z80sio0_device::rxa_w));
-
- rs232_port_device &rs232b(RS232_PORT(config, RS232_B_TAG, default_rs232_devices, nullptr));
- rs232b.rxd_handler().set(m_sio, FUNC(z80sio0_device::rxb_w));
-
- com8116_device &dbrg(COM8116(config, COM8116_TAG, 5.0688_MHz_XTAL));
- dbrg.fr_handler().set(m_sio, FUNC(z80dart_device::rxca_w));
- dbrg.fr_handler().append(m_sio, FUNC(z80dart_device::txca_w));
- dbrg.ft_handler().set(m_sio, FUNC(z80dart_device::rxtxcb_w));
-
- XEROX_820_KEYBOARD(config, m_kb, 0);
- m_kb->kbstb_wr_callback().set(m_kbpio, FUNC(z80pio_device::strobe_b));
-
- // SASI bus
- SCSI_PORT(config, m_sasibus, 0);
- m_sasibus->set_data_input_buffer("sasi_data_in");
- m_sasibus->bsy_handler().set("sasi_ctrl_in", FUNC(input_buffer_device::write_bit0)).exor(1);
- m_sasibus->msg_handler().set("sasi_ctrl_in", FUNC(input_buffer_device::write_bit1)).exor(1);
- m_sasibus->cd_handler().set("sasi_ctrl_in", FUNC(input_buffer_device::write_bit2)).exor(1);
- m_sasibus->req_handler().set("sasi_ctrl_in", FUNC(input_buffer_device::write_bit3)).exor(1);
- m_sasibus->io_handler().set("sasi_ctrl_in", FUNC(input_buffer_device::write_bit4)).exor(1);
- m_sasibus->set_slot_device(1, "harddisk", SA1403D, DEVICE_INPUT_DEFAULTS_NAME(SCSI_ID_0));
-
- output_latch_device &sasi_data_out(OUTPUT_LATCH(config, "sasi_data_out"));
- m_sasibus->set_output_latch(sasi_data_out);
- INPUT_BUFFER(config, "sasi_data_in");
- INPUT_BUFFER(config, "sasi_ctrl_in");
-
- /* internal ram */
- RAM(config, m_ram).set_default_size("64K");
-
- // software lists
- SOFTWARE_LIST(config, "flop_list").set_original("xerox820ii");
- QUICKLOAD(config, "quickload", "com,cpm", attotime::from_seconds(3)).set_load_callback(FUNC(xerox820_state::quickload_cb));
-}
-
-void xerox820ii_state::xerox168(machine_config &config)
-{
- xerox820ii(config);
- i8086_cpu_device &i8086(I8086(config, I8086_TAG, 4770000));
- i8086.set_addrmap(AS_PROGRAM, &xerox820ii_state::xerox168_mem);
-
- /* internal ram */
- m_ram->set_default_size("192K").set_extra_options("320K");
-}
-
-void xerox820_state::mk83(machine_config & config)
-{
- xerox820(config);
-
- m_maincpu->set_addrmap(AS_PROGRAM, &xerox820_state::mk83_mem);
-}
-
-/* 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(0) )
- ROMX_LOAD( "x820v10.u63", 0x0800, 0x0800, NO_DUMP, ROM_BIOS(0) )
- ROM_SYSTEM_BIOS( 1, "v20", "Xerox Monitor v2.0" )
- ROMX_LOAD( "x820v20.u64", 0x0000, 0x0800, CRC(2fc227e2) SHA1(b4ea0ae23d281a687956e8a514cb364a1372678e), ROM_BIOS(1) )
- ROMX_LOAD( "x820v20.u63", 0x0800, 0x0800, CRC(bc11f834) SHA1(4fd2b209a6e6ff9b0c41800eb5228c34a0d7f7ef), ROM_BIOS(1) )
- ROM_SYSTEM_BIOS( 2, "smart23", "MICROCode SmartROM v2.3" )
- ROMX_LOAD( "mxkx25a.u64", 0x0000, 0x0800, CRC(7ec5f100) SHA1(5d0ff35a51aa18afc0d9c20ef99ff5d9d3f2075b), ROM_BIOS(2) )
- ROMX_LOAD( "mxkx25b.u63", 0x0800, 0x0800, CRC(a7543798) SHA1(886e617e1003d13f86f33085cbd49391b77291a3), ROM_BIOS(2) )
- ROM_SYSTEM_BIOS( 3, "plus2", "MICROCode Plus2 v0.2a" )
- ROMX_LOAD( "p2x25a.u64", 0x0000, 0x0800, CRC(3ccd7a8f) SHA1(6e46c88f03fc7289595dd6bec95e23bb13969525), ROM_BIOS(3) )
- ROMX_LOAD( "p2x25b.u63", 0x0800, 0x0800, CRC(1e580391) SHA1(e91f8ce82586df33c0d6d02eb005e8079f4de67d), ROM_BIOS(3) )
-
- 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(0) )
- ROMX_LOAD( "v400.u34", 0x0800, 0x0800, NO_DUMP, ROM_BIOS(0) )
- ROMX_LOAD( "v400.u35", 0x1000, 0x0800, NO_DUMP, ROM_BIOS(0) )
-
- 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(1) )
- ROMX_LOAD( "v401.u34", 0x0800, 0x0800, NO_DUMP, ROM_BIOS(1) )
- ROMX_LOAD( "v401.u35", 0x1000, 0x0800, NO_DUMP, ROM_BIOS(1) )
-
- ROM_SYSTEM_BIOS( 2, "v402", "Balcones Operating System v4.02" ) // Rank Xerox (European) boot ROM version of US 4.01
- ROMX_LOAD( "u33.4.02.rom", 0x0000, 0x0800, CRC(d9eb668e) SHA1(6acbef96e4e6526c58e068b7849fb9cce2ea2a10), ROM_BIOS(2) )
- ROMX_LOAD( "u34.4.02.rom", 0x0800, 0x0800, CRC(62181209) SHA1(2238aec096d19af9307bb294532f66f53dd7dfc3), ROM_BIOS(2) )
- ROMX_LOAD( "u35.4.02.rom", 0x1000, 0x0800, CRC(e22fbf6d) SHA1(6c162f79d42611176b0f1c0e8a4eeb07492beca1), ROM_BIOS(2) )
- ROMX_LOAD( "u36.rx11.4.02.rom", 0x1800, 0x0800, CRC(b6a239ce) SHA1(330d28fa8ec006d48d948b1c5e714ffced88fe90), ROM_BIOS(2) ) // supports low-profile keyboard, no input with the ROM present
-
- 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(3) )
- ROMX_LOAD( "v403.u34", 0x0800, 0x0800, NO_DUMP, ROM_BIOS(3) )
- ROMX_LOAD( "v403.u35", 0x1000, 0x0800, NO_DUMP, ROM_BIOS(3) )
- ROMX_LOAD( "v403.u36", 0x1800, 0x0800, NO_DUMP, ROM_BIOS(3) )
-
- 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(4) )
- ROMX_LOAD( "537p3653.u34", 0x0800, 0x0800, CRC(a9c6c0c3) SHA1(c2da9d1bf0da96e6b8bfa722783e411d2fe6deb9), ROM_BIOS(4) )
- ROMX_LOAD( "537p3654.u35", 0x1000, 0x0800, CRC(a8a07223) SHA1(e8ae1ebf2d7caf76771205f577b88ae493836ac9), ROM_BIOS(4) )
- ROMX_LOAD( "v404.u36", 0x1800, 0x0800, NO_DUMP, ROM_BIOS(4) ) // 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( "u33.5.0_537p10828.bin", 0x0000, 0x0800, CRC(a17af0f1) SHA1(b1d9a151ed4558f49b3cdc1adbf348b54da48877), ROM_BIOS(5) )
- ROMX_LOAD( "u34.5.0_537p10829.bin", 0x0800, 0x0800, CRC(c9f5182e) SHA1(ac830848614cea984c849a42687ea2944d6765d9), ROM_BIOS(5) )
- ROMX_LOAD( "u35.5.0_537p10830.bin", 0x1000, 0x0800, CRC(278fa75f) SHA1(f47cf9eb30366211280f93a8460523fcc53eebe9), ROM_BIOS(5) )
- ROMX_LOAD( "v500.u36", 0x1800, 0x0800, NO_DUMP, ROM_BIOS(5) )
-
- ROM_SYSTEM_BIOS( 6, "v50v018", "Balcones Operating System v5.0 v018" ) // shows ROM ERROR
- ROMX_LOAD( "537p10828.u33.5.0.bin", 0x0000, 0x0800, CRC(a17af0f1) SHA1(b1d9a151ed4558f49b3cdc1adbf348b54da48877), ROM_BIOS(6) )
- ROMX_LOAD( "537p10829.u34.5.0.bin", 0x0800, 0x0800, CRC(c9f5182e) SHA1(ac830848614cea984c849a42687ea2944d6765d9), ROM_BIOS(6) )
- ROMX_LOAD( "537p10830.u35.5.0.bin", 0x1000, 0x0800, BAD_DUMP CRC(cc4e1c2b) SHA1(375bbed76d9088dec82b9599cd810727d3e605f3), ROM_BIOS(6) )
- ROMX_LOAD( "537p10831.u36.5.0.bin", 0x1800, 0x0800, CRC(cda7f598) SHA1(08ffd18959e1708136076c82486b8d121a04fa23), ROM_BIOS(6) )
-
- ROM_REGION( 0x1000, "chargen", 0 )
-
- ROMX_LOAD( "x820ii.u57", 0x0000, 0x0800, CRC(1a50f600) SHA1(df4470c80611c14fa7ea8591f741fbbecdfe4fd9), ROM_BIOS(0) )
- ROMX_LOAD( "x820ii.u58", 0x0800, 0x0800, CRC(aca4b9b3) SHA1(77f41470b0151945b8d3c3a935fc66409e9157b3), ROM_BIOS(0) )
-
- ROMX_LOAD( "x820ii.u57", 0x0000, 0x0800, CRC(1a50f600) SHA1(df4470c80611c14fa7ea8591f741fbbecdfe4fd9), ROM_BIOS(1) )
- ROMX_LOAD( "x820ii.u58", 0x0800, 0x0800, CRC(aca4b9b3) SHA1(77f41470b0151945b8d3c3a935fc66409e9157b3), ROM_BIOS(1) )
-
- ROMX_LOAD( "u57.04.north.rom", 0x0000, 0x0800, CRC(eda727a2) SHA1(292cd8a0dc6699c3a2091b20c0fc63d97a266fbf), ROM_BIOS(2) )
- ROMX_LOAD( "u58.03.north.rom", 0x0800, 0x0800, CRC(a2e514f3) SHA1(8ac22dd0cf0324a857718adf67b41912864893a3), ROM_BIOS(2) )
-
- ROMX_LOAD( "x820ii.u57", 0x0000, 0x0800, CRC(1a50f600) SHA1(df4470c80611c14fa7ea8591f741fbbecdfe4fd9), ROM_BIOS(3) )
- ROMX_LOAD( "x820ii.u58", 0x0800, 0x0800, CRC(aca4b9b3) SHA1(77f41470b0151945b8d3c3a935fc66409e9157b3), ROM_BIOS(3) )
-
- ROMX_LOAD( "x820ii.u57", 0x0000, 0x0800, CRC(1a50f600) SHA1(df4470c80611c14fa7ea8591f741fbbecdfe4fd9), ROM_BIOS(4) )
- ROMX_LOAD( "x820ii.u58", 0x0800, 0x0800, CRC(aca4b9b3) SHA1(77f41470b0151945b8d3c3a935fc66409e9157b3), ROM_BIOS(4) )
-
- ROMX_LOAD( "x820ii.u57", 0x0000, 0x0800, CRC(1a50f600) SHA1(df4470c80611c14fa7ea8591f741fbbecdfe4fd9), ROM_BIOS(5) )
- ROMX_LOAD( "x820ii.u58", 0x0800, 0x0800, CRC(aca4b9b3) SHA1(77f41470b0151945b8d3c3a935fc66409e9157b3), ROM_BIOS(5) )
-
- ROMX_LOAD( "x820ii.u57", 0x0000, 0x0800, CRC(1a50f600) SHA1(df4470c80611c14fa7ea8591f741fbbecdfe4fd9), ROM_BIOS(6) )
- ROMX_LOAD( "x820ii.u58", 0x0800, 0x0800, CRC(aca4b9b3) SHA1(77f41470b0151945b8d3c3a935fc66409e9157b3), ROM_BIOS(6) )
-
-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(0) )
- ROMX_LOAD( "537p3653.u34", 0x0800, 0x0800, CRC(a9c6c0c3) SHA1(c2da9d1bf0da96e6b8bfa722783e411d2fe6deb9), ROM_BIOS(0) )
- ROMX_LOAD( "537p3654.u35", 0x1000, 0x0800, CRC(a8a07223) SHA1(e8ae1ebf2d7caf76771205f577b88ae493836ac9), ROM_BIOS(0) )
- ROMX_LOAD( "v404.u36", 0x1800, 0x0800, NO_DUMP, ROM_BIOS(0) ) // 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( "l5.u33.rom", 0x0000, 0x0800, CRC(a17af0f1) SHA1(b1d9a151ed4558f49b3cdc1adbf348b54da48877), ROM_BIOS(1) )
- ROMX_LOAD( "l5.u34.rom", 0x0800, 0x0800, CRC(c9f5182e) SHA1(ac830848614cea984c849a42687ea2944d6765d9), ROM_BIOS(1) )
- ROMX_LOAD( "l5.u35.rom", 0x1000, 0x0800, BAD_DUMP CRC(44c8dbf8) SHA1(cba925b425a7a5ca68dc9fed10ea33e100704bf4), ROM_BIOS(1) ) // shows ROM ERROR and is different from Xerox 820-II v50
- ROMX_LOAD( "u36.rx024.rom", 0x1800, 0x0800, CRC(a7f1d677) SHA1(8c2a442f3a691f2e181a640d65f767ce3b51d711), ROM_BIOS(1) ) // 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 )
- ROMX_LOAD( "x820ii.u57", 0x0000, 0x0800, CRC(1a50f600) SHA1(df4470c80611c14fa7ea8591f741fbbecdfe4fd9), ROM_BIOS(0) )
- ROMX_LOAD( "x820ii.u58", 0x0800, 0x0800, CRC(aca4b9b3) SHA1(77f41470b0151945b8d3c3a935fc66409e9157b3), ROM_BIOS(0) )
-
- ROMX_LOAD( "u57.04.north.rom", 0x0000, 0x0800, CRC(eda727a2) SHA1(292cd8a0dc6699c3a2091b20c0fc63d97a266fbf), ROM_BIOS(1) )
- ROMX_LOAD( "u58.03.north.rom", 0x0800, 0x0800, CRC(a2e514f3) SHA1(8ac22dd0cf0324a857718adf67b41912864893a3), ROM_BIOS(1) )
-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 CLASS INIT COMPANY FULLNAME FLAGS
-COMP( 1980, bigboard, 0, 0, bigboard, xerox820, bigboard_state, empty_init, "Digital Research Computers", "Big Board", 0 )
-COMP( 1981, x820, bigboard, 0, xerox820, xerox820, xerox820_state, empty_init, "Xerox", "Xerox 820", MACHINE_NO_SOUND_HW )
-COMP( 1982, mk82, bigboard, 0, bigboard, xerox820, bigboard_state, empty_init, "Scomar", "MK-82", 0 )
-COMP( 1983, x820ii, 0, 0, xerox820ii, xerox820, xerox820ii_state, empty_init, "Xerox", "Xerox 820-II", MACHINE_NOT_WORKING )
-COMP( 1983, x168, x820ii, 0, xerox168, xerox820, xerox820ii_state, empty_init, "Xerox", "Xerox 16/8", MACHINE_NOT_WORKING )
-COMP( 1983, mk83, x820ii, 0, mk83, xerox820, xerox820_state, empty_init, "Scomar", "MK-83", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW )