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315_5124.c: Refactored sprite handling, fixes status bar on Tarzan for gaemgear. Removed m_collission_buffer member variable. Tweaked game gear timing to fix glitches in status bar of Chicago Syndicate for gamegear. [Enik Land]

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This commit is contained in:
Wilbert Pol 2014-09-28 15:30:55 +00:00
parent ca3deae576
commit 253a641a63
2 changed files with 147 additions and 127 deletions
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255
src/emu/video/315_5124.c
View File

@ -13,6 +13,7 @@ To do:
- Display mode 1 (text)
- Display mode 3 (multicolor)
- Sprite doubling bug of the 315-5124 chip
SMS Display Timing
@ -66,13 +67,11 @@ PAL frame timing
#define VINT_HPOS 24
#define VINT_FLAG_HPOS 24
#define HINT_HPOS 26
#define NMI_HPOS 28
#define NMI_HPOS 28 /* not verified */
#define VCOUNT_CHANGE_HPOS 23
#define SPROVR_HPOS 24
#define SPRCOL_BASEHPOS 59
#define X_SCROLL_HPOS 21
#define DISPLAY_DISABLED_HPOS 24 /* not verified, works if above 18 (for 'pstrike2') and below 25 (for 'fantdizzy') */
#define SPR_PATTERN_HPOS 26 /* not verified, needed for 'backtof3' (SMS PAL game) title screen */
#define DISPLAY_CB_HPOS 2 /* fixes 'roadrash' (SMS game) title scrolling, due to line counter reload timing */
#define DRAW_TIME_GG 94 /* 9 + 2 + 14 + 8 + 13 + 96/2 */
@ -162,12 +161,13 @@ sega315_5124_device::sega315_5124_device(const machine_config &mconfig, const ch
, m_pause_cb(*this)
, m_space_config("videoram", ENDIANNESS_LITTLE, 8, 14, 0, NULL, *ADDRESS_MAP_NAME(sega315_5124))
, m_palette(*this, "palette")
, m_xscroll_hpos(X_SCROLL_HPOS_5124)
{
}
sega315_5124_device::sega315_5124_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, UINT8 cram_size, UINT8 palette_offset, bool supports_224_240, const char *shortname, const char *source)
: device_t( mconfig, type, name, tag, owner, clock, shortname, source)
sega315_5124_device::sega315_5124_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, UINT8 cram_size, UINT8 palette_offset, bool supports_224_240, const char *shortname, const char *source, int xscroll_hpos)
: device_t( mconfig, type, name, tag, owner, clock, shortname, __FILE__)
, device_memory_interface(mconfig, *this)
, device_video_interface(mconfig, *this)
, m_cram_size( cram_size )
@ -178,18 +178,19 @@ sega315_5124_device::sega315_5124_device(const machine_config &mconfig, device_t
, m_pause_cb(*this)
, m_space_config("videoram", ENDIANNESS_LITTLE, 8, 14, 0, NULL, *ADDRESS_MAP_NAME(sega315_5124))
, m_palette(*this, "palette")
, m_xscroll_hpos(xscroll_hpos)
{
}
sega315_5246_device::sega315_5246_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: sega315_5124_device( mconfig, SEGA315_5246, "Sega 315-5246 VDP", tag, owner, clock, SEGA315_5124_CRAM_SIZE, 0, true, "sega315_5246", __FILE__)
: sega315_5124_device( mconfig, SEGA315_5246, "Sega 315-5246 VDP", tag, owner, clock, SEGA315_5124_CRAM_SIZE, 0, true, "sega315_5246", __FILE__, X_SCROLL_HPOS_5124)
{
}
sega315_5378_device::sega315_5378_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: sega315_5124_device( mconfig, SEGA315_5378, "Sega 315-5378", tag, owner, clock, SEGA315_5378_CRAM_SIZE, 0x10, true, "sega315_5378", __FILE__)
: sega315_5124_device( mconfig, SEGA315_5378, "Sega 315-5378", tag, owner, clock, SEGA315_5378_CRAM_SIZE, 0x10, true, "sega315_5378", __FILE__, X_SCROLL_HPOS_5378)
{
}
@ -407,7 +408,6 @@ void sega315_5124_device::process_line_timer()
/* copy current values in case they are not changed until latch time */
m_display_disabled = !(m_reg[0x01] & 0x40);
m_reg6copy = m_reg[0x06];
m_reg8copy = m_reg[0x08];
vpos_limit -= m_frame_timing[BOTTOM_BLANKING];
@ -690,12 +690,8 @@ WRITE8_MEMBER( sega315_5124_device::register_write )
if (m_screen->hpos() <= DISPLAY_DISABLED_HPOS)
m_display_disabled = !(m_reg[0x01] & 0x40);
break;
case 6:
if (m_screen->hpos() <= SPR_PATTERN_HPOS)
m_reg6copy = m_reg[0x06];
break;
case 8:
if (m_screen->hpos() <= X_SCROLL_HPOS)
if (m_screen->hpos() <= m_xscroll_hpos)
m_reg8copy = m_reg[0x08];
}
@ -886,6 +882,22 @@ void sega315_5124_device::select_sprites( int line )
{
int max_sprites;
/* At this point the VDP vcount still doesn't refer the new line,
because the logical start point is slightly shifted on the scanline */
int parse_line = line - 1;
/* Check if SI is set */
m_sprite_height = (m_reg[0x01] & 0x02) ? 16 : 8;
/* Check if MAG is set */
m_sprite_zoom = (m_reg[0x01] & 0x01) ? 2 : 1;
if (m_sprite_zoom == 2)
{
/* Divide before use the value for comparison, same later with sprite_y, or
else an off-by-one bug could occur, as seen with Tarzan, for Game Gear */
parse_line >>= 1;
}
m_sprite_count = 0;
if ( m_vdp_mode == 0 || m_vdp_mode == 2 )
@ -895,30 +907,54 @@ void sega315_5124_device::select_sprites( int line )
max_sprites = 4;
m_sprite_base = ((m_reg[0x05] & 0x7f) << 7);
m_sprite_height = 8;
if (m_reg[0x01] & 0x02) /* Check if SI is set */
m_sprite_height = m_sprite_height * 2;
if (m_reg[0x01] & 0x01) /* Check if MAG is set */
m_sprite_height = m_sprite_height * 2;
for (int sprite_index = 0; (sprite_index < 32 * 4) && (m_sprite_count <= max_sprites); sprite_index += 4)
{
int sprite_y = space().read_byte(m_sprite_base + sprite_index);
if (sprite_y == 0xd0)
break;
sprite_y += 1;
if (sprite_y > 240)
if (sprite_y >= 240)
{
sprite_y -= 256;
}
if ((line >= sprite_y) && (line < (sprite_y + m_sprite_height)))
if (m_sprite_zoom > 1)
{
sprite_y >>= 1;
}
if ((parse_line >= sprite_y) && (parse_line < (sprite_y + m_sprite_height)))
{
if (m_sprite_count < max_sprites)
{
m_selected_sprite[m_sprite_count] = sprite_index;
int sprite_x = space().read_byte( m_sprite_base + sprite_index + 1 );
int sprite_tile_selected = space().read_byte( m_sprite_base + sprite_index + 2 );
UINT8 flags = space().read_byte( m_sprite_base + sprite_index + 3 );
if (flags & 0x80)
sprite_x -= 32;
int sprite_line = parse_line - sprite_y;
if (m_reg[0x01] & 0x01)
sprite_line >>= 1;
if (m_reg[0x01] & 0x02)
{
sprite_tile_selected &= 0xfc;
if (sprite_line > 0x07)
{
sprite_tile_selected += 1;
sprite_line -= 8;
}
}
m_sprite_x[m_sprite_count] = sprite_x;
m_sprite_tile_selected[m_sprite_count] = sprite_tile_selected;
m_sprite_flags[m_sprite_count] = flags;
m_sprite_pattern_line[m_sprite_count] = ((m_reg[0x06] & 0x07) << 11) + sprite_line;
}
m_sprite_count++;
}
@ -931,26 +967,55 @@ void sega315_5124_device::select_sprites( int line )
max_sprites = 8;
m_sprite_base = ((m_reg[0x05] << 7) & 0x3f00);
m_sprite_height = (m_reg[0x01] & 0x02) ? 16 : 8;
m_sprite_zoom = (m_reg[0x01] & 0x01) ? 2 : 1;
for (int sprite_index = 0; (sprite_index < 64) && (m_sprite_count <= max_sprites); sprite_index++)
{
int sprite_y = space().read_byte(m_sprite_base + sprite_index);
if (m_y_pixels == 192 && sprite_y == 0xd0)
break;
sprite_y += 1; /* sprite y position starts at line 1 */
if (sprite_y > 240)
if (sprite_y >= 240)
{
sprite_y -= 256; /* wrap from top if y position is > 240 */
}
if ((line >= sprite_y) && (line < (sprite_y + m_sprite_height * m_sprite_zoom)))
if (m_sprite_zoom > 1)
{
sprite_y >>= 1;
}
if ((parse_line >= sprite_y) && (parse_line < (sprite_y + m_sprite_height)))
{
if (m_sprite_count < max_sprites)
{
m_selected_sprite[m_sprite_count] = sprite_index;
int sprite_x = space().read_byte( m_sprite_base + 0x80 + (sprite_index << 1) );
int sprite_tile_selected = space().read_byte( m_sprite_base + 0x81 + (sprite_index << 1) );
if (m_reg[0x00] & 0x08)
{
sprite_x -= 0x08; /* sprite shift */
}
if (m_reg[0x06] & 0x04)
{
sprite_tile_selected += 256; /* pattern table select */
}
if (m_reg[0x01] & 0x02)
{
sprite_tile_selected &= 0x01fe; /* force even index */
}
int sprite_line = parse_line - sprite_y;
if (sprite_line > 0x07)
{
sprite_tile_selected += 1;
}
m_sprite_x[m_sprite_count] = sprite_x;
m_sprite_tile_selected[m_sprite_count] = sprite_tile_selected;
m_sprite_pattern_line[m_sprite_count] = ((sprite_line & 0x07) << 2);
}
m_sprite_count++;
}
@ -975,51 +1040,24 @@ void sega315_5124_device::draw_sprites_mode4( int *line_buffer, int *priority_se
{
bool sprite_col_occurred = false;
int sprite_col_x = SEGA315_5124_WIDTH;
UINT8 collision_buffer[SEGA315_5124_WIDTH];
if (m_display_disabled || m_sprite_count == 0)
return;
memset(m_collision_buffer, 0, SEGA315_5124_WIDTH);
memset(collision_buffer, 0, SEGA315_5124_WIDTH);
/* Draw sprite layer */
for (int sprite_buffer_index = m_sprite_count - 1; sprite_buffer_index >= 0; sprite_buffer_index--)
{
int sprite_index = m_selected_sprite[sprite_buffer_index];
int sprite_y = space().read_byte( m_sprite_base + sprite_index ) + 1; /* sprite y position starts at line 1 */
int sprite_x = space().read_byte( m_sprite_base + 0x80 + (sprite_index << 1) );
int sprite_tile_selected = space().read_byte( m_sprite_base + 0x81 + (sprite_index << 1) );
int sprite_x = m_sprite_x[sprite_buffer_index];
int sprite_tile_selected = m_sprite_tile_selected[sprite_buffer_index];
UINT16 sprite_pattern_line = m_sprite_pattern_line[sprite_buffer_index];
if (sprite_y > 240)
{
sprite_y -= 256; /* wrap from top if y position is > 240 */
}
if (m_reg[0x00] & 0x08)
{
sprite_x -= 0x08; /* sprite shift */
}
if (m_reg6copy & 0x04)
{
sprite_tile_selected += 256; /* pattern table select */
}
if (m_reg[0x01] & 0x02)
{
sprite_tile_selected &= 0x01fe; /* force even index */
}
int sprite_line = (line - sprite_y) / m_sprite_zoom;
if (sprite_line > 0x07)
{
sprite_tile_selected += 1;
}
UINT8 bit_plane_0 = space().read_byte(((sprite_tile_selected << 5) + ((sprite_line & 0x07) << 2)) + 0x00);
UINT8 bit_plane_1 = space().read_byte(((sprite_tile_selected << 5) + ((sprite_line & 0x07) << 2)) + 0x01);
UINT8 bit_plane_2 = space().read_byte(((sprite_tile_selected << 5) + ((sprite_line & 0x07) << 2)) + 0x02);
UINT8 bit_plane_3 = space().read_byte(((sprite_tile_selected << 5) + ((sprite_line & 0x07) << 2)) + 0x03);
UINT8 bit_plane_0 = space().read_byte((sprite_tile_selected << 5) + sprite_pattern_line + 0x00);
UINT8 bit_plane_1 = space().read_byte((sprite_tile_selected << 5) + sprite_pattern_line + 0x01);
UINT8 bit_plane_2 = space().read_byte((sprite_tile_selected << 5) + sprite_pattern_line + 0x02);
UINT8 bit_plane_3 = space().read_byte((sprite_tile_selected << 5) + sprite_pattern_line + 0x03);
for (int pixel_x = 0; pixel_x < 8 ; pixel_x++)
{
@ -1065,18 +1103,18 @@ void sega315_5124_device::draw_sprites_mode4( int *line_buffer, int *priority_se
priority_selected[pixel_plot_x + 1] = pen_selected;
}
}
if (m_collision_buffer[pixel_plot_x] != 1)
if (collision_buffer[pixel_plot_x] != 1)
{
m_collision_buffer[pixel_plot_x] = 1;
collision_buffer[pixel_plot_x] = 1;
}
else
{
sprite_col_occurred = true;
sprite_col_x = MIN(sprite_col_x, pixel_plot_x);
}
if (m_collision_buffer[pixel_plot_x + 1] != 1)
if (collision_buffer[pixel_plot_x + 1] != 1)
{
m_collision_buffer[pixel_plot_x + 1] = 1;
collision_buffer[pixel_plot_x + 1] = 1;
}
else
{
@ -1107,9 +1145,9 @@ void sega315_5124_device::draw_sprites_mode4( int *line_buffer, int *priority_se
priority_selected[pixel_plot_x] = pen_selected;
}
}
if (m_collision_buffer[pixel_plot_x] != 1)
if (collision_buffer[pixel_plot_x] != 1)
{
m_collision_buffer[pixel_plot_x] = 1;
collision_buffer[pixel_plot_x] = 1;
}
else
{
@ -1131,47 +1169,24 @@ void sega315_5124_device::draw_sprites_tms9918_mode( int *line_buffer, int line
{
bool sprite_col_occurred = false;
int sprite_col_x = SEGA315_5124_WIDTH;
UINT16 sprite_pattern_base;
UINT8 collision_buffer[SEGA315_5124_WIDTH];
if (m_display_disabled || m_sprite_count == 0)
return;
sprite_pattern_base = ((m_reg6copy & 0x07) << 11);
memset(m_collision_buffer, 0, SEGA315_5124_WIDTH);
memset(collision_buffer, 0, SEGA315_5124_WIDTH);
/* Draw sprite layer */
for (int sprite_buffer_index = m_sprite_count - 1; sprite_buffer_index >= 0; sprite_buffer_index--)
{
int sprite_index = m_selected_sprite[sprite_buffer_index];
int sprite_y = space().read_byte( m_sprite_base + sprite_index ) + 1;
int sprite_x = space().read_byte( m_sprite_base + sprite_index + 1 );
UINT8 flags = space().read_byte( m_sprite_base + sprite_index + 3 );
int sprite_x = m_sprite_x[sprite_buffer_index];
UINT8 flags = m_sprite_flags[sprite_buffer_index];
int pen_selected = m_palette_offset + ( flags & 0x0f );
if (sprite_y > 240)
sprite_y -= 256;
int sprite_tile_selected = m_sprite_tile_selected[sprite_buffer_index];
UINT16 sprite_pattern_line = m_sprite_pattern_line[sprite_buffer_index];
if (flags & 0x80)
sprite_x -= 32;
int sprite_tile_selected = space().read_byte( m_sprite_base + sprite_index + 2 );
int sprite_line = line - sprite_y;
if (m_reg[0x01] & 0x01)
sprite_line >>= 1;
if (m_reg[0x01] & 0x02)
{
sprite_tile_selected &= 0xfc;
if (sprite_line > 0x07)
{
sprite_tile_selected += 1;
sprite_line -= 8;
}
}
UINT8 pattern = space().read_byte( sprite_pattern_base + sprite_tile_selected * 8 + sprite_line );
UINT8 pattern = space().read_byte( sprite_pattern_line + sprite_tile_selected * 8 );
for (int pixel_x = 0; pixel_x < 8; pixel_x++)
{
@ -1188,9 +1203,9 @@ void sega315_5124_device::draw_sprites_tms9918_mode( int *line_buffer, int line
{
line_buffer[pixel_plot_x] = m_current_palette[pen_selected];
if (m_collision_buffer[pixel_plot_x] != 1)
if (collision_buffer[pixel_plot_x] != 1)
{
m_collision_buffer[pixel_plot_x] = 1;
collision_buffer[pixel_plot_x] = 1;
}
else
{
@ -1200,9 +1215,9 @@ void sega315_5124_device::draw_sprites_tms9918_mode( int *line_buffer, int line
line_buffer[pixel_plot_x+1] = m_current_palette[pen_selected];
if (m_collision_buffer[pixel_plot_x + 1] != 1)
if (collision_buffer[pixel_plot_x + 1] != 1)
{
m_collision_buffer[pixel_plot_x + 1] = 1;
collision_buffer[pixel_plot_x + 1] = 1;
}
else
{
@ -1224,9 +1239,9 @@ void sega315_5124_device::draw_sprites_tms9918_mode( int *line_buffer, int line
{
line_buffer[pixel_plot_x] = m_current_palette[pen_selected];
if (m_collision_buffer[pixel_plot_x] != 1)
if (collision_buffer[pixel_plot_x] != 1)
{
m_collision_buffer[pixel_plot_x] = 1;
collision_buffer[pixel_plot_x] = 1;
}
else
{
@ -1237,11 +1252,11 @@ void sega315_5124_device::draw_sprites_tms9918_mode( int *line_buffer, int line
}
}
if (m_reg[0x01] & 0x02)
if (m_sprite_height == 16)
{
sprite_tile_selected += 2;
pattern = space().read_byte( sprite_pattern_base + sprite_tile_selected * 8 + sprite_line );
sprite_x += (m_reg[0x01] & 0x01 ? 16 : 8);
pattern = space().read_byte( sprite_pattern_line + sprite_tile_selected * 8 );
sprite_x += (m_sprite_zoom == 2 ? 16 : 8);
for (int pixel_x = 0; pixel_x < 8; pixel_x++)
{
@ -1258,9 +1273,9 @@ void sega315_5124_device::draw_sprites_tms9918_mode( int *line_buffer, int line
{
line_buffer[pixel_plot_x] = m_current_palette[pen_selected];
if (m_collision_buffer[pixel_plot_x] != 1)
if (collision_buffer[pixel_plot_x] != 1)
{
m_collision_buffer[pixel_plot_x] = 1;
collision_buffer[pixel_plot_x] = 1;
}
else
{
@ -1270,9 +1285,9 @@ void sega315_5124_device::draw_sprites_tms9918_mode( int *line_buffer, int line
line_buffer[pixel_plot_x+1] = m_current_palette[pen_selected];
if (m_collision_buffer[pixel_plot_x + 1] != 1)
if (collision_buffer[pixel_plot_x + 1] != 1)
{
m_collision_buffer[pixel_plot_x + 1] = 1;
collision_buffer[pixel_plot_x + 1] = 1;
}
else
{
@ -1294,9 +1309,9 @@ void sega315_5124_device::draw_sprites_tms9918_mode( int *line_buffer, int line
{
line_buffer[pixel_plot_x] = m_current_palette[pen_selected];
if (m_collision_buffer[pixel_plot_x] != 1)
if (collision_buffer[pixel_plot_x] != 1)
{
m_collision_buffer[pixel_plot_x] = 1;
collision_buffer[pixel_plot_x] = 1;
}
else
{
@ -1832,7 +1847,6 @@ void sega315_5124_device::device_start()
save_item(NAME(m_status));
save_item(NAME(m_pending_status));
save_item(NAME(m_pending_sprcol_x));
save_item(NAME(m_reg6copy));
save_item(NAME(m_reg8copy));
save_item(NAME(m_reg9copy));
save_item(NAME(m_addrmode));
@ -1851,12 +1865,14 @@ void sega315_5124_device::device_start()
save_item(NAME(m_reg));
save_item(NAME(m_current_palette));
save_pointer(NAME(m_line_buffer), 256 * 5);
save_item(NAME(m_collision_buffer));
save_item(NAME(m_tmpbitmap));
save_item(NAME(m_y1_bitmap));
save_item(NAME(m_draw_time));
save_item(NAME(m_sprite_base));
save_item(NAME(m_selected_sprite));
save_item(NAME(m_sprite_pattern_line));
save_item(NAME(m_sprite_tile_selected));
save_item(NAME(m_sprite_x));
save_item(NAME(m_sprite_flags));
save_item(NAME(m_sprite_count));
save_item(NAME(m_sprite_height));
save_item(NAME(m_sprite_zoom));
@ -1881,7 +1897,6 @@ void sega315_5124_device::device_reset()
m_pending_status = 0;
m_pending_sprcol_x = 0;
m_pending_reg_write = 0;
m_reg6copy = 0;
m_reg8copy = 0;
m_reg9copy = 0;
m_addrmode = 0;

19
src/emu/video/315_5124.h
View File

@ -59,7 +59,7 @@ class sega315_5124_device : public device_t,
public:
// construction/destruction
sega315_5124_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
sega315_5124_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, UINT8 cram_size, UINT8 palette_offset, bool supports_224_240, const char *shortname, const char *source);
sega315_5124_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, UINT8 cram_size, UINT8 palette_offset, bool supports_224_240, const char *shortname, const char *source, int xscroll_hpos = X_SCROLL_HPOS_5124);
static void set_signal_type(device_t &device, bool is_pal) { downcast<sega315_5124_device &>(device).m_is_pal = is_pal; }
template<class _Object> static devcb_base &set_int_callback(device_t &device, _Object object) { return downcast<sega315_5124_device &>(device).m_int_cb.set_callback(object); }
@ -87,6 +87,9 @@ public:
virtual void set_sega315_5124_compatibility_mode( bool sega315_5124_compatibility_mode ) { };
protected:
static const int X_SCROLL_HPOS_5124 = 21;
static const int X_SCROLL_HPOS_5378 = 35; // Not verified
void set_display_settings();
virtual void update_palette();
virtual void cram_write(UINT8 data);
@ -114,7 +117,6 @@ protected:
UINT8 m_reg[16]; /* All the registers */
UINT8 m_status; /* Status register */
UINT8 m_pending_status; /* Pending status flags */
UINT8 m_reg6copy; /* Internal copy of register 6 (Sprite Patterns) */
UINT8 m_reg8copy; /* Internal copy of register 8 (X-Scroll) */
UINT8 m_reg9copy; /* Internal copy of register 9 (Y-Scroll) */
UINT8 m_addrmode; /* Type of VDP action */
@ -136,12 +138,14 @@ protected:
const UINT8 *m_frame_timing;
bitmap_rgb32 m_tmpbitmap;
bitmap_ind8 m_y1_bitmap;
UINT8 m_collision_buffer[SEGA315_5124_WIDTH];
UINT8 m_palette_offset;
bool m_supports_224_240;
bool m_display_disabled;
UINT16 m_sprite_base;
int m_selected_sprite[8];
UINT16 m_sprite_pattern_line[8];
int m_sprite_tile_selected[8];
int m_sprite_x[8];
UINT8 m_sprite_flags[8];
int m_sprite_count;
int m_sprite_height;
int m_sprite_zoom;
@ -151,9 +155,9 @@ protected:
sms compatibility mode. */
int *m_line_buffer;
int m_current_palette[32];
bool m_is_pal; /* false = NTSC, true = PAL */
devcb_write_line m_int_cb; /* Interrupt callback function */
devcb_write_line m_pause_cb; /* Pause callback function */
bool m_is_pal; /* false = NTSC, true = PAL */
devcb_write_line m_int_cb; /* Interrupt callback function */
devcb_write_line m_pause_cb; /* Pause callback function */
emu_timer *m_display_timer;
emu_timer *m_hint_timer;
emu_timer *m_vint_timer;
@ -176,6 +180,7 @@ protected:
static const device_timer_id TIMER_FLAGS = 7;
required_device<palette_device> m_palette;
const int m_xscroll_hpos;
};