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path: root/src/mame/drivers/hp95lx.cpp
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// license:BSD-3-Clause
// copyright-holders:Sergey Svishchev
/***************************************************************************

    Hewlett-Packard 95LX palmtop, code name Jaguar.

    NEC V20 CPU @ 5.37 MHz
    HP F1000-80054 "Hopper" ASIC
        Display controller
        Keyboard controler
        UART
        Interrupt controller (8259 core)
        Interval timer (8254 core)
        Real time clock
        PCMCIA 1.0 controller
        ADC (4 channels; used to measure battery voltages)
        DAC (1 channel; can be used as tone generator)
    512KB or 1MB of RAM
    1MB of BIOS ROM (banked)
        P/N 18-5301 ABD \\ HN62318BFC26
    LCD, 240x128 pixels (40x16 chars in MDA-compatible text mode)

    To do:
    - blue on green LCD palette
    - native keyboard
    - 1MB model
    - identify RTC core
    - everything else

    Technical info:
    - http://web.archive.org/web/20071012040320/http://www.daniel-hertrich.de/download/95lx_devguide.zip
    - http://cd.textfiles.com/blackphilesii/PHILES/HP95/HP95DEV.ZIP

    Useful links:
    - https://hermocom.com/hplx/view-all-hp-palmtop-articles/41-95lx
    - ftp://netflora.demon.co.uk/main/TEXT/hp95lxfaq.txt
    - https://www.finseth.com/hpdata/hp95lx.php
        has keyboard layout
    - http://cfile3.uf.tistory.com/attach/152BF03E50054B2925840F
        Explorer's Guide to the HP 95LX
    - http://www.palmtoppaper.com/ptphtml/12/pt120055.htm
        Evolution of the HP Palmtops
    - http://web.archive.org/web/20150423014908/http://www.sp.uconn.edu/~mchem1/HPLX.shtml
        HPLX-L mailing list archive

    Software:
    - http://www.retroisle.com/others/hp95lx/software.php
    - http://www.mizj.com/
    - http://www.hp200lx.net/
    - http://www.nic.funet.fi/index/misc/hp95lx/Index
    - http://cd.textfiles.com/blackphilesii/PHILES/HP95/

***************************************************************************/


#include "emu.h"

#include "machine/nvram.h"
#include "machine/pic8259.h"
#include "machine/pit8253.h"
#include "bus/isa/isa.h"
#include "bus/isa/isa_cards.h"
#include "bus/pc_kbd/keyboards.h"
#include "bus/pc_kbd/pc_kbdc.h"
#include "cpu/nec/nec.h"
#include "machine/bankdev.h"
#include "machine/ram.h"

#include "screen.h"
#include "emupal.h"
#include "softlist.h"


//#define LOG_GENERAL (1U <<  0) //defined in logmacro.h already
#define LOG_KEYBOARD  (1U <<  1)
#define LOG_DEBUG     (1U <<  2)

#define VERBOSE (LOG_DEBUG)
//#define LOG_OUTPUT_FUNC printf
#include "logmacro.h"

#define LOGKBD(...) LOGMASKED(LOG_KEYBOARD, __VA_ARGS__)
#define LOGDBG(...) LOGMASKED(LOG_DEBUG, __VA_ARGS__)

#define KBDC_TAG "pc_kbdc"


class hp95lx_state : public driver_device
{
public:
	hp95lx_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_bankdev_c000(*this, "bankdev_c000")
		, m_bankdev_d000(*this, "bankdev_d000")
		, m_bankdev_e000(*this, "bankdev_e000")
		, m_bankdev_e400(*this, "bankdev_e400")
		, m_bankdev_e800(*this, "bankdev_e800")
		, m_bankdev_ec00(*this, "bankdev_ec00")
		, m_ram(*this, RAM_TAG)
		, m_nvram2(*this, "nvram2")
		, m_nvram3(*this, "nvram3")
		, m_isabus(*this, "isa")
		, m_pic8259(*this, "pic8259")
		, m_pit8254(*this, "pit8254")
		, m_screen(*this, "screen")
		, m_p_videoram(*this, "video")
		, m_p_chargen(*this, "gfx1")
	{ }

	DECLARE_WRITE8_MEMBER(d300_w);
	DECLARE_READ8_MEMBER(d300_r);
	DECLARE_WRITE8_MEMBER(e300_w);
	DECLARE_READ8_MEMBER(e300_r);
	DECLARE_WRITE8_MEMBER(f300_w);
	DECLARE_READ8_MEMBER(f300_r);

	void hp95lx(machine_config &config);
protected:
	virtual void machine_start() override;
	virtual void machine_reset() override;

	required_device<cpu_device> m_maincpu;
	required_device<address_map_bank_device> m_bankdev_c000;
	required_device<address_map_bank_device> m_bankdev_d000;
	required_device<address_map_bank_device> m_bankdev_e000;
	required_device<address_map_bank_device> m_bankdev_e400;
	required_device<address_map_bank_device> m_bankdev_e800;
	required_device<address_map_bank_device> m_bankdev_ec00;
	required_device<ram_device> m_ram;
	required_device<nvram_device> m_nvram2;
	optional_device<nvram_device> m_nvram3;
	required_device<isa8_device> m_isabus;
	required_device<pic8259_device> m_pic8259;
	required_device<pit8254_device> m_pit8254;
	required_device<screen_device> m_screen;

private:
	void hp95lx_palette(palette_device &palette) const;

	DECLARE_WRITE_LINE_MEMBER(keyboard_clock_w);
	DECLARE_WRITE_LINE_MEMBER(keyboard_data_w);
	DECLARE_READ8_MEMBER(keyboard_r);
	DECLARE_WRITE8_MEMBER(keyboard_w);
	DECLARE_READ8_MEMBER(video_r);
	DECLARE_WRITE8_MEMBER(video_w);
	DECLARE_WRITE8_MEMBER(video_address_w);
	DECLARE_READ8_MEMBER(video_register_r);
	DECLARE_WRITE8_MEMBER(video_register_w);
	DECLARE_WRITE8_MEMBER(debug_w);

	void hp95lx_io(address_map &map);
	void hp95lx_map(address_map &map);
	void hp95lx_romdos(address_map &map);

	required_shared_ptr<u8> m_p_videoram;
	required_region_ptr<u8> m_p_chargen;

	uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);

	u8 m_mapper[32], m_rtcram[2];

	// crtc
	u8 m_crtc[64], m_cursor_start_ras;
	u16 m_disp_start_addr, m_cursor_addr, m_window_start_addr;
	int m_register_address_latch;
	bool m_graphics_mode;

	// from pt68k4.cpp
	bool m_kclk;
	uint8_t m_kdata;
	uint8_t m_scancode;
	uint8_t m_kbdflag;
	int m_kbit;
};


void hp95lx_state::hp95lx_palette(palette_device &palette) const
{
	palette.set_pen_color(0, 0xa0, 0xa8, 0xa0);
	palette.set_pen_color(1, 0x30, 0x38, 0x10);
}

uint32_t hp95lx_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	int x, y, offset;
	uint16_t gfx, *p;
	uint8_t chr, attr;

	if (m_graphics_mode)
	{
		for (y = 0; y < 128; y++)
		{
			p = &bitmap.pix16(y);
			offset = y * (240 / 8);

			for (x = offset; x < offset + (240 / 8); x++)
			{
				gfx = m_p_videoram[x];

				for (int i = 7; i >= 0; i--)
				{
					*p++ = BIT(gfx, i);
				}
			}
		}
	}
	else
	{
		bool blink((m_screen->frame_number() % 10) > 4);

		// screen memory is normal MDA 80x25, but only a scrollable 40x16 window is displayed
		for (y = 0; y < 128; y++)
		{
			p = &bitmap.pix16(y);
			offset = (y / 8) * 160 + m_window_start_addr;

			for (x = offset; x < offset + 80; x += 2)
			{
				chr = m_p_videoram[x];
				attr = m_p_videoram[x + 1];

				gfx = m_p_chargen[(chr)*8 + (y % 8)];

				if ((x >> 1) == m_cursor_addr && blink && (y % 8) >= m_cursor_start_ras)
				{
					gfx = 0xff;
				}

				switch (attr)
				{
				case 0x00:
					gfx = 0;
					break;

				case 0x01:
					if (y % 8 == 7) gfx = 0xff;
					break;

				case 0x70:
					gfx ^= 0xff;
					break;
				}

				for (int i = 5; i >= 0; i--)
				{
					*p++ = BIT(gfx, i);
				}
			}
		}
	}

	return 0;
}


void hp95lx_state::machine_start()
{
	save_item(NAME(m_mapper));
	save_item(NAME(m_rtcram));
	save_item(NAME(m_crtc));
	save_item(NAME(m_graphics_mode));

	//
	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));

	memcpy(m_p_chargen, memregion("romdos")->base() + 0xffa6e, 0x0400);
	memcpy(m_p_chargen + 0x0400, memregion("romdos")->base() + 0xfb200, 0x0400);
}

void hp95lx_state::machine_reset()
{
	std::fill(std::begin(m_mapper), std::end(m_mapper), 0);
	std::fill(std::begin(m_rtcram), std::end(m_rtcram), 0);

	std::fill(std::begin(m_crtc), std::end(m_crtc), 0);
	m_graphics_mode = false;
	m_cursor_start_ras = 7;
	m_disp_start_addr = 0;
	m_cursor_addr = 0;

	m_kclk = true;
	m_kbit = 0;
	m_scancode = 0;
	m_kbdflag = 0;
}


WRITE8_MEMBER(hp95lx_state::d300_w)
{
	LOG("%s: IO %04x <- %02x\n", machine().describe_context(), 0xd300 + offset, data);

	switch (offset)
	{
	case 0:
		m_window_start_addr = ((data & 0xff) << 0) | (m_window_start_addr & 0xff00);
		break;
	case 1:
		m_window_start_addr = ((data & 0x3f) << 8) | (m_window_start_addr & 0x00ff);
		break;

	case 2:
		m_graphics_mode = !BIT(data, 4);
		break;

	case 6:
	case 7:
		m_rtcram[offset - 6] = data;
		break;
	}
}

READ8_MEMBER(hp95lx_state::d300_r)
{
	uint8_t data = 0;

	switch (offset)
	{
	case 0:
		data = m_window_start_addr;
		break;

	case 1:
		data = m_window_start_addr >> 8;
		break;

	case 5:
		data = 0x2;
		break;

	case 6:
	case 7:
		data = m_rtcram[offset - 6];
		break;
	}

	LOG("%s: IO %04x == %02x\n", machine().describe_context(), 0xd300 + offset, data);

	return data;
}

WRITE8_MEMBER(hp95lx_state::e300_w)
{
	LOG("%s: IO %04x <- %02x\n", machine().describe_context(), 0xe300 + offset, data);

	switch (offset)
	{
	case 1: // b1 = 'IR interrupt enable' (per IR.DOC)
		break;

	case 2: // interrupt control (per snd.c), 0: disable all, 127: enable all
		break;

	case 5: // DAC out (per snd.c)
		break;

	case 9: // b1 = 'a2d power' (per snd.c)
		break;

	case 10: // IRFMAT register (per IR.DOC)
		break;

	case 11: // IR transmit/receive register (per IR.DOC)
		break;

	case 13: // reset?
		break;

	case 14: // keyboard output?
	case 15:
		break;
	}
}

READ8_MEMBER(hp95lx_state::e300_r)
{
	uint8_t data = 0;

	switch (offset)
	{
	case 2: // b6 = low battery? (FD97Eh)
		break;

	case 4: // Card Detect Register (per chap5.txt)
		data = 0x50; // memory card inserted
		break;

	case 7:
		data = 0x20;
		break;

	case 9: // FF889h.  b0 = ADC ready? (per snd2.c)
		break;

	case 10: // IRFMAT register (per IR.DOC)
		break;

	case 11: // IR transmit/receive register (per IR.DOC)
		break;

	case 14: // keyboard status?
	case 15:
		return data;
		break;
	}

	LOG("%s: IO %04x == %02x\n", machine().describe_context(), 0xe300 + offset, data);

	return data;
}

WRITE8_MEMBER(hp95lx_state::f300_w)
{
	address_map_bank_device *mapper;
	const char *mapname;

	LOG("%s: IO %04x <- %02x\n", machine().describe_context(), 0xf300 + offset, data);

	if (offset >= sizeof(m_mapper)) return;

	m_mapper[offset] = data;

	switch (offset)
	{
	case 0x11: // E0000 16K
		mapper = m_bankdev_e000;
		mapname = "E0000";
		break;

	case 0x13: // E4000 16K
		mapper = m_bankdev_e400;
		mapname = "E4000";
		break;

	case 0x15: // E8000 16K
		mapper = m_bankdev_e800;
		mapname = "E8000";
		break;

	case 0x17: // EC000 16K
		mapper = m_bankdev_ec00;
		mapname = "EC000";
		break;

	case 0x18: // C0000 64K
		mapper = m_bankdev_c000;
		mapname = "C0000";
		break;

	case 0x19: // D0000 64K
		mapper = m_bankdev_d000;
		mapname = "D0000";
		break;

	default:
		LOG("MAPPER %02x unknown\n", offset);
		return;
	}

	switch (offset)
	{
	case 0x11: case 0x13: case 0x15: case 0x17:
		switch (data)
		{
		case 0: // internal
			if (m_mapper[offset - 1])
			{
				LOG("MAPPER %s <- %05X\n", mapname, (m_mapper[offset - 1] & 127) * 0x2000);
				mapper->set_bank((m_mapper[offset - 1] >> 1) & 63);
			}
			break;

		case 1: // unknown
		case 2:
			break;

		case 4: // card slot
			LOG("MAPPER %s <- %06X (card)\n", mapname, (m_mapper[offset - 1]) * 0x2000);
			mapper->set_bank(0x1000 + (m_mapper[offset - 1] >> 1));
			break;

		case 7: // XXX unmap
			LOG("MAPPER %s <- unmap\n", mapname);
			mapper->set_bank(0x400);
			break;
		}
		break;

	case 0x18: case 0x19:
		switch (data & 7)
		{
		case 0:
			if ((data & 0x87) == 0x80)
			{
				LOG("MAPPER %s <- %X0000\n", mapname, (data >> 3) & 15);
				mapper->set_bank((data >> 3) & 15);
			}
			break;

		case 4: // XXX
			break;

		case 7: // XXX unmap
			LOG("MAPPER %s <- unmap\n", mapname);
			mapper->set_bank(0x40);
			break;
		}
	}
}

READ8_MEMBER(hp95lx_state::f300_r)
{
	uint8_t data = 0;

	LOG("%s: IO %04x == %02x\n", machine().describe_context(), 0xf300 + offset, data);

	return data;
}

/* keyboard HLE -- adapted from pt68k4.cpp */

READ8_MEMBER(hp95lx_state::keyboard_r)
{
	if (offset == 0)
	{
		LOGKBD("kbd: read  %02X == %02X\n", offset + 0x60, m_scancode);
		m_pic8259->ir1_w(CLEAR_LINE);
		return m_scancode;
	}
	else
		return 0;
}

WRITE8_MEMBER(hp95lx_state::keyboard_w)
{
	LOGKBD("kbd: write %02X <= %02X\n", offset + 0x60, data);
	m_pic8259->ir1_w(CLEAR_LINE);
}

WRITE_LINE_MEMBER(hp95lx_state::keyboard_clock_w)
{
	LOGKBD("kbd: KCLK: %d kbit: %d\n", state ? 1 : 0, m_kbit);

	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)
		{
			m_scancode >>= 1;
			m_scancode |= m_kdata;
			// XXX map F2..F10 to blue function keys
			if (m_scancode > 0x3B && m_scancode < 0x45) m_scancode += 0x36;
			LOGKBD("kbd: scancode %02x\n", m_scancode);
			m_kbit = 0;
			m_pic8259->ir1_w(ASSERT_LINE);
		}
		else
		{
			m_kbit++;
		}
	}

	m_kclk = (state == ASSERT_LINE) ? true : false;
}

WRITE_LINE_MEMBER(hp95lx_state::keyboard_data_w)
{
	LOGKBD("kbd: KDATA: %d\n", state ? 1 : 0);
	m_kdata = (state == ASSERT_LINE) ? 0x80 : 0x00;
}

/* video HLE */

READ8_MEMBER(hp95lx_state::video_register_r)
{
	uint8_t ret = 0;

	switch (m_register_address_latch)
	{
	case 0x0e:
		ret = (m_cursor_addr >> 8) & 0xff;
		break;

	case 0x0f:
		ret = (m_cursor_addr >> 0) & 0xff;
		break;

	/* all other registers are write only and return 0 */
	default:
		break;
	}

	return ret;
}

WRITE8_MEMBER(hp95lx_state::video_register_w)
{
	switch (m_register_address_latch)
	{
	case 0x0a:
		m_cursor_start_ras = data & 0x7f;
		break;

	case 0x0c:
		m_disp_start_addr = ((data & 0x3f) << 8) | (m_disp_start_addr & 0x00ff);
		break;

	case 0x0d:
		m_disp_start_addr = ((data & 0xff) << 0) | (m_disp_start_addr & 0xff00);
		break;

	case 0x0e:
		m_cursor_addr = ((data & 0x3f) << 8) | (m_cursor_addr & 0x00ff);
		break;

	case 0x0f:
		m_cursor_addr = ((data & 0xff) << 0) | (m_cursor_addr & 0xff00);
		m_pic8259->ir2_w(ASSERT_LINE);
		break;
	}
}

WRITE8_MEMBER(hp95lx_state::video_address_w)
{
	m_register_address_latch = data & 0x3f;
}

READ8_MEMBER(hp95lx_state::video_r)
{
	int data = 0xff;

	switch (offset)
	{
	case 1: case 3: case 5: case 7:
		data = video_register_r(space, offset);
		break;

	case 10:
		data = 0xf0; // video_status_r(offset):
		break;
	}

	return data;
}

WRITE8_MEMBER(hp95lx_state::video_w)
{
	switch (offset)
	{
	case 0: case 2: case 4: case 6:
		video_address_w(space, offset, data);
		break;

	case 1: case 3: case 5: case 7:
		video_register_w(space, offset, data);
		break;
	}
}

WRITE8_MEMBER(hp95lx_state::debug_w)
{
	LOGDBG("%11.6f %s debug: port %02X <= %02X\n", machine().time().as_double(), machine().describe_context(), offset + 0x90, data);
}


void hp95lx_state::hp95lx_romdos(address_map &map)
{
	map(0x0000000, 0x00fffff).rom().region("romdos", 0);
	map(0x4000000, 0x41fffff).ram().share("nvram3");
}

void hp95lx_state::hp95lx_map(address_map &map)
{
	map.unmap_value_high();
	map(0x00000, 0x7ffff).ram().share("nvram2");
	map(0xa0000, 0xaffff).rom().region("romdos", 0xe0000); // OS functions (DOS, COMMAND.COM)
	map(0xb0000, 0xb0fff).ram().share("video");
	map(0xc0000, 0xcffff).rw(m_bankdev_c000, FUNC(address_map_bank_device::read8), FUNC(address_map_bank_device::write8));
	map(0xd0000, 0xdffff).rw(m_bankdev_d000, FUNC(address_map_bank_device::read8), FUNC(address_map_bank_device::write8));
	map(0xe0000, 0xe3fff).rw(m_bankdev_e000, FUNC(address_map_bank_device::read8), FUNC(address_map_bank_device::write8));
	map(0xe4000, 0xe7fff).rw(m_bankdev_e400, FUNC(address_map_bank_device::read8), FUNC(address_map_bank_device::write8));
	map(0xe8000, 0xebfff).rw(m_bankdev_e800, FUNC(address_map_bank_device::read8), FUNC(address_map_bank_device::write8));
	map(0xec000, 0xeffff).rw(m_bankdev_ec00, FUNC(address_map_bank_device::read8), FUNC(address_map_bank_device::write8));
	map(0xf0000, 0xfffff).rom().region("romdos", 0xf0000); // BIOS ROM and SysMgr
}

void hp95lx_state::hp95lx_io(address_map &map)
{
	map.unmap_value_low();
	map(0x0020, 0x002f).rw("pic8259", FUNC(pic8259_device::read), FUNC(pic8259_device::write));
	map(0x0040, 0x004f).rw("pit8254", FUNC(pit8254_device::read), FUNC(pit8254_device::write));
	map(0x0060, 0x0063).rw(FUNC(hp95lx_state::keyboard_r), FUNC(hp95lx_state::keyboard_w));
//  map(0x0090, 0x009f).w(FUNC(hp95lx_state::debug_w));
	map(0x03b0, 0x03bf).rw(FUNC(hp95lx_state::video_r), FUNC(hp95lx_state::video_w));
//  map(0x0070, 0x007f) RTC
	map(0xd300, 0xd30f).rw(FUNC(hp95lx_state::d300_r), FUNC(hp95lx_state::d300_w));
	map(0xe300, 0xe30f).rw(FUNC(hp95lx_state::e300_r), FUNC(hp95lx_state::e300_w));
	map(0xf300, 0xf31f).rw(FUNC(hp95lx_state::f300_r), FUNC(hp95lx_state::f300_w));
}


void hp95lx_state::hp95lx(machine_config &config)
{
	V20(config, m_maincpu, XTAL(5'370'000));
	m_maincpu->set_addrmap(AS_PROGRAM, &hp95lx_state::hp95lx_map);
	m_maincpu->set_addrmap(AS_IO, &hp95lx_state::hp95lx_io);
	m_maincpu->set_irq_acknowledge_callback("pic8259", FUNC(pic8259_device::inta_cb));

	ADDRESS_MAP_BANK(config, "bankdev_c000").set_map(&hp95lx_state::hp95lx_romdos).set_options(ENDIANNESS_LITTLE, 8, 32, 0x10000);
	ADDRESS_MAP_BANK(config, "bankdev_d000").set_map(&hp95lx_state::hp95lx_romdos).set_options(ENDIANNESS_LITTLE, 8, 32, 0x10000);
	ADDRESS_MAP_BANK(config, "bankdev_e000").set_map(&hp95lx_state::hp95lx_romdos).set_options(ENDIANNESS_LITTLE, 8, 32, 0x4000);
	ADDRESS_MAP_BANK(config, "bankdev_e400").set_map(&hp95lx_state::hp95lx_romdos).set_options(ENDIANNESS_LITTLE, 8, 32, 0x4000);
	ADDRESS_MAP_BANK(config, "bankdev_e800").set_map(&hp95lx_state::hp95lx_romdos).set_options(ENDIANNESS_LITTLE, 8, 32, 0x4000);
	ADDRESS_MAP_BANK(config, "bankdev_ec00").set_map(&hp95lx_state::hp95lx_romdos).set_options(ENDIANNESS_LITTLE, 8, 32, 0x4000);

	PIT8254(config, m_pit8254, 0);
	m_pit8254->set_clk<0>(XTAL(14'318'181)/12); /* heartbeat IRQ */
	m_pit8254->out_handler<0>().set(m_pic8259, FUNC(pic8259_device::ir0_w));
	m_pit8254->set_clk<1>(XTAL(14'318'181)/12); /* misc IRQ */
	m_pit8254->out_handler<1>().set(m_pic8259, FUNC(pic8259_device::ir2_w));

	PIC8259(config, m_pic8259, 0);
	m_pic8259->out_int_callback().set_inputline(m_maincpu, 0);

	ISA8(config, m_isabus, 0);
	m_isabus->set_memspace("maincpu", AS_PROGRAM);
	m_isabus->set_iospace("maincpu", AS_IO);

	ISA8_SLOT(config, "board0", 0, "isa", pc_isa8_cards, "com", true);

	pc_kbdc_device &pc_kbdc(PC_KBDC(config, KBDC_TAG, 0));
	pc_kbdc.out_clock_cb().set(FUNC(hp95lx_state::keyboard_clock_w));
	pc_kbdc.out_data_cb().set(FUNC(hp95lx_state::keyboard_data_w));
	PC_KBDC_SLOT(config, "kbd", pc_xt_keyboards, STR_KBD_KEYTRONIC_PC3270).set_pc_kbdc_slot(&pc_kbdc);

	NVRAM(config, "nvram2", nvram_device::DEFAULT_ALL_0); // RAM
	NVRAM(config, "nvram3", nvram_device::DEFAULT_ALL_0); // card slot

	// XXX When the AC adapter is plugged in, the LCD refresh rate is 73.14 Hz.
	// XXX When the AC adapter is not plugged in (ie, running off of batteries) the refresh rate is 56.8 Hz.
	SCREEN(config, m_screen, SCREEN_TYPE_LCD, rgb_t::white());
	m_screen->set_screen_update(FUNC(hp95lx_state::screen_update));
	m_screen->set_raw(XTAL(5'370'000) / 2, 300, 0, 240, 180, 0, 128);
	m_screen->set_palette("palette");

	PALETTE(config, "palette", FUNC(hp95lx_state::hp95lx_palette), 2);

	RAM(config, RAM_TAG).set_default_size("512K");
}


ROM_START( hp95lx )
	ROM_REGION16_LE(0x100000, "romdos", 0)
	// Version A ... ROM BIOS Ver 2.14 ... 04/02/91
	ROM_LOAD("18-5301.abd.bin", 0, 0x100000, CRC(18121c48) SHA1(c3bfb45cbbf4f57ae67fb5659da40f371d8e5c54))

	ROM_REGION(0x800,"gfx1", ROMREGION_ERASE00)
ROM_END


//    YEAR  NAME     PARENT   COMPAT  MACHINE  INPUT  CLASS          INIT         COMPANY             FULLNAME    FLAGS
COMP( 1991, hp95lx,  0,       0,      hp95lx,  0,     hp95lx_state,  empty_init,  "Hewlett-Packard",  "HP 95LX",  MACHINE_NOT_WORKING|MACHINE_NO_SOUND )