📄 spiders.c
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/***************************************************************************
Spiders driver by K.Wilkins May 1998
Memory map information
----------------------
Main CPU - Read Range
$0000-$1bff Video Memory (bit0)
$4000-$5bff Video Memory (bit1)
$8000-$9bff Video Memory (bit2)
$c000-$c001 6845 CRT Controller (crtc6845)
$c044-$c047 MC6821 PIA 1 (Control input port - all input)
$c048-$c04b MC6821 PIA 2 (Sprite data port - see machine/spiders.c)
$c050-$c053 MC6821 PIA 3 (Sound control - all output)
$c060 Dip Switch 1
$c080 Dip Switch 2
$c0a0 Dip Switch 3
$c100-ffff ROM SPACE
Main CPU - Write Range
$0000-$1bff Video Memory (bit0)
$4000-$5bff Video Memory (bit1)
$8000-$9bff Video Memory (bit2)
$c000-$c001 6845 CRT Controller (crtc6845)
$c044-$c047 MC6821 PIA 1
$c048-$c04b MC6821 PIA 2 (Video port)
$c050-$c053 MC6821 PIA 3
DIP SWITCH 1
------------
1 2 3 4 5 6 7 8 COIN/CREDIT
ON ON ON FREE PLAY
ON ON OFF 1/2
ON OFF ON 1/3
OFF ON ON 2/1
ON OFF OFF 4/5
OFF OFF OFF 1/1
DIP SWITCH 2
------------
1 2 3 4 5 6 7 8
ON ON MODE A A'
ON OFF A B'
OFF ON B A'
OFF OFF B B'
ON ON 14 # OF SPIDERS WHICH LAND TO
ON OFF 20 COMPLETE SPIDER BELT
OFF ON 26
OFF OFF 16
ON 4 # 0F SPARE GUNS
OFF 3
ON ON NONE SCORE FOR BONUS GUN
ON OFF 20K
OFF ON 25K
OFF OFF 15K
ON GIANT SPIDER AFTER FIRST SCREEN
OFF GIANT SPIDER AFTER EVERY SCREEN
PATTERN 1 2 3 4 5 6 7 8 9 10 11 12 13 14
MODE A 27 36 45 54 63 72 81 98 45 54 63 72 81 98 PCS
MODE B 20 27 34 41 48 55 62 69 34 41 48 55 62 69 PCS
MODE A' 1 1 1 3.5 3.5 4 4.5 5 1 3.5 3.5 4 4.5 5 SECONDS
MODE B' .7 .7 .7 2 3 3.2 3.4 4 .7 2 3 2.3 3.4 4 SECONDS
MODE A & B FOR THE NUMBER OF GROWABLE COCOONS
MODE A' & B' FOR THE FREQUENCY OF SPIDERS APPEARANCE
DIP SWITCH 3
------------
1 2 3 4 5 6 7 8
X VIDEO FLIP
ON UPRIGHT
OFF TABLE
SWITCHES 3,4,5 FOR ADJUSTING PICTURE VERTICALLY
SWITCHES 6,7,8 FOR ADJUSTING PICTURE HORIZONTALLY
Unpopulated Switches
--------------------
PS1 (Display Crosshatch) - Connected to PIA1 CB1 via pull-up
PS2 (Coin input, bypass counter) - Connected to PIA1 PA1 via pull-up and invertor
PS3 (Display coin counter) - Connected to PIA1 PA2 via pull-up and invertor
Graphic notes
-------------
Following roms appear to have graphic data
* Mapped in main CPU space
* SP1.BIN - Appears to have some sprites in it.
* SP2.BIN - Appears to have some 16x16 sprites. (Includes the word SIGMA)
* SP3.BIN - Appears to have 2-4 sprites 16x16 - spiders
* SP4.BIN - CPU Code 6809 - Main
SP5.BIN - Some 8x8 and 16x16 tiles/sprites
SP6.BIN - Some 8x8 tiles
SP7.BIN - Tiles/Sprites 8x8
SP8.BIN - Tiles/Sprites 8x8
SP9A.BIN - Tiles/Sprites 8x8
SP9B.BIN - Tiles/Sprites 8x8
SP10A.BIN - Tiles/Sprites 8x8
SP10B.BIN - CPU Code 6802 - Sound
Spiders has a fully bitmapped display and all sprite drawing is handled by the CPU
hence no gfxdecode is done on the sprite ROMS, the CPU accesses them via PIA2.
Screen is arranged in three memory areas with three bits being combined from each
area to produce a 3bit colour send directly to the screen.
$0000-$1bff, $4000-$5bff, $8000-$9bff Bank 0
$2000-$3bff, %6000-$7bff, $a000-$bbff Bank 1
The game normally runs from bank 0 only, but when lots of screen changes are required
e.g spider or explosion then it implements a double buffered scheme with bank 1.
The ram bank for screens is continuous from $0000-$bfff but is physically arranged
as 3 banks of 16k (8x16k DRAM!). The CPU stack/variables etc are stored in the unused
spaces between screens.
CODE NOTES
----------
6809 Data page = $1c00 (DP=1c)
Known data page contents
$05 - Dip switch 1 copy
$06 - Dip switch 2 copy (inverted)
$07 - Dip switch 3 copy
$18 - Bonus Gun Score
$1d - Spiders to complete belt after dipsw decode
$c496 - Wait for vblank ($c04a bit 7 goes high)
$f9cf - Clear screen (Bank0&1)
$c8c6 - RAM test of sorts, called from IRQ handler?
$de2f - Delay loop.
$f9bb - Memory clearance routine
$c761 - Partial DipSW decode
$F987 - Addresses table at $f98d containing four structs:
3c 0C 04 0D 80 (Inverted screen bank 0)
34 0C 00 0D 00 (Normal screen bank 0)
3C 0C 40 0D 80 (Inverted screen bank 1)
34 0C 44 0D 00 (Inverted screen bank 1)
XX Written to PIA2 Reg 3 - B control
XX XX Written to CRTC addr/data
XX XX Written to CRTC addr/data
These tables are used for frame flipping
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
#include "vidhrdw/crtc6845.h"
#include "machine/6821pia.h"
/* VIDHRDW */
int spiders_vh_start(void);
void spiders_vh_stop(void);
void spiders_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh);
void spiders_pia_2_w(int address, int data);
int spiders_pia_2_r(int address);
/* MACHINE */
void spiders_init_machine(void);
int spiders_timed_irq(void);
/* Driver structure definition */
static struct MemoryReadAddress readmem[] =
{
{ 0x0000, 0xbfff, MRA_RAM },
{ 0xc001, 0xc001, crtc6845_register_r },
{ 0xc044, 0xc047, pia_1_r },
{ 0xc048, 0xc04b, spiders_pia_2_r },
{ 0xc050, 0xc053, pia_3_r },
{ 0xc060, 0xc060, input_port_2_r },
{ 0xc080, 0xc080, input_port_3_r },
{ 0xc0a0, 0xc0a0, input_port_4_r },
{ 0xc100, 0xffff, MRA_ROM },
{ -1 } /* end of table */
};
static struct MemoryWriteAddress writemem[] =
{
{ 0x0000, 0xbfff, MWA_RAM },
{ 0xc000, 0xc000, crtc6845_address_w },
{ 0xc001, 0xc001, crtc6845_register_w },
{ 0xc044, 0xc047, pia_1_w },
{ 0xc048, 0xc04b, spiders_pia_2_w },
{ 0xc050, 0xc053, pia_3_w },
{ 0xc100, 0xffff, MWA_ROM },
{ -1 } /* end of table */
};
#if 0
static struct MemoryReadAddress sound_readmem[] =
{
{ 0x0000, 0x007f, MRA_RAM },
{ 0xe000, 0xffff, MRA_ROM },
{ -1 } /* end of table */
};
static struct MemoryWriteAddress sound_writemem[] =
{
{ 0x0000, 0x007f, MWA_RAM },
{ 0xe000, 0xffff, MWA_ROM },
{ -1 } /* end of table */
};
#endif
INPUT_PORTS_START( spiders_input_ports )
PORT_START /* IN0 */
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_COIN1 )
PORT_BITX(0x02, 0x00, IP_ACTIVE_HIGH , "PS2 (Operator coin)", OSD_KEY_4, IP_JOY_NONE, 0 )
PORT_BITX(0x04, 0x00, IP_ACTIVE_HIGH , "PS3 (Coin Counter)", OSD_KEY_F1, IP_JOY_NONE, 0 )
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_BUTTON1 )
PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_START1 )
PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_START2 )
PORT_BIT( 0x90, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_START /* IN1 */
PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT | IPF_2WAY )
PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT | IPF_2WAY )
PORT_BIT( 0xF3, IP_ACTIVE_HIGH, IPT_UNUSED )
PORT_START /* DSW1 */
PORT_DIPNAME( 0x07, 0x07, "Coins/Credit", IP_KEY_NONE )
PORT_DIPSETTING( 0x07, "1 COIN 1 PLAY" )
PORT_DIPSETTING( 0x06, "4 COINS 5 PLAYS" )
PORT_DIPSETTING( 0x04, "1 COIN 2 PLAYS" )
PORT_DIPSETTING( 0x02, "1 COIN 3 PLAYS" )
PORT_DIPSETTING( 0x01, "2 COINS 1 PLAY" )
PORT_DIPSETTING( 0x00, "FREE PLAY" )
PORT_BIT(0xf8, IP_ACTIVE_LOW,IPT_UNUSED)
PORT_START /* DSW2 */
PORT_DIPNAME( 0x03, 0x03, "Play mode", IP_KEY_NONE )
PORT_DIPSETTING( 0x00, "A A'" )
PORT_DIPSETTING( 0x01, "A B'" )
PORT_DIPSETTING( 0x02, "B A'" )
PORT_DIPSETTING( 0x03, "B B'" )
PORT_DIPNAME( 0x0c, 0x0c, "Spiders to complete belt", IP_KEY_NONE )
PORT_DIPSETTING( 0x00, "14" )
PORT_DIPSETTING( 0x04, "20" )
PORT_DIPSETTING( 0x08, "26" )
PORT_DIPSETTING( 0x0c, "16" )
PORT_DIPNAME( 0x10, 0x10, "Spare Guns", IP_KEY_NONE )
PORT_DIPSETTING( 0x00, "4" )
PORT_DIPSETTING( 0x10, "3" )
PORT_DIPNAME( 0x60, 0x60, "Score for bonus gun", IP_KEY_NONE )
PORT_DIPSETTING( 0x00, "NONE" )
PORT_DIPSETTING( 0x20, "20K" )
PORT_DIPSETTING( 0x40, "25K" )
PORT_DIPSETTING( 0x60, "15K" )
PORT_DIPNAME( 0x80, 0x00, "Giant Spiders", IP_KEY_NONE )
PORT_DIPSETTING( 0x00, "First screen" )
PORT_DIPSETTING( 0x80, "Every screen" )
PORT_START /* DSW3 */
PORT_DIPNAME( 0x01, 0x00, "Flip Screen", IP_KEY_NONE )
PORT_DIPSETTING( 0x00, "Off" )
PORT_DIPSETTING( 0x01, "On" )
PORT_DIPNAME( 0x02, 0x02, "Cabinet", IP_KEY_NONE )
PORT_DIPSETTING( 0x02, "Upright" )
PORT_DIPSETTING( 0x00, "Cocktail" )
PORT_DIPNAME( 0x1c, 0x00, "Vertical Adjust", IP_KEY_NONE )
PORT_DIPSETTING( 0x00, "0" )
PORT_DIPSETTING( 0x04, "1" )
PORT_DIPSETTING( 0x08, "2" )
PORT_DIPSETTING( 0x0c, "3" )
PORT_DIPSETTING( 0x10, "4" )
PORT_DIPSETTING( 0x14, "5" )
PORT_DIPSETTING( 0x18, "6" )
PORT_DIPSETTING( 0x1c, "7" )
PORT_DIPNAME( 0xe0, 0x00, "Horizontal Adjust", IP_KEY_NONE )
PORT_DIPSETTING( 0x00, "0" )
PORT_DIPSETTING( 0x20, "1" )
PORT_DIPSETTING( 0x40, "2" )
PORT_DIPSETTING( 0x60, "3" )
PORT_DIPSETTING( 0x80, "4" )
PORT_DIPSETTING( 0xa0, "5" )
PORT_DIPSETTING( 0xc0, "6" )
PORT_DIPSETTING( 0xe0, "7" )
PORT_START /* Connected to PIA2 CA1 input */
PORT_BIT( 0xFF, IP_ACTIVE_HIGH, IPT_VBLANK )
PORT_START /* Connected to PIA1 CB1 input */
PORT_BITX(0xff, 0xff, IP_ACTIVE_LOW, "PS1 (Crosshatch)", OSD_KEY_F2, IP_JOY_NONE, 0 )
INPUT_PORTS_END
/* The bitmap RAM is directly mapped to colors, no PROM. */
static unsigned char palette[] =
{
0x00,0x00,0x00,
0xff,0x00,0x00,
0x00,0xff,0x00,
0xff,0xff,0x00,
0x00,0x00,0xff,
0xff,0x00,0xff,
0x00,0xff,0xff,
0xff,0xff,0xff,
};
static struct MachineDriver machine_driver =
{
/* basic machine hardware */
{
{
CPU_M6809,
2800000,
0,
readmem,writemem,0,0,
0,0, /* Vblank Int */
spiders_timed_irq , 25 /* Timed Int */
},
},
60,
DEFAULT_REAL_60HZ_VBLANK_DURATION,
10, /* 10 CPU slices per frame - enough for the sound CPU to read all commands */
spiders_init_machine,
/* video hardware */
32*8, 28*8, /* Width/Height */
{ 0*8, 32*8-1, 0*8, 28*8-1 }, /* Visible area */
0, /* GfxDecodeInfo */
8, /* Number of colours */
0, /* Colour table length */
0, /* Convert colour prom */
VIDEO_TYPE_RASTER | VIDEO_SUPPORTS_DIRTY, /* Video attributes */
0, /* Video initialisation */
spiders_vh_start, /* Video start */
spiders_vh_stop, /* Video stop */
spiders_vh_screenrefresh, /* Video update */
/* sound hardware */
0,0,0,0
/* Sound struct here */
};
ROM_START( spiders_rom )
ROM_REGION(0x10000)
ROM_LOAD( "sp1.bin", 0x0c000, 0x1000, 0x6a2578f6 )
ROM_LOAD( "sp2.bin", 0x0d000, 0x1000, 0xcf71d12b )
ROM_LOAD( "sp3.bin", 0x0e000, 0x1000, 0x464125da )
ROM_LOAD( "sp4.bin", 0x0f000, 0x1000, 0xf3d126bb )
ROM_REGION_DISPOSE(0x1000) /* temporary space for graphics (disposed after conversion) */
/* empty memory region - not used by the game, but needed because the main */
/* core currently always frees region #1 after initialization. */
ROM_REGION(0x10000) /* 64k for the audio CPU */
ROM_LOAD( "sp10b.bin", 0x0f000, 0x1000, 0x88d2c44d )
ROM_REGION(0x10000) /* 64k graphics block */
ROM_LOAD( "sp5.bin", 0x00000, 0x1000, 0xb6731baa )
ROM_LOAD( "sp6.bin", 0x01000, 0x1000, 0xbaec64e7 )
ROM_LOAD( "sp7.bin", 0x02000, 0x1000, 0xa40a5517 )
ROM_LOAD( "sp8.bin", 0x03000, 0x1000, 0x3ca08053 )
ROM_LOAD( "sp9a.bin", 0x04000, 0x1000, 0x07ea073c )
ROM_LOAD( "sp10a.bin", 0x05000, 0x1000, 0x41b344b4 )
ROM_LOAD( "sp9b.bin", 0x06000, 0x1000, 0x4d37da5a )
ROM_END
struct GameDriver spiders_driver =
{
__FILE__,
0,
"spiders",
"Spiders",
"1981",
"Sigma",
"Keith Wilkins",
0,
&machine_driver,
0,
spiders_rom,
0, 0,
0,
0,
spiders_input_ports,
0, palette, 0,
ORIENTATION_ROTATE_270,
0,0
};
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