Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-20 23:42:22 +03:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

ms5pcb decryption is the same, rom was bad

Browse Source
This commit is contained in:
davidhay 2008-09-20 11:53:46 +00:00
parent 75c3ea62a7
commit 3b6ebfba72
3 changed files with 20 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/mame/drivers/neodrvr.c
View File

@ -5672,11 +5672,15 @@ ROM_START( ms5pcb ) /* Encrypted Set */
/* this contains both an ASIA and JAPAN bios, HARDDIP3 on the PCB selects which to use */
ROM_LOAD16_WORD_SWAP( "268-bios.bin", 0x00000, 0x80000, CRC(b4590283) SHA1(47047ed5b6062babc0a0bebcc30e4b3f021e115a) )
/* Encrypted (slightly different encryption on this single board PCB) */
/* Encrypted */
ROM_REGION( 0x80000, "audiocrypt", 0 )
ROM_LOAD( "268-m1.bin", 0x00000, 0x10000, CRC(58b107d0) SHA1(cc7fe66ff4f9c026cde4df06f86c848eb21f7af8) )
ROM_LOAD( "271-m1.bin", 0x00000, 0x80000, CRC(4a5a6e0e) SHA1(df0f660f2465e1db7be5adfcaf5e88ad61a74a42) )
ROM_REGION( 0x90000, "audio", ROMREGION_ERASEFF )
/* Encrypted */
ROM_Y_ZOOM
ROM_REGION( 0x1000000, "ym", 0 )
@ -7036,7 +7040,7 @@ static DRIVER_INIT( ms5pcb )
mslug5_decrypt_68k(machine);
svcpcb_gfx_decrypt(machine);
kof2000_neogeo_gfx_decrypt(machine, 0x19);
neogeo_ms5pcb_m1_decrypt(machine);
neogeo_cmc50_m1_decrypt(machine, 0x1543);
neogeo_fixed_layer_bank_type = 2;
svcpcb_s1data_decrypt(machine);

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

@ -68,7 +68,6 @@ void neo_pcm2_snk_1999(running_machine *machine, int value);
void neo_pcm2_swap(running_machine *machine, int value);
void neogeo_cmc50_m1_decrypt(running_machine *machine, UINT16 key);
void neogeo_ms5pcb_m1_decrypt(running_machine *machine);
/*----------- defined in machine/neoprot.c -----------*/

59
src/mame/machine/neocrypt.c
View File

@ -1514,54 +1514,21 @@ void neogeo_cmc50_m1_decrypt(running_machine *machine, UINT16 key)
}
#endif
}
/* the ms5pcb encryption is slightly different, there are 2 possible approachs
we can take */
#if 1
// if using key 0x1543 (same as mslug5) we need a different bitswap here
int m1_alt_address_scramble(int address/*, UINT16 key*/)
{
int aux;
UINT16 key = 0x1543;
aux = address ^key;
aux = BITSWAP16(aux, 11,0,2,5,12,7,4,9,10,8,3,14,15,6,13,1); // only 1 64k block, so...
aux ^= m1_address_0_7_xor[(aux>>8)&0xff];
aux ^= m1_address_8_15_xor[aux&0xff]<<8;
aux = BITSWAP16(aux, 7,15,14,6,5,13,12,4,11,3,10,2,9,1,8,0);
return aux;
}
#else
// using key 0xa528, we can rearrange the rom first..
int m1_alt_address_scramble(int address/*, UINT16 key */)
{
UINT16 key = 0xa528;
address = BITSWAP16(address, 1,13,12,4,7,6,2,10,15,5,0,11,8,3,14,9);
return m1_address_scramble(address, key);
}
#endif
void neogeo_ms5pcb_m1_decrypt(running_machine *machine/*, UINT16 key*/)
{
UINT8* rom = memory_region(machine, "audiocrypt");
size_t rom_size = 0x80000;
UINT8* rom2 = memory_region(machine, "audio");
UINT8* buffer = malloc_or_die(rom_size);
UINT32 i;
for (i=0; i<rom_size; i++)
#if 0
{
buffer[i] = rom[m1_alt_address_scramble(i)];
FILE *fp;
const char *gamename = machine->gamedrv->name;
char filename[256];
sprintf(filename, "%s_m1extra.dump", gamename);
fp=fopen(filename, "w+b");
if (fp)
{
fwrite(&rom[0xf800], 0x800, 1, fp);
fclose(fp);
}
}
#endif
memcpy(rom,buffer,rom_size);
memcpy(rom2,rom,0x10000);
memcpy(rom2+0x10000,rom,0x80000);
}