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https://github.com/holub/mame
synced 2025-07-05 09:57:47 +03:00
some cleanup+notes and added preliminary bullet hw
This commit is contained in:
Michaël Banaan Ananas
parent
a0dfd5f6cb
commit
2bd232bfd4
@ -7,21 +7,26 @@ Taken from an untested board.
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1K byte files were 2708 or equivalent.
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512 byte file is the 82S130 colour PROM.
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This is not a direct pirate of Galaxians as you might think from the name.
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The game uses a Signetics 2650A CPU with three 40-pin 2636 chips. I have
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no idea what 2636's are but I am hoping they are something to do with the
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sound since the board has no apparent sound circuitry. The video hardware
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looks like it's similar to Galaxians (2 x 2114, 2 x 2101, 2 x EPROM) but
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there is no attack RAM and the graphics EPROMS are 2708. The graphics EPROMS
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do contain Galaxian-like graphics...
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This is not a direct pirate of Galaxian as you might think from the name.
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The game uses a Signetics 2650A CPU with three 40-pin 2636 chips, which are
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responsible for sound and some video functions.
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Other than that, the video hardware looks like it's similar to Galaxian
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(2 x 2114, 2 x 2101, 2 x EPROM) but there is no attack RAM and the graphics
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EPROMS are 2708. The graphics EPROMS do contain Galaxian-like graphics...
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Astro Wars (port of Astro Fighter) is on a stripped down board of Galaxia,
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using only one 2636 chip.
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---
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HW seems to have many similarities with quasar.c / cvs.c
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TODO:
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- galaxia level 2 collision detection
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- better collision detection
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- colors are probably wrong
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- astrowar I/O
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- starfield hardware?
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- eventually merge/share with quasar.c or cvs.c?
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*/
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@ -41,11 +46,11 @@ public:
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UINT8 m_collision;
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UINT8 m_scroll;
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UINT8 *m_video;
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UINT8 *m_bullet;
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UINT8 *m_color;
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};
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static SCREEN_UPDATE_IND16( galaxia )
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{
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galaxia_state *state = screen.machine().driver_data<galaxia_state>();
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@ -55,18 +60,41 @@ static SCREEN_UPDATE_IND16( galaxia )
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device_t *s2636_1 = screen.machine().device("s2636_1");
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device_t *s2636_2 = screen.machine().device("s2636_2");
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bitmap.fill(0, cliprect);
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// draw background
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for (x = 0; x < 32; x++)
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{
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// fixed scrolling area
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int y_offs = 0;
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if (x >= 4 && x < 24)
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y_offs = 0xff - state->m_scroll;
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y_offs = state->m_scroll ^ 0xff;
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for (y = 0; y < 32; y++)
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{
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int tile = state->m_video[y << 5 | x];
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drawgfx_opaque(bitmap,cliprect,screen.machine().gfx[0],tile,0,0,0,x*8,(y_offs+y*8)&0xff);
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int color = state->m_color[y << 5 | x];
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drawgfx_transpen(bitmap,cliprect,screen.machine().gfx[0], tile, color, 0, 0, x*8, (y_offs + y*8) & 0xff, 0);
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}
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}
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// draw bullets (guesswork)
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for (y = cliprect.min_y; y <= cliprect.max_y; y++)
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{
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if (state->m_bullet[y])
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{
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int pos = state->m_bullet[y] ^ 0xff;
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if (bitmap.pix16(y, pos))
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{
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// collision with background
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// state->m_collision |= 0xff; * no effect, even if setting all bits.. must be another register?
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}
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else
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{
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// bullet size and color is guessed
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bitmap.pix16(y, pos) = 7;
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bitmap.pix16(y, pos + 1) = 7;
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}
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}
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}
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@ -75,48 +103,43 @@ static SCREEN_UPDATE_IND16( galaxia )
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bitmap_ind16 &s2636_2_bitmap = s2636_update(s2636_2, cliprect);
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/* copy the S2636 images into the main bitmap and check collision */
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for (y = cliprect.min_y; y <= cliprect.max_y; y++)
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{
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int y;
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for (y = cliprect.min_y; y <= cliprect.max_y; y++)
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for (x = cliprect.min_x; x <= cliprect.max_x; x++)
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{
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int x;
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for (x = cliprect.min_x; x <= cliprect.max_x; x++)
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int pixel0 = s2636_0_bitmap.pix16(y, x);
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int pixel1 = s2636_1_bitmap.pix16(y, x);
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int pixel2 = s2636_2_bitmap.pix16(y, x);
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int pixel = pixel0 | pixel1 | pixel2;
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if (S2636_IS_PIXEL_DRAWN(pixel))
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{
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int pixel0 = s2636_0_bitmap.pix16(y, x);
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int pixel1 = s2636_1_bitmap.pix16(y, x);
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int pixel2 = s2636_2_bitmap.pix16(y, x);
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int pixel = pixel0 | pixel1 | pixel2;
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if (S2636_IS_PIXEL_DRAWN(pixel))
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/* S2636 vs. S2636 collision detection */
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if (S2636_IS_PIXEL_DRAWN(pixel0) && S2636_IS_PIXEL_DRAWN(pixel1)) state->m_collision |= 0x01;
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if (S2636_IS_PIXEL_DRAWN(pixel1) && S2636_IS_PIXEL_DRAWN(pixel2)) state->m_collision |= 0x02;
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if (S2636_IS_PIXEL_DRAWN(pixel2) && S2636_IS_PIXEL_DRAWN(pixel0)) state->m_collision |= 0x04;
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/* S2636 vs. background collision detection */
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if (bitmap.pix16(y, x))
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{
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/* S2636 vs. S2636 collision detection */
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if (S2636_IS_PIXEL_DRAWN(pixel0) && S2636_IS_PIXEL_DRAWN(pixel1)) state->m_collision |= 0x01;
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if (S2636_IS_PIXEL_DRAWN(pixel1) && S2636_IS_PIXEL_DRAWN(pixel2)) state->m_collision |= 0x02;
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if (S2636_IS_PIXEL_DRAWN(pixel2) && S2636_IS_PIXEL_DRAWN(pixel0)) state->m_collision |= 0x04;
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/* S2636 vs. background collision detection */
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if (bitmap.pix16(y, x))
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{
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if (S2636_IS_PIXEL_DRAWN(pixel0)) state->m_collision |= 0x10;
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if (S2636_IS_PIXEL_DRAWN(pixel1)) state->m_collision |= 0x20;
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if (S2636_IS_PIXEL_DRAWN(pixel2)) state->m_collision |= 0x40;
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}
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bitmap.pix16(y, x) = S2636_PIXEL_COLOR(pixel);
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// if (S2636_IS_PIXEL_DRAWN(pixel0)) state->m_collision |= 0x10; * problem in level 2
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if (S2636_IS_PIXEL_DRAWN(pixel1)) state->m_collision |= 0x20;
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if (S2636_IS_PIXEL_DRAWN(pixel2)) state->m_collision |= 0x40;
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}
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bitmap.pix16(y, x) = S2636_PIXEL_COLOR(pixel);
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}
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}
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}
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return 0;
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}
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static WRITE8_HANDLER(galaxia_video_w)
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{
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galaxia_state *state = space->machine().driver_data<galaxia_state>();
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space->machine().primary_screen->update_partial(space->machine().primary_screen->vpos());
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// space->machine().primary_screen->update_partial(space->machine().primary_screen->vpos());
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if (cpu_get_reg(&space->device(), S2650_FO))
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{
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state->m_video[offset]=data;
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@ -157,11 +180,11 @@ static READ8_HANDLER(galaxia_collision_clear)
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static ADDRESS_MAP_START( mem_map, AS_PROGRAM, 8 )
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AM_RANGE(0x0000, 0x13ff) AM_ROM
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AM_RANGE(0x1400, 0x14ff) AM_MIRROR(0x6000) AM_RAM // bullet ram?
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AM_RANGE(0x1400, 0x14ff) AM_MIRROR(0x6000) AM_RAM AM_BASE_MEMBER(galaxia_state, m_bullet)
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AM_RANGE(0x1500, 0x15ff) AM_MIRROR(0x6000) AM_DEVREADWRITE("s2636_0", s2636_work_ram_r, s2636_work_ram_w)
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AM_RANGE(0x1600, 0x16ff) AM_MIRROR(0x6000) AM_DEVREADWRITE("s2636_1", s2636_work_ram_r, s2636_work_ram_w)
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AM_RANGE(0x1700, 0x17ff) AM_MIRROR(0x6000) AM_DEVREADWRITE("s2636_2", s2636_work_ram_r, s2636_work_ram_w)
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AM_RANGE(0x1800, 0x1bff) AM_MIRROR(0x6000) AM_READWRITE(galaxia_video_r, galaxia_video_w) AM_BASE_MEMBER(galaxia_state, m_video)
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AM_RANGE(0x1800, 0x1bff) AM_MIRROR(0x6000) AM_READWRITE(galaxia_video_r, galaxia_video_w) AM_BASE_MEMBER(galaxia_state, m_video)
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AM_RANGE(0x1c00, 0x1fff) AM_MIRROR(0x6000) AM_RAM
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AM_RANGE(0x2000, 0x33ff) AM_ROM
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AM_RANGE(0x7214, 0x7214) AM_READ_PORT("IN0")
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@ -174,7 +197,7 @@ static ADDRESS_MAP_START( io_map, AS_IO, 8 )
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AM_RANGE(0x06, 0x06) AM_READ_PORT("IN6")
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AM_RANGE(0xac, 0xac) AM_READ_PORT("IN3")
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AM_RANGE(S2650_CTRL_PORT, S2650_CTRL_PORT) AM_READ(galaxia_collision_r)
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AM_RANGE(S2650_DATA_PORT, S2650_DATA_PORT) AM_READ(galaxia_collision_clear) // ?
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AM_RANGE(S2650_DATA_PORT, S2650_DATA_PORT) AM_READ(galaxia_collision_clear)
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AM_RANGE(S2650_SENSE_PORT, S2650_SENSE_PORT) AM_READ_PORT("SENSE")
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ADDRESS_MAP_END
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