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// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic, Robbbert
/***************************************************************************

Samsung SPC-1000 driver by Miodrag Milanovic

    2009-05-10 Preliminary driver.
    2014-02-16 Added cassette, many games are playable

ToDo:
- Find out if any of the unconnected parts of 6000,4000,4001 are used


NOTE: 2014-09-13: added code from someone's modified MESS driver for floppy
                  disk. Since it is not to our coding standards, it is
                  commented out with #if 0/#endif and 3 slashes (///).
                  It is planned to be converted when time permits. The
                  author is Miso Kim.

                  Hardware details of the fdc: Intelligent device, Z80 CPU,
                  XTAL_8MHz, PPI 8255, FDC uPD765C, 2 RAM chips, 28 other
                  small ics. And of course, no schematic.


2014-10-11: Replaced above code with MESS-compliant code [Meeso Kim]

2015-06-19: Added code for the centronics printer port

2016-01-14: Casstte tape motor fixed for working perperly and ROM file changed for CP/M disk loading

****************************************************************************/
/*
 * SAMSUNG SPC-1000 Series (info from zannylim)
 *
 * YEAR MODEL           MainVideo       PRT     FDD
 * ---- --------------  ------  -----   ------  -------
 * 1982 SPC-1000        S68047  RGB     buffer  -
 * 1983 SPC-1000        S68047  RF-TV   buffer  -
 * 1983 SPC-1100        S68047  RF-TV   -       -
 * 1983 SPC-1000/1100   MC6847  RF-TV   direct  support
 * 1985 SPC-1000A       MC6847  RF-TV   direct  support
 *
 * 2nd Video Display Processor type 1 : VDP UNIT (TMS9918 + 4KB VRAM) by staticsoft
 * 2nd Video Display Processor type 2 : SOFT BOX (TMS9918 + 4KB VRAM with BIOS) by sammi computer
 *
 * Intelligence FDD : SD-725(2FDD, RS232C), SD-720(1FDD), SD-725A(2FDD), SD-725B(Desktop 2FDD, RS232C) - EPSON TF20 F100
 * External FDD with Expansion slot : KWE-1000 by kyungwoo
 *
 * Network device : ISAM-1000 by samsung
 *
 *              +---------PRT------RGB----TVRF--+   SPC-1000
 *              +                               +
 *              +   ROM0                        +   CPU : Z80A (4MHz)
 *              +   ROM1                        +   RAM : 64KB
 *      +-------+   ROM2  AY-3-8910             +   VRAM : 6KB
 *      +                             SPC-1000  +   VDG : AMI S68047 with TTL RGB output
 *     IPL                                      +   PSG : AY-3-8910
 *     RESET                          S68047    +
 *      +           Z80A                        +   Include Internal Data-recorder
 *      +    ROM3                               +
 *      +                                       +   ROM : 32KB (8KB x 4)
 *      +---------------------------------------+
 *
 *              +---------PRT----VIDEO----TVRF--+   SPC-1000
 *              +                               +
 *              +   ROM0                 LM1889 +   Support RF TV Support, but Removed RGB output
 *              +   ROM1                        +
 *      +-------+   ROM2  AY-3-8910   SPC-1000  +
 *      +                                 1100  +
 *     IPL                                      +
 *     RESET                          S68047    +
 *      +           Z80A                        +
 *      +    ROM3                               +
 *      +                                       +
 *      +---------------------------------------+
 *
 *              +----------------VIDEO----TVRF--+   SPC-1100
 *              +                               +
 *              +   ROM0                 LM1889 +   Removed Printer port
 *              +   ROM1       LM386(5V)        +
 *      +-------+   ROM2  AY-3-8910   SPC-1000  +
 *      +                                 1100  +
 *     IPL                                      +
 *     RESET                          S68047    +
 *      +           Z80A                        +
 *      +    ROM3                               +
 *      +                                       +
 *      +---------------------------------------+
 *
 *              +---------PRT----VIDEO----TVRF--+   SPC-1000, SPC-1100
 *              +                               +
 *              +   ROM0                 MC1372 +   New Video Display Generator : MC6847
 *              +   ROM1       LM386(5V)        +
 *      +-------+   ROM2  AY-3-8910             +
 *      +           ROM3         SPC-1000/1100  +
 *     IPL                                      +
 *     RESET                          MC6847    +
 *      +           Z80A                        +
 *      +                                       +
 *      +                                       +
 *      +---------------------------------------+
 *
 *              +---------PRT----VIDEO----TVRF--+   SPC-1000, SPC-1100
 *              +                               +
 *              +   ROM0              S4 MC1372 +   REV PCB No.839291
 *              +   ROM1       LM386(5V)        +
 *      +-------+   ROM2  AY-3-8910             +   Add composite color on/off switch
 *      +           ROM3         SPC-1000/1100  +
 *     IPL                                      +
 *     RESET                          MC6847    +
 *      +           Z80A                        +
 *      +                                       +
 *      +                                       +
 *      +---------------------------------------+
 *
 *              +---------PRT----VIDEO----TVRF--+   SPC-1000A
 *              +                               +
 *              +   ROM0              S4 MC1372 +   Internal Data-recorder with Cassette Audio Player
 *              +   ROM1       LM386(12V)       +   Add FDD auto detect
 *      +-------+   ROM2  AY-3-8910             +   Remove IPL button
 *      + SPC-1000A ROM3                        +   Change DRAM refresh circuit
 *     IPL                                      +   Use 64K DRAM made by Samsung
 *      +                             MC6847    +   Use TTL IC made by Goldstar
 *      +           Z80A                        +
 *      +                                       +
 *      +                                       +
 *      +---------------------------------------+
 *
 */

#include "emu.h"
#include "cpu/z80/z80.h"
#include "machine/ram.h"
#include "sound/ay8910.h"
#include "sound/wave.h"
#include "video/mc6847.h"
#include "imagedev/cassette.h"
#include "formats/spc1000_cas.h"
#include "bus/centronics/ctronics.h"

#include "bus/spc1000/exp.h"
#include "bus/spc1000/fdd.h"
#include "bus/spc1000/vdp.h"

#include "softlist.h"

class spc1000_state : public driver_device
{
public:
	spc1000_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_vdg(*this, "mc6847")
		, m_cass(*this, "cassette")
		, m_ram(*this, RAM_TAG)
		, m_p_videoram(*this, "videoram")
		, m_io_kb(*this, "LINE")
		, m_io_joy(*this, "JOY")
		, m_centronics(*this, "centronics")
	{}

	DECLARE_WRITE8_MEMBER(iplk_w);
	DECLARE_READ8_MEMBER(iplk_r);
	DECLARE_WRITE_LINE_MEMBER(irq_w);
	DECLARE_WRITE8_MEMBER(gmode_w);
	DECLARE_READ8_MEMBER(gmode_r);
	DECLARE_READ8_MEMBER(porta_r);
	DECLARE_WRITE_LINE_MEMBER( centronics_busy_w ) { m_centronics_busy = state; }
	DECLARE_READ8_MEMBER(mc6847_videoram_r);
	DECLARE_WRITE8_MEMBER(cass_w);
	DECLARE_READ8_MEMBER(keyboard_r);
	MC6847_GET_CHARROM_MEMBER(get_char_rom)
	{
		return m_p_videoram[0x1000 + (ch & 0x7f) * 16 + line];
	}

private:
	UINT8 m_IPLK;
	UINT8 m_GMODE;
	UINT16 m_page;
	std::unique_ptr<UINT8[]> m_work_ram;
	attotime m_time;
	bool m_centronics_busy;
	virtual void machine_start() override;
	virtual void machine_reset() override;
	required_device<z80_device> m_maincpu;
	required_device<mc6847_base_device> m_vdg;
	required_device<cassette_image_device> m_cass;
	required_device<ram_device> m_ram;
	required_shared_ptr<UINT8> m_p_videoram;
	required_ioport_array<10> m_io_kb;
	required_ioport m_io_joy;
	required_device<centronics_device> m_centronics;
};

static ADDRESS_MAP_START(spc1000_mem, AS_PROGRAM, 8, spc1000_state )
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE(0x0000, 0x7fff) AM_READ_BANK("bank1") AM_WRITE_BANK("bank2")
	AM_RANGE(0x8000, 0xffff) AM_READ_BANK("bank3") AM_WRITE_BANK("bank4")
ADDRESS_MAP_END

WRITE8_MEMBER(spc1000_state::iplk_w)
{
	m_IPLK = m_IPLK ? 0 : 1;
	membank("bank1")->set_entry(m_IPLK);
	membank("bank3")->set_entry(m_IPLK);
}

READ8_MEMBER(spc1000_state::iplk_r)
{
	m_IPLK = m_IPLK ? 0 : 1;
	membank("bank1")->set_entry(m_IPLK);
	membank("bank3")->set_entry(m_IPLK);

	return 0;
}

WRITE8_MEMBER( spc1000_state::cass_w )
{
	attotime time = machine().scheduler().time();
	m_cass->output(BIT(data, 0) ? -1.0 : 1.0);
	if (BIT(data, 1) && (time - m_time).as_attoseconds()/ATTOSECONDS_PER_MICROSECOND > 100) {
		m_cass->change_state((m_cass->get_state() & CASSETTE_MASK_MOTOR) == CASSETTE_MOTOR_DISABLED ? CASSETTE_MOTOR_ENABLED : CASSETTE_MOTOR_DISABLED, CASSETTE_MASK_MOTOR);
		m_time = time;
	}
	m_centronics->write_strobe(BIT(data, 2) ? true : false);
}

WRITE8_MEMBER(spc1000_state::gmode_w)
{
	m_GMODE = data;

	// m_GMODE layout: CSS|NA|PS2|PS1|~A/G|GM0|GM1|NA
	//  [PS2,PS1] is used to set screen 0/1 pages
	m_vdg->gm1_w(BIT(data, 1));
	m_vdg->gm0_w(BIT(data, 2));
	m_vdg->ag_w(BIT(data, 3));
	m_vdg->css_w(BIT(data, 7));
	m_page = ((BIT(data, 5) << 1) | BIT(data, 4)) * 0x200;
}

READ8_MEMBER(spc1000_state::gmode_r)
{
	return m_GMODE;
}

READ8_MEMBER( spc1000_state::keyboard_r )
{
	// most games just read kb in $8000-$8009 but a few of them
	// (e.g. Toiler Adventure II and Vela) use mirrored addr instead
	offset &= 0xf;

	if (offset <= 9)
		return m_io_kb[offset]->read();
	else
		return 0xff;
}


static ADDRESS_MAP_START( spc1000_io , AS_IO, 8, spc1000_state )
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE(0x0000, 0x1fff) AM_RAM AM_SHARE("videoram")
	AM_RANGE(0x2000, 0x3fff) AM_READWRITE(gmode_r, gmode_w)
	AM_RANGE(0x4000, 0x4000) AM_DEVWRITE("ay8910", ay8910_device, address_w)
	AM_RANGE(0x4001, 0x4001) AM_DEVREADWRITE("ay8910", ay8910_device, data_r, data_w)
	AM_RANGE(0x6000, 0x6000) AM_WRITE(cass_w)
	AM_RANGE(0x8000, 0x9fff) AM_READ(keyboard_r)
	AM_RANGE(0xa000, 0xa000) AM_READWRITE(iplk_r, iplk_w)
	AM_RANGE(0xc000, 0xdfff) AM_DEVREADWRITE("ext1", spc1000_exp_device, read, write)
ADDRESS_MAP_END

/* Input ports */
static INPUT_PORTS_START( spc1000 )
	PORT_START("LINE.0")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Shift") PORT_CODE(KEYCODE_RSHIFT) PORT_CODE(KEYCODE_LSHIFT) PORT_CHAR(UCHAR_SHIFT_1)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Ctrl") PORT_CODE(KEYCODE_RCONTROL) PORT_CODE(KEYCODE_LCONTROL) PORT_CHAR(UCHAR_SHIFT_2)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Break") PORT_CODE(KEYCODE_PAUSE)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Graph") PORT_CODE(KEYCODE_LALT) PORT_CODE(KEYCODE_RALT)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNUSED)

	PORT_START("LINE.1")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("^ ~") PORT_CODE(KEYCODE_TILDE) PORT_CHAR('^') PORT_CHAR('~') PORT_CHAR(0x1e)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Home") PORT_CODE(KEYCODE_HOME)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Space") PORT_CODE(KEYCODE_SPACE) PORT_CHAR(' ')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Return") PORT_CODE(KEYCODE_ENTER) PORT_CHAR(13)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("C") PORT_CODE(KEYCODE_C) PORT_CHAR('c') PORT_CHAR('C') PORT_CHAR(0x03)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("A") PORT_CODE(KEYCODE_A) PORT_CHAR('a') PORT_CHAR('A') PORT_CHAR(0x01)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Q") PORT_CODE(KEYCODE_Q) PORT_CHAR('q') PORT_CHAR('Q') PORT_CHAR(0x16)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("1 !") PORT_CODE(KEYCODE_1) PORT_CHAR('1') PORT_CHAR('!')

	PORT_START("LINE.2")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Caps") PORT_CODE(KEYCODE_CAPSLOCK)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Z") PORT_CODE(KEYCODE_Z) PORT_CHAR('z') PORT_CHAR('Z') PORT_CHAR(0x1a)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("] }") PORT_CODE(KEYCODE_CLOSEBRACE) PORT_CHAR(']') PORT_CHAR('}') PORT_CHAR(0x1d)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("V") PORT_CODE(KEYCODE_V) PORT_CHAR('v') PORT_CHAR('V') PORT_CHAR(0x16)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("S") PORT_CODE(KEYCODE_S) PORT_CHAR('s') PORT_CHAR('S') PORT_CHAR(0x13)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("W") PORT_CODE(KEYCODE_W) PORT_CHAR('w') PORT_CHAR('W') PORT_CHAR(0x17)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("2 \"") PORT_CODE(KEYCODE_2) PORT_CHAR('2') PORT_CHAR('\"')

	PORT_START("LINE.3")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Del") PORT_CODE(KEYCODE_BACKSPACE) PORT_CHAR(8) PORT_CHAR(0x12)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("ESC") PORT_CODE(KEYCODE_ESC) PORT_CHAR(0x1b)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("[ {") PORT_CODE(KEYCODE_OPENBRACE) PORT_CHAR('[') PORT_CHAR('{') PORT_CHAR(0x1b)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("B") PORT_CODE(KEYCODE_B) PORT_CHAR('b') PORT_CHAR('B') PORT_CHAR(0x02)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("D") PORT_CODE(KEYCODE_D) PORT_CHAR('d') PORT_CHAR('D') PORT_CHAR(0x04)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("E") PORT_CODE(KEYCODE_E) PORT_CHAR('e') PORT_CHAR('E') PORT_CHAR(0x05)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("3 #") PORT_CODE(KEYCODE_3) PORT_CHAR('3') PORT_CHAR('#')

	PORT_START("LINE.4")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Right") PORT_CODE(KEYCODE_RIGHT)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("\\ |") PORT_CODE(KEYCODE_BACKSLASH) PORT_CHAR('\\') PORT_CHAR('|') PORT_CHAR(0x1c)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("N") PORT_CODE(KEYCODE_N) PORT_CHAR('n') PORT_CHAR('N') PORT_CHAR(0x0e)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F") PORT_CODE(KEYCODE_F) PORT_CHAR('f') PORT_CHAR('F') PORT_CHAR(0x06)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("R") PORT_CODE(KEYCODE_R) PORT_CHAR('r') PORT_CHAR('R') PORT_CHAR(0x12)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("4 $") PORT_CODE(KEYCODE_4) PORT_CHAR('4') PORT_CHAR('$')

	PORT_START("LINE.5")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F1") PORT_CODE(KEYCODE_F1)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Left") PORT_CODE(KEYCODE_LEFT)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("M") PORT_CODE(KEYCODE_M) PORT_CHAR('m') PORT_CHAR('M') PORT_CHAR(0x0d)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("G") PORT_CODE(KEYCODE_G) PORT_CHAR('g') PORT_CHAR('G') PORT_CHAR(0x07)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("T") PORT_CODE(KEYCODE_T) PORT_CHAR('t') PORT_CHAR('T') PORT_CHAR(0x14)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("5 %") PORT_CODE(KEYCODE_5) PORT_CHAR('5') PORT_CHAR('%')

	PORT_START("LINE.6")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F2") PORT_CODE(KEYCODE_F2)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("@ `") PORT_CODE(KEYCODE_EQUALS) PORT_CHAR('@') PORT_CHAR('`')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("X") PORT_CODE(KEYCODE_X) PORT_CHAR('x') PORT_CHAR('X') PORT_CHAR(0x18)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(", <") PORT_CODE(KEYCODE_COMMA) PORT_CHAR(',') PORT_CHAR('<')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("H") PORT_CODE(KEYCODE_H) PORT_CHAR('h') PORT_CHAR('H') PORT_CHAR(0x08)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Y") PORT_CODE(KEYCODE_Y) PORT_CHAR('y') PORT_CHAR('Y') PORT_CHAR(0x19)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("6 &") PORT_CODE(KEYCODE_6) PORT_CHAR('6') PORT_CHAR('&')

	PORT_START("LINE.7")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F3") PORT_CODE(KEYCODE_F3)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Up") PORT_CODE(KEYCODE_UP)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("P") PORT_CODE(KEYCODE_P) PORT_CHAR('p') PORT_CHAR('P') PORT_CHAR(0x10)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(". >") PORT_CODE(KEYCODE_STOP) PORT_CHAR('.') PORT_CHAR('>')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("J") PORT_CODE(KEYCODE_J) PORT_CHAR('j') PORT_CHAR('J') PORT_CHAR(0x0a)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("U") PORT_CODE(KEYCODE_U) PORT_CHAR('u') PORT_CHAR('U') PORT_CHAR(0x15)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("7 '") PORT_CODE(KEYCODE_7) PORT_CHAR('7') PORT_CHAR('\'')

	PORT_START("LINE.8")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F4") PORT_CODE(KEYCODE_F4)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Down") PORT_CODE(KEYCODE_DOWN)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME(": *") PORT_CODE(KEYCODE_QUOTE) PORT_CHAR(':') PORT_CHAR('*')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("/ ?") PORT_CODE(KEYCODE_SLASH) PORT_CHAR('/') PORT_CHAR('?')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("K") PORT_CODE(KEYCODE_K) PORT_CHAR('k') PORT_CHAR('K') PORT_CHAR(0x0b)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("I") PORT_CODE(KEYCODE_I) PORT_CHAR('i') PORT_CHAR('I') PORT_CHAR(0x09)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("8 (") PORT_CODE(KEYCODE_8) PORT_CHAR('8') PORT_CHAR('(')

	PORT_START("LINE.9")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_START)    PORT_NAME("IPL") PORT_CODE(KEYCODE_END)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F5") PORT_CODE(KEYCODE_F5)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("- =") PORT_CODE(KEYCODE_MINUS) PORT_CHAR('-') PORT_CHAR('=')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("0") PORT_CODE(KEYCODE_0) PORT_CHAR('0')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("; +") PORT_CODE(KEYCODE_COLON) PORT_CHAR(';') PORT_CHAR('+')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("L") PORT_CODE(KEYCODE_L) PORT_CHAR('l') PORT_CHAR('L') PORT_CHAR(0x0c)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("O") PORT_CODE(KEYCODE_O) PORT_CHAR('o') PORT_CHAR('O') PORT_CHAR(0x0e)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("9 )") PORT_CODE(KEYCODE_9) PORT_CHAR('9') PORT_CHAR(')')

	PORT_START("JOY")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_BUTTON1 ) PORT_PLAYER(1)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(1)
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(1)
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(1)
	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(1)
	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_UNUSED) // Button 2?
	PORT_BIT(0xc0, IP_ACTIVE_HIGH, IPT_UNUSED) // Cassette related
INPUT_PORTS_END


void spc1000_state::machine_start()
{
	UINT8 *mem = memregion("maincpu")->base();
	UINT8 *ram = m_ram->pointer();

	// configure and intialize banks 1 & 3 (read banks)
	membank("bank1")->configure_entry(0, ram);
	membank("bank1")->configure_entry(1, mem);
	membank("bank3")->configure_entry(0, ram + 0x8000);
	membank("bank3")->configure_entry(1, mem);
	membank("bank1")->set_entry(1);
	membank("bank3")->set_entry(1);

	// intialize banks 2 & 4 (write banks)
	membank("bank2")->set_base(ram);
	membank("bank4")->set_base(ram + 0x8000);

		m_time = machine().scheduler().time();
}

void spc1000_state::machine_reset()
{
	m_work_ram = make_unique_clear<UINT8[]>(0x10000);
	m_IPLK = 1;
}

READ8_MEMBER(spc1000_state::mc6847_videoram_r)
{
	if (offset == ~0)
		return 0xff;

	// m_GMODE layout: CSS|NA|PS2|PS1|~A/G|GM0|GM1|NA
	if (!BIT(m_GMODE, 3))
	{   // text mode (~A/G set to A)
		UINT8 data = m_p_videoram[offset + m_page + 0x800];
		m_vdg->inv_w(BIT(data, 0));
		m_vdg->css_w(BIT(data, 1));
		m_vdg->as_w (BIT(data, 2));
		m_vdg->intext_w(BIT(data, 3));
		return m_p_videoram[offset + m_page];
	}
	else
	{    // graphics mode: uses full 6KB of VRAM
		return m_p_videoram[offset];
	}
}

READ8_MEMBER( spc1000_state::porta_r )
{
	UINT8 data = 0x3f;
	data |= (m_cass->input() > 0.0038) ? 0x80 : 0;
	data |= ((m_cass->get_state() & CASSETTE_MASK_UISTATE) == CASSETTE_STOPPED || ((m_cass->get_state() & CASSETTE_MASK_MOTOR) == CASSETTE_MOTOR_DISABLED)) ? 0x40 : 0;
	data &= ~(m_io_joy->read() & 0x3f);
	data &= ~((m_centronics_busy == 0)<< 5);
	return data;
}

// irq is inverted in emulation, so we need this trampoline
WRITE_LINE_MEMBER( spc1000_state::irq_w )
{
	m_maincpu->set_input_line(0, state ? CLEAR_LINE : HOLD_LINE);
}

//-------------------------------------------------
//  address maps
//-------------------------------------------------

extern SLOT_INTERFACE_START(spc1000_exp)
	SLOT_INTERFACE("fdd", SPC1000_FDD_EXP)
	SLOT_INTERFACE("vdp", SPC1000_VDP_EXP)
SLOT_INTERFACE_END

static MACHINE_CONFIG_START( spc1000, spc1000_state )
	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu",Z80, XTAL_4MHz)
	MCFG_CPU_PROGRAM_MAP(spc1000_mem)
	MCFG_CPU_IO_MAP(spc1000_io)

	/* video hardware */
	MCFG_SCREEN_MC6847_NTSC_ADD("screen", "mc6847")

	MCFG_DEVICE_ADD("mc6847", MC6847_NTSC, XTAL_3_579545MHz)
	MCFG_MC6847_FSYNC_CALLBACK(WRITELINE(spc1000_state, irq_w))
	MCFG_MC6847_INPUT_CALLBACK(READ8(spc1000_state, mc6847_videoram_r))
	MCFG_MC6847_CHARROM_CALLBACK(spc1000_state, get_char_rom)
	MCFG_MC6847_FIXED_MODE(MC6847_MODE_GM2)
	// other lines not connected

	/* sound hardware */
	MCFG_SPEAKER_STANDARD_MONO("mono")
	MCFG_SOUND_ADD("ay8910", AY8910, XTAL_4MHz / 1)
	MCFG_AY8910_PORT_A_READ_CB(READ8(spc1000_state, porta_r))
	MCFG_AY8910_PORT_B_WRITE_CB(DEVWRITE8("cent_data_out", output_latch_device, write))
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00)
	MCFG_SOUND_WAVE_ADD(WAVE_TAG, "cassette")
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.05)

	MCFG_DEVICE_ADD("ext1", SPC1000_EXP_SLOT, 0)
	MCFG_DEVICE_SLOT_INTERFACE(spc1000_exp, nullptr, false)

	MCFG_CENTRONICS_ADD("centronics", centronics_devices, "printer")
	MCFG_CENTRONICS_BUSY_HANDLER(WRITELINE(spc1000_state, centronics_busy_w))
	MCFG_CENTRONICS_OUTPUT_LATCH_ADD("cent_data_out", "centronics")
	MCFG_DEVICE_ADD("cent_status_in", INPUT_BUFFER, 0)

	MCFG_CASSETTE_ADD("cassette")
	MCFG_CASSETTE_FORMATS(spc1000_cassette_formats)
	MCFG_CASSETTE_DEFAULT_STATE(CASSETTE_STOPPED | CASSETTE_SPEAKER_ENABLED | CASSETTE_MOTOR_DISABLED)
	MCFG_CASSETTE_INTERFACE("spc1000_cass")

	MCFG_SOFTWARE_LIST_ADD("cass_list", "spc1000_cass")

	/* internal ram */
	MCFG_RAM_ADD(RAM_TAG)
	MCFG_RAM_DEFAULT_SIZE("64K")
MACHINE_CONFIG_END

/* ROM definition */
ROM_START( spc1000 )
	ROM_REGION(0x10000, "maincpu", ROMREGION_ERASEFF)
	ROM_LOAD("spcall.rom", 0x0000, 0x8000, CRC(240426be) SHA1(8eb32e147c17a6d0f947b8bb3c6844750a7b64a8))
ROM_END

#if 0
ROM_START( spc1000 )
	ROM_REGION(0x10000, "maincpu", ROMREGION_ERASEFF)
	ROM_LOAD("spcall.rom", 0x0000, 0x8000, CRC(2fbb6eca) SHA1(cc9a076b0f00d54b2aec31f1f558b10f43ef61c8))
	/// more roms to come...
ROM_END
#endif


/* Driver */

/*    YEAR  NAME      PARENT  COMPAT   MACHINE    INPUT    CLASS         INIT    COMPANY    FULLNAME       FLAGS */
COMP( 1982, spc1000,  0,      0,       spc1000,   spc1000, driver_device,  0,   "Samsung", "SPC-1000", 0 )