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Diffstat (limited to 'src/devices/bus/neogeo/kof98_prot.cpp')
-rw-r--r--src/devices/bus/neogeo/kof98_prot.cpp141
1 files changed, 141 insertions, 0 deletions
diff --git a/src/devices/bus/neogeo/kof98_prot.cpp b/src/devices/bus/neogeo/kof98_prot.cpp
new file mode 100644
index 00000000000..fefe7c190d3
--- /dev/null
+++ b/src/devices/bus/neogeo/kof98_prot.cpp
@@ -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));
+}