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

DAI driver by Krzysztof Strzecha and Nathan Woods

What's new:
-----------
21.05.2004  TMS5501 fixes. Debug code cleanups.
06.03.2004  Stack overflow interrupt added.
05.09.2003  Random number generator added. Few video hardware bugs fixed.
        Fixed few I8080 instructions, making much more BASIC games playable.

Notes on emulation status and to do list:
-----------------------------------------
1. A lot to do. Too much to list.

DAI technical information
==========================

CPU:
----
    I8080 2MHz


Memory map:
-----------
    0000-bfff RAM
    c000-dfff ROM (non-switchable)
    e000-efff ROM (4 switchable banks)
    f000-f7ff ROM extension (optional)
    f800-f8ff SRAM (stack)
    f900-ffff I/O
        f900-faff spare
        fb00-fbff AMD9511 math chip (optional)
        fc00-fcff 8253 programmable interval timer
        fd00-fdff discrete devices
        fe00-feff 8255 PIO (DCE bus)
        ff00-ffff timer + 5501 interrupt controller

Interrupts:
-----------


Keyboard:
---------


Video:
-----


Sound:
------


Timings:
--------


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

#include "emu.h"
#include "cpu/i8085/i8085.h"
#include "sound/wave.h"
#include "machine/i8255.h"
#include "includes/dai.h"
#include "machine/pit8253.h"
#include "machine/tms5501.h"
#include "imagedev/cassette.h"
#include "machine/ram.h"

/* I/O ports */
static ADDRESS_MAP_START( dai_io , AS_IO, 8)
ADDRESS_MAP_END

/* memory w/r functions */
static ADDRESS_MAP_START( dai_mem , AS_PROGRAM, 8)
	AM_RANGE( 0x0000, 0xbfff) AM_RAMBANK("bank1")
	AM_RANGE( 0xc000, 0xdfff) AM_ROM
	AM_RANGE( 0xe000, 0xefff) AM_ROMBANK("bank2")
	AM_RANGE( 0xf000, 0xf7ff) AM_WRITE( dai_stack_interrupt_circuit_w )
	AM_RANGE( 0xf800, 0xf8ff) AM_RAM
	AM_RANGE( 0xfb00, 0xfbff) AM_READWRITE( dai_amd9511_r, dai_amd9511_w )
	AM_RANGE( 0xfc00, 0xfcff) AM_DEVREADWRITE("pit8253", pit8253_r, pit8253_w )
	AM_RANGE( 0xfd00, 0xfdff) AM_READWRITE( dai_io_discrete_devices_r, dai_io_discrete_devices_w )
	AM_RANGE( 0xfe00, 0xfeff) AM_DEVREADWRITE_MODERN("ppi8255", i8255_device, read, write)
	AM_RANGE( 0xff00, 0xffff) AM_DEVREADWRITE("tms5501", tms5501_r, tms5501_w )
ADDRESS_MAP_END


/* keyboard input */
static INPUT_PORTS_START (dai)
	PORT_START("IN0") /* [0] - port ff07 bit 0 */
		PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_0)			PORT_CHAR('0')
		PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_8)			PORT_CHAR('8') PORT_CHAR('(')
		PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Return") PORT_CODE(KEYCODE_ENTER) PORT_CHAR(13)
		PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_H)			PORT_CHAR('h') PORT_CHAR('H')
		PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_P)			PORT_CHAR('p') PORT_CHAR('P')
		PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_X)			PORT_CHAR('x') PORT_CHAR('X')
		PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_UP)			PORT_CHAR(UCHAR_MAMEKEY(UP))
		PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_UNUSED)
	PORT_START("IN1") /* [1] - port ff07 bit 1 */
		PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_1)			PORT_CHAR('1') PORT_CHAR('!')
		PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_9)			PORT_CHAR('9') PORT_CHAR(')')
		PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_A)			PORT_CHAR('a') PORT_CHAR('A')
		PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_I)			PORT_CHAR('i') PORT_CHAR('I')
		PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_Q)			PORT_CHAR('q') PORT_CHAR('Q')
		PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_Y)			PORT_CHAR('y') PORT_CHAR('Y')
		PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_DOWN)		PORT_CHAR(UCHAR_MAMEKEY(DOWN))
		PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_UNUSED)
	PORT_START("IN2") /* [2] - port ff07 bit 2 */
		PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_2)			PORT_CHAR('2') PORT_CHAR('"')
		PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_MINUS)		PORT_CHAR(':') PORT_CHAR('*')
		PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_B)			PORT_CHAR('b') PORT_CHAR('B')
		PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_J)			PORT_CHAR('j') PORT_CHAR('J')
		PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_R)			PORT_CHAR('r') PORT_CHAR('R')
		PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_Z)			PORT_CHAR('z') PORT_CHAR('Z')
		PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_LEFT)		PORT_CHAR(UCHAR_MAMEKEY(LEFT))
		PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_UNUSED)
	PORT_START("IN3") /* [3] - port ff07 bit 3 */
		PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_3)			PORT_CHAR('3') PORT_CHAR('#')
		PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_COLON)		PORT_CHAR(';') PORT_CHAR('+')
		PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_C)			PORT_CHAR('c') PORT_CHAR('C')
		PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_K)			PORT_CHAR('k') PORT_CHAR('K')
		PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_S)			PORT_CHAR('s') PORT_CHAR('S')
		PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_QUOTE)		PORT_CHAR('[') PORT_CHAR(']')
		PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_RIGHT)		PORT_CHAR(UCHAR_MAMEKEY(RIGHT))
		PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_UNUSED)
	PORT_START("IN4") /* [4] - port ff07 bit 4 */
		PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_4)			PORT_CHAR('4') PORT_CHAR('$')
		PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_COMMA)		PORT_CHAR(',') PORT_CHAR('<')
		PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_D)			PORT_CHAR('d') PORT_CHAR('D')
		PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_L)			PORT_CHAR('l') PORT_CHAR('L')
		PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_T)			PORT_CHAR('t') PORT_CHAR('T')
		PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_OPENBRACE)	PORT_CHAR('^') PORT_CHAR('~')
		PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_TAB)			PORT_CHAR('\t')
		PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_UNUSED)
	PORT_START("IN5") /* [5] - port ff07 bit 5 */
		PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_5)			PORT_CHAR('5') PORT_CHAR('%')
		PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_EQUALS)		PORT_CHAR('-') PORT_CHAR('=')
		PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_E)			PORT_CHAR('e') PORT_CHAR('E')
		PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_M)			PORT_CHAR('m') PORT_CHAR('M')
		PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_U)			PORT_CHAR('u') PORT_CHAR('U')
		PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_SPACE)		PORT_CHAR(' ')
		PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Ctrl") PORT_CODE(KEYCODE_LCONTROL) PORT_CHAR(UCHAR_MAMEKEY(LCONTROL))
		PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_UNUSED)
	PORT_START("IN6") /* [6] - port ff07 bit 6 */
		PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_6)			PORT_CHAR('6') PORT_CHAR('&')
		PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_STOP)		PORT_CHAR('.') PORT_CHAR('>')
		PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_F)			PORT_CHAR('f') PORT_CHAR('F')
		PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_N)			PORT_CHAR('n') PORT_CHAR('N')
		PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_V)			PORT_CHAR('v') PORT_CHAR('V')
		PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Rept") PORT_CODE(KEYCODE_INSERT) PORT_CHAR(UCHAR_MAMEKEY(INSERT))
		PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Break") PORT_CODE(KEYCODE_ESC) PORT_CHAR(27)
		PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_UNUSED)
	PORT_START("IN7") /* [7] - port ff07 bit 7 */
		PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_7)			PORT_CHAR('7') PORT_CHAR('\'')
		PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_SLASH)		PORT_CHAR('/') PORT_CHAR('?')
		PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_G)			PORT_CHAR('g') PORT_CHAR('G')
		PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_O)			PORT_CHAR('o') PORT_CHAR('O')
		PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_W)			PORT_CHAR('w') PORT_CHAR('W')
		PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Char del") PORT_CODE(KEYCODE_DEL) PORT_CHAR(UCHAR_MAMEKEY(DEL))
		PORT_BIT(0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Shift") PORT_CODE(KEYCODE_LSHIFT) PORT_CODE(KEYCODE_RSHIFT) PORT_CHAR(UCHAR_SHIFT_1)
		PORT_BIT(0x80, IP_ACTIVE_HIGH, IPT_UNUSED)
	PORT_START("IN8") /* [8] */
		PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_VBLANK)
		PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_BUTTON1) PORT_PLAYER(1)
		PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_BUTTON1) PORT_PLAYER(2)
		PORT_BIT(0xcb, IP_ACTIVE_HIGH, IPT_UNUSED)
INPUT_PORTS_END

static const struct CassetteOptions dai_cassette_options = {
	1,		/* channels */
	16,		/* bits per sample */
	44100		/* sample frequency */
};

static const cassette_interface dai_cassette_interface =
{
	cassette_default_formats,
	&dai_cassette_options,
	(cassette_state)(CASSETTE_PLAY | CASSETTE_MOTOR_DISABLED | CASSETTE_SPEAKER_ENABLED),
	NULL,
	NULL
};

/* F4 Character Displayer */
static const gfx_layout dai_charlayout =
{
	8, 16,					/* 8 x 16 characters */
	256,					/* 256 characters */
	1,					/* 1 bits per pixel */
	{ 0 },					/* no bitplanes */
	/* x offsets */
	{ 7, 6, 5, 4, 3, 2, 1, 0 },
	/* y offsets */
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
	8*16					/* every char takes 16 bytes */
};

static GFXDECODE_START( dai )
	GFXDECODE_ENTRY( "gfx1", 0x0000, dai_charlayout, 0, 8 )
GFXDECODE_END

/* machine definition */
static MACHINE_CONFIG_START( dai, dai_state )
	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", I8080, 2000000)
	MCFG_CPU_PROGRAM_MAP(dai_mem)
	MCFG_CPU_IO_MAP(dai_io)
	MCFG_QUANTUM_TIME(attotime::from_hz(60))

	MCFG_MACHINE_START( dai )
	MCFG_MACHINE_RESET( dai )

	MCFG_PIT8253_ADD( "pit8253", dai_pit8253_intf )

	MCFG_I8255_ADD( "ppi8255", dai_ppi82555_intf )

	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(50)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
	MCFG_SCREEN_FORMAT(BITMAP_FORMAT_INDEXED16)
	MCFG_SCREEN_SIZE(1056, 542)
	MCFG_SCREEN_VISIBLE_AREA(0, 1056-1, 0, 302-1)
	MCFG_SCREEN_UPDATE( dai )

	MCFG_GFXDECODE(dai)
	MCFG_PALETTE_LENGTH(sizeof (dai_palette) / 3)
	MCFG_PALETTE_INIT( dai )

	MCFG_VIDEO_START( dai )

	/* sound hardware */
	MCFG_SPEAKER_STANDARD_MONO("mono")
	MCFG_SOUND_WAVE_ADD(WAVE_TAG, CASSETTE_TAG)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)
	MCFG_SPEAKER_STANDARD_STEREO("lspeaker", "rspeaker")
	MCFG_SOUND_ADD("custom", DAI, 0)
	MCFG_SOUND_ROUTE(0, "lspeaker", 0.50)
	MCFG_SOUND_ROUTE(1, "rspeaker", 0.50)

	/* cassette */
	MCFG_CASSETTE_ADD( CASSETTE_TAG, dai_cassette_interface )

	/* tms5501 */
	MCFG_TMS5501_ADD( "tms5501", dai_tms5501_interface )

	/* internal ram */
	MCFG_RAM_ADD(RAM_TAG)
	MCFG_RAM_DEFAULT_SIZE("48K")
MACHINE_CONFIG_END

#define io_dai		io_NULL

ROM_START(dai)
	ROM_REGION(0x14000,"maincpu",0)
	ROM_LOAD("dai.bin", 0xc000, 0x2000, CRC(ca71a7d5) SHA1(6bbe2336c717354beab2ae201debeb4fd055bdcb))
	ROM_LOAD("dai00.bin", 0x10000, 0x1000, CRC(fa7d39ac) SHA1(3d1824a1f273882f934249ef3cb1b38ef99de7b9))
	ROM_LOAD("dai01.bin", 0x11000, 0x1000, CRC(cb5809f2) SHA1(523656f0a9d98888cd3e2bd66886c589e9ae75b4))
	ROM_LOAD("dai02.bin", 0x12000, 0x1000, CRC(03f72d4a) SHA1(573d65dc82321970dcaf81d7638a02252ea18a7a))
	ROM_LOAD("dai03.bin", 0x13000, 0x1000, CRC(c475c96f) SHA1(96fc3cc4b8a2873f0d044bd8033d1e7b7197dd97))
	ROM_REGION(0x2000, "gfx1",0)
	ROM_LOAD ("nch.bin", 0x0000, 0x1000, CRC(a9f5b30b) SHA1(24119b2984ab4e50dc0dabae1065ff6d6c1f237d))
ROM_END

/*    YEAR  NAME PARENT  COMPAT MACHINE INPUT   INIT     COMPANY                FULLNAME */
COMP( 1978, dai, 0,      0,	dai,	dai,	0,		"Data Applications International", "DAI Personal Computer", 0)
