/***************************************************************************
	commodore c64 home computer

    peter.trauner@jk.uni-linz.ac.at
    documentation
     www.funet.fi
***************************************************************************/

/*
  unsolved problems:
   execution of code in the io devices
    (program write some short test code into the vic sprite register)
 */

#include <ctype.h>
#include "driver.h"
#include "cpu/m6502/m6502.h"
#include "cpu/z80/z80.h"
#include "sound/sid6581.h"

#define VERBOSE_DBG 1
#include "includes/cbm.h"
#include "includes/cia6526.h"
#include "includes/cbmserb.h"
#include "includes/vc1541.h"
#include "includes/vc20tape.h"
#include "includes/vic6567.h"
#include "includes/vdc8563.h"
#include "mscommon.h"

#include "includes/c128.h"
#include "includes/c65.h"

#include "includes/c64.h"

unsigned char c65_keyline = { 0xff };
int c65=0;
UINT8 c65_6511_port=0xff;

/* computer is a c128 */
int c128 = 0;

UINT8 c128_keyline[3] =
{0xff, 0xff, 0xff};


/* keyboard lines */
UINT8 c64_keyline[10] =
{
	0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};

/* expansion port lines input */
int c64_pal = 0;
UINT8 c64_game=1, c64_exrom=1;

/* cpu port */
UINT8 c64_port6510, c64_ddr6510;
int c128_va1617;
UINT8 *c64_vicaddr, *c128_vicaddr;
UINT8 *c64_memory;
UINT8 *c64_colorram;
UINT8 *c64_basic;
UINT8 *c64_kernal;
UINT8 *c64_chargen;
UINT8 *c64_roml=0;
UINT8 *c64_romh=0;

static UINT8 *roml=0, *romh=0;
static int ultimax = 0;
int c64_tape_on = 1;
static int c64_cia1_on = 1;
static UINT8 cartridge = 0;
static enum
{
	CartridgeAuto = 0, CartridgeUltimax, CartridgeC64,
	CartridgeSuperGames, CartridgeRobocop2
}
cartridgetype = CartridgeAuto;
static UINT8 cia0porta, cia0portb;
static UINT8 serial_clock, serial_data, serial_atn;
static UINT8 vicirq = 0, cia0irq = 0, cia1irq = 0;

static void c64_nmi(void)
{
    static int nmilevel = 0;
    if (nmilevel != KEY_RESTORE||cia1irq)
    {
	if (c128) {
	    if (cpu_getactivecpu()==0) 
		{
			/* z80 */
			cpunum_set_input_line(0, INPUT_LINE_NMI, KEY_RESTORE||cia1irq);
	    }
		else
		{
			cpunum_set_input_line(1, INPUT_LINE_NMI, KEY_RESTORE||cia1irq);
	    }
	}
	else
	{
	    cpunum_set_input_line(0, INPUT_LINE_NMI, KEY_RESTORE||cia1irq);
	}
	nmilevel = KEY_RESTORE||cia1irq;
    }
}


/*
 * cia 0
 * port a
 * 7-0 keyboard line select
 * 7,6: paddle select( 01 port a, 10 port b)
 * 4: joystick a fire button
 * 3,2: Paddles port a fire button
 * 3-0: joystick a direction
 * port b
 * 7-0: keyboard raw values
 * 4: joystick b fire button, lightpen select
 * 3,2: paddle b fire buttons (left,right)
 * 3-0: joystick b direction
 * flag cassette read input, serial request in
 * irq to irq connected
 */
int c64_cia0_port_a_r (int offset)
{
    int value = 0xff;

    if (!(cia0portb&0x80)) {
	UINT8 t=0xff;
	if (!(c64_keyline[7]&0x80)) t&=~0x80;
	if (!(c64_keyline[6]&0x80)) t&=~0x40;
	if (!(c64_keyline[5]&0x80)) t&=~0x20;
	if (!(c64_keyline[4]&0x80)) t&=~0x10;
	if (!(c64_keyline[3]&0x80)) t&=~0x08;
	if (!(c64_keyline[2]&0x80)) t&=~0x04;
	if (!(c64_keyline[1]&0x80)) t&=~0x02;
	if (!(c64_keyline[0]&0x80)) t&=~0x01;
	value &=t;
    }
    if (!(cia0portb&0x40)) {
	UINT8 t=0xff;
	if (!(c64_keyline[7]&0x40)) t&=~0x80;
	if (!(c64_keyline[6]&0x40)) t&=~0x40;
	if (!(c64_keyline[5]&0x40)) t&=~0x20;
	if (!(c64_keyline[4]&0x40)) t&=~0x10;
	if (!(c64_keyline[3]&0x40)) t&=~0x08;
	if (!(c64_keyline[2]&0x40)) t&=~0x04;
	if (!(c64_keyline[1]&0x40)) t&=~0x02;
	if (!(c64_keyline[0]&0x40)) t&=~0x01;
	value &=t;
    }
    if (!(cia0portb&0x20)) {
	UINT8 t=0xff;
	if (!(c64_keyline[7]&0x20)) t&=~0x80;
	if (!(c64_keyline[6]&0x20)) t&=~0x40;
	if (!(c64_keyline[5]&0x20)) t&=~0x20;
	if (!(c64_keyline[4]&0x20)) t&=~0x10;
	if (!(c64_keyline[3]&0x20)) t&=~0x08;
	if (!(c64_keyline[2]&0x20)) t&=~0x04;
	if (!(c64_keyline[1]&0x20)) t&=~0x02;
	if (!(c64_keyline[0]&0x20)) t&=~0x01;
	value &=t;
    }
    if (!(cia0portb&0x10)) {
	UINT8 t=0xff;
	if (!(c64_keyline[7]&0x10)) t&=~0x80;
	if (!(c64_keyline[6]&0x10)) t&=~0x40;
	if (!(c64_keyline[5]&0x10)) t&=~0x20;
	if (!(c64_keyline[4]&0x10)) t&=~0x10;
	if (!(c64_keyline[3]&0x10)) t&=~0x08;
	if (!(c64_keyline[2]&0x10)) t&=~0x04;
	if (!(c64_keyline[1]&0x10)) t&=~0x02;
	if (!(c64_keyline[0]&0x10)) t&=~0x01;
	value &=t;
    }
    if (!(cia0portb&0x08)) {
	UINT8 t=0xff;
	if (!(c64_keyline[7]&0x08)) t&=~0x80;
	if (!(c64_keyline[6]&0x08)) t&=~0x40;
	if (!(c64_keyline[5]&0x08)) t&=~0x20;
	if (!(c64_keyline[4]&0x08)) t&=~0x10;
	if (!(c64_keyline[3]&0x08)) t&=~0x08;
	if (!(c64_keyline[2]&0x08)) t&=~0x04;
	if (!(c64_keyline[1]&0x08)) t&=~0x02;
	if (!(c64_keyline[0]&0x08)) t&=~0x01;
	value &=t;
    }
    if (!(cia0portb&0x04)) {
	UINT8 t=0xff;
	if (!(c64_keyline[7]&0x04)) t&=~0x80;
	if (!(c64_keyline[6]&0x04)) t&=~0x40;
	if (!(c64_keyline[5]&0x04)) t&=~0x20;
	if (!(c64_keyline[4]&0x04)) t&=~0x10;
	if (!(c64_keyline[3]&0x04)) t&=~0x08;
	if (!(c64_keyline[2]&0x04)) t&=~0x04;
	if (!(c64_keyline[1]&0x04)) t&=~0x02;
	if (!(c64_keyline[0]&0x04)) t&=~0x01;
	value &=t;
    }
    if (!(cia0portb&0x02)) {
	UINT8 t=0xff;
	if (!(c64_keyline[7]&0x02)) t&=~0x80;
	if (!(c64_keyline[6]&0x02)) t&=~0x40;
	if (!(c64_keyline[5]&0x02)) t&=~0x20;
	if (!(c64_keyline[4]&0x02)) t&=~0x10;
	if (!(c64_keyline[3]&0x02)) t&=~0x08;
	if (!(c64_keyline[2]&0x02)) t&=~0x04;
	if (!(c64_keyline[1]&0x02)) t&=~0x02;
	if (!(c64_keyline[0]&0x02)) t&=~0x01;
	value &=t;
    }
    if (!(cia0portb&0x01)) {
	UINT8 t=0xff;
	if (!(c64_keyline[7]&0x01)) t&=~0x80;
	if (!(c64_keyline[6]&0x01)) t&=~0x40;
	if (!(c64_keyline[5]&0x01)) t&=~0x20;
	if (!(c64_keyline[4]&0x01)) t&=~0x10;
	if (!(c64_keyline[3]&0x01)) t&=~0x08;
	if (!(c64_keyline[2]&0x01)) t&=~0x04;
	if (!(c64_keyline[1]&0x01)) t&=~0x02;
	if (!(c64_keyline[0]&0x01)) t&=~0x01;
	value &=t;
    }

    if (JOYSTICK_SWAP) value &= c64_keyline[8];
    else value &= c64_keyline[9];

    return value;
}

int c64_cia0_port_b_r (int offset)
{
    int value = 0xff;

    if (!(cia0porta & 0x80)) value &= c64_keyline[7];
    if (!(cia0porta & 0x40)) value &= c64_keyline[6];
    if (!(cia0porta & 0x20)) value &= c64_keyline[5];
    if (!(cia0porta & 0x10)) value &= c64_keyline[4];
    if (!(cia0porta & 8)) value &= c64_keyline[3];
    if (!(cia0porta & 4)) value &= c64_keyline[2];
    if (!(cia0porta & 2)) value &= c64_keyline[1];
    if (!(cia0porta & 1)) value &= c64_keyline[0];

    if (JOYSTICK_SWAP) value &= c64_keyline[9];
    else value &= c64_keyline[8];

    if (c128)
    {
	if (!vic2e_k0_r ())
	    value &= c128_keyline[0];
	if (!vic2e_k1_r ())
	    value &= c128_keyline[1];
	if (!vic2e_k2_r ())
	    value &= c128_keyline[2];
    }
    if (c65) {
	if (!(c65_6511_port&2))
	    value&=c65_keyline;
    }

    return value;
}

void c64_cia0_port_a_w (int offset, int data)
{
    cia0porta = data;
}

static void c64_cia0_port_b_w (int offset, int data)
{
    cia0portb =data;
    vic2_lightpen_write (data & 0x10);
}

static void c64_irq (int level)
{
	static int old_level = 0;

	if (level != old_level)
	{
		DBG_LOG (3, "mos6510", ("irq %s\n", level ? "start" : "end"));
		if (c128) {
			if (0&&(cpu_getactivecpu()==0)) {
				cpunum_set_input_line (0, 0, level);
			} else {
				cpunum_set_input_line (1, M6510_IRQ_LINE, level);
			}
		} else {
			cpunum_set_input_line (0, M6510_IRQ_LINE, level);
		}
		old_level = level;
	}
}

WRITE8_HANDLER(c64_tape_read)
{
	cia6526_0_set_input_flag (data);
}

static void c64_cia0_interrupt (int level)
{
	if (level != cia0irq)
	{
		c64_irq (level || vicirq);
		cia0irq = level;
	}
}

void c64_vic_interrupt (int level)
{
#if 1
	if (level != vicirq)
	{
		c64_irq (level || cia0irq);
		vicirq = level;
	}
#endif
}

/*
 * cia 1
 * port a
 * 7 serial bus data input
 * 6 serial bus clock input
 * 5 serial bus data output
 * 4 serial bus clock output
 * 3 serial bus atn output
 * 2 rs232 data output
 * 1-0 vic-chip system memory bank select
 *
 * port b
 * 7 user rs232 data set ready
 * 6 user rs232 clear to send
 * 5 user
 * 4 user rs232 carrier detect
 * 3 user rs232 ring indicator
 * 2 user rs232 data terminal ready
 * 1 user rs232 request to send
 * 0 user rs232 received data
 * flag restore key or rs232 received data input
 * irq to nmi connected ?
 */
int c64_cia1_port_a_r (int offset)
{
	int value = 0xff;

	if (!serial_clock || !cbm_serial_clock_read ())
		value &= ~0x40;
	if (!serial_data || !cbm_serial_data_read ())
		value &= ~0x80;
	return value;
}

static void c64_cia1_port_a_w (int offset, int data)
{
	static int helper[4] =
	{0xc000, 0x8000, 0x4000, 0x0000};

	cbm_serial_clock_write (serial_clock = !(data & 0x10));
	cbm_serial_data_write (serial_data = !(data & 0x20));
	cbm_serial_atn_write (serial_atn = !(data & 8));
	c64_vicaddr = c64_memory + helper[data & 3];
	if (c128) {
		c128_vicaddr = c64_memory + helper[data & 3] + c128_va1617;
	}
}

static void c64_cia1_interrupt (int level)
{
	cia1irq = level;
	c64_nmi();
}

struct cia6526_interface c64_cia0 =
{
	c64_cia0_port_a_r,
	c64_cia0_port_b_r,
	c64_cia0_port_a_w,
	c64_cia0_port_b_w,
	0,								   /*c64_cia0_pc_w */
	0,								   /*c64_cia0_sp_r */
	0,								   /*c64_cia0_sp_w */
	0,								   /*c64_cia0_cnt_r */
	0,								   /*c64_cia0_cnt_w */
	c64_cia0_interrupt,
	0xff, 0xff, 0
}, c64_cia1 =
{
	c64_cia1_port_a_r,
	0,								   /*c64_cia1_port_b_r, */
	c64_cia1_port_a_w,
	0,								   /*c64_cia1_port_b_w, */
	0,								   /*c64_cia1_pc_w */
	0,								   /*c64_cia1_sp_r */
	0,								   /*c64_cia1_sp_w */
	0,								   /*c64_cia1_cnt_r */
	0,								   /*c64_cia1_cnt_w */
	c64_cia1_interrupt,
	0xc7, 0xff, 0
};

static void c64_bankswitch (int reset);
static void c64_robocop2_w(int offset, int value)
{
	/* robocop2 0xe00
	 * 80 94 80 94 80
	 * 80 81 80 82 83 80
	 */
	roml=cbm_rom[value&0xf].chip;
	romh=cbm_rom[(value&0xf)+0x10].chip;
	if (value & 0x80)
		{
			c64_game = value & 0x10;
			c64_exrom = 1;
		}
	else
		{
			c64_game = c64_exrom = 1;
		}
	if (c128)
		c128_bankswitch_64 (0);
	else
		c64_bankswitch (0);
}

static void c64_supergames_w(int offset, int value)
{
	/* supergam 0xf00
	 * 4 9 4
	 * 4 0 c
	 */
	roml=cbm_rom[value&3].chip;
	romh=cbm_rom[value&3].chip+0x2000;
	if (value & 4)
		{
			c64_game = 0;
			c64_exrom = 1;
		}
	else
		{
			c64_game = c64_exrom = 1;
		}
	if (value == 0xc)
		{
			c64_game = c64_exrom = 0;
		}
	if (c128)
		c128_bankswitch_64 (0);
	else
		c64_bankswitch (0);
}

WRITE8_HANDLER( c64_write_io )
{
	if (offset < 0x400) {
		vic2_port_w (offset & 0x3ff, data);
	} else if (offset < 0x800) {
		sid6581_0_port_w (offset & 0x3ff, data);
	} else if (offset < 0xc00)
		c64_colorram[offset & 0x3ff] = data | 0xf0;
	else if (offset < 0xd00)
		cia6526_0_port_w (offset & 0xff, data);
	else if (offset < 0xe00)
	{
		if (c64_cia1_on)
			cia6526_1_port_w (offset & 0xff, data);
		else
			DBG_LOG (1, "io write", ("%.3x %.2x\n", offset, data));
	}
	else if (offset < 0xf00)
	{
		/* i/o 1 */
		if (cartridge && (cartridgetype == CartridgeRobocop2))
		{
			c64_robocop2_w(offset&0xff, data);
		}
		else
			DBG_LOG (1, "io write", ("%.3x %.2x\n", offset, data));
	}
	else
	{
		/* i/o 2 */
		if (cartridge && (cartridgetype == CartridgeSuperGames))
		{
			c64_supergames_w(offset&0xff, data);
		}
		else
			DBG_LOG (1, "io write", ("%.3x %.2x\n", offset, data));
	}
}

 READ8_HANDLER( c64_read_io )
{
	if (offset < 0x400)
		return vic2_port_r (offset & 0x3ff);
	else if (offset < 0x800)
		return sid6581_0_port_r (offset & 0x3ff);
	else if (offset < 0xc00)
		return c64_colorram[offset & 0x3ff];
	else if (offset < 0xd00)
		return cia6526_0_port_r (offset & 0xff);
	else if (c64_cia1_on && (offset < 0xe00))
		return cia6526_1_port_r (offset & 0xff);
	DBG_LOG (1, "io read", ("%.3x\n", offset));
	return 0xff;
}

/*
 * two devices access bus, cpu and vic
 *
 * romh, roml chip select lines on expansion bus
 * loram, hiram, charen bankswitching select by cpu
 * exrom, game bankswitching select by cartridge
 * va15, va14 bank select by cpu for vic
 *
 * exrom, game: normal c64 mode
 * exrom, !game: ultimax mode
 *
 * romh: 8k rom at 0xa000 (hiram && !game && exrom)
 * or 8k ram at 0xe000 (!game exrom)
 * roml: 8k rom at 0x8000 (loram hiram !exrom)
 * or 8k ram at 0x8000 (!game exrom)
 * roml vic: upper 4k rom at 0x3000, 0x7000, 0xb000, 0xd000 (!game exrom)
 *
 * basic rom: 8k rom at 0xa000 (loram hiram game)
 * kernal rom: 8k rom at 0xe000 (hiram !exrom, hiram game)
 * char rom: 4k rom at 0xd000 (!exrom charen hiram
 * game charen !hiram loram
 * game charen hiram)
 * cpu
 *
 * (write colorram)
 * gr_w = !read&&!cas&&((address&0xf000)==0xd000)
 *
 * i_o = !game exrom !read ((address&0xf000)==0xd000)
 * !game exrom ((address&0xf000)==0xd000)
 * charen !hiram loram !read ((address&0xf000)==0xd000)
 * charen !hiram loram ((address&0xf000)==0xd000)
 * charen hiram !read ((address&0xf000)==0xd000)
 * charen hiram ((address&0xf000)==0xd000)
 *
 * vic
 * char rom: x101 (game, !exrom)
 * romh: 0011 (!game, exrom)
 *
 * exrom !game (ultimax mode)
 * addr    CPU     VIC-II
 * ----    ---     ------
 * 0000    RAM     RAM
 * 1000    -       RAM
 * 2000    -       RAM
 * 3000    -       ROMH (upper half)
 * 4000    -       RAM
 * 5000    -       RAM
 * 6000    -       RAM
 * 7000    -       ROMH
 * 8000    ROML    RAM
 * 9000    ROML    RAM
 * A000    -       RAM
 * B000    -       ROMH
 * C000    -       RAM
 * D000    I/O     RAM
 * E000    ROMH    RAM
 * F000    ROMH    ROMH
 */
static void c64_bankswitch (int reset)
{
	static int old = -1, exrom, game;
	int data, loram, hiram, charen;

	data = ((c64_port6510 & c64_ddr6510) | (c64_ddr6510 ^ 0xff)) & 7;
	if ((data == old)&&(exrom==c64_exrom)&&(game==c64_game)&&!reset) return;

	DBG_LOG (1, "bankswitch", ("%d\n", data & 7));
	loram = (data & 1) ? 1 : 0;
	hiram = (data & 2) ? 1 : 0;
	charen = (data & 4) ? 1 : 0;

	if ((!c64_game && c64_exrom)
	    || (loram && !c64_exrom)) /* for omega race cartridge */
/*	    || (loram && hiram && !c64_exrom)) */
	{
		cpu_setbank (1, roml);
		memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0x8000, 0x9fff, 0, 0, MWA8_RAM);	/* always ram: pitstop */
	}
	else
	{
		cpu_setbank (1, c64_memory + 0x8000);
		memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0x8000, 0x9fff, 0, 0, MWA8_RAM);
	}

#if 1
	if ((!c64_game && !c64_exrom && hiram)
	    /*|| (!c64_exrom)*/) /* must be disabled for 8kb c64 cartridges! like space action, super expander, ... */
#else
	if ((!c64_game && c64_exrom && hiram)
	    || (!c64_exrom) )
#endif
	{
		cpu_setbank (3, romh);
	}
	else if (loram && hiram &&c64_game)
	{
		cpu_setbank (3, c64_basic);
	}
	else
	{
		cpu_setbank (3, c64_memory + 0xa000);
	}

	if ((!c64_game && c64_exrom)
		|| (charen && (loram || hiram)))
	{
		memory_install_read8_handler(0, ADDRESS_SPACE_PROGRAM, 0xd000, 0xdfff, 0, 0, c64_read_io);
		memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0xd000, 0xdfff, 0, 0, c64_write_io);
	}
	else
	{
		memory_install_read8_handler(0, ADDRESS_SPACE_PROGRAM, 0xd000, 0xdfff, 0, 0, MRA8_BANK5);
		memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0xd000, 0xdfff, 0, 0, MWA8_BANK6);
		cpu_setbank (6, c64_memory + 0xd000);
		if (!charen && (loram || hiram))
		{
			cpu_setbank (5, c64_chargen);
		}
		else
		{
			cpu_setbank (5, c64_memory + 0xd000);
		}
	}

	if (!c64_game && c64_exrom)
	{
		cpu_setbank (7, romh);
		memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0xe000, 0xffff, 0, 0, MWA8_NOP);
	}
	else
	{
		memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0xe000, 0xffff, 0, 0, MWA8_RAM);
		if (hiram)
		{
			cpu_setbank (7, c64_kernal);
		}
		else
		{
			cpu_setbank (7, c64_memory + 0xe000);
		}
	}
	game = c64_game;
	exrom = c64_exrom;
	old = data;
}

/**
  ddr bit 1 port line is output
  port bit 1 port line is high

  p0 output loram
  p1 output hiram
  p2 output charen
  p3 output cassette data
  p4 input cassette switch
  p5 output cassette motor
  p6,7 not available on M6510
 */
WRITE8_HANDLER(c64_m6510_port_w)
{
	if (offset)
	{
		if (c64_port6510 != data)
			c64_port6510 = data;
	}
	else
	{
		if (c64_ddr6510 != data)
			c64_ddr6510 = data;
	}
	data = (c64_port6510 & c64_ddr6510) | (c64_ddr6510 ^ 0xff);
	if (c64_tape_on)
	{
		vc20_tape_write (!(data & 8));
		vc20_tape_motor (data & 0x20);
	}
	if (c128)
		c128_bankswitch_64 (0);
	else if (c65)
	{
		/* NPW 8-Feb-2004 - Don't know why I have to do this */
		/*c65_bankswitch(); */
	}
	else if (!ultimax)
		c64_bankswitch (0);
}

 READ8_HANDLER(c64_m6510_port_r)
{
	if (offset)
	{
		int data = (c64_ddr6510 & c64_port6510) | (c64_ddr6510 ^ 0xff);

		if (c64_tape_on && !(c64_ddr6510 & 0x10) && !vc20_tape_switch ())
			data &= ~0x10;
		if (c128 && !c128_capslock_r ())
			data &= ~0x40;
		if (c65 && C65_KEY_DIN)
			data &= ~0x40; /*? */
		return data;
	}
	else
	{
		return c64_ddr6510;
	}
}

int c64_paddle_read (int which)
{
	int pot1=0xff, pot2=0xff, pot3=0xff, pot4=0xff, temp;
	if (PADDLES34)
	{
		if (which) pot4=PADDLE4_VALUE;
		else pot3=PADDLE3_VALUE;
	}
	if (JOYSTICK2_2BUTTON&&which) {
		if (JOYSTICK_2_BUTTON2) pot4=0x00;
	}
	if (MOUSE2) {
		if (which) pot4=MOUSE2_Y;
		else pot3=MOUSE2_X;
	}
	if (PADDLES12) {
		if (which) pot2=PADDLE2_VALUE;
		else pot1=PADDLE1_VALUE;
	}
	if (JOYSTICK1_2BUTTON&&which) {
		if (JOYSTICK_1_BUTTON2) pot1=0x00;
	}
	if (MOUSE1) {
		if (which) pot2=MOUSE1_Y;
		else pot1=MOUSE1_X;
	}
	if (JOYSTICK_SWAP) {
		temp=pot1;pot1=pot2;pot2=pot1;
		temp=pot3;pot3=pot4;pot4=pot3;
	}
	switch (cia0porta & 0xc0) {
	case 0x40:
		if (which) return pot2;
		return pot1;
	case 0x80:
		if (which) return pot4;
			return pot3;
	default:
		return 0;
	}
}

 READ8_HANDLER(c64_colorram_read)
{
	return c64_colorram[offset & 0x3ff];
}

WRITE8_HANDLER( c64_colorram_write )
{
	c64_colorram[offset & 0x3ff] = data | 0xf0;
}

/*
 * only 14 address lines
 * a15 and a14 portlines
 * 0x1000-0x1fff, 0x9000-0x9fff char rom
 */
static int c64_dma_read (int offset)
{
	if (!c64_game && c64_exrom)
	{
		if (offset < 0x3000)
			return c64_memory[offset];
		return c64_romh[offset & 0x1fff];
	}
	if (((c64_vicaddr - c64_memory + offset) & 0x7000) == 0x1000)
		return c64_chargen[offset & 0xfff];
	return c64_vicaddr[offset];
}

static int c64_dma_read_ultimax (int offset)
{
	if (offset < 0x3000)
		return c64_memory[offset];
	return c64_romh[offset & 0x1fff];
}

static int c64_dma_read_color (int offset)
{
	return c64_colorram[offset & 0x3ff] & 0xf;
}

static void c64_common_driver_init (void)
{
	/*    memset(c64_memory, 0, 0xfd00); */
	if (!ultimax) {
		c64_basic=memory_region(REGION_CPU1)+0x10000;
		c64_kernal=memory_region(REGION_CPU1)+0x12000;
		c64_chargen=memory_region(REGION_CPU1)+0x14000;
		c64_colorram=memory_region(REGION_CPU1)+0x15000;
		c64_roml=memory_region(REGION_CPU1)+0x15400;
		c64_romh=memory_region(REGION_CPU1)+0x17400;
#if 0
	{0x10000, 0x11fff, MWA8_ROM, &c64_basic},	/* basic at 0xa000 */
	{0x12000, 0x13fff, MWA8_ROM, &c64_kernal},	/* kernal at 0xe000 */
	{0x14000, 0x14fff, MWA8_ROM, &c64_chargen},	/* charrom at 0xd000 */
	{0x15000, 0x153ff, MWA8_RAM, &c64_colorram},		/* colorram at 0xd800 */
	{0x15400, 0x173ff, MWA8_ROM, &c64_roml},	/* basic at 0xa000 */
	{0x17400, 0x193ff, MWA8_ROM, &c64_romh},	/* kernal at 0xe000 */
#endif
	}
	if (c64_tape_on)
		vc20_tape_open (c64_tape_read);

	cia6526_init();

	c64_cia0.todin50hz = c64_pal;
	cia6526_config (0, &c64_cia0);
	if (c64_cia1_on)
	{
		c64_cia1.todin50hz = c64_pal;
		cia6526_config (1, &c64_cia1);
	}

	if (ultimax)
	{
		vic6567_init (0, c64_pal, c64_dma_read_ultimax, c64_dma_read_color,
					  c64_vic_interrupt);
	}
	else
	{
		vic6567_init (0, c64_pal, c64_dma_read, c64_dma_read_color,
					  c64_vic_interrupt);
	}
	statetext_add_function(c64_state);

	cia6526_reset ();
}

void c64_driver_init (void)
{
	c64_common_driver_init ();
}

void c64pal_driver_init (void)
{
	c64_pal = 1;
	c64_common_driver_init ();
}

void ultimax_driver_init (void)
{
	ultimax = 1;
    c64_cia1_on = 0;
	c64_common_driver_init ();
}

void c64gs_driver_init (void)
{
	c64_pal = 1;
	c64_tape_on = 0;
    c64_cia1_on = 1;
	c64_common_driver_init ();
}

void sx64_driver_init (void)
{
	VC1541_CONFIG vc1541 = { 1, 8 };
	c64_tape_on = 0;
	c64_pal = 1;
	c64_common_driver_init ();
	vc1541_config (0, 0, &vc1541);
}

void c64_driver_shutdown (void)
{
	if (c64_tape_on)
		vc20_tape_close ();
}

void c64_common_init_machine (void)
{
#ifdef VC1541
	vc1541_reset ();
#endif
	sndti_reset(SOUND_SID6581, 0);

	if (c64_cia1_on)
	{
		cbm_serial_reset_write (0);
		cbm_drive_0_config (SERIAL8ON ? SERIAL : 0, c65?10:8);
		cbm_drive_1_config (SERIAL9ON ? SERIAL : 0, c65?11:9);
		serial_clock = serial_data = serial_atn = 1;
	}
	c64_vicaddr = c64_memory;
	vicirq = cia0irq = 0;
	c64_port6510 = 0xff;
	c64_ddr6510 = 0;
}

MACHINE_INIT( c64 )
{
	c64_common_init_machine ();

	c64_rom_recognition ();
	c64_rom_load();

	if (c128)
		c128_bankswitch_64 (1);
	if (!ultimax)
		c64_bankswitch (1);
}



#define BETWEEN(value1,value2,bottom,top) \
    ( ((value2)>=(bottom))&&((value1)<(top)) )

void c64_rom_recognition (void)
{
    int i;
    cartridgetype=CartridgeAuto;
    for (i=0; (i<sizeof(cbm_rom)/sizeof(cbm_rom[0]))
	     &&(cbm_rom[i].size!=0); i++) {
	cartridge=1;
	if ( BETWEEN(0xa000, 0xbfff, cbm_rom[i].addr,
		     cbm_rom[i].addr+cbm_rom[i].size) ) {
	    cartridgetype=CartridgeC64;
	} else if ( BETWEEN(0xe000, 0xffff, cbm_rom[i].addr,
			    cbm_rom[i].addr+cbm_rom[i].size) ) {
	    cartridgetype=CartridgeUltimax;
	}
    }
    if (i==4) cartridgetype=CartridgeSuperGames;
    if (i==32) cartridgetype=CartridgeRobocop2;
}

void c64_rom_load(void)
{
    int i;

    c64_exrom = 1;
    c64_game = 1;
    if (cartridge)
    {
	if (AUTO_MODULE && (cartridgetype == CartridgeAuto))
	{
	    logerror("Cartridge type not recognized using Machine type\n");
	}
	if (C64_MODULE && (cartridgetype == CartridgeUltimax))
	{
	    logerror("Cartridge could be ultimax type!?\n");
	}
	if (ULTIMAX_MODULE && (cartridgetype == CartridgeC64))
	{
	    logerror("Cartridge could be c64 type!?\n");
	}
	if (C64_MODULE)
	    cartridgetype = CartridgeC64;
	else if (ULTIMAX_MODULE)
	    cartridgetype = CartridgeUltimax;
	else if (SUPERGAMES_MODULE)
	    cartridgetype = CartridgeSuperGames;
	else if (ROBOCOP2_MODULE)
	    cartridgetype = CartridgeRobocop2;
	if ((cbm_c64_exrom!=-1)&&(cbm_c64_game!=-1)) {
	    c64_exrom=cbm_c64_exrom;
	    c64_game=cbm_c64_game;
	} else if (ultimax || (cartridgetype == CartridgeUltimax)) {
	    c64_game = 0;
	} else {
	    c64_exrom = 0;
	}
	if (ultimax) {
	    for (i=0; (i<sizeof(cbm_rom)/sizeof(cbm_rom[0]))
		     &&(cbm_rom[i].size!=0); i++) {
		if (cbm_rom[i].addr==CBM_ROM_ADDR_LO) {
		    memcpy(c64_memory+0x8000+0x2000-cbm_rom[i].size,
			   cbm_rom[i].chip, cbm_rom[i].size);
		} else if ((cbm_rom[i].addr==CBM_ROM_ADDR_HI)
			   ||(cbm_rom[i].addr==CBM_ROM_ADDR_UNKNOWN)) {
		    memcpy(c64_memory+0xe000+0x2000-cbm_rom[i].size,
			   cbm_rom[i].chip, cbm_rom[i].size);
		} else {
		    memcpy(c64_memory+cbm_rom[i].addr, cbm_rom[i].chip,
			   cbm_rom[i].size);
		}
	    }
        } else if ( (cartridgetype==CartridgeRobocop2)
		    ||(cartridgetype==CartridgeSuperGames) ) {
	    roml=0;
	    romh=0;
	    for (i=0; (i<sizeof(cbm_rom)/sizeof(cbm_rom[0]))
		     &&(cbm_rom[i].size!=0); i++) {
		if (!roml
		    && ((cbm_rom[i].addr==CBM_ROM_ADDR_UNKNOWN)
			||(cbm_rom[i].addr==CBM_ROM_ADDR_LO)
			||(cbm_rom[i].addr==0x8000)) ) {
		    roml=cbm_rom[i].chip;
		}
		if (!romh
		    && ((cbm_rom[i].addr==CBM_ROM_ADDR_HI)
			||(cbm_rom[i].addr==0xa000) ) ){
		    romh=cbm_rom[i].chip;
		}
		if (!romh
		    && (cbm_rom[i].addr==0x8000)
		    &&(cbm_rom[i].size==0x4000) ){
		    romh=cbm_rom[i].chip+0x2000;
		}
	    }
	} else /*if ((cartridgetype == CartridgeC64)||
				 (cartridgetype == CartridgeUltimax) )*/{
	    roml=c64_roml;
	    romh=c64_romh;
	    memset(roml, 0, 0x2000);
	    memset(romh, 0, 0x2000);
	    for (i=0; (i<sizeof(cbm_rom)/sizeof(cbm_rom[0]))
		     &&(cbm_rom[i].size!=0); i++) {
		if ((cbm_rom[i].addr==CBM_ROM_ADDR_UNKNOWN)
		    ||(cbm_rom[i].addr==CBM_ROM_ADDR_LO) ) {
		    memcpy(roml+0x2000-cbm_rom[i].size,
			   cbm_rom[i].chip, cbm_rom[i].size);
		} else if ( ((cartridgetype == CartridgeC64)
			     &&(cbm_rom[i].addr==CBM_ROM_ADDR_HI))
			    ||((cartridgetype==CartridgeUltimax)
			       &&(cbm_rom[i].addr==CBM_ROM_ADDR_HI)) ) {
		    memcpy(romh+0x2000-cbm_rom[i].size,
			   cbm_rom[i].chip, cbm_rom[i].size);
		} else if (cbm_rom[i].addr<0xc000) {
		    memcpy(roml+cbm_rom[i].addr-0x8000, cbm_rom[i].chip,
			   cbm_rom[i].size);
		} else {
		    memcpy(romh+cbm_rom[i].addr-0xe000,
			   cbm_rom[i].chip, cbm_rom[i].size);
		}
	    }
	}
    }
}

INTERRUPT_GEN( c64_frame_interrupt )
{
	static int monitor=-1;
	int value, value2;

	c64_nmi();

	if (c128) {
		if (MONITOR_TV!=monitor) {
			if (MONITOR_TV) {
				vic2_set_rastering(0);
				vdc8563_set_rastering(1);
				set_visible_area(0,655,0,215);
			} else {
				vic2_set_rastering(1);
				vdc8563_set_rastering(0);
				set_visible_area(0,335,0,215);
			}
			monitor=MONITOR_TV;
		}
	}

	value = 0xff;
	if (c128) {
		if (C128_KEY_CURSOR_DOWN)
			value &= ~0x80;
		if (C128_KEY_F5)
			value &= ~0x40;
		if (C128_KEY_F3)
			value &= ~0x20;
		if (C128_KEY_F1)
			value &= ~0x10;
		if (C128_KEY_F7)
			value &= ~8;
		if (C128_KEY_CURSOR_RIGHT)
			value &= ~4;
	} else if (c65) {
		if (C65_KEY_CURSOR_DOWN)
			value &= ~0x80;
		if (C65_KEY_F5)
			value &= ~0x40;
		if (C65_KEY_F3)
			value &= ~0x20;
		if (C65_KEY_F1)
			value &= ~0x10;
		if (C65_KEY_F7)
			value &= ~8;
		if (C65_KEY_CURSOR_RIGHT)
			value &= ~4;
	} else {
		if (KEY_CURSOR_DOWN)
			value &= ~0x80;
		if (KEY_F5)
			value &= ~0x40;
		if (KEY_F3)
			value &= ~0x20;
		if (KEY_F1)
			value &= ~0x10;
		if (KEY_F7)
			value &= ~8;
		if (KEY_CURSOR_RIGHT)
			value &= ~4;
	}
	if (KEY_RETURN)
		value &= ~2;
	if (KEY_DEL)
		value &= ~1;
	c64_keyline[0] = value;

	value = 0xff;
	if (KEY_LEFT_SHIFT)
		value &= ~0x80;
	if (KEY_E)
		value &= ~0x40;
	if (KEY_S)
		value &= ~0x20;
	if (KEY_Z)
		value &= ~0x10;
	if (KEY_4) value &= ~8;
	if (KEY_A)
		value &= ~4;
	if (KEY_W)
		value &= ~2;
	if (KEY_3) value &= ~1;
	c64_keyline[1] = value;

	value = 0xff;
	if (KEY_X)
		value &= ~0x80;
	if (KEY_T)
		value &= ~0x40;
	if (KEY_F)
		value &= ~0x20;
	if (KEY_C)
		value &= ~0x10;
	if (KEY_6) value &= ~8;
	if (KEY_D)
		value &= ~4;
	if (KEY_R)
		value &= ~2;
	if (KEY_5) value &= ~1;
	c64_keyline[2] = value;

	value = 0xff;
	if (KEY_V)
		value &= ~0x80;
	if (KEY_U)
		value &= ~0x40;
	if (KEY_H)
		value &= ~0x20;
	if (KEY_B)
		value &= ~0x10;
	if (KEY_8) value &= ~8;
	if (KEY_G)
		value &= ~4;
	if (KEY_Y)
		value &= ~2;
	if (KEY_7) value &= ~1;
	c64_keyline[3] = value;

	value = 0xff;
	if (KEY_N)
		value &= ~0x80;
	if (KEY_O)
		value &= ~0x40;
	if (KEY_K)
		value &= ~0x20;
	if (KEY_M)
		value &= ~0x10;
	if (KEY_0)
		value &= ~8;
	if (KEY_J)
		value &= ~4;
	if (KEY_I)
		value &= ~2;
	if (KEY_9)
		value &= ~1;
	c64_keyline[4] = value;

	value = 0xff;
	if (KEY_COMMA)
		value &= ~0x80;
	if (KEY_ATSIGN)
		value &= ~0x40;
	if (KEY_SEMICOLON)
		value &= ~0x20;
	if (KEY_POINT)
		value &= ~0x10;
	if (KEY_MINUS)
		value &= ~8;
	if (KEY_L)
		value &= ~4;
	if (KEY_P)
		value &= ~2;
	if (KEY_PLUS)
		value &= ~1;
	c64_keyline[5] = value;


	value = 0xff;
	if (KEY_SLASH)
		value &= ~0x80;
	if (KEY_ARROW_UP)
		value &= ~0x40;
	if (KEY_EQUALS)
		value &= ~0x20;
	if (c128) {
		if (C128_KEY_RIGHT_SHIFT)
		value &= ~0x10;
	} else if (c65) {
		if (C65_KEY_RIGHT_SHIFT)
		value &= ~0x10;
	} else {
		if (KEY_RIGHT_SHIFT)
		value &= ~0x10;
	}
	if (KEY_HOME)
		value &= ~8;
	if (KEY_COLON)
		value &= ~4;
	if (KEY_ASTERIX)
		value &= ~2;
	if (KEY_POUND)
		value &= ~1;
	c64_keyline[6] = value;

	value = 0xff;
	if (c65) {
		if (C65_KEY_STOP)
			value &= ~0x80;
		if (C65_KEY_SPACE)
			value &= ~0x10;
		if (C65_KEY_CTRL)
			value &= ~4;
	} else {
		if (KEY_STOP)
			value &= ~0x80;
		if (KEY_SPACE)
			value &= ~0x10;
		if (KEY_CTRL)
			value &= ~4;
	}
	if (KEY_Q)
		value &= ~0x40;
	if (KEY_CBM)
		value &= ~0x20;
	if (KEY_2) value &= ~8;
	if (KEY_ARROW_LEFT)
		value &= ~2;
	if (KEY_1) value &= ~1;
	c64_keyline[7] = value;

	value = 0xff;
	if (JOYSTICK1||JOYSTICK1_2BUTTON) {
		if (JOYSTICK_1_BUTTON)
			value &= ~0x10;
		if (JOYSTICK_1_RIGHT)
			value &= ~8;
		if (JOYSTICK_1_LEFT)
			value &= ~4;
		if (JOYSTICK_1_DOWN)
			value &= ~2;
		if (JOYSTICK_1_UP)
			value &= ~1;
	} else if (PADDLES12) {
		if (PADDLE2_BUTTON)
			value &= ~8;
		if (PADDLE1_BUTTON)
			value &= ~4;
	} else if (MOUSE1) {
		if (MOUSE1_BUTTON1)
			value &= ~0x10;
		if (MOUSE1_BUTTON2)
			value &= ~1;
	}
	c64_keyline[8] = value;

	value2 = 0xff;
	if (JOYSTICK2||JOYSTICK2_2BUTTON) {
		if (JOYSTICK_2_BUTTON)
			value2 &= ~0x10;
		if (JOYSTICK_2_RIGHT)
			value2 &= ~8;
		if (JOYSTICK_2_LEFT)
			value2 &= ~4;
		if (JOYSTICK_2_DOWN)
			value2 &= ~2;
		if (JOYSTICK_2_UP)
			value2 &= ~1;
	} else if (PADDLES34) {
		if (PADDLE4_BUTTON)
			value2 &= ~8;
		if (PADDLE3_BUTTON)
			value2 &= ~4;
	} else if (MOUSE2) {
		if (MOUSE2_BUTTON1)
			value2 &= ~0x10;
		if (MOUSE2_BUTTON2)
			value2 &= ~1;
	}
	c64_keyline[9] = value2;

	if ( c128 ) {
		value = 0xff;
		if (KEY_NUM1)
			value &= ~0x80;
		if (KEY_NUM7)
			value &= ~0x40;
		if (KEY_NUM4)
			value &= ~0x20;
		if (KEY_NUM2)
			value &= ~0x10;
		if (KEY_TAB)
			value &= ~8;
		if (KEY_NUM5)
			value &= ~4;
		if (KEY_NUM8)
			value &= ~2;
		if (KEY_HELP)
			value &= ~1;
		c128_keyline[0] = value;

		value = 0xff;
		if (KEY_NUM3)
			value &= ~0x80;
		if (KEY_NUM9)
			value &= ~0x40;
		if (KEY_NUM6)
			value &= ~0x20;
		if (KEY_NUMENTER)
			value &= ~0x10;
		if (KEY_LINEFEED)
			value &= ~8;
		if (KEY_NUMMINUS)
			value &= ~4;
		if (KEY_NUMPLUS)
			value &= ~2;
		if (KEY_ESCAPE)
			value &= ~1;
		c128_keyline[1] = value;

		value = 0xff;
		if (KEY_NOSCRL)
			value &= ~0x80;
		if (KEY_RIGHT)
			value &= ~0x40;
		if (KEY_LEFT)
			value &= ~0x20;
		if (KEY_DOWN)
			value &= ~0x10;
		if (KEY_UP)
			value &= ~8;
		if (KEY_NUMPOINT)
			value &= ~4;
		if (KEY_NUM0)
			value &= ~2;
		if (KEY_ALT)
			value &= ~1;
		c128_keyline[2] = value;
	}

	if (c65) {
		value = 0xff;
		if (C65_KEY_ESCAPE)
			value &= ~0x80;
		if (C65_KEY_F13)
			value &= ~0x40;
		if (C65_KEY_F11)
			value &= ~0x20;
		if (C65_KEY_F9)
			value &= ~0x10;
		if (C65_KEY_HELP)
			value &= ~8;
		if (C65_KEY_ALT) /* non blocking */
			value &= ~4;
		if (C65_KEY_TAB)
			value &= ~2;
		if (C65_KEY_NOSCRL)
			value &= ~1;
		c65_keyline = value;
	}

	vic2_frame_interrupt ();

	if (c64_tape_on) {
		vc20_tape_config (DATASSETTE, DATASSETTE_TONE);
		vc20_tape_buttons (DATASSETTE_PLAY, DATASSETTE_RECORD, DATASSETTE_STOP);
	}
	set_led_status (1 /*KB_CAPSLOCK_FLAG */ , KEY_SHIFTLOCK ? 1 : 0);
	set_led_status (0 /*KB_NUMLOCK_FLAG */ , JOYSTICK_SWAP ? 1 : 0);
}

void c64_state(void)
{
	char text[70];

#if VERBOSE_DBG
#if 0
	cia6526_status (text, sizeof (text));
	statetext_display_text (text);

	snprintf (text, sizeof(text), "c64 vic:%.4x m6510:%d exrom:%d game:%d",
			  c64_vicaddr - c64_memory, c64_port6510 & 7,
			  c64_exrom, c64_game);
	statetext_display_text (text);
#endif

	vdc8563_state();
/*	statetext_display_text (text); */
#endif

	vc20_tape_status (text, sizeof (text));
	statetext_display_text (text);
#ifdef VC1541
	vc1541_drive_status (text, sizeof (text));
#else
	cbm_drive_0_status (text, sizeof (text));
#endif
	statetext_display_text (text);

	cbm_drive_1_status (text, sizeof (text));
	statetext_display_text (text);
}

