// license:BSD-3-Clause // copyright-holders:David Haywood /* High Seas Havoc (c)1993 Data East This is an unusual Data East PCB based on the Sega Genesis / Megadrive. The Game was also released on the home system. Produttore Data East N.revisione CG-2 CPU 1x MC68000P8 (main)(12c) 1x Z8400B (sound)(1a) 1x custom SEGA315-5660-FC1004 (QFP208)(5d) 1x PIC16C55 (7a) 1x oscillator 53.6931MHz (osc1) ROMs 2x TMS27C040 (25,26)(11a,9a) 2x PEEL18CV8 (4b,5b) Note 1x JAMMA edge connector 1x trimmer (volume)(vr1) 2x 6 switches dip (dsw1,dsw2) ----------------------------------- PCB markings:"DE-0407-2 MADE IN JAPAN" ----------------------------------- Thanks to DOX, the "mystery chip" has been identified (and verified) as a PIC. It's read protected, but has been decapped and read out. Unfortunately it doesn't help with figuring out the encryption on the coin-op parts of the program. */ #include "emu.h" #include "cpu/z80/z80.h" #include "cpu/m68000/m68000.h" #include "sound/2612intf.h" #include "sound/sn76496.h" #include "includes/megadriv.h" #include "includes/megadriv_acbl.h" static INPUT_PORTS_START( hshavoc ) PORT_START("IN0") /* 16bit */ PORT_DIPNAME( 0x0001, 0x0000, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x0001, DEF_STR( Off ) ) PORT_DIPSETTING( 0x0000, DEF_STR( On ) ) PORT_DIPNAME( 0x0002, 0x0000, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x0002, DEF_STR( Off ) ) PORT_DIPSETTING( 0x0000, DEF_STR( On ) ) PORT_DIPNAME( 0x0004, 0x0000, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x0004, DEF_STR( Off ) ) PORT_DIPSETTING( 0x0000, DEF_STR( On ) ) PORT_DIPNAME( 0x0008, 0x0000, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x0008, DEF_STR( Off ) ) PORT_DIPSETTING( 0x0000, DEF_STR( On ) ) PORT_DIPNAME( 0x0010, 0x0000, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x0010, DEF_STR( Off ) ) PORT_DIPSETTING( 0x0000, DEF_STR( On ) ) PORT_DIPNAME( 0x0020, 0x0000, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x0020, DEF_STR( Off ) ) PORT_DIPSETTING( 0x0000, DEF_STR( On ) ) PORT_DIPNAME( 0x0040, 0x0000, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x0040, DEF_STR( Off ) ) PORT_DIPSETTING( 0x0000, DEF_STR( On ) ) PORT_DIPNAME( 0x0080, 0x0000, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x0080, DEF_STR( Off ) ) PORT_DIPSETTING( 0x0000, DEF_STR( On ) ) PORT_DIPNAME( 0x0100, 0x0000, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x0100, DEF_STR( Off ) ) PORT_DIPSETTING( 0x0000, DEF_STR( On ) ) PORT_DIPNAME( 0x0200, 0x0000, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x0200, DEF_STR( Off ) ) PORT_DIPSETTING( 0x0000, DEF_STR( On ) ) PORT_DIPNAME( 0x0400, 0x0000, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x0400, DEF_STR( Off ) ) PORT_DIPSETTING( 0x0000, DEF_STR( On ) ) PORT_DIPNAME( 0x0800, 0x0000, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x0800, DEF_STR( Off ) ) PORT_DIPSETTING( 0x0000, DEF_STR( On ) ) PORT_DIPNAME( 0x1000, 0x0000, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x1000, DEF_STR( Off ) ) PORT_DIPSETTING( 0x0000, DEF_STR( On ) ) PORT_DIPNAME( 0x2000, 0x0000, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x2000, DEF_STR( Off ) ) PORT_DIPSETTING( 0x0000, DEF_STR( On ) ) PORT_DIPNAME( 0x4000, 0x0000, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x4000, DEF_STR( Off ) ) PORT_DIPSETTING( 0x0000, DEF_STR( On ) ) PORT_DIPNAME( 0x8000, 0x0000, DEF_STR( Unknown ) ) PORT_DIPSETTING( 0x8000, DEF_STR( Off ) ) PORT_DIPSETTING( 0x0000, DEF_STR( On ) ) INPUT_PORTS_END ROM_START( hshavoc ) ROM_REGION( 0x200000, "maincpu", 0 ) ROM_LOAD16_BYTE( "d-25.11a", 0x000000, 0x080000, CRC(6a155060) SHA1(ecb47bd428786e50e300a062b5038f943419a389) ) ROM_LOAD16_BYTE( "d-26.9a", 0x000001, 0x080000, CRC(1afa84fe) SHA1(041296e0360b7747aedc2d948c39e06ba03a7d08) ) ROM_REGION( 0x400, "user1", 0 ) // other ROM_LOAD( "peel18cv8s.4b.bin", 0x000, 0x155, CRC(b5fb1d5f) SHA1(f0ac80471d97f77f415b5a1f153e1fce66720963) ) ROM_LOAD( "peel18cv8s.5b.bin", 0x000, 0x155, CRC(efc7ceea) SHA1(1c31a56bc4b83bfa708048b7de4cee7a24537500) ) ROM_REGION( 0x407, "user2", 0 ) ROM_LOAD( "pic16c55.bin", 0x000, 0x407, CRC(7163eb63) SHA1(d9c2cb7d24ce070d43597fabf012ebce47693954) ) // decapped ROM_END void md_boot_state::init_hshavoc() { uint16_t *src = (uint16_t *)memregion("maincpu")->base(); static const uint16_t typedat[16] = { 1,1,1,1, 1,1,1,1, 1,0,0,1, 1,0,1,1 }; /* this decryption is wrong / incomplete, maybe it uses slightly different decryption for opcodes / data */ /* I think the PIC that exists on the PCB controls a state-based encryption... there is a large amount of code encrypted using the same encryption as the data, but all the startup-code + vectors use additional encryption.. maybe the PIC can also patch the code, I'm also concerned that we may decrypt it and find that it runs as the Genesis (no insert coin etc.) version without the PIC, or the PIC supplies additional code in RAM.. but as of yet we can't know */ int rom_size = 0xe8000; for (int x = 0; x < rom_size / 2; x++) { src[x] = bitswap<16>(src[x], 7, 15,6, 14, 5, 2, 1, 10, 13,4, 12,3, 11,0, 8, 9 ); if (typedat[x & 0xf] == 1) src[x] = src[x] ^ 0x0501; else src[x] = src[x] ^ 0x0406; if (src[x] & 0x0400) src[x] ^= 0x0200; if (typedat[x & 0xf] == 0) { if (src[x] & 0x0100) src[x] ^= 0x0004; src[x] = bitswap<16>(src[x], 15,14,13,12, 11,9, 10,8, 7, 6, 5, 4, 3, 2, 1, 0 ); } } /* START e? from e80000 to end you need THIS ALONE to match the genesis rom */ for (int x = rom_size / 2; x < 0x100000 / 2; x++) { src[x] = bitswap<16>(src[x], 7, 15,6, 14, 5, 2, 1, 10, 13,4, 12,3, 11,0, 8, 9 ); src[x] = bitswap<16>(src[x], 15,14,13,12, 11,10,9, 2, 7, 6, 5, 4, 3, 8, 0, 1 ); } /* EMD e80000 - end */ src[0] ^= 0x0107; src[1] ^= 0x0107; src[2] ^= 0x0107; src[3] ^= 0x0707; //? 0701 not 0107 .. conditional 0x600 extra xor?, different 'typemap' ?? /* I'm pretty sure c42 is where the startup code is located, comparing genesis version and this there is at least one jump in the genesis version to the startup code which has been changed to this address in the arcade version. there are several blocks of code like this, all appear to end with a normal rts instruction tho... */ for (int x = 0xc42 / 2; x < 0xc9a / 2; x++) { src[x] ^= 0x0107; //? seems conditional.. src[x] = bitswap<16>(src[x], 15,13,14,12, 11,10,9, 0, 8, 6, 5, 4, 3, 2, 1, 7 ); // probably wrong src[x] ^= 0x0001; // wrong.. } /* Uncommented until actively worked on { FILE*FP; FP = fopen("hshavoc.dump", "wb"); fwrite(src, rom_size / 2, 2, FP); fclose(FP); } */ { address_space &space = m_maincpu->space(AS_PROGRAM); space.nop_write(0x200000, 0x201fff); } init_megadriv(); m_vdp->stop_timers(); } GAME( 1993, hshavoc, 0, md_bootleg, hshavoc, md_boot_state, init_hshavoc, ROT0, "Data East", "High Seas Havoc", MACHINE_NOT_WORKING )