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diff --git a/src/mame/drivers/pt68k4.cpp b/src/mame/drivers/pt68k4.cpp
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-// license:BSD-3-Clause
-// copyright-holders:R. Belmont
-/***************************************************************************
-
- Peripheral Technology PT68K2/PT68K4 family
-
- 2011-01-03 Skeleton driver.
- 2013-09-30 Connected to a terminal
- 2014-01-03 Connect real DUARTs, FDC, and TimeKeeper. Settings now save properly, floppies can be read.
- 2014-01-19 ISA bus and compatible cards, PC keyboard support, speaker support
- 2014-09-20 Add PT68K2, add save states, we have a working SK*DOS disk!
-
-This has the appearance of a PC, including pc power supply, slots, etc
-on a conventional pc-like motherboard and case.
-
-Some pics: http://www.wormfood.net/old_computers/
-
-Source code and manuals for the HUMBUG BIOS and SK*DOS are at:
-http://www.users.cloud9.net/~stark/sources.html
-
-Usage:
- Start up and press Enter as prompted. Type he to see a command list, or fd to boot from the
- first floppy drive.
-
- The stock NVRAM configures PT68k2 for 2 DSDD 5.25" drives, and PT68k4 for 2 DSHD 5.25" drives.
-
-Chips:
- 68230 Parallel Interface/Timer @ FE0081
- 68681 DUART/Timer (x2) @ FE0001 and FE0041
- WD37C65 FDC (PC FDC compatible, even mapped as an ISA device)
- MK48T02 TimeKeeper @ odd bytes from FF0001 to FF0FFF. even bytes in that range are a standard SRAM chip which is not backed up.
- Keyboard at FE01C1 (status/IRQ clear)/FE01C3 (AT scan codes)
- WD1002 HDD controller @ FE0141-FE014F. "Monk" BIOS also supports an 8-bit ISA IDE card.
-
-Video: ISA MDA or CGA/EGA/VGA-style boards
- ISA memory is C00001-DFFFFF odd bytes only. So the MDA B0000 framebuffer becames (B0000*2) + C00001 = D60001.
- ISA I/O is at FA0001-FBFFFF odd bytes only, and the mapping is similar.
-
- HUMBUG BIOS tests MDA and CGA VRAM to determine existence, falls back to serial console if neither exists. If both exist, MDA is used.
- VRAM is every other byte for ISA cards. (Only 8 bit cards are supported).
-
- OP3 on DUART1 drives a speaker.
- IP2 on DUART1 signals if a new keyboard scan code is available.
-
-IRQs:
- 2: 68230 PIT
- 4: DUART2
- 5: DUART1
- 6: PC FDC IRQ
-
-TODO: 68230 device
- This system and SK*DOS don't like our ISA WDXT-GEN emulation so HDD installs are not currently possible.
-
-****************************************************************************/
-
-#include "emu.h"
-
-#include "cpu/m68000/m68000.h"
-#include "machine/mc68681.h"
-#include "machine/pc_fdc.h"
-#include "machine/timekpr.h"
-#include "machine/wd_fdc.h"
-#include "sound/spkrdev.h"
-
-#include "bus/isa/cga.h"
-#include "bus/isa/ega.h"
-#include "bus/isa/fdc.h"
-#include "bus/isa/isa.h"
-#include "bus/isa/isa_cards.h"
-#include "bus/isa/lpt.h"
-#include "bus/isa/mda.h"
-#include "bus/isa/vga.h"
-#include "bus/isa/wdxt_gen.h"
-#include "bus/isa/xtide.h"
-#include "bus/pc_kbd/keyboards.h"
-#include "bus/pc_kbd/pc_kbdc.h"
-
-#include "softlist.h"
-#include "speaker.h"
-
-#include "formats/imd_dsk.h"
-
-
-#define M68K_TAG "maincpu"
-#define DUART1_TAG "duart1"
-#define DUART2_TAG "duart2"
-#define TIMEKEEPER_TAG "timekpr"
-#define ISABUS_TAG "isa"
-#define KBDC_TAG "pc_kbdc"
-#define SPEAKER_TAG "speaker"
-#define WDFDC_TAG "wdfdc"
-
-class pt68k4_state : public driver_device
-{
-public:
- pt68k4_state(const machine_config &mconfig, device_type type, const char *tag)
- : driver_device(mconfig, type, tag)
- , m_p_base(*this, "rambase")
- , m_maincpu(*this, M68K_TAG)
- , m_duart1(*this, DUART1_TAG)
- , m_duart2(*this, DUART2_TAG)
- , m_isa(*this, ISABUS_TAG)
- , m_speaker(*this, SPEAKER_TAG)
- , m_wdfdc(*this, WDFDC_TAG)
- , m_floppy_connector(*this, WDFDC_TAG":%u", 0U)
- { }
-
- void pt68k2(machine_config &config);
- void pt68k4(machine_config &config);
-
-private:
- DECLARE_READ8_MEMBER(hiram_r);
- DECLARE_WRITE8_MEMBER(hiram_w);
- DECLARE_READ8_MEMBER(keyboard_r);
- DECLARE_WRITE8_MEMBER(keyboard_w);
-
- DECLARE_READ8_MEMBER(pia_stub_r);
- DECLARE_WRITE8_MEMBER(duart1_out);
-
- DECLARE_WRITE8_MEMBER(fdc_select_w);
-
- DECLARE_WRITE_LINE_MEMBER(duart1_irq);
- DECLARE_WRITE_LINE_MEMBER(duart2_irq);
-
- DECLARE_WRITE_LINE_MEMBER(irq5_w);
-
- DECLARE_WRITE_LINE_MEMBER(keyboard_clock_w);
- DECLARE_WRITE_LINE_MEMBER(keyboard_data_w);
-
- DECLARE_FLOPPY_FORMATS( floppy_formats );
-
- void pt68k2_mem(address_map &map);
- void pt68k4_mem(address_map &map);
-
- virtual void machine_start() override;
- virtual void machine_reset() override;
- required_shared_ptr<uint16_t> m_p_base;
- required_device<cpu_device> m_maincpu;
- required_device<mc68681_device> m_duart1;
- required_device<mc68681_device> m_duart2;
- required_device<isa8_device> m_isa;
- required_device<speaker_sound_device> m_speaker;
- optional_device<wd1772_device> m_wdfdc;
- optional_device_array<floppy_connector, 2> m_floppy_connector;
-
- void irq5_update();
-
- uint8_t m_hiram[0x800];
-
- bool m_kclk;
- uint8_t m_kdata;
- uint8_t m_scancode;
- uint8_t m_kbdflag;
- int m_kbit;
- int m_lastdrive;
- bool m_irq5_duart1, m_irq5_isa;
-};
-
-FLOPPY_FORMATS_MEMBER( pt68k4_state::floppy_formats )
- FLOPPY_IMD_FORMAT
-FLOPPY_FORMATS_END
-
-static void pt68k_floppies(device_slot_interface &device)
-{
- device.option_add("525dd", FLOPPY_525_DD);
-}
-
-// XT keyboard interface - done in TTL instead of an 804x
-WRITE_LINE_MEMBER(pt68k4_state::keyboard_clock_w)
-{
-// printf("KCLK: %d\n", state ? 1 : 0);
-
- // rising edge?
- if ((state == ASSERT_LINE) && (!m_kclk))
- {
- if (m_kbit >= 1 && m_kbit <= 8)
- {
- m_scancode >>= 1;
- m_scancode |= m_kdata;
- }
-
- // stop bit?
- if (m_kbit == 9)
- {
-// printf("scancode %02x\n", m_scancode);
- m_kbit = 0;
- m_kbdflag = 0x80;
- m_duart1->ip2_w(CLEAR_LINE);
- }
- else
- {
- m_kbit++;
- }
- }
-
- m_kclk = (state == ASSERT_LINE) ? true : false;
-}
-
-WRITE_LINE_MEMBER(pt68k4_state::keyboard_data_w)
-{
-// printf("KDATA: %d\n", state ? 1 : 0);
- m_kdata = (state == ASSERT_LINE) ? 0x80 : 0x00;
-}
-
-WRITE8_MEMBER(pt68k4_state::duart1_out)
-{
- m_speaker->level_w((data >> 3) & 1);
-}
-
-READ8_MEMBER(pt68k4_state::pia_stub_r)
-{
- return 0;
-}
-
-WRITE8_MEMBER(pt68k4_state::fdc_select_w)
-{
- floppy_image_device *floppy = m_floppy_connector[0] ? m_floppy_connector[0]->get_device() : nullptr;
- floppy_image_device *floppy2 = m_floppy_connector[1] ? m_floppy_connector[1]->get_device() : nullptr;
- int drive = data & 3;
-
- if (drive != m_lastdrive)
- {
- switch (drive)
- {
- case 0:
- m_wdfdc->set_floppy(floppy);
- break;
-
- case 1:
- m_wdfdc->set_floppy(floppy2);
- break;
-
- default:
- m_wdfdc->set_floppy(nullptr);
- break;
- }
-
- m_lastdrive = drive;
- }
-
- switch (drive)
- {
- case 0:
- floppy->ss_w((data & 0x40) ? 1 : 0);
- break;
-
- case 1:
- floppy2->ss_w((data & 0x40) ? 1 : 0);
- break;
-
- default:
- break;
- }
-}
-
-void pt68k4_state::pt68k2_mem(address_map &map)
-{
- map.unmap_value_high();
- map(0x000000, 0x0fffff).ram().share("rambase"); // 1MB RAM
- map(0xf80000, 0xf8ffff).rom().region("roms", 0);
- map(0xc00000, 0xdfffff).rw(m_isa, FUNC(isa8_device::mem_r), FUNC(isa8_device::mem_w)).umask16(0x00ff);
- map(0xfa0000, 0xfbffff).rw(m_isa, FUNC(isa8_device::io_r), FUNC(isa8_device::io_w)).umask16(0x00ff);
- map(0xfe0000, 0xfe001f).rw(m_duart1, FUNC(mc68681_device::read), FUNC(mc68681_device::write)).umask16(0x00ff);
- map(0xfe0040, 0xfe005f).rw(m_duart2, FUNC(mc68681_device::read), FUNC(mc68681_device::write)).umask16(0x00ff);
- map(0xfe0080, 0xfe00bf).r(FUNC(pt68k4_state::pia_stub_r)).umask16(0x00ff);
- map(0xfe00c0, 0xfe00ff).w(FUNC(pt68k4_state::fdc_select_w)).umask16(0x00ff);
- map(0xfe0100, 0xfe013f).rw(m_wdfdc, FUNC(wd1772_device::read), FUNC(wd1772_device::write)).umask16(0x00ff);
- map(0xfe01c0, 0xfe01c3).rw(FUNC(pt68k4_state::keyboard_r), FUNC(pt68k4_state::keyboard_w)).umask16(0x00ff);
- map(0xff0000, 0xff0fff).rw(FUNC(pt68k4_state::hiram_r), FUNC(pt68k4_state::hiram_w)).umask16(0xff00);
- map(0xff0000, 0xff0fff).rw(TIMEKEEPER_TAG, FUNC(timekeeper_device::read), FUNC(timekeeper_device::write)).umask16(0x00ff);
-}
-
-void pt68k4_state::pt68k4_mem(address_map &map)
-{
- map.unmap_value_high();
- map(0x000000, 0x0fffff).ram().share("rambase"); // 1MB RAM (OS9 needs more)
- map(0xf80000, 0xf8ffff).rom().region("roms", 0);
- map(0xc00000, 0xdfffff).rw(m_isa, FUNC(isa8_device::mem_r), FUNC(isa8_device::mem_w)).umask16(0x00ff);
- map(0xfa0000, 0xfbffff).rw(m_isa, FUNC(isa8_device::io_r), FUNC(isa8_device::io_w)).umask16(0x00ff);
- map(0xfe0000, 0xfe001f).rw(m_duart1, FUNC(mc68681_device::read), FUNC(mc68681_device::write)).umask16(0x00ff);
- map(0xfe0040, 0xfe005f).rw(m_duart2, FUNC(mc68681_device::read), FUNC(mc68681_device::write)).umask16(0x00ff);
- map(0xfe01c0, 0xfe01c3).rw(FUNC(pt68k4_state::keyboard_r), FUNC(pt68k4_state::keyboard_w)).umask16(0x00ff);
- map(0xff0000, 0xff0fff).rw(FUNC(pt68k4_state::hiram_r), FUNC(pt68k4_state::hiram_w)).umask16(0xff00);
- map(0xff0000, 0xff0fff).rw(TIMEKEEPER_TAG, FUNC(timekeeper_device::read), FUNC(timekeeper_device::write)).umask16(0x00ff);
-}
-
-/* Input ports */
-static INPUT_PORTS_START( pt68k4 )
-INPUT_PORTS_END
-
-/* built in keyboard: offset 0 reads 0x80 if key ready, 0 if not. If key ready, offset 1 reads scancode. Read or write to offs 0 clears key ready */
-READ8_MEMBER(pt68k4_state::keyboard_r)
-{
- if (offset == 0)
- {
- uint8_t rv = m_kbdflag;
-
- m_kbdflag = 0;
- m_duart1->ip2_w(ASSERT_LINE);
-
- return rv;
- }
-
- return m_scancode;
-}
-
-WRITE8_MEMBER(pt68k4_state::keyboard_w)
-{
- m_kbdflag = 0;
- m_duart1->ip2_w(ASSERT_LINE);
-}
-
-READ8_MEMBER(pt68k4_state::hiram_r)
-{
- return m_hiram[offset];
-}
-
-WRITE8_MEMBER(pt68k4_state::hiram_w)
-{
- m_hiram[offset] = data;
-}
-
-void pt68k4_state::machine_start()
-{
- save_item(NAME(m_hiram));
- save_item(NAME(m_kclk));
- save_item(NAME(m_kdata));
- save_item(NAME(m_scancode));
- save_item(NAME(m_kbdflag));
- save_item(NAME(m_kbit));
- save_item(NAME(m_lastdrive));
- save_item(NAME(m_irq5_duart1));
- save_item(NAME(m_irq5_isa));
-}
-
-void pt68k4_state::machine_reset()
-{
- uint8_t* user1 = memregion("roms")->base();
- memcpy((uint8_t*)m_p_base.target(), user1, 8);
-
- m_kclk = true;
- m_kbit = 0;
- m_scancode = 0;
- m_kbdflag = 0;
- m_irq5_duart1 = CLEAR_LINE;
- m_irq5_isa = CLEAR_LINE;
-
- // set line to asserted (no key code ready)
- m_duart1->ip2_w(ASSERT_LINE);
-
- if (m_wdfdc)
- {
- floppy_image_device *floppy = m_floppy_connector[0] ? m_floppy_connector[0]->get_device() : nullptr;
-
- m_wdfdc->set_floppy(floppy);
- floppy->ss_w(0);
-
- m_lastdrive = 0;
- }
-}
-
-void pt68k4_state::irq5_update()
-{
- if ((m_irq5_duart1) || (m_irq5_isa))
- {
- m_maincpu->set_input_line(M68K_IRQ_5, ASSERT_LINE);
- }
- else
- {
- m_maincpu->set_input_line(M68K_IRQ_5, CLEAR_LINE);
- }
-}
-
-WRITE_LINE_MEMBER(pt68k4_state::duart1_irq)
-{
- m_irq5_duart1 = state;
- irq5_update();
-}
-
-WRITE_LINE_MEMBER(pt68k4_state::irq5_w)
-{
- m_irq5_isa = state;
- irq5_update();
-}
-
-WRITE_LINE_MEMBER(pt68k4_state::duart2_irq)
-{
- m_maincpu->set_input_line(M68K_IRQ_4, state);
-}
-
-// these are cards supported by the HUMBUG and Monk BIOSes
-void pt68k4_isa8_cards(device_slot_interface &device)
-{
- device.option_add("mda", ISA8_MDA);
- device.option_add("cga", ISA8_CGA);
- device.option_add("ega", ISA8_EGA); // Monk only
- device.option_add("vga", ISA8_VGA); // Monk only
- device.option_add("fdc_at", ISA8_FDC_AT);
- device.option_add("wdxt_gen", ISA8_WDXT_GEN);
- device.option_add("lpt", ISA8_LPT);
- device.option_add("xtide", ISA8_XTIDE); // Monk only
-}
-
-void pt68k4_state::pt68k2(machine_config &config)
-{
- /* basic machine hardware */
- M68000(config, m_maincpu, 16_MHz_XTAL / 2); // 68k2 came in 8, 10, and 12 MHz versions
- m_maincpu->set_addrmap(AS_PROGRAM, &pt68k4_state::pt68k2_mem);
-
- MC68681(config, m_duart1, 3.6864_MHz_XTAL);
- m_duart1->irq_cb().set(FUNC(pt68k4_state::duart1_irq));
- m_duart1->outport_cb().set(FUNC(pt68k4_state::duart1_out));
-
- MC68681(config, m_duart2, 3.6864_MHz_XTAL);
-
- pc_kbdc_device &pc_kbdc(PC_KBDC(config, KBDC_TAG, 0));
- pc_kbdc.out_clock_cb().set(FUNC(pt68k4_state::keyboard_clock_w));
- pc_kbdc.out_data_cb().set(FUNC(pt68k4_state::keyboard_data_w));
- PC_KBDC_SLOT(config, "kbd", pc_xt_keyboards, STR_KBD_IBM_PC_XT_83).set_pc_kbdc_slot(&pc_kbdc);
-
- M48T02(config, TIMEKEEPER_TAG, 0);
-
- WD1772(config, m_wdfdc, 16_MHz_XTAL / 2);
- FLOPPY_CONNECTOR(config, m_floppy_connector[0], pt68k_floppies, "525dd", pt68k4_state::floppy_formats);
- FLOPPY_CONNECTOR(config, m_floppy_connector[1], pt68k_floppies, "525dd", pt68k4_state::floppy_formats);
-
- ISA8(config, m_isa, 0);
- m_isa->set_custom_spaces();
- m_isa->irq5_callback().set(FUNC(pt68k4_state::irq5_w));
-
- ISA8_SLOT(config, "isa1", 0, m_isa, pt68k4_isa8_cards, "cga", false); // FIXME: determine ISA bus clock
- ISA8_SLOT(config, "isa2", 0, m_isa, pt68k4_isa8_cards, nullptr, false);
- ISA8_SLOT(config, "isa3", 0, m_isa, pt68k4_isa8_cards, nullptr, false);
- ISA8_SLOT(config, "isa4", 0, m_isa, pt68k4_isa8_cards, nullptr, false);
- ISA8_SLOT(config, "isa5", 0, m_isa, pt68k4_isa8_cards, nullptr, false);
- ISA8_SLOT(config, "isa6", 0, m_isa, pt68k4_isa8_cards, nullptr, false),
-
- SPEAKER(config, "mono").front_center();
- SPEAKER_SOUND(config, m_speaker).add_route(ALL_OUTPUTS, "mono", 1.00);
-
- SOFTWARE_LIST(config, "flop525_list").set_original("pt68k2");
-}
-
-void pt68k4_state::pt68k4(machine_config &config)
-{
- /* basic machine hardware */
- M68000(config, m_maincpu, XTAL(16'000'000));
- m_maincpu->set_addrmap(AS_PROGRAM, &pt68k4_state::pt68k4_mem);
-
- // add the DUARTS. first one has the console on channel A at 19200.
- MC68681(config, m_duart1, XTAL(16'000'000) / 4);
- m_duart1->irq_cb().set(FUNC(pt68k4_state::duart1_irq));
- m_duart1->outport_cb().set(FUNC(pt68k4_state::duart1_out));
-
- MC68681(config, m_duart2, XTAL(16'000'000) / 4);
-
- pc_kbdc_device &pc_kbdc(PC_KBDC(config, KBDC_TAG, 0));
- pc_kbdc.out_clock_cb().set(FUNC(pt68k4_state::keyboard_clock_w));
- pc_kbdc.out_data_cb().set(FUNC(pt68k4_state::keyboard_data_w));
- PC_KBDC_SLOT(config, "kbd", pc_xt_keyboards, STR_KBD_IBM_PC_XT_83).set_pc_kbdc_slot(&pc_kbdc);
-
- M48T02(config, TIMEKEEPER_TAG, 0);
-
- ISA8(config, m_isa, 0);
- m_isa->set_custom_spaces();
-
- ISA8_SLOT(config, "isa1", 0, m_isa, pt68k4_isa8_cards, "fdc_at", false); // FIXME: determine ISA bus clock
- ISA8_SLOT(config, "isa2", 0, m_isa, pt68k4_isa8_cards, "cga", false);
- ISA8_SLOT(config, "isa3", 0, m_isa, pt68k4_isa8_cards, nullptr, false);
- ISA8_SLOT(config, "isa4", 0, m_isa, pt68k4_isa8_cards, nullptr, false);
- ISA8_SLOT(config, "isa5", 0, m_isa, pt68k4_isa8_cards, nullptr, false);
- ISA8_SLOT(config, "isa6", 0, m_isa, pt68k4_isa8_cards, nullptr, false),
- ISA8_SLOT(config, "isa7", 0, m_isa, pt68k4_isa8_cards, nullptr, false),
-
- SPEAKER(config, "mono").front_center();
- SPEAKER_SOUND(config, m_speaker).add_route(ALL_OUTPUTS, "mono", 1.00);
-
- SOFTWARE_LIST(config, "flop525_list").set_original("pt68k2");
-}
-
-/* ROM definition */
-ROM_START( pt68k2 )
- ROM_REGION16_BE( 0x10000, "roms", 0 )
- ROM_LOAD16_BYTE( "hum_u20.bin", 0x000000, 0x008000, CRC(69db483a) SHA1(9dfea73e4d7deef7c66a27cca92eb7c9ff767215) )
- ROM_LOAD16_BYTE( "hum_u27.bin", 0x000001, 0x008000, CRC(54441b06) SHA1(0e2d63b1cd01f88f37fc4859c11c252c4fea220b) )
-
- ROM_REGION(0x800, TIMEKEEPER_TAG, 0)
- ROM_LOAD( "u21_ds1220.bin", 0x000000, 0x000800, CRC(7a6b75ce) SHA1(07663860aa6cc21aed04a568ff9c05bc75d62e4f) )
-ROM_END
-
-ROM_START( pt68k4 )
- ROM_REGION16_BE( 0x10000, "roms", 0 )
- ROM_SYSTEM_BIOS( 0, "humbug", "Humbug" )
- ROMX_LOAD( "humpta40.bin", 0x0000, 0x8000, CRC(af67ff64) SHA1(da9fa31338c6847bb0e66118679b1ec01f6dc30b), ROM_SKIP(1) | ROM_BIOS(0) )
- ROMX_LOAD( "humpta41.bin", 0x0001, 0x8000, CRC(a8b16e27) SHA1(218802f6e20d14cff736bb7423f06ce2f66e074c), ROM_SKIP(1) | ROM_BIOS(0) )
- ROM_SYSTEM_BIOS( 1, "monk", "Monk" )
- ROMX_LOAD( "monk_0.bin", 0x0000, 0x8000, CRC(420d6a4b) SHA1(fca8c53c9c3c8ebd09370499cf34f4cc75ed9463), ROM_SKIP(1) | ROM_BIOS(1) )
- ROMX_LOAD( "monk_1.bin", 0x0001, 0x8000, CRC(fc495e82) SHA1(f7b720d87db4d72a23e6c42d2cdd03216db04b60), ROM_SKIP(1) | ROM_BIOS(1) )
-
- ROM_REGION(0x800, TIMEKEEPER_TAG, 0)
- ROM_LOAD( "u21_ds1220_k4.bin", 0x000000, 0x000800, CRC(753472e6) SHA1(58dc8bcc86191e4a4429fe6a9b4fdd7788abb0cd) )
-
- ROM_REGION( 0x0900, "proms", 0 )
- ROM_LOAD_OPTIONAL( "20l8.u71", 0x0000, 0x000149, CRC(77365121) SHA1(5ecf490ead119966a5c097d90740acde60462ab0) )
- ROM_LOAD_OPTIONAL( "16l8.u53", 0x0200, 0x000109, CRC(cb6a9984) SHA1(45b9b14e7b45cda6f0edfcbb9895b6a14eacb852) )
- ROM_LOAD_OPTIONAL( "22v10.u40", 0x0400, 0x0002e1, CRC(24df92e4) SHA1(c183113956bb0db132b6f37b239ca0bb7fac2d82) )
- ROM_LOAD_OPTIONAL( "16l8.u11", 0x0700, 0x000109, CRC(397a1363) SHA1(aca2a02e1bf1f7cdb9b0ca24ebecb0b01ae472e8) )
-ROM_END
-
-/* Driver */
-// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
-COMP( 1988, pt68k2, 0, 0, pt68k2, pt68k4, pt68k4_state, empty_init, "Peripheral Technology", "PT68K2", MACHINE_SUPPORTS_SAVE )
-COMP( 1990, pt68k4, 0, 0, pt68k4, pt68k4, pt68k4_state, empty_init, "Peripheral Technology", "PT68K4", MACHINE_SUPPORTS_SAVE )