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-Added decryption support for Music Ball [Andreas Naive]

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New games added or promoted from NOT_WORKING status
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Music Ball [Andreas Naive]
This commit is contained in:
Andreas Naive 2014-08-01 21:39:45 +00:00
parent 173ad874ef
commit 79bbf9d8a8
1 changed files with 16 additions and 144 deletions
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160
src/mame/drivers/speedbal.c
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@ -5,10 +5,6 @@
this was available in a number of cabinet types including 'Super Pin-Ball'
which mimicked a Pinball table in design, complete with 7-seg scoreboard.
TODO:
- decrypt Music Ball
driver by Joseba Epalza
- 4MHz XTAL, 20MHz XTAL
@ -314,8 +310,6 @@ ROM_START( speedbal )
ROM_LOAD( "sb6.bin", 0x08000, 0x08000, CRC(0e2506eb) SHA1(56f779266b977819063c475b84ca246fc6d8d6a7) )
ROM_END
//#define USE_DECRYPTION_HELPER
ROM_START( musicbal )
ROM_REGION( 0x10000, "maincpu", 0 ) /* 64K for code: main - encrypted */
ROM_LOAD( "01.bin", 0x0000, 0x8000, CRC(412298a2) SHA1(3c3247b466880cd78dd7f7f73911f475352c15df) )
@ -336,157 +330,35 @@ ROM_START( musicbal )
ROM_REGION( 0x10000, "sprites", ROMREGION_INVERT ) // still contain Speed Ball logos!
ROM_LOAD( "07.bin", 0x00000, 0x08000, CRC(310e1e23) SHA1(290f3e1c7b907165fe60a4ebe7a8b04b2451b3b1) ) /* sprites */
ROM_LOAD( "06.bin", 0x08000, 0x08000, CRC(2e7772f8) SHA1(caded1a72356501282e627e23718c30cb8f09370) )
#ifdef USE_DECRYPTION_HELPER
/* speed ball code for decryption comparison help */
ROM_REGION( 0x10000, "helper", 0 )
ROM_LOAD( "sb1.bin", 0x0000, 0x8000, CRC(1c242e34) SHA1(8b2e8983e0834c99761ce2b5ea765dba56e77964) )
ROM_LOAD( "sb3.bin", 0x8000, 0x8000, CRC(7682326a) SHA1(15a72bf088a9adfaa50c11202b4970e07c309a21) )
#endif
ROM_END
#define MUSICBALL_XOR05 { rom[i] = rom[i] ^ 0x05; }
#define MUSICBALL_XOR84 { rom[i] = rom[i] ^ 0x84; }
#define MUSICBALL_SWAP1 { rom[i] = BITSWAP8(rom[i],2,6,5,4,3,7,0,1); }
#define MUSICBALL_SWAP2 { rom[i] = BITSWAP8(rom[i],7,6,5,4,3,0,2,1); }
// are bits 6,5,4,3 affected, or does this work on only the 4 bits?
DRIVER_INIT_MEMBER(speedbal_state,musicbal)
{
UINT8* rom = memregion("maincpu")->base();
// significant blocks of text etc. should be the same as speedbal
const UINT8 xorTable[8] = {0x05, 0x06, 0x84, 0x84, 0x00, 0x87, 0x84, 0x84}; // XORs affecting bits #0, #1, #2 & #7
const int swapTable[4][4] = { // 4 possible swaps affecting bits #0, #1, #2 & #7
{1,0,7,2},
{2,7,0,1},
{7,2,1,0},
{0,2,1,7}
};
for (int i=0;i<0x8000;i++)
{
// some bits are ^ 0x05
/*if ((i&0x30) == 0x00)
{
if ((( i & 0x0f ) > 0x08) && (( i & 0x0f ) < 0x0f)) MUSICBALL_XOR05
}
*/
int addIdx = BIT(i,3)^(BIT(i,5)<<1)^(BIT(i,9)<<2); // 3 bits of address...
int xorMask = xorTable[addIdx]; // ... control the xor...
int bswIdx = xorMask & 3; // ... and the bitswap
if (!(i&0x0800))
{
if (i&0x0020) { MUSICBALL_XOR84 }
else
{
if (i&0x08) { MUSICBALL_XOR84 }
}
}
else
{
MUSICBALL_XOR84
}
/*
6608: 00, 00, 00, 00, 00, 00, 00, 00, // wrong
6618: 00, 05, 05, 00, 00, 00, 05, 05,
6648: 00, 05, 05, 05, 05, 05, 05, 00,
6658: 05, 05, 00, 05, 00, 00, 00, 00,
6688: 05, 05, 05, 05, 05, 05, 05, 00,
6698: 00, 00, 00, 00, 05, 00, 00, 05,
66c8: 05, 00, 05, 00, 05, 00, 00, 05,
66d8: 05, 05, 05, 05, 00, 05, 05, 05,
6708: 00, 05, 00, 05, 05, 00, 05, 00,
6718: 00, 05, 00, 05, 05, 00, 05, 00,
6748: 05, 05, 05, 05, 05, 05, 05, 00,
6758: 05, 00, 00, 05, 00, 05, 00, 05,
6788: 05, 00, 00, 05, 05, 00, 05, 00,
6798: 05, 00, 05, 00, 05, 05, 05, 05,
67c8: 00, 00, 05, 00, 05, 05, 05, 05,
67d8: 00, 00, 05, 00, 05, 05, 05, 05,
*/
if (!(i&0x0800))
{
if (i&0x0020) { MUSICBALL_SWAP1 }
else
{
if (i&0x08) { MUSICBALL_SWAP2 }
else { MUSICBALL_SWAP1 }
}
}
else
{
MUSICBALL_SWAP1
}
}
#ifdef USE_DECRYPTION_HELPER
UINT8* helper = memregion("helper")->base();
int speedball_position = 0x590c; // a block of text that should mostly match here (terminators seem to be changed 1F 60 <-> DD 52 tho)
int musicball_position = 0x6610; // it's mostly the pattern of where xor 0x05 gets applied we're interested in
int blocklength = 0x2e0; // there is a clear change in pattern > 6800
if (helper)
{
int bytecount = 0;
for (int i=0;i<blocklength;i++)
{
UINT8 music = rom[musicball_position+i];
UINT8 speed = helper[speedball_position+i];
if (bytecount==0) printf("%04x: ", musicball_position+i);
UINT8 display = music ^ speed;
// filter out the terminators
if (display == 0xc2) display = 0x00;
if (display == 0x32) display = 0x00;
if (display == 0xc7) display = 0x05;
if (display == 0x37) display = 0x05;
//printf("%02x-%02x, ", music, speed);
printf("%02x, ", display);
bytecount++;
if (bytecount==16) { bytecount = 0; printf("\n"); }
}
}
{
FILE *fp;
char filename[256];
sprintf(filename,"decrypted_%s", machine().system().name);
fp=fopen(filename, "w+b");
if (fp)
{
fwrite(rom, 0x8000, 1, fp);
fclose(fp);
}
}
#endif
// only bits #0, #1, #2 & #7 are affected
rom[i] = BITSWAP8(rom[i], swapTable[bswIdx][3], 6,5,4,3, swapTable[bswIdx][2], swapTable[bswIdx][1], swapTable[bswIdx][0]) ^ xorTable[addIdx];
}
DRIVER_INIT_CALL(speedbal);
}
GAMEL( 1987, speedbal, 0, speedbal, speedbal, speedbal_state, speedbal, ROT270, "Tecfri / Desystem S.A.", "Speed Ball", 0, layout_speedbal )
GAMEL( 1988, musicbal, 0, speedbal, speedbal, speedbal_state, musicbal, ROT270, "Tecfri / Desystem S.A.", "Music Ball", GAME_NOT_WORKING, layout_speedbal )
GAMEL( 1988, musicbal, 0, speedbal, speedbal, speedbal_state, musicbal, ROT270, "Tecfri / Desystem S.A.", "Music Ball", 0, layout_speedbal )