/* * The schematics don't seem to make a lot of sense when it * comes to the video timing chain:: * * * there are clear typos -- what is H132??? * * there are two HBLANK/HSYNC periods as the horizontal * chain is drawn, which would give an alternating long * line followed by a much shorter one. This cannot be right * * the carry-out/load circuit on LS161@J8 is superflous * * These values also give a frame rate of about 45Hz, which is * probably too low. I suspect that screen is not really * 512 pixels wide -- most likely 384, which would give 60Hz * * Some of the graphics, like the starfield, is clocked with the * 12MHz signal, effecitvely doubling the horizontal resolution */ #define STARSHP1_MASTER_CLOCK (12096000) #define STARSHP1_CPU_CLOCK (STARSHP1_MASTER_CLOCK / 16) #define STARSHP1_PIXEL_CLOCK (STARSHP1_MASTER_CLOCK / 2) #define STARSHP1_HTOTAL (0x200) #define STARSHP1_HBEND (0x000) #define STARSHP1_HBSTART (0x200) #define STARSHP1_VTOTAL (0x106) #define STARSHP1_VBEND (0x000) #define STARSHP1_VBSTART (0x0f0) /*----------- defined in drivers/starshp1.c -----------*/ extern int starshp1_attract; /*----------- defined in video/starshp1.c -----------*/ extern UINT8 *starshp1_playfield_ram; extern UINT8 *starshp1_hpos_ram; extern UINT8 *starshp1_vpos_ram; extern UINT8 *starshp1_obj_ram; extern int starshp1_ship_explode; extern int starshp1_ship_picture; extern int starshp1_ship_hoffset; extern int starshp1_ship_voffset; extern int starshp1_ship_size; extern int starshp1_circle_hpos; extern int starshp1_circle_vpos; extern int starshp1_circle_size; extern int starshp1_circle_mod; extern int starshp1_circle_kill; extern int starshp1_phasor; extern int starshp1_collision_latch; extern int starshp1_starfield_kill; extern int starshp1_mux; extern int starshp1_inverse; READ8_HANDLER( starshp1_rng_r ); WRITE8_HANDLER( starshp1_sspic_w ); WRITE8_HANDLER( starshp1_ssadd_w ); WRITE8_HANDLER( starshp1_playfield_w ); PALETTE_INIT( starshp1 ); VIDEO_UPDATE( starshp1 ); VIDEO_EOF( starshp1 ); VIDEO_START( starshp1 );