text: #include "driver.h"
  #include "cpu/m6809/m6809.h"
  #include "machine/6522via.h"
  
  WRITE8_HANDLER( beezer_map_w );
  READ8_HANDLER( beezer_line_r );
  
  static int pbus;
  
  static READ8_HANDLER( b_via_0_pb_r );
  static WRITE8_HANDLER( b_via_0_pa_w );
  static WRITE8_HANDLER( b_via_0_pb_w );
  static READ8_HANDLER( b_via_0_ca2_r );
  static WRITE8_HANDLER( b_via_0_ca2_w );
  static void b_via_0_irq (int level);
  
  static READ8_HANDLER( b_via_1_pa_r );
  static READ8_HANDLER( b_via_1_pb_r );
  static WRITE8_HANDLER( b_via_1_pa_w );
  static WRITE8_HANDLER( b_via_1_pb_w );
  static void b_via_1_irq (int level);
  
  static struct via6522_interface b_via_0_interface =
  {
  	/*inputs : A/B         */ 0, b_via_0_pb_r,
  	/*inputs : CA/B1,CA/B2 */ 0, via_1_ca2_r, b_via_0_ca2_r, via_1_ca1_r,
  	/*outputs: A/B         */ b_via_0_pa_w, b_via_0_pb_w,
  	/*outputs: CA/B1,CA/B2 */ 0, 0, b_via_0_ca2_w, via_1_ca1_w,
  	/*irq                  */ b_via_0_irq
  };
  
  static struct via6522_interface b_via_1_interface =
  {
  	/*inputs : A/B         */ b_via_1_pa_r, b_via_1_pb_r,
  	/*inputs : CA/B1,CA/B2 */ via_0_cb2_r, 0, via_0_cb1_r, 0,
  	/*outputs: A/B         */ b_via_1_pa_w, b_via_1_pb_w,
  	/*outputs: CA/B1,CA/B2 */ 0, 0, via_0_cb1_w, 0,
  	/*irq                  */ b_via_1_irq
  };
  
  static READ8_HANDLER( b_via_0_ca2_r )
  {
  	return 0;
  }
  
  static WRITE8_HANDLER( b_via_0_ca2_w )
  {
  }
  
  static void b_via_0_irq (int level)
  {
  	cpunum_set_input_line(0, M6809_IRQ_LINE, level);
  }
  
  static READ8_HANDLER( b_via_0_pb_r )
  {
  	return pbus;
  }
  
  static WRITE8_HANDLER( b_via_0_pa_w )
  {
  	if ((data & 0x08) == 0)
  		cpunum_set_input_line(1, INPUT_LINE_RESET, ASSERT_LINE);
  	else
  		cpunum_set_input_line(1, INPUT_LINE_RESET, CLEAR_LINE);
  
  	if ((data & 0x04) == 0)
  	{
  		switch (data & 0x03)
  		{
  		case 0:
  			pbus = input_port_0_r(0);
  			break;
  		case 1:
  			pbus = input_port_1_r(0) | (input_port_2_r(0) << 4);
  			break;
  		case 2:
  			pbus = input_port_3_r(0);
  			break;
  		case 3:
  			pbus = 0xff;
  			break;
  		}
  	}
  }
  
  static WRITE8_HANDLER( b_via_0_pb_w )
  {
  	pbus = data;
  }
  
  static void b_via_1_irq (int level)
  {
  	cpunum_set_input_line(1, M6809_IRQ_LINE, level);
  }
  
  static READ8_HANDLER( b_via_1_pa_r )
  {
  	return pbus;
  }
  
  static READ8_HANDLER( b_via_1_pb_r )
  {
  	return 0xff;
  }
  
  static WRITE8_HANDLER( b_via_1_pa_w )
  {
  	pbus = data;
  }
  
  static WRITE8_HANDLER( b_via_1_pb_w )
  {
  }
  
  DRIVER_INIT( beezer )
  {
  	via_config(0, &b_via_0_interface);
  	via_config(1, &b_via_1_interface);
  	via_reset();
  	pbus = 0;
  }
  
  WRITE8_HANDLER( beezer_bankswitch_w )
  {
  	if ((data & 0x07) == 0)
  	{
  		memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0xc600, 0xc7ff, 0, 0, watchdog_reset_w);
  		memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0xc800, 0xc9ff, 0, 0, beezer_map_w);
  		memory_install_read8_handler(0, ADDRESS_SPACE_PROGRAM, 0xca00, 0xcbff, 0, 0, beezer_line_r);
  		memory_install_read8_handler(0, ADDRESS_SPACE_PROGRAM, 0xce00, 0xcfff, 0, 0, via_0_r);
  		memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0xce00, 0xcfff, 0, 0, via_0_w);
  	}
  	else
  	{
  		UINT8 *rom = memory_region(REGION_CPU1) + 0x10000;
  		memory_install_read8_handler(0, ADDRESS_SPACE_PROGRAM, 0xc000, 0xcfff, 0, 0, MRA8_BANK1);
  		memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0xc000, 0xcfff, 0, 0, MWA8_BANK1);
  		memory_set_bankptr(1, rom + (data & 0x07) * 0x2000 + ((data & 0x08) ? 0x1000: 0));
  	}
  }
  
  
  