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/*************************************************************************
Jaleco Exerion
*************************************************************************/
#define EXERION_MASTER_CLOCK (XTAL_19_968MHz) /* verified on pcb */
#define EXERION_CPU_CLOCK (EXERION_MASTER_CLOCK / 6)
#define EXERION_AY8910_CLOCK (EXERION_CPU_CLOCK / 2)
#define EXERION_PIXEL_CLOCK (EXERION_MASTER_CLOCK / 3)
#define EXERION_HCOUNT_START (0x58)
#define EXERION_HTOTAL (512-EXERION_HCOUNT_START)
#define EXERION_HBEND (12*8) /* ?? */
#define EXERION_HBSTART (52*8) /* ?? */
#define EXERION_VTOTAL (256)
#define EXERION_VBEND (16)
#define EXERION_VBSTART (240)
class exerion_state : public driver_device
{
public:
exerion_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag) { }
/* memory pointers */
UINT8 * m_main_ram;
UINT8 * m_videoram;
UINT8 * m_spriteram;
size_t m_videoram_size;
size_t m_spriteram_size;
/* video-related */
UINT8 m_cocktail_flip;
UINT8 m_char_palette;
UINT8 m_sprite_palette;
UINT8 m_char_bank;
UINT16 *m_background_gfx[4];
UINT8 *m_background_mixer;
UINT8 m_background_latches[13];
/* protection? */
UINT8 m_porta;
UINT8 m_portb;
/* devices */
device_t *m_maincpu;
};
/*----------- defined in video/exerion.c -----------*/
PALETTE_INIT( exerion );
VIDEO_START( exerion );
SCREEN_UPDATE( exerion );
WRITE8_HANDLER( exerion_videoreg_w );
WRITE8_HANDLER( exerion_video_latch_w );
READ8_HANDLER( exerion_video_timing_r );
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