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path: root/src/mame/drivers/osbexec.cpp
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// license:BSD-3-Clause
// copyright-holders:Wilbert Pol
/***************************************************************************

    Osborne Executive driver file

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

#include "emu.h"

#include "bus/rs232/rs232.h"
#include "cpu/z80/z80.h"
#include "machine/z80daisy.h"
#include "machine/6821pia.h"
#include "machine/input_merger.h"
#include "machine/pit8253.h"
#include "machine/ram.h"
#include "machine/wd_fdc.h"
#include "machine/z80sio.h"
#include "sound/spkrdev.h"

#include "screen.h"
#include "softlist.h"
#include "speaker.h"


#define MAIN_CLOCK  XTAL(23'961'600)

#define MODEM_PORT_TAG "modem"
#define PRINTER_PORT_TAG "printer"


class osbexec_state : public driver_device
{
public:
	osbexec_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_screen(*this, "screen")
		, m_mb8877(*this, "mb8877")
		, m_messram( *this, RAM_TAG)
		, m_pia_0(*this, "pia_0")
		, m_pia_1(*this, "pia_1")
		, m_sio(*this, "sio")
		, m_speaker(*this, "speaker")
		, m_floppy0(*this, "mb8877:0:525ssdd")
		, m_floppy1(*this, "mb8877:1:525ssdd")
	{ }

	required_device<cpu_device> m_maincpu;
	required_device<screen_device> m_screen;
	required_device<mb8877_device>  m_mb8877;
	required_device<ram_device> m_messram;
	required_device<pia6821_device> m_pia_0;
	required_device<pia6821_device> m_pia_1;
	required_device<z80sio_device> m_sio;
	required_device<speaker_sound_device>   m_speaker;
	required_device<floppy_image_device> m_floppy0;
	required_device<floppy_image_device> m_floppy1;

	virtual void video_start() override;

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

	bitmap_ind16 m_bitmap;

	memory_region   *m_fontram_region;
	memory_region *m_vram_region;
	uint8_t   *m_fontram;
	uint8_t   *m_vram;
	uint8_t   *m_ram_0000;
	uint8_t   *m_ram_c000;
	uint8_t   m_temp_attr;
	emu_timer *m_video_timer;

	/* PIA 0 (UD12) */
	uint8_t   m_pia0_porta;
	uint8_t   m_pia0_portb;
	int     m_pia0_cb2;         /* 60/50 */

	/* PIA 1 (UD8) */

	/* Vblank counter ("RTC") */
	uint8_t   m_rtc;

	void set_banks()
	{
		uint8_t *ram_ptr = m_messram->pointer();

		m_ram_0000 = ram_ptr;

		if ( m_pia0_porta & 0x01 )
			m_ram_0000 += 0x10000;

		membank( "0000" )->set_base( m_ram_0000 + 0x0000 );
		membank( "2000" )->set_base( m_ram_0000 + 0x2000 );
		membank( "4000" )->set_base( m_ram_0000 + 0x4000 );
		m_ram_c000 = m_ram_0000 + 0xc000;
		membank( "e000" )->set_base( m_ram_0000 + 0xe000 );

		if ( m_pia0_porta & 0x80 )
		{
			membank( "0000" )->set_base( memregion("maincpu")->base());
			/* When BIOS is enabled 2000-3FFF is set to the "ROM RAM" */
			membank( "2000" )->set_base( ram_ptr + 0x20000 );
		}

		if ( m_pia0_porta & 0x40 )
			m_ram_c000 = m_vram_region->base();
	}

	DECLARE_WRITE8_MEMBER(osbexec_0000_w);
	DECLARE_READ8_MEMBER(osbexec_c000_r);
	DECLARE_WRITE8_MEMBER(osbexec_c000_w);
	DECLARE_READ8_MEMBER(osbexec_kbd_r);
	DECLARE_READ8_MEMBER(osbexec_rtc_r);
	void init_osbexec();
	virtual void machine_reset() override;
	TIMER_CALLBACK_MEMBER(osbexec_video_callback);
	DECLARE_READ8_MEMBER(osbexec_pia0_a_r);
	DECLARE_WRITE8_MEMBER(osbexec_pia0_a_w);
	DECLARE_READ8_MEMBER(osbexec_pia0_b_r);
	DECLARE_WRITE8_MEMBER(osbexec_pia0_b_w);
	DECLARE_WRITE_LINE_MEMBER(osbexec_pia0_ca2_w);
	DECLARE_WRITE_LINE_MEMBER(osbexec_pia0_cb2_w);
	DECLARE_WRITE_LINE_MEMBER(modem_txclk_w);
	DECLARE_WRITE_LINE_MEMBER(modem_rxclk_w);
	DECLARE_WRITE_LINE_MEMBER(modem_dsr_w);
	DECLARE_WRITE_LINE_MEMBER(modem_ri_w);
	DECLARE_WRITE_LINE_MEMBER(comm_clk_a_w);
	void osbexec(machine_config &config);
	void osbexec_io(address_map &map);
	void osbexec_mem(address_map &map);
};


WRITE8_MEMBER(osbexec_state::osbexec_0000_w)
{
	/* Font RAM writing is enabled when ROM bank is enabled */
	if ( m_pia0_porta & 0x80 )
	{
		if ( offset < 0x1000 )
			m_fontram[ offset ] = data;
	}
	else
	{
		m_ram_0000[ offset ] = data;
	}
}


READ8_MEMBER(osbexec_state::osbexec_c000_r)
{
	uint8_t   data = m_ram_c000[offset];

	if ( ( m_pia0_porta & 0x40 ) && offset < 0x1000 )
	{
		m_temp_attr = m_ram_c000[ 0x1000 + offset ];
	}

	return data;
}


WRITE8_MEMBER(osbexec_state::osbexec_c000_w)
{
	m_ram_c000[offset] = data;

	if ( ( m_pia0_porta & 0x40 ) && offset < 0x1000 )
	{
		m_ram_c000[ 0x1000 + offset ] = m_temp_attr;
	}
}


READ8_MEMBER(osbexec_state::osbexec_kbd_r)
{
	uint8_t data = 0xFF;

	if ( offset & 0x0100 )
		data &= ioport( "ROW0" )->read();

	if ( offset & 0x0200 )
		data &= ioport( "ROW1" )->read();

	if ( offset & 0x0400 )
		data &= ioport( "ROW2" )->read();

	if ( offset & 0x0800 )
		data &= ioport( "ROW3" )->read();

	if ( offset & 0x1000 )
		data &= ioport( "ROW4" )->read();

	if ( offset & 0x2000 )
		data &= ioport( "ROW5" )->read();

	if ( offset & 0x4000 )
		data &= ioport( "ROW6" )->read();

	if ( offset & 0x8000 )
		data &= ioport( "ROW7" )->read();

	return data;
}


READ8_MEMBER(osbexec_state::osbexec_rtc_r)
{
	return m_rtc;
}


void osbexec_state::osbexec_mem(address_map &map)
{
	map(0x0000, 0x1FFF).bankr("0000").w(this, FUNC(osbexec_state::osbexec_0000_w));   /* ROM and maybe also banked ram */
	map(0x2000, 0x3FFF).bankrw("2000");                               /* Banked RAM */
	map(0x4000, 0xBFFF).bankrw("4000");                               /* Banked RAM */
	map(0xC000, 0xDFFF).rw(this, FUNC(osbexec_state::osbexec_c000_r), FUNC(osbexec_state::osbexec_c000_w));    /* Video ram / Banked RAM */
	map(0xE000, 0xEFFF).bankrw("e000");                               /* Banked RAM */
	map(0xF000, 0xFFFF).ram();                                           /* 4KB of non-banked RAM for system stack etc */
}


void osbexec_state::osbexec_io(address_map &map)
{
	map.unmap_value_high();
	map(0x00, 0x03).mirror(0xff00).rw(m_pia_0, FUNC(pia6821_device::read), FUNC(pia6821_device::write));       /* 6821 PIA @ UD12 */
	map(0x04, 0x07).mirror(0xff00).rw("ctc", FUNC(pit8253_device::read), FUNC(pit8253_device::write));          /* 8253 @UD1 */
	map(0x08, 0x0B).mirror(0xff00).rw(m_mb8877, FUNC(wd_fdc_device_base::read), FUNC(wd_fdc_device_base::write));  /* MB8877 @ UB17 input clock = 1MHz */
	map(0x0C, 0x0F).mirror(0xff00).rw(m_sio, FUNC(z80sio_device::ba_cd_r), FUNC(z80sio_device::ba_cd_w));    /* SIO @ UD4 */
	map(0x10, 0x13).mirror(0xff00).rw(m_pia_1, FUNC(pia6821_device::read), FUNC(pia6821_device::write));       /* 6821 PIA @ UD8 */
	map(0x14, 0x17).select(0xff00).r(this, FUNC(osbexec_state::osbexec_kbd_r));                                      /* KBD */
	map(0x18, 0x1b).mirror(0xff00).r(this, FUNC(osbexec_state::osbexec_rtc_r));                                      /* "RTC" @ UE13/UF13 */
	/* ?? - vid ? */
}


static INPUT_PORTS_START( osbexec )
	PORT_START("ROW0")
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_BACKSLASH2)   PORT_CHAR('[') PORT_CHAR(']')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_CLOSEBRACE)   PORT_CHAR('\'') PORT_CHAR('"')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Return") PORT_CODE(KEYCODE_ENTER) PORT_CHAR(13)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_RSHIFT)       PORT_CODE(KEYCODE_LSHIFT) PORT_CHAR(UCHAR_SHIFT_1)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LCONTROL)     PORT_CODE(KEYCODE_RCONTROL) PORT_CHAR(UCHAR_SHIFT_2)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_TAB)          PORT_CHAR('\t')
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_ESC)          PORT_CHAR(UCHAR_MAMEKEY(ESC))

	PORT_START("ROW1")
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_8)            PORT_CHAR('8') PORT_CHAR('*')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_7)            PORT_CHAR('7') PORT_CHAR('&')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_6)            PORT_CHAR('6') PORT_CHAR('^')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_5)            PORT_CHAR('5') PORT_CHAR('%')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_4)            PORT_CHAR('4') PORT_CHAR('$')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_3)            PORT_CHAR('3') PORT_CHAR('#')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_2)            PORT_CHAR('2') PORT_CHAR('@')
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_1)            PORT_CHAR('1') PORT_CHAR('!')

	PORT_START("ROW2")
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_I)            PORT_CHAR('i') PORT_CHAR('I')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_U)            PORT_CHAR('u') PORT_CHAR('U')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_Y)            PORT_CHAR('y') PORT_CHAR('Y')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_T)            PORT_CHAR('t') PORT_CHAR('T')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_R)            PORT_CHAR('r') PORT_CHAR('R')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_E)            PORT_CHAR('e') PORT_CHAR('E')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_W)            PORT_CHAR('w') PORT_CHAR('W')
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_Q)            PORT_CHAR('q') PORT_CHAR('Q')

	PORT_START("ROW3")
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_K)            PORT_CHAR('k') PORT_CHAR('K')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_J)            PORT_CHAR('j') PORT_CHAR('J')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_H)            PORT_CHAR('h') PORT_CHAR('H')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_G)            PORT_CHAR('g') PORT_CHAR('G')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_F)            PORT_CHAR('f') PORT_CHAR('F')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_D)            PORT_CHAR('d') PORT_CHAR('D')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_S)            PORT_CHAR('s') PORT_CHAR('S')
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_A)            PORT_CHAR('a') PORT_CHAR('A')

	PORT_START("ROW4")
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_COMMA)        PORT_CHAR(',') PORT_CHAR('<')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_M)            PORT_CHAR('m') PORT_CHAR('M')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_N)            PORT_CHAR('n') PORT_CHAR('N')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_B)            PORT_CHAR('b') PORT_CHAR('B')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_V)            PORT_CHAR('v') PORT_CHAR('V')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_C)            PORT_CHAR('c') PORT_CHAR('C')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_X)            PORT_CHAR('x') PORT_CHAR('X')
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_Z)            PORT_CHAR('z') PORT_CHAR('Z')

	PORT_START("ROW5")
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_9)            PORT_CHAR('9') PORT_CHAR('(')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_O)            PORT_CHAR('o') PORT_CHAR('O')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_P)            PORT_CHAR('p') PORT_CHAR('P')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_STOP)         PORT_CHAR('.') PORT_CHAR('>')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_SPACE)        PORT_CHAR(' ')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_0)            PORT_CHAR('0') PORT_CHAR(')')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LEFT)         PORT_CHAR(UCHAR_MAMEKEY(LEFT))
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_UP)           PORT_CHAR(UCHAR_MAMEKEY(UP))

	PORT_START("ROW6")
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_EQUALS)       PORT_CHAR('=') PORT_CHAR('+')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_L)            PORT_CHAR('l') PORT_CHAR('L')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_OPENBRACE)    PORT_CHAR('\\') PORT_CHAR('|')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_COLON)        PORT_CHAR(';') PORT_CHAR(':')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_SLASH)        PORT_CHAR('/') PORT_CHAR('?')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_MINUS)        PORT_CHAR('-') PORT_CHAR('_')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_DOWN)         PORT_CHAR(UCHAR_MAMEKEY(DOWN))
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_RIGHT)        PORT_CHAR(UCHAR_MAMEKEY(RIGHT))

	PORT_START("ROW7")
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_DIPNAME( 0x08, 0, "Alpha Lock" ) PORT_CODE(KEYCODE_CAPSLOCK) PORT_TOGGLE PORT_CHAR(UCHAR_MAMEKEY(CAPSLOCK))
	PORT_DIPSETTING(    0x08, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNUSED)
INPUT_PORTS_END


void osbexec_state::video_start()
{
	m_screen->register_screen_bitmap(m_bitmap);
}

uint32_t osbexec_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	copybitmap(bitmap, m_bitmap, 0, 0, 0, 0, cliprect);
	return 0;
}

/*
  UD12 - 6821 PIA

  Port A:
  PA7 - ROM BANK ENA
  PA6 - VRAM BANK ENA
  PA5 - BANK6ENA
  PA4 - BANK5ENA
  PA3 - BANK4ENA
  PA2 - BANK3ENA
  PA1 - BANK2ENA
  PA0 - BANK1ENA
  CA1 - DMA IRQ
  CA2 - KBD STB (i/o)

  Port B:
  PB7 - MODEM RI (input)
  PB6 - MODEM DSR (input)
  PB5 - TXC SEL
  PB4 - RXC SEL
  PB3 - speaker
  PB2 - DSEL2
  PB1 - DSEL1
  PB0 - DDEN
  CB1 - VBlank (input)
  CB2 - 60/50 (?)
*/

READ8_MEMBER(osbexec_state::osbexec_pia0_a_r)
{
	return m_pia0_porta;
}


WRITE8_MEMBER(osbexec_state::osbexec_pia0_a_w)
{
	//logerror("osbexec_pia0_a_w: %02x\n", data );

	m_pia0_porta = data;

	set_banks();
}


READ8_MEMBER(osbexec_state::osbexec_pia0_b_r)
{
	return m_pia0_portb;
}


WRITE8_MEMBER(osbexec_state::osbexec_pia0_b_w)
{
	m_pia0_portb = (m_pia0_portb & 0xc0) | (data & 0x3f);

	m_speaker->level_w(!BIT(data, 3));

	switch ( data & 0x06 )
	{
	case 0x02:
		m_mb8877->set_floppy(m_floppy1);
		m_floppy1->mon_w(0);
		break;
	case 0x04:
		m_mb8877->set_floppy(m_floppy0);
		m_floppy0->mon_w(0);
		break;
	default:
		m_mb8877->set_floppy(nullptr);
		break;
	}

	m_mb8877->dden_w(( data & 0x01 ) ? 1 : 0 );
}


WRITE_LINE_MEMBER(osbexec_state::osbexec_pia0_ca2_w)
{
	logerror("osbexec_pia0_ca2_w: state = %d\n", state);
}


WRITE_LINE_MEMBER(osbexec_state::osbexec_pia0_cb2_w)
{
	m_pia0_cb2 = state;
}


WRITE_LINE_MEMBER(osbexec_state::modem_txclk_w)
{
	if (BIT(m_pia0_portb, 5))
		m_sio->txca_w(!state);
}


WRITE_LINE_MEMBER(osbexec_state::modem_rxclk_w)
{
	if (BIT(m_pia0_portb, 4))
		m_sio->rxca_w(!state);
}


WRITE_LINE_MEMBER(osbexec_state::modem_dsr_w)
{
	m_pia0_portb &= 0xbf;
	if (!state)
		m_pia0_portb |= 0x40;
}


WRITE_LINE_MEMBER(osbexec_state::modem_ri_w)
{
	m_pia0_portb &= 0x7f;
	if (!state)
		m_pia0_portb |= 0x80;
}


WRITE_LINE_MEMBER(osbexec_state::comm_clk_a_w)
{
	//if (!BIT(m_pia0_portb, 5))
		m_sio->txca_w(state);
	//if (!BIT(m_pia0_portb, 4))
		m_sio->rxca_w(state);
	//m_modem->txclk_w(!state);
}


/*
 * The Osborne Executive supports the following disc formats: (TODO: Verify)
 * - Osborne single density: 40 tracks, 10 sectors per track, 256-byte sectors (100 KByte)
 * - Osborne double density: 40 tracks, 5 sectors per track, 1024-byte sectors (200 KByte)
 * - IBM Personal Computer: 40 tracks, 8 sectors per track, 512-byte sectors (160 KByte)
 * - Xerox 820 Computer: 40 tracks, 18 sectors per track, 128-byte sectors (90 KByte)
 * - DEC 1820 double density: 40 tracks, 9 sectors per track, 512-byte sectors (180 KByte)
 *
 */

static void osborne2_floppies(device_slot_interface &device)
{
	device.option_add("525ssdd", FLOPPY_525_SSDD);
}


TIMER_CALLBACK_MEMBER(osbexec_state::osbexec_video_callback)
{
	int y = m_screen->vpos();

	/* Start of frame */
	if ( y == 0 )
	{
		/* Clear CB1 on PIA @ UD12 */
		m_pia_0->cb1_w(0);
	}
	else if ( y == 240 )
	{
		/* Set CB1 on PIA @ UD12 */
		m_pia_0->cb1_w(1);
		m_rtc++;
	}
	if ( y < 240 )
	{
		uint16_t row_addr = ( y / 10 ) * 128;
		uint16_t *p = &m_bitmap.pix16(y);
		uint8_t char_line = y % 10;

		for ( int x = 0; x < 80; x++ )
		{
			uint8_t ch = m_vram[ row_addr + x ];
			uint8_t attr = m_vram[ 0x1000 + row_addr + x ];
			uint8_t fg_col = ( attr & 0x80 ) ? 2 : 1;
			uint8_t font_bits = m_fontram[ ( ( attr & 0x10 ) ? 0x800 : 0 ) + ( ch & 0x7f ) * 16 + char_line ];

			/* Check for underline */
			if ( ( attr & 0x40 ) && char_line == 9 )
				font_bits = 0xFF;

			/* Check for blink */
			if ( ( attr & 0x20 ) && ( m_rtc & 0x10 ) )
				font_bits = 0;

			/* Check for inverse video */
			if ( ( ch & 0x80 ) && ! ( attr & 0x10 ) )
				font_bits ^= 0xFF;

			for ( int b = 0; b < 8; b++ )
			{
				p[ x * 8 + b ] = ( font_bits & 0x80 ) ? fg_col : 0;
				font_bits <<= 1;
			}
		}
	}

	m_video_timer->adjust( m_screen->time_until_pos( y + 1, 0 ) );
}


void osbexec_state::init_osbexec()
{
	m_fontram_region = machine().memory().region_alloc( "fontram", 0x1000, 1, ENDIANNESS_LITTLE);
	m_vram_region = machine().memory().region_alloc( "vram", 0x2000, 1, ENDIANNESS_LITTLE );
	m_vram = m_vram_region->base();
	m_fontram = m_fontram_region->base();


	memset( m_fontram, 0x00, 0x1000 );
	memset( m_vram, 0x00, 0x2000 );

	m_video_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(osbexec_state::osbexec_video_callback),this));
}


void osbexec_state::machine_reset()
{
	m_pia0_porta = 0xC0;        /* Enable ROM and VRAM on reset */

	set_banks();

	m_video_timer->adjust( m_screen->time_until_pos( 0, 0 ) );

	m_rtc = 0;

	// D0 cleared on interrupt acknowledge cycle by TTL gates at UC21 and UA18
	m_maincpu->set_input_line_vector(0, 0xfe);
}


static const z80_daisy_config osbexec_daisy_config[] =
{
	{ "sio" },
	{ nullptr }
};


MACHINE_CONFIG_START(osbexec_state::osbexec)
	MCFG_DEVICE_ADD(m_maincpu, Z80, MAIN_CLOCK/6)
	MCFG_DEVICE_PROGRAM_MAP(osbexec_mem)
	MCFG_DEVICE_IO_MAP(osbexec_io)
	MCFG_Z80_DAISY_CHAIN(osbexec_daisy_config)

	MCFG_SCREEN_ADD_MONOCHROME(m_screen, RASTER, rgb_t::green())
	MCFG_SCREEN_UPDATE_DRIVER(osbexec_state, screen_update)
	MCFG_SCREEN_RAW_PARAMS(MAIN_CLOCK/2, 768, 0, 640, 260, 0, 240)    /* May not be correct */
	MCFG_SCREEN_PALETTE("palette")
	MCFG_PALETTE_ADD_MONOCHROME_HIGHLIGHT("palette")

	SPEAKER(config, "mono").front_center();
	MCFG_DEVICE_ADD(m_speaker, SPEAKER_SOUND)
	MCFG_SOUND_ROUTE( ALL_OUTPUTS, "mono", 1.00 )

	MCFG_DEVICE_ADD(m_pia_0, PIA6821, 0)
	MCFG_PIA_READPA_HANDLER(READ8(*this, osbexec_state, osbexec_pia0_a_r))
	MCFG_PIA_READPB_HANDLER(READ8(*this, osbexec_state, osbexec_pia0_b_r))
	MCFG_PIA_WRITEPA_HANDLER(WRITE8(*this, osbexec_state, osbexec_pia0_a_w))
	MCFG_PIA_WRITEPB_HANDLER(WRITE8(*this, osbexec_state, osbexec_pia0_b_w))
	MCFG_PIA_CA2_HANDLER(WRITELINE(*this, osbexec_state, osbexec_pia0_ca2_w))
	MCFG_PIA_CB2_HANDLER(WRITELINE(*this, osbexec_state, osbexec_pia0_cb2_w))
	MCFG_PIA_IRQA_HANDLER(WRITELINE("mainirq", input_merger_device, in_w<0>))
	MCFG_PIA_IRQB_HANDLER(WRITELINE("mainirq", input_merger_device, in_w<1>))

	MCFG_DEVICE_ADD(m_pia_1, PIA6821, 0)
	MCFG_PIA_IRQA_HANDLER(WRITELINE("mainirq", input_merger_device, in_w<2>))
	MCFG_PIA_IRQB_HANDLER(WRITELINE("mainirq", input_merger_device, in_w<3>))

	MCFG_INPUT_MERGER_ANY_HIGH("mainirq")
	MCFG_INPUT_MERGER_OUTPUT_HANDLER(INPUTLINE(m_maincpu, 0))

	MCFG_DEVICE_ADD(m_sio, Z80SIO, MAIN_CLOCK/6)
	MCFG_Z80SIO_OUT_TXDA_CB(WRITELINE(MODEM_PORT_TAG, rs232_port_device, write_txd)) MCFG_DEVCB_INVERT
	MCFG_Z80SIO_OUT_DTRA_CB(WRITELINE(MODEM_PORT_TAG, rs232_port_device, write_dtr)) MCFG_DEVCB_INVERT
	MCFG_Z80SIO_OUT_RTSA_CB(WRITELINE(MODEM_PORT_TAG, rs232_port_device, write_rts)) MCFG_DEVCB_INVERT
	MCFG_Z80SIO_OUT_TXDB_CB(WRITELINE(PRINTER_PORT_TAG, rs232_port_device, write_txd)) MCFG_DEVCB_INVERT
	MCFG_Z80SIO_OUT_DTRB_CB(WRITELINE(PRINTER_PORT_TAG, rs232_port_device, write_dtr)) MCFG_DEVCB_INVERT
	MCFG_Z80SIO_OUT_RTSB_CB(WRITELINE(PRINTER_PORT_TAG, rs232_port_device, write_rts)) MCFG_DEVCB_INVERT
	MCFG_Z80SIO_OUT_INT_CB(WRITELINE("mainirq", input_merger_device, in_w<4>))

	MCFG_DEVICE_ADD("ctc", PIT8253, 0)
	MCFG_PIT8253_CLK0(MAIN_CLOCK / 13) // divided by 74S161 @ UC25
	MCFG_PIT8253_CLK1(MAIN_CLOCK / 13) // divided by 74S161 @ UC25
	MCFG_PIT8253_CLK2(MAIN_CLOCK / 12)
	MCFG_PIT8253_OUT0_HANDLER(WRITELINE(*this, osbexec_state, comm_clk_a_w))
	MCFG_PIT8253_OUT1_HANDLER(WRITELINE(m_sio, z80sio_device, rxtxcb_w))
	//MCFG_PIT8253_OUT2_HANDLER(WRITELINE(*this, osbexec_state, spindle_clk_w))

	MCFG_DEVICE_ADD(MODEM_PORT_TAG, RS232_PORT, default_rs232_devices, nullptr)
	MCFG_RS232_RXD_HANDLER(WRITELINE(m_sio, z80sio_device, rxa_w)) MCFG_DEVCB_INVERT
	MCFG_RS232_DCD_HANDLER(WRITELINE(m_sio, z80sio_device, dcda_w)) MCFG_DEVCB_INVERT
	MCFG_RS232_DSR_HANDLER(WRITELINE(*this, osbexec_state, modem_dsr_w))
	MCFG_RS232_RI_HANDLER(WRITELINE(*this, osbexec_state, modem_ri_w))
	MCFG_RS232_CTS_HANDLER(WRITELINE(m_sio, z80sio_device, ctsa_w)) MCFG_DEVCB_INVERT

	MCFG_DEVICE_ADD(PRINTER_PORT_TAG, RS232_PORT, default_rs232_devices, nullptr)
	MCFG_RS232_RXD_HANDLER(WRITELINE(m_sio, z80sio_device, rxb_w)) MCFG_DEVCB_INVERT
	MCFG_RS232_DCD_HANDLER(WRITELINE(m_sio, z80sio_device, dcdb_w)) MCFG_DEVCB_INVERT
	MCFG_RS232_CTS_HANDLER(WRITELINE(m_sio, z80sio_device, ctsb_w)) MCFG_DEVCB_INVERT

	MCFG_DEVICE_ADD("mb8877", MB8877, MAIN_CLOCK/24)
	MCFG_WD_FDC_INTRQ_CALLBACK(WRITELINE(m_pia_1, pia6821_device, cb1_w))
	MCFG_FLOPPY_DRIVE_ADD("mb8877:0", osborne2_floppies, "525ssdd", floppy_image_device::default_floppy_formats)
	MCFG_FLOPPY_DRIVE_ADD("mb8877:1", osborne2_floppies, "525ssdd", floppy_image_device::default_floppy_formats)

	/* internal ram */
	MCFG_RAM_ADD(RAM_TAG)
	MCFG_RAM_DEFAULT_SIZE("136K")   /* 128KB Main RAM + RAM in ROM bank (8) */

	/* software lists */
	MCFG_SOFTWARE_LIST_ADD("flop_list", "osborne2")
MACHINE_CONFIG_END


ROM_START( osbexec )
	ROM_REGION(0x2000, "maincpu", 0)
	ROM_LOAD( "execv12.ud18", 0x0000, 0x2000, CRC(70798c2f) SHA1(2145a72da563bed1d6d455c77e48cc011a5f1153) )    /* Checksum C6B2 */
ROM_END

//    YEAR  NAME     PARENT  COMPAT  MACHINE  INPUT    CLASS          INIT          COMPANY    FULLNAME     FLAGS
COMP( 1982, osbexec, 0,      0,      osbexec, osbexec, osbexec_state, init_osbexec, "Osborne", "Executive", MACHINE_NOT_WORKING )