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Let's just ROM patch shrug (nw)

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This commit is contained in:
angelosa 2018-01-18 01:29:50 +01:00
parent b825890d78
commit 07304b6670
2 changed files with 23 additions and 18 deletions
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40
src/mame/drivers/blockout.cpp
View File

@ -288,22 +288,6 @@ void blockout_state::machine_start()
void blockout_state::machine_reset()
{
m_color = 0;
/*
* agress checks at F3A that this is mirrored, blockout glitches if you mirror to it
* But actually mirroring this VRAM makes display to be offset
* (clearly visible with text being on top bank instead of bottom during gameplay)
* There are many possible solutions to this:
* A) reads are actually ORed between upper and lower banks
* B) VRAM is initialized with same pattern checked
* C) Agress isn't truly identical to Block Out HW wise, it really mirrors VRAM data and offsets display
* For now
*/
for(int i=0;i<0x4000/2;i++)
{
m_frontvideoram[i] = i;
m_frontvideoram[i+0x4000/2] = i;
}
}
TIMER_DEVICE_CALLBACK_MEMBER(blockout_state::blockout_scanline)
@ -448,8 +432,28 @@ ROM_END
*
*************************************/
DRIVER_INIT_MEMBER(blockout_state,agress)
{
/*
* agress checks at F3A that this is mirrored, blockout glitches if you mirror to it
* But actually mirroring this VRAM makes display to be offset
* (clearly visible with text being on top bank instead of bottom during gameplay)
* There are many possible solutions to this:
* A) reads are actually ORed between upper and lower banks
* B) VRAM is initialized with same pattern checked, or extreme open bus occurs for the second uninitalized bank.
* C) Agress isn't truly identical to Block Out HW wise, it really mirrors VRAM data and offsets display
* D) it's not supposed to enter into trace mode at all, cause of the bogus mirror check (trace exception
* occurs at very beginning of the program execution)
* For now let's use D and just patch the TRACE exception that causes the bogus mirror check
*/
uint16_t *rom = (uint16_t *)memregion("maincpu")->base();
rom[0x82/2] = 0x2700;
}
GAME( 1989, blockout, 0, blockout, blockout, blockout_state, 0, ROT0, "Technos Japan / California Dreams", "Block Out (set 1)", MACHINE_SUPPORTS_SAVE )
GAME( 1989, blockout2,blockout, blockout, blockout, blockout_state, 0, ROT0, "Technos Japan / California Dreams", "Block Out (set 2)", MACHINE_SUPPORTS_SAVE )
GAME( 1989, blockoutj,blockout, blockout, blockoutj, blockout_state, 0, ROT0, "Technos Japan / California Dreams", "Block Out (Japan)", MACHINE_SUPPORTS_SAVE )
GAME( 1991, agress, 0, agress, agress, blockout_state, 0, ROT0, "Palco", "Agress - Missile Daisenryaku (Japan)", MACHINE_SUPPORTS_SAVE )
GAME( 2003, agressb, agress, agress, agress, blockout_state, 0, ROT0, "bootleg", "Agress - Missile Daisenryaku (English bootleg)", MACHINE_SUPPORTS_SAVE )
GAME( 1991, agress, 0, agress, agress, blockout_state, agress, ROT0, "Palco", "Agress - Missile Daisenryaku (Japan)", MACHINE_SUPPORTS_SAVE )
GAME( 2003, agressb, agress, agress, agress, blockout_state, agress, ROT0, "bootleg", "Agress - Missile Daisenryaku (English bootleg)", MACHINE_SUPPORTS_SAVE )

1
src/mame/includes/blockout.h
View File

@ -47,6 +47,7 @@ public:
DECLARE_WRITE16_MEMBER(blockout_paletteram_w);
DECLARE_WRITE16_MEMBER(blockout_frontcolor_w);
DECLARE_WRITE16_MEMBER(blockout_videoram_w);
DECLARE_DRIVER_INIT(agress);
virtual void machine_start() override;
virtual void machine_reset() override;
virtual void video_start() override;