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Diffstat (limited to 'src/mess/drivers/pt68k4.c')
-rw-r--r-- | src/mess/drivers/pt68k4.c | 491 |
1 files changed, 0 insertions, 491 deletions
diff --git a/src/mess/drivers/pt68k4.c b/src/mess/drivers/pt68k4.c deleted file mode 100644 index 4a24667e873..00000000000 --- a/src/mess/drivers/pt68k4.c +++ /dev/null @@ -1,491 +0,0 @@ -// license:BSD-3-Clause -// copyright-holders:Robbbert, 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/timekpr.h" -#include "machine/wd_fdc.h" -#include "machine/pc_fdc.h" -#include "formats/imd_dsk.h" -#include "bus/isa/isa.h" -#include "bus/isa/isa_cards.h" -#include "bus/pc_kbd/pc_kbdc.h" -#include "bus/pc_kbd/keyboards.h" -#include "sound/speaker.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) - { } - - 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 ); - -private: - virtual void machine_start(); - virtual void machine_reset(); - required_shared_ptr<UINT16> 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_t> m_wdfdc; - - void irq5_update(); - - UINT8 m_hiram[0x800]; - - bool m_kclk; - UINT8 m_kdata; - UINT8 m_scancode; - UINT8 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 SLOT_INTERFACE_START( pt68k_floppies ) - SLOT_INTERFACE( "525dd", FLOPPY_525_DD ) -SLOT_INTERFACE_END - -// 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_connector *con = machine().device<floppy_connector>(WDFDC_TAG":0"); - floppy_connector *con2 = machine().device<floppy_connector>(WDFDC_TAG":1"); - floppy_image_device *floppy = con ? con->get_device() : 0; - floppy_image_device *floppy2 = con2 ? con2->get_device() : 0; - 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(NULL); - 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; - } -} - -static ADDRESS_MAP_START(pt68k2_mem, AS_PROGRAM, 16, pt68k4_state) - ADDRESS_MAP_UNMAP_HIGH - AM_RANGE(0x000000, 0x0fffff) AM_RAM AM_SHARE("rambase") // 1MB RAM - AM_RANGE(0xf80000, 0xf8ffff) AM_ROM AM_REGION("roms", 0) - AM_RANGE(0xc00000, 0xdfffff) AM_DEVREADWRITE8(ISABUS_TAG, isa8_device, prog_r, prog_w, 0x00ff) - AM_RANGE(0xfa0000, 0xfbffff) AM_DEVREADWRITE8(ISABUS_TAG, isa8_device, io_r, io_w, 0x00ff) - AM_RANGE(0xfe0000, 0xfe001f) AM_DEVREADWRITE8(DUART1_TAG, mc68681_device, read, write, 0x00ff) - AM_RANGE(0xfe0040, 0xfe005f) AM_DEVREADWRITE8(DUART2_TAG, mc68681_device, read, write, 0x00ff) - AM_RANGE(0xfe0080, 0xfe00bf) AM_READ8(pia_stub_r, 0x00ff) - AM_RANGE(0xfe00c0, 0xfe00ff) AM_WRITE8(fdc_select_w, 0x00ff) - AM_RANGE(0xfe0100, 0xfe013f) AM_DEVREADWRITE8(WDFDC_TAG, wd1772_t, read, write, 0x00ff) - AM_RANGE(0xfe01c0, 0xfe01c3) AM_READWRITE8(keyboard_r, keyboard_w, 0x00ff) - AM_RANGE(0xff0000, 0xff0fff) AM_READWRITE8(hiram_r, hiram_w, 0xff00) - AM_RANGE(0xff0000, 0xff0fff) AM_DEVREADWRITE8(TIMEKEEPER_TAG, timekeeper_device, read, write, 0x00ff) -ADDRESS_MAP_END - -static ADDRESS_MAP_START(pt68k4_mem, AS_PROGRAM, 16, pt68k4_state) - ADDRESS_MAP_UNMAP_HIGH - AM_RANGE(0x000000, 0x0fffff) AM_RAM AM_SHARE("rambase") // 1MB RAM (OS9 needs more) - AM_RANGE(0xf80000, 0xf8ffff) AM_ROM AM_REGION("roms", 0) - AM_RANGE(0xc00000, 0xdfffff) AM_DEVREADWRITE8(ISABUS_TAG, isa8_device, prog_r, prog_w, 0x00ff) - AM_RANGE(0xfa0000, 0xfbffff) AM_DEVREADWRITE8(ISABUS_TAG, isa8_device, io_r, io_w, 0x00ff) - AM_RANGE(0xfe0000, 0xfe001f) AM_DEVREADWRITE8(DUART1_TAG, mc68681_device, read, write, 0x00ff) - AM_RANGE(0xfe0040, 0xfe005f) AM_DEVREADWRITE8(DUART2_TAG, mc68681_device, read, write, 0x00ff) - AM_RANGE(0xfe01c0, 0xfe01c3) AM_READWRITE8(keyboard_r, keyboard_w, 0x00ff) - AM_RANGE(0xff0000, 0xff0fff) AM_READWRITE8(hiram_r, hiram_w, 0xff00) - AM_RANGE(0xff0000, 0xff0fff) AM_DEVREADWRITE8(TIMEKEEPER_TAG, timekeeper_device, read, write, 0x00ff) -ADDRESS_MAP_END - -/* 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 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* user1 = memregion("roms")->base(); - memcpy((UINT8*)m_p_base.target(), user1, 8); - - m_maincpu->reset(); - - 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_connector *con = machine().device<floppy_connector>(WDFDC_TAG":0"); - floppy_image_device *floppy = con ? con->get_device() : 0; - - 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 -SLOT_INTERFACE_START( pt68k4_isa8_cards ) - SLOT_INTERFACE("mda", ISA8_MDA) - SLOT_INTERFACE("cga", ISA8_CGA) - SLOT_INTERFACE("ega", ISA8_EGA) // Monk only - SLOT_INTERFACE("vga", ISA8_VGA) // Monk only - SLOT_INTERFACE("fdc_at", ISA8_FDC_AT) - SLOT_INTERFACE("wdxt_gen", ISA8_WDXT_GEN) - SLOT_INTERFACE("lpt", ISA8_LPT) - SLOT_INTERFACE("xtide", ISA8_XTIDE) // Monk only -SLOT_INTERFACE_END - -static MACHINE_CONFIG_START( pt68k2, pt68k4_state ) - /* basic machine hardware */ - MCFG_CPU_ADD(M68K_TAG, M68000, XTAL_16MHz/2) // 68k2 came in 8, 10, and 12 MHz versions - MCFG_CPU_PROGRAM_MAP(pt68k2_mem) - - MCFG_MC68681_ADD("duart1", XTAL_3_6864MHz) - MCFG_MC68681_IRQ_CALLBACK(WRITELINE(pt68k4_state, duart1_irq)) - MCFG_MC68681_OUTPORT_CALLBACK(WRITE8(pt68k4_state, duart1_out)) - - MCFG_MC68681_ADD("duart2", XTAL_3_6864MHz) - - MCFG_DEVICE_ADD(KBDC_TAG, PC_KBDC, 0) - MCFG_PC_KBDC_OUT_CLOCK_CB(WRITELINE(pt68k4_state, keyboard_clock_w)) - MCFG_PC_KBDC_OUT_DATA_CB(WRITELINE(pt68k4_state, keyboard_data_w)) - MCFG_PC_KBDC_SLOT_ADD(KBDC_TAG, "kbd", pc_xt_keyboards, STR_KBD_IBM_PC_XT_83) - - MCFG_M48T02_ADD(TIMEKEEPER_TAG) - - MCFG_WD1772_ADD(WDFDC_TAG, XTAL_16MHz / 2) - MCFG_FLOPPY_DRIVE_ADD(WDFDC_TAG":0", pt68k_floppies, "525dd", pt68k4_state::floppy_formats) - MCFG_FLOPPY_DRIVE_ADD(WDFDC_TAG":1", pt68k_floppies, "525dd", pt68k4_state::floppy_formats) - - MCFG_DEVICE_ADD(ISABUS_TAG, ISA8, 0) - MCFG_ISA8_CPU(":" M68K_TAG) - MCFG_ISA8_BUS_CUSTOM_SPACES() - MCFG_ISA_OUT_IRQ5_CB(WRITELINE(pt68k4_state, irq5_w)) - MCFG_ISA8_SLOT_ADD(ISABUS_TAG, "isa1", pt68k4_isa8_cards, "cga", false) - MCFG_ISA8_SLOT_ADD(ISABUS_TAG, "isa2", pt68k4_isa8_cards, NULL, false) - MCFG_ISA8_SLOT_ADD(ISABUS_TAG, "isa3", pt68k4_isa8_cards, NULL, false) - MCFG_ISA8_SLOT_ADD(ISABUS_TAG, "isa4", pt68k4_isa8_cards, NULL, false) - MCFG_ISA8_SLOT_ADD(ISABUS_TAG, "isa5", pt68k4_isa8_cards, NULL, false) - MCFG_ISA8_SLOT_ADD(ISABUS_TAG, "isa6", pt68k4_isa8_cards, NULL, false) - - MCFG_SPEAKER_STANDARD_MONO("mono") - MCFG_SOUND_ADD(SPEAKER_TAG, SPEAKER_SOUND, 0) - MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00) - - MCFG_SOFTWARE_LIST_ADD("flop525_list", "pt68k2") -MACHINE_CONFIG_END - -static MACHINE_CONFIG_START( pt68k4, pt68k4_state ) - /* basic machine hardware */ - MCFG_CPU_ADD(M68K_TAG, M68000, XTAL_16MHz) - MCFG_CPU_PROGRAM_MAP(pt68k4_mem) - - // add the DUARTS. first one has the console on channel A at 19200. - MCFG_MC68681_ADD("duart1", XTAL_16MHz / 4) - MCFG_MC68681_IRQ_CALLBACK(WRITELINE(pt68k4_state, duart1_irq)) - MCFG_MC68681_OUTPORT_CALLBACK(WRITE8(pt68k4_state, duart1_out)) - - MCFG_MC68681_ADD("duart2", XTAL_16MHz / 4) - - MCFG_DEVICE_ADD(KBDC_TAG, PC_KBDC, 0) - MCFG_PC_KBDC_OUT_CLOCK_CB(WRITELINE(pt68k4_state, keyboard_clock_w)) - MCFG_PC_KBDC_OUT_DATA_CB(WRITELINE(pt68k4_state, keyboard_data_w)) - MCFG_PC_KBDC_SLOT_ADD(KBDC_TAG, "kbd", pc_xt_keyboards, STR_KBD_IBM_PC_XT_83) - - MCFG_M48T02_ADD(TIMEKEEPER_TAG) - - MCFG_DEVICE_ADD(ISABUS_TAG, ISA8, 0) - MCFG_ISA8_CPU(":" M68K_TAG) - MCFG_ISA8_BUS_CUSTOM_SPACES() - MCFG_ISA8_SLOT_ADD(ISABUS_TAG, "isa1", pt68k4_isa8_cards, "fdc_at", false) - MCFG_ISA8_SLOT_ADD(ISABUS_TAG, "isa2", pt68k4_isa8_cards, "cga", false) - MCFG_ISA8_SLOT_ADD(ISABUS_TAG, "isa3", pt68k4_isa8_cards, NULL, false) - MCFG_ISA8_SLOT_ADD(ISABUS_TAG, "isa4", pt68k4_isa8_cards, NULL, false) - MCFG_ISA8_SLOT_ADD(ISABUS_TAG, "isa5", pt68k4_isa8_cards, NULL, false) - MCFG_ISA8_SLOT_ADD(ISABUS_TAG, "isa6", pt68k4_isa8_cards, NULL, false) - MCFG_ISA8_SLOT_ADD(ISABUS_TAG, "isa7", pt68k4_isa8_cards, NULL, false) - - MCFG_SPEAKER_STANDARD_MONO("mono") - MCFG_SOUND_ADD(SPEAKER_TAG, SPEAKER_SOUND, 0) - MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00) - - MCFG_SOFTWARE_LIST_ADD("flop525_list", "pt68k2") -MACHINE_CONFIG_END - -/* 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(1)) - ROMX_LOAD( "humpta41.bin", 0x0001, 0x8000, CRC(a8b16e27) SHA1(218802f6e20d14cff736bb7423f06ce2f66e074c), ROM_SKIP(1) | ROM_BIOS(1)) - ROM_SYSTEM_BIOS( 1, "monk", "Monk" ) - ROMX_LOAD( "monk_0.bin", 0x0000, 0x8000, CRC(420d6a4b) SHA1(fca8c53c9c3c8ebd09370499cf34f4cc75ed9463), ROM_SKIP(1) | ROM_BIOS(2)) - ROMX_LOAD( "monk_1.bin", 0x0001, 0x8000, CRC(fc495e82) SHA1(f7b720d87db4d72a23e6c42d2cdd03216db04b60), ROM_SKIP(1) | ROM_BIOS(2)) - - 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, driver_device, 0, "Peripheral Technology", "PT68K2", MACHINE_SUPPORTS_SAVE ) -COMP( 1990, pt68k4, 0, 0, pt68k4, pt68k4, driver_device, 0, "Peripheral Technology", "PT68K4", MACHINE_SUPPORTS_SAVE ) |