dec0.cpp: emulated sound protection state machine for Sly Spy and get rid of ROM patch [Angelo Salese]
angelosa
parent
ac6c08eb74
commit
6fd1943ae2
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@ -48,7 +48,7 @@ ToDo:
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- graphics are completely broken in Secret Agent (bootleg);
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- Fighting Fantasy (bootleg) doesn't move on when killing the Lamia, is the MCU involved?
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- Hook up the 68705 in Midnight Resistance (bootleg) (it might not be used, leftover from the Fighting Fantasy bootleg on the same PCB?)
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- Get rid of ROM patches in Sly Spy and Hippodrome;
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- Get rid of ROM patch in Hippodrome;
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- background pen in Birdie Try is presumably wrong.
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- Pixel clock frequency isn't verified;
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- Finally, get a proper decap of the MCUs used by Dragonninja and Birdie Try;
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@ -564,7 +564,7 @@ READ16_MEMBER(dec0_state::slyspy_state_r)
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static ADDRESS_MAP_START( slyspy_protection_map, AS_PROGRAM, 16, dec0_state )
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AM_RANGE(0x04000, 0x04001) AM_MIRROR(0x30000) AM_READ(slyspy_state_r)
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AM_RANGE(0x04000, 0x04001) AM_MIRROR(0x30000) AM_READ(slyspy_state_r) AM_WRITENOP
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AM_RANGE(0x0a000, 0x0a001) AM_MIRROR(0x30000) AM_WRITE(slyspy_state_w)
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// Default state (called by Traps 1, 3, 4, 7, C)
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AM_RANGE(0x00000, 0x00007) AM_DEVWRITE("tilegen2", deco_bac06_device, pf_control_0_w)
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@ -669,15 +669,59 @@ ADDRESS_MAP_END
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/* Physical memory map (21 bits) */
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static ADDRESS_MAP_START( slyspy_s_map, AS_PROGRAM, 8, dec0_state )
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AM_RANGE(0x000000, 0x00ffff) AM_ROM
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AM_RANGE(0x090000, 0x090001) AM_DEVWRITE("ym2", ym3812_device, write)
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AM_RANGE(0x0a0000, 0x0a0001) AM_READNOP /* Protection counter */
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AM_RANGE(0x0b0000, 0x0b0001) AM_DEVWRITE("ym1", ym2203_device, write)
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AM_RANGE(0x0e0000, 0x0e0001) AM_DEVREADWRITE("oki", okim6295_device, read, write)
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AM_RANGE(0x0f0000, 0x0f0001) AM_DEVREAD("soundlatch", generic_latch_8_device, read)
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AM_RANGE(0x080000, 0x0fffff) AM_DEVICE("sndprotect", address_map_bank_device, amap8 )
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AM_RANGE(0x1f0000, 0x1f1fff) AM_RAMBANK("bank8")
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AM_RANGE(0x1ff400, 0x1ff403) AM_DEVWRITE("audiocpu", h6280_device, irq_status_w)
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ADDRESS_MAP_END
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// sly spy sound state protection machine emulation
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// similar to the video state machine
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// current bank is at 0x1f0045, incremented by 1 then here is read
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READ8_MEMBER(dec0_state::slyspy_sound_state_r)
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{
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m_slyspy_sound_state ++;
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m_slyspy_sound_state &= 3;
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m_sndprotect->set_bank(m_slyspy_sound_state);
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// returned value doesn't matter
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return 0xff;
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}
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READ8_MEMBER(dec0_state::slyspy_sound_state_reset_r)
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{
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m_slyspy_sound_state = 0;
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m_sndprotect->set_bank(m_slyspy_sound_state);
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// returned value doesn't matter
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return 0xff;
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}
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static ADDRESS_MAP_START( slyspy_sound_protection_map, AS_PROGRAM, 8, dec0_state )
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AM_RANGE(0x020000, 0x020001) AM_MIRROR(0x180000) AM_READ(slyspy_sound_state_r) /* Protection counter */
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AM_RANGE(0x050000, 0x050001) AM_MIRROR(0x180000) AM_READ(slyspy_sound_state_reset_r)
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// state 0
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AM_RANGE(0x010000, 0x010001) AM_DEVWRITE("ym2", ym3812_device, write)
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AM_RANGE(0x030000, 0x030001) AM_DEVWRITE("ym1", ym2203_device, write)
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AM_RANGE(0x060000, 0x060001) AM_DEVREADWRITE("oki", okim6295_device, read, write)
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AM_RANGE(0x070000, 0x070001) AM_DEVREAD("soundlatch", generic_latch_8_device, read)
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// state 1
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AM_RANGE(0x090000, 0x090001) AM_DEVREADWRITE("oki", okim6295_device, read, write)
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AM_RANGE(0x0c0000, 0x0c0001) AM_DEVREAD("soundlatch", generic_latch_8_device, read)
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AM_RANGE(0x0e0000, 0x0e0001) AM_DEVWRITE("ym1", ym2203_device, write)
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AM_RANGE(0x0f0000, 0x0f0001) AM_DEVWRITE("ym2", ym3812_device, write)
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// state 2
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AM_RANGE(0x110000, 0x110001) AM_DEVREAD("soundlatch", generic_latch_8_device, read)
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AM_RANGE(0x130000, 0x130001) AM_DEVREADWRITE("oki", okim6295_device, read, write)
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AM_RANGE(0x140000, 0x140001) AM_DEVWRITE("ym1", ym2203_device, write)
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AM_RANGE(0x170000, 0x170001) AM_DEVWRITE("ym2", ym3812_device, write)
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// state 3
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AM_RANGE(0x190000, 0x190001) AM_DEVWRITE("ym2", ym3812_device, write)
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AM_RANGE(0x1c0000, 0x1c0001) AM_DEVWRITE("ym1", ym2203_device, write)
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AM_RANGE(0x1e0000, 0x1e0001) AM_DEVREAD("soundlatch", generic_latch_8_device, read)
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AM_RANGE(0x1f0000, 0x1f0001) AM_DEVREADWRITE("oki", okim6295_device, read, write)
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ADDRESS_MAP_END
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static ADDRESS_MAP_START( midres_s_map, AS_PROGRAM, 8, dec0_state )
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AM_RANGE(0x000000, 0x00ffff) AM_ROM
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AM_RANGE(0x108000, 0x108001) AM_DEVWRITE("ym2", ym3812_device, write)
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@ -1906,6 +1950,8 @@ MACHINE_RESET_MEMBER(dec0_state,slyspy)
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// set initial memory map
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m_slyspy_state = 0;
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m_pfprotect->set_bank(m_slyspy_state);
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m_slyspy_sound_state = 0;
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m_sndprotect->set_bank(m_slyspy_sound_state);
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}
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static MACHINE_CONFIG_DERIVED( slyspy, dec1 )
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@ -1925,6 +1971,14 @@ static MACHINE_CONFIG_DERIVED( slyspy, dec1 )
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MCFG_ADDRESS_MAP_BANK_ADDRBUS_WIDTH(18)
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MCFG_ADDRESS_MAP_BANK_STRIDE(0x10000)
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MCFG_DEVICE_ADD("sndprotect", ADDRESS_MAP_BANK, 0)
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MCFG_DEVICE_PROGRAM_MAP(slyspy_sound_protection_map)
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MCFG_ADDRESS_MAP_BANK_ENDIANNESS(ENDIANNESS_LITTLE)
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MCFG_ADDRESS_MAP_BANK_DATABUS_WIDTH(8)
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MCFG_ADDRESS_MAP_BANK_ADDRBUS_WIDTH(21)
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MCFG_ADDRESS_MAP_BANK_STRIDE(0x80000)
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/* video hardware */
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MCFG_SCREEN_MODIFY("screen")
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MCFG_SCREEN_UPDATE_DRIVER(dec0_state, screen_update_slyspy)
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@ -28,6 +28,7 @@ public:
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m_tilegen3(*this, "tilegen3"),
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m_spritegen(*this, "spritegen"),
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m_pfprotect(*this, "pfprotect"),
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m_sndprotect(*this, "sndprotect"),
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m_soundlatch(*this, "soundlatch"),
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m_ram(*this, "ram"),
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m_spriteram(*this, "spriteram"),
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@ -45,6 +46,7 @@ public:
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optional_device<deco_bac06_device> m_tilegen3;
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optional_device<deco_mxc06_device> m_spritegen;
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optional_device<address_map_bank_device> m_pfprotect;
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optional_device<address_map_bank_device> m_sndprotect;
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required_device<generic_latch_8_device> m_soundlatch;
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required_shared_ptr<uint16_t> m_ram;
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@ -57,6 +59,7 @@ public:
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uint16_t m_i8751_return;
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uint16_t m_i8751_command;
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int m_slyspy_state;
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int m_slyspy_sound_state;
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int m_hippodrm_msb;
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int m_hippodrm_lsb;
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uint8_t m_i8751_ports[4];
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@ -84,6 +87,9 @@ public:
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DECLARE_WRITE16_MEMBER(dec0_priority_w);
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DECLARE_READ16_MEMBER(ffantasybl_242024_r);
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DECLARE_READ8_MEMBER(slyspy_sound_state_r);
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DECLARE_READ8_MEMBER(slyspy_sound_state_reset_r);
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DECLARE_DRIVER_INIT(robocop);
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DECLARE_DRIVER_INIT(hippodrm);
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DECLARE_DRIVER_INIT(hbarrel);
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@ -366,14 +366,10 @@ DRIVER_INIT_MEMBER(dec0_state,hippodrm)
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DRIVER_INIT_MEMBER(dec0_state,slyspy)
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{
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uint8_t *RAM = memregion("audiocpu")->base();
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h6280_decrypt("audiocpu");
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/* Slyspy sound cpu has some protection */
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RAM[0xf2d] = 0xea;
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RAM[0xf2e] = 0xea;
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save_item(NAME(m_slyspy_state));
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save_item(NAME(m_slyspy_sound_state));
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}
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DRIVER_INIT_MEMBER(dec0_state,robocop)
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