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https://github.com/holub/mame
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1943.c: Improved protection emulation [Dave]
This commit is contained in:
Michaël Banaan Ananas
parent
7e282a4523
commit
0ad10db25d
@ -34,20 +34,64 @@
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#include "includes/1943.h"
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/* Read/Write Handlers */
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/* Protection Handlers */
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WRITE8_MEMBER(_1943_state::c1943_protection_w)
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{
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m_prot_value = data;
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}
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READ8_MEMBER(_1943_state::c1943_protection_r)
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{
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/*
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This is a protection check. The game crashes (thru a jump to 0x8000)
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if a read from this address doesn't return the value it expects.
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*/
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// The game crashes (through a jump to 0x8000) if the return value is not what it expects..
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int data = space.device().state().state_int(Z80_BC) >> 8;
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// logerror("protection read, PC: %04x Result:%02x\n", space.device().safe_pc(), data);
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return data;
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switch (m_prot_value)
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{
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// This data comes from a table at $21a containing 64 entries, even is "case", odd is return value.
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case 0x24: return 0x1d;
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case 0x60: return 0xf7;
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case 0x01: return 0xac;
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case 0x55: return 0x50;
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case 0x56: return 0xe2;
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case 0x2a: return 0x58;
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case 0xa8: return 0x13;
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case 0x22: return 0x3e;
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case 0x3b: return 0x5a;
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case 0x1e: return 0x1b;
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case 0xe9: return 0x41;
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case 0x7d: return 0xd5;
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case 0x43: return 0x54;
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case 0x37: return 0x6f;
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case 0x4c: return 0x59;
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case 0x5f: return 0x56;
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case 0x3f: return 0x2f;
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case 0x3e: return 0x3d;
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case 0xfb: return 0x36;
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case 0x1d: return 0x3b;
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case 0x27: return 0xae;
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case 0x26: return 0x39;
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case 0x58: return 0x3c;
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case 0x32: return 0x51;
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case 0x1a: return 0xa8;
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case 0xbc: return 0x33;
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case 0x30: return 0x4a;
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case 0x64: return 0x12;
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case 0x11: return 0x40;
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case 0x33: return 0x35;
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case 0x09: return 0x17;
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case 0x25: return 0x04;
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}
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return 0;
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}
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// The bootleg expects 0x00 to be returned from the protection reads because the protection has been patched out.
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READ8_MEMBER(_1943_state::_1943b_c007_r)
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{
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return 0;
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}
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/* Memory Maps */
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static ADDRESS_MAP_START( c1943_map, AS_PROGRAM, 8, _1943_state )
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@ -62,7 +106,7 @@ static ADDRESS_MAP_START( c1943_map, AS_PROGRAM, 8, _1943_state )
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AM_RANGE(0xc800, 0xc800) AM_WRITE(soundlatch_byte_w)
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AM_RANGE(0xc804, 0xc804) AM_WRITE(c1943_c804_w) // ROM bank switch, screen flip
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AM_RANGE(0xc806, 0xc806) AM_WRITE(watchdog_reset_w)
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AM_RANGE(0xc807, 0xc807) AM_WRITENOP // ???
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AM_RANGE(0xc807, 0xc807) AM_WRITE(c1943_protection_w)
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AM_RANGE(0xd000, 0xd3ff) AM_RAM_WRITE(c1943_videoram_w) AM_SHARE("videoram")
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AM_RANGE(0xd400, 0xd7ff) AM_RAM_WRITE(c1943_colorram_w) AM_SHARE("colorram")
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AM_RANGE(0xd800, 0xd801) AM_RAM AM_SHARE("scrollx")
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@ -243,25 +287,30 @@ GFXDECODE_END
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/* Machine Driver */
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void _1943_state::machine_start()
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{
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save_item(NAME(m_prot_value));
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}
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void _1943_state::machine_reset()
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{
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m_char_on = 0;
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m_obj_on = 0;
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m_bg1_on = 0;
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m_bg2_on = 0;
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m_prot_value = 0;
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}
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static MACHINE_CONFIG_START( 1943, _1943_state )
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// basic machine hardware
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MCFG_CPU_ADD("maincpu", Z80, XTAL_24MHz/4) /* verified on pcb */
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MCFG_CPU_ADD("maincpu", Z80, XTAL_24MHz/4) /* verified on pcb */
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MCFG_CPU_PROGRAM_MAP(c1943_map)
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MCFG_CPU_VBLANK_INT_DRIVER("screen", _1943_state, irq0_line_hold)
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MCFG_CPU_ADD("audiocpu", Z80, XTAL_24MHz/8) /* verified on pcb */
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MCFG_CPU_PROGRAM_MAP(sound_map)
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MCFG_CPU_PERIODIC_INT_DRIVER(_1943_state, irq0_line_hold, 4*60)
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MCFG_CPU_PERIODIC_INT_DRIVER(_1943_state, irq0_line_hold, 4*60)
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// video hardware
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MCFG_SCREEN_ADD("screen", RASTER)
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@ -274,17 +323,16 @@ static MACHINE_CONFIG_START( 1943, _1943_state )
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MCFG_GFXDECODE(1943)
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MCFG_PALETTE_LENGTH(32*4+16*16+16*16+16*16)
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// sound hardware
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MCFG_SPEAKER_STANDARD_MONO("mono")
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MCFG_SOUND_ADD("ym1", YM2203, XTAL_24MHz/16) /* verified on pcb */
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MCFG_SOUND_ADD("ym1", YM2203, XTAL_24MHz/16) /* verified on pcb */
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MCFG_SOUND_ROUTE(0, "mono", 0.15)
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MCFG_SOUND_ROUTE(1, "mono", 0.15)
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MCFG_SOUND_ROUTE(2, "mono", 0.15)
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MCFG_SOUND_ROUTE(3, "mono", 0.10)
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MCFG_SOUND_ADD("ym2", YM2203, XTAL_24MHz/16) /* verified on pcb */
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MCFG_SOUND_ADD("ym2", YM2203, XTAL_24MHz/16) /* verified on pcb */
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MCFG_SOUND_ROUTE(0, "mono", 0.15)
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MCFG_SOUND_ROUTE(1, "mono", 0.15)
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MCFG_SOUND_ROUTE(2, "mono", 0.15)
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@ -642,15 +690,11 @@ DRIVER_INIT_MEMBER(_1943_state,1943)
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membank("bank1")->configure_entries(0, 8, &ROM[0x10000], 0x4000);
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}
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READ8_MEMBER(_1943_state::_1943b_c007_r){ return 0; }
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DRIVER_INIT_MEMBER(_1943_state,1943b)
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{
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DRIVER_INIT_CALL(1943);
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//it expects 0x00 to be returned from the protection reads because the protection has been patched out.
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//AM_RANGE(0xc007, 0xc007) AM_READ(c1943_protection_r)
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m_maincpu->space(AS_PROGRAM).install_read_handler(0xc007, 0xc007, read8_delegate(FUNC(_1943_state::_1943b_c007_r),this));
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m_maincpu->space(AS_PROGRAM).install_read_handler(0xc007, 0xc007, read8_delegate(FUNC(_1943_state::_1943b_c007_r),this));
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}
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/* Game Drivers */
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@ -9,15 +9,17 @@ class _1943_state : public driver_device
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public:
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_1943_state(const machine_config &mconfig, device_type type, const char *tag)
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: driver_device(mconfig, type, tag),
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m_maincpu(*this, "maincpu"),
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m_videoram(*this, "videoram"),
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m_colorram(*this, "colorram"),
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m_scrollx(*this, "scrollx"),
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m_scrolly(*this, "scrolly"),
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m_bgscrollx(*this, "bgscrollx"),
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m_spriteram(*this, "spriteram"),
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m_maincpu(*this, "maincpu") { }
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m_spriteram(*this, "spriteram")
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{ }
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/* memory pointers */
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/* devices / memory pointers */
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required_device<cpu_device> m_maincpu;
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required_shared_ptr<UINT8> m_videoram;
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required_shared_ptr<UINT8> m_colorram;
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required_shared_ptr<UINT8> m_scrollx;
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@ -33,8 +35,13 @@ public:
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int m_obj_on;
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int m_bg1_on;
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int m_bg2_on;
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/* protection */
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UINT8 m_prot_value;
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DECLARE_WRITE8_MEMBER(c1943_protection_w);
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DECLARE_READ8_MEMBER(c1943_protection_r);
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DECLARE_READ8_MEMBER(_1943b_c007_r);
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DECLARE_WRITE8_MEMBER(c1943_videoram_w);
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DECLARE_WRITE8_MEMBER(c1943_colorram_w);
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DECLARE_WRITE8_MEMBER(c1943_c804_w);
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@ -44,10 +51,10 @@ public:
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TILE_GET_INFO_MEMBER(c1943_get_bg2_tile_info);
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TILE_GET_INFO_MEMBER(c1943_get_bg_tile_info);
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TILE_GET_INFO_MEMBER(c1943_get_fg_tile_info);
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virtual void machine_start();
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virtual void machine_reset();
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virtual void video_start();
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virtual void palette_init();
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UINT32 screen_update_1943(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
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void draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect, int priority );
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required_device<cpu_device> m_maincpu;
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};
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