/*

	Sharp X68000 header

*/

#define GFX16     0
#define GFX256    1
#define GFX65536  2

enum
{
	MFP_IRQ_GPIP0 = 0,
	MFP_IRQ_GPIP1,
	MFP_IRQ_GPIP2,
	MFP_IRQ_GPIP3,
	MFP_IRQ_TIMERD,
	MFP_IRQ_TIMERC,
	MFP_IRQ_GPIP4,
	MFP_IRQ_GPIP5,
	MFP_IRQ_TIMERB,
	MFP_IRQ_TX_ERROR,
	MFP_IRQ_TX_EMPTY,
	MFP_IRQ_RX_ERROR,
	MFP_IRQ_RX_FULL,
	MFP_IRQ_TIMERA,
	MFP_IRQ_GPIP6,
	MFP_IRQ_GPIP7
};  // MC68901 IRQ priority levels

struct x68k_system
{
	struct
	{
		int sram_writeprotect;
		int monitor;
		int contrast;
		int keyctrl;
	} sysport;
	struct
	{
		int led_ctrl[4];
		int led_eject[4];
		int eject[4];
		int motor[4];
		int media_density[4];
		int disk_inserted[4];
		int selected_drive;
		int drq_state;
	} fdc;
	struct
	{
		int ioc7;  // "Function B operation of joystick # one option"
		int ioc6;  // "Function A operation of joystick # one option"
		int joy1_enable;  // IOC4
		int joy2_enable;  // IOC5
	} joy;
	struct
	{
		int rate;  // ADPCM sample rate
		int pan;  // ADPCM output switch
	} adpcm;
	struct
	{
		int gpdr;  // [0]  GPIP data register.  Typically all inputs.
		int aer;   // [1]  GPIP active edge register.  Determines on which transition an IRQ is triggered.  0 = 1->0
		int ddr;   // [2]  GPIP data direction register.  Determines which GPIP bits are inputs (0) or outputs (1)
		int iera;  // [3]  Interrupt enable register A.
		int ierb;  // [4]  Interrupt enable register B.
		int ipra;  // [5]  Interrupt pending register A.
		int iprb;  // [6]  Interrupt pending register B.
		int isra;  // [7]  Interrupt in-service register A.
		int isrb;  // [8]  Interrupt in-service register B.
		int imra;  // [9]  Interrupt mask register A.
		int imrb;  // [10] Interrupt mask register B.
		int vr;    // [11] Vector register
		int tacr;  // [12] Timer A control register
		int tbcr;  // [13] Timer B control register
		int tcdcr; // [14] Timer C & D control register
		int tadr;  // [15] Timer A data register
		int tbdr;  // [16] Timer B data register
		int tcdr;  // [17] Timer C data register
		int tddr;  // [18] Timer D data register
		int scr;   // [19] Synchronous character register
		int ucr;   // [20] USART control register
		int rsr;   // [21] Receiver status register
		int tsr;   // [22] Transmitter status register
		int udr;   // [23] USART data register
		struct
		{
			int counter;
			int prescaler;
		} timer[4];
		struct
		{
			unsigned char recv_buffer;
			unsigned char send_buffer;
			int recv_enable;
			int send_enable;
		} usart;
		int vector;
		int irqline;
		int eoi_mode;
		int current_irq;
		unsigned char gpio;
	} mfp;  // MC68901 Multifunction Peripheral (4MHz)
	struct
	{
		unsigned short reg[24];  // registers
		int operation;  // operation port (0xe80481)
		int vblank;  // 1 if in VBlank
		int hblank;  // 1 if in HBlank
		int height;
		int width;
		int visible_height;
		int visible_width;
		int hshift;
		int vshift;
		int video_width;  // horizontal total (in pixels)
		int video_height; // vertical total
		int bg_visible_height;
		int bg_visible_width;
		int bg_hshift;
		int bg_vshift;
		int interlace;  // 1024 vertical resolution is interlaced
	} crtc;  // CRTC
	struct
	{   // video controller at 0xe82000
		unsigned short text_pal[0x100];
		unsigned short gfx_pal[0x100];
		unsigned short reg[3];
		int text_pri;
		int sprite_pri;
		int gfx_pri;
		int gfxlayer_pri[4];  // block displayed for each priority level
		int tile8_dirty[1024];
		int tile16_dirty[256];
	} video;
	struct
	{
		int delay;  // keypress delay after initial press
		int repeat; // keypress repeat rate
		int enabled;  // keyboard enabled?
		unsigned char led_status;  // keyboard LED status
		unsigned char buffer[16];
		int headpos;  // scancodes are added here
		int tailpos;  // scancodes are read from here
		int keynum;  // number of scancodes in buffer
		int keytime[0x80];  // time until next keypress
		int keyon[0x80];  // is 1 if key is pressed, used to determine if the key state has changed from 1 to 0
		int last_pressed;  // last key pressed, for repeat key handling
	} keyboard;
	struct
	{
		int irqstatus;
		int fdcvector;
		int fddvector;
		int hdcvector;
		int prnvector;
	} ioc;
	struct
	{
		int inputtype;  // determines which input is to be received
		int irqactive;  // non-zero if IRQ is being serviced
		char last_mouse_x;  // previous mouse x-axis value
		char last_mouse_y;  // previous mouse y-axis value
		int bufferempty;  // non-zero if buffer is empty
	} mouse;
};

/*
TIMER_CALLBACK(mfp_timer_a_callback);
TIMER_CALLBACK(mfp_timer_b_callback);
TIMER_CALLBACK(mfp_timer_c_callback);
TIMER_CALLBACK(mfp_timer_d_callback);
void mfp_trigger_irq(int);
*/
TIMER_CALLBACK(x68k_crtc_raster_irq);
TIMER_CALLBACK(x68k_crtc_vblank_irq);
TIMER_CALLBACK(x68k_hsync);

PALETTE_INIT( x68000 );
READ16_HANDLER( x68k_spritereg_r );
WRITE16_HANDLER( x68k_spritereg_w );
READ16_HANDLER( x68k_spriteram_r );
WRITE16_HANDLER( x68k_spriteram_w );
WRITE16_HANDLER( x68k_crtc_w );
READ16_HANDLER( x68k_crtc_r );
WRITE16_HANDLER( x68k_gvram_w );
READ16_HANDLER( x68k_gvram_r );
WRITE16_HANDLER( x68k_tvram_w );
READ16_HANDLER( x68k_tvram_r );
VIDEO_UPDATE( x68000 );
VIDEO_START( x68000 );