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Decrypted the color prom in King Derby (1986 version) [Angelo Salese]

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This commit is contained in:
Angelo Salese 2010-03-08 16:21:13 +00:00
parent 89959b2cf1
commit aac8859b80
1 changed files with 37 additions and 2 deletions
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39
src/mame/drivers/kingdrby.c
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@ -933,6 +933,38 @@ static PALETTE_INIT(kingdrby)
}
}
static PALETTE_INIT(kingdrbb)
{
UINT8 *raw_prom = memory_region(machine, "raw_prom");
UINT8 *prom = memory_region(machine, "proms");
int bit0, bit1, bit2 , r, g, b;
int i;
for(i = 0; i < 0x200; i++)
{
/* this set has an extra address line shuffle applied on the prom */
prom[i] = raw_prom[BITSWAP16(i, 15,14,13,12,11,10,9,8,7,6,5,0,1,2,3,4)+0x1000];
}
for(i = 0; i < 0x200; i++)
{
bit0 = 0;
bit1 = (prom[i] >> 1) & 0x01;
bit2 = (prom[i] >> 0) & 0x01;
b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
bit0 = (prom[i] >> 4) & 0x01;
bit1 = (prom[i] >> 3) & 0x01;
bit2 = (prom[i] >> 2) & 0x01;
g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
bit0 = (prom[i] >> 7) & 0x01;
bit1 = (prom[i] >> 6) & 0x01;
bit2 = (prom[i] >> 5) & 0x01;
r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
palette_set_color(machine, i, MAKE_RGB(r, g, b));
}
}
static MACHINE_DRIVER_START( kingdrby )
MDRV_CPU_ADD("master", Z80, CLK_2)
MDRV_CPU_PROGRAM_MAP(master_map)
@ -985,6 +1017,8 @@ static MACHINE_DRIVER_START( kingdrbb )
MDRV_CPU_MODIFY("slave")
MDRV_CPU_PROGRAM_MAP(slave_1986_map)
MDRV_PALETTE_INIT(kingdrbb)
MDRV_PPI8255_RECONFIG( "ppi8255_0", ppi8255_1986_intf[0] )
MDRV_PPI8255_RECONFIG( "ppi8255_1", ppi8255_1986_intf[1] )
MACHINE_DRIVER_END
@ -997,6 +1031,7 @@ static MACHINE_DRIVER_START( cowrace )
MDRV_CPU_IO_MAP(cowrace_sound_io)
MDRV_GFXDECODE(cowrace)
MDRV_PALETTE_INIT(kingdrby)
MDRV_SOUND_ADD("oki", OKIM6295, 1056000)
MDRV_SOUND_CONFIG(okim6295_interface_pin7high) // clock frequency & pin 7 not verified
@ -1067,8 +1102,8 @@ ROM_START( kingdrbb ) // has 'Made in Taiwan' on the PCB.
ROM_REGION( 0x4000, "raw_prom", 0 )
ROM_LOAD( "kingdrbb_u1.bin", 0x0000, 0x4000, CRC(97931952) SHA1(a0ef3be105f2ed7f744c73e92c583d25bb322e6a) ) // palette but in a normal rom?
ROM_REGION( 0x200, "proms", 0 )
ROM_COPY( "raw_prom", 0x1000, 0x000, 0x200 )
ROM_REGION( 0x200, "proms", ROMREGION_ERASE00 ) // address shuffled, decoded inside PALETTE_INIT
// ROM_COPY( "raw_prom", 0x1000, 0x000, 0x200 )
// ROM_COPY( "raw_prom", 0x3000, 0x200, 0x200 ) //identical to 0x1000 bank
ROM_REGION( 0x4000, "pals", 0 ) // all read protected