diff options
Diffstat (limited to 'src/devices/bus/neogeo/kof98_prot.c')
-rw-r--r-- | src/devices/bus/neogeo/kof98_prot.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/src/devices/bus/neogeo/kof98_prot.c b/src/devices/bus/neogeo/kof98_prot.c new file mode 100644 index 00000000000..fefe7c190d3 --- /dev/null +++ b/src/devices/bus/neogeo/kof98_prot.c @@ -0,0 +1,141 @@ +// license:BSD-3-Clause +// copyright-holders:S. Smith,David Haywood + + +#include "emu.h" +#include "kof98_prot.h" + + + +extern const device_type KOF98_PROT = &device_creator<kof98_prot_device>; + + +kof98_prot_device::kof98_prot_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : device_t(mconfig, KOF98_PROT, "NeoGeo Protection (KOF98)", tag, owner, clock, "kof98_prot", __FILE__) +{ +} + + +void kof98_prot_device::device_start() +{ +} + +void kof98_prot_device::device_reset() +{ + kof98_prot_state = 0; +} + + +/* Kof98 uses an early encryption, quite different from the others */ +void kof98_prot_device::kof98_decrypt_68k(UINT8* cpurom, UINT32 cpurom_size) +{ + UINT8 *src = cpurom; + dynamic_buffer dst(0x200000); + int i, j, k; + static const UINT32 sec[]={0x000000,0x100000,0x000004,0x100004,0x10000a,0x00000a,0x10000e,0x00000e}; + static const UINT32 pos[]={0x000,0x004,0x00a,0x00e}; + + memcpy( &dst[0], src, 0x200000); + for( i=0x800; i<0x100000; i+=0x200 ) + { + for( j=0; j<0x100; j+=0x10 ) + { + for( k=0; k<16; k+=2) + { + memcpy( &src[i+j+k], &dst[ i+j+sec[k/2]+0x100 ], 2 ); + memcpy( &src[i+j+k+0x100], &dst[ i+j+sec[k/2] ], 2 ); + } + if( i >= 0x080000 && i < 0x0c0000) + { + for( k=0; k<4; k++ ) + { + memcpy( &src[i+j+pos[k]], &dst[i+j+pos[k]], 2 ); + memcpy( &src[i+j+pos[k]+0x100], &dst[i+j+pos[k]+0x100], 2 ); + } + } + else if( i >= 0x0c0000 ) + { + for( k=0; k<4; k++ ) + { + memcpy( &src[i+j+pos[k]], &dst[i+j+pos[k]+0x100], 2 ); + memcpy( &src[i+j+pos[k]+0x100], &dst[i+j+pos[k]], 2 ); + } + } + } + memcpy( &src[i+0x000000], &dst[i+0x000000], 2 ); + memcpy( &src[i+0x000002], &dst[i+0x100000], 2 ); + memcpy( &src[i+0x000100], &dst[i+0x000100], 2 ); + memcpy( &src[i+0x000102], &dst[i+0x100100], 2 ); + } + memmove( &src[0x100000], &src[0x200000], 0x400000 ); + + UINT16* mem16 = (UINT16*)cpurom; + m_default_rom[0] = mem16[0x100 / 2]; + m_default_rom[1] = mem16[0x102 / 2]; + + +} + + +/************************ King of Fighters 98******************* + The encrypted set has a rom overlay feature, checked at + various points in the game. + Boards used: NEO-MVS PROGSF1 (1998.6.17) / NEO-MVS PROGSF1E (1998.6.18) + The boards have an ALTERA chip (EPM7128SQC100-15) which is tied to 242-P1 +***************************************************************/ + +READ16_MEMBER(kof98_prot_device::kof98_prot_r) +{ + if (kof98_prot_state == 1) + { + if (!offset) + return 0x00c2; + else + return 0x00fd; + } + if (kof98_prot_state == 2) + { + if (!offset) + return 0x4e45; + else + return 0x4f2d; + } + + if (!offset) + return m_default_rom[0]; + else + return m_default_rom[1]; + + // never executed + //return 0xffff; +} + +WRITE16_MEMBER( kof98_prot_device::kof98_prot_w ) +{ + /* info from razoola */ + switch (data) + { + case 0x0090: + logerror ("%06x kof98 - protection 0x0090x\n", space.device().safe_pc()); + kof98_prot_state = 1; + break; + + case 0x00f0: + logerror ("%06x kof98 - protection 0x00f0x\n", space.device().safe_pc()); + kof98_prot_state = 2; + break; + + default: // 00aa is written, but not needed? + logerror ("%06x kof98 - unknown protection write %04x\n", space.device().safe_pc(), data); + break; + } +} + + +void kof98_prot_device::install_kof98_protection(cpu_device* maincpu) +{ + /* when 0x20aaaa contains 0x0090 (word) then 0x100 (normally the neogeo header) should return 0x00c200fd worked out using real hw */ + maincpu->space(AS_PROGRAM).install_read_handler(0x00100, 0x00103, read16_delegate(FUNC(kof98_prot_device::kof98_prot_r),this)); + + maincpu->space(AS_PROGRAM).install_write_handler(0x20aaaa, 0x20aaab, write16_delegate(FUNC(kof98_prot_device::kof98_prot_w),this)); +} |