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-rw-r--r--src/mame/drivers/atarigx2.cpp42
-rw-r--r--src/mame/includes/atarigx2.h8
-rw-r--r--src/mame/machine/atarixga.cpp299
-rw-r--r--src/mame/machine/atarixga.h54
4 files changed, 383 insertions, 20 deletions
diff --git a/src/mame/drivers/atarigx2.cpp b/src/mame/drivers/atarigx2.cpp
index 5f73dfd9434..178fda2567b 100644
--- a/src/mame/drivers/atarigx2.cpp
+++ b/src/mame/drivers/atarigx2.cpp
@@ -5,6 +5,9 @@
Atari GX2 hardware
driver by Aaron Giles
+
+ Moto Frenzy protection reverse engineered by:
+ Morten Shearman Kirkegaard, Samuel Neves, Peter Wilhelmsen
Games supported:
* Space Lords (1992)
@@ -12,7 +15,7 @@
* Road Riot's Revenge Rally (1993)
Known bugs:
- * protection devices unknown
+ * Unemulated protection for Space Lords and Road Riot's Revenge
****************************************************************************
@@ -125,10 +128,11 @@ WRITE32_MEMBER(atarigx2_state::mo_command_w)
/*************************************
*
- * Protection?
+ * Protection (non-working, legacy)
*
*************************************/
+/* Note: Will all eventually be handled in machine/atarixga.cpp */
WRITE32_MEMBER(atarigx2_state::atarigx2_protection_w)
{
@@ -143,16 +147,16 @@ WRITE32_MEMBER(atarigx2_state::atarigx2_protection_w)
logerror("%06X:Protection W@%04X = %04X\n", pc, offset * 4 + 2, data);
}
- COMBINE_DATA(&m_protection_base[offset]);
+ COMBINE_DATA(&m_protection_ram[offset]);
if (ACCESSING_BITS_16_31)
{
- m_last_write = m_protection_base[offset] >> 16;
+ m_last_write = m_protection_ram[offset] >> 16;
m_last_write_offset = offset*2;
}
if (ACCESSING_BITS_0_15)
{
- m_last_write = m_protection_base[offset] & 0xffff;
+ m_last_write = m_protection_ram[offset] & 0xffff;
m_last_write_offset = offset*2+1;
}
}
@@ -1138,7 +1142,7 @@ READ32_MEMBER(atarigx2_state::atarigx2_protection_r)
{ 0xffffffff, 0xffff }
};
- UINT32 result = m_protection_base[offset];
+ UINT32 result = m_protection_ram[offset];
if (offset == 0x300)
result |= 0x80000000;
@@ -1175,6 +1179,12 @@ READ32_MEMBER(atarigx2_state::atarigx2_protection_r)
}
+READ32_MEMBER( atarigx2_state::rrreveng_prot_r )
+{
+ return 0;
+}
+
+
/*************************************
*
* Main CPU memory handlers
@@ -1185,7 +1195,6 @@ static ADDRESS_MAP_START( main_map, AS_PROGRAM, 32, atarigx2_state )
ADDRESS_MAP_UNMAP_HIGH
AM_RANGE(0x000000, 0x07ffff) AM_ROM
AM_RANGE(0xc80000, 0xc80fff) AM_RAM
- AM_RANGE(0xca0000, 0xca0fff) AM_READWRITE(atarigx2_protection_r, atarigx2_protection_w) AM_SHARE("protection_base")
AM_RANGE(0xd00000, 0xd1ffff) AM_READ(a2d_data_r)
AM_RANGE(0xd20000, 0xd20fff) AM_DEVREADWRITE8("eeprom", atari_eeprom_device, read, write, 0xff00ff00)
AM_RANGE(0xd40000, 0xd40fff) AM_RAM_DEVWRITE("palette", palette_device, write) AM_SHARE("palette")
@@ -1459,6 +1468,8 @@ static MACHINE_CONFIG_START( atarigx2, atarigx2_state )
MCFG_MACHINE_RESET_OVERRIDE(atarigx2_state,atarigx2)
+ MCFG_DEVICE_ADD("xga", ATARI_XGA, 0);
+
MCFG_ATARI_EEPROM_2816_ADD("eeprom")
/* video hardware */
@@ -2209,6 +2220,7 @@ ROM_END
DRIVER_INIT_MEMBER(atarigx2_state,spclords)
{
m_playfield_base = 0x000;
+ m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0xca0000, 0xca0fff, read32_delegate(FUNC(atarigx2_state::atarigx2_protection_r),this), write32_delegate(FUNC(atarigx2_state::atarigx2_protection_w),this));
}
@@ -2237,22 +2249,18 @@ XMEM=68.A23*E.A22*!E.A21*68.A20 = 1101 xxxx = d0
+68.A23*E.A22*!E.A21*!68.A20*68.A19 = 1100 1xxx = c80000-cfffff
+!68.A23*!E.A22*!E.A21 = 000x xxxx = 000000-1fffff
*/
-}
-
-READ32_MEMBER(atarigx2_state::rrreveng_prot_r)
-{
- return 0;
+ m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0xca0000, 0xca0fff, read32_delegate(FUNC(atari_xga_device::read),&(*m_xga)), write32_delegate(FUNC(atari_xga_device::write),&(*m_xga)));
}
DRIVER_INIT_MEMBER(atarigx2_state,rrreveng)
{
m_playfield_base = 0x000;
+ m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0xca0000, 0xca0fff, read32_delegate(FUNC(atarigx2_state::atarigx2_protection_r),this), write32_delegate(FUNC(atarigx2_state::atarigx2_protection_w),this));
m_maincpu->space(AS_PROGRAM).install_read_handler(0xca0fc0, 0xca0fc3, read32_delegate(FUNC(atarigx2_state::rrreveng_prot_r),this));
}
-
/*************************************
*
* Game driver(s)
@@ -2264,10 +2272,10 @@ GAME( 1992, spclordsb, spclords, atarigx2_0x400, spclords, atarigx2_state, spclo
GAME( 1992, spclordsg, spclords, atarigx2_0x400, spclords, atarigx2_state, spclords, ROT0, "Atari Games", "Space Lords (rev A, German)", MACHINE_UNEMULATED_PROTECTION | MACHINE_NOT_WORKING )
GAME( 1992, spclordsa, spclords, atarigx2_0x400, spclords, atarigx2_state, spclords, ROT0, "Atari Games", "Space Lords (rev A)", MACHINE_UNEMULATED_PROTECTION | MACHINE_NOT_WORKING )
-GAME( 1992, motofren, 0, atarigx2_0x200, motofren, atarigx2_state, motofren, ROT0, "Atari Games", "Moto Frenzy", MACHINE_UNEMULATED_PROTECTION | MACHINE_NOT_WORKING )
-GAME( 1992, motofrenmd, motofren, atarigx2_0x200, motofren, atarigx2_state, motofren, ROT0, "Atari Games", "Moto Frenzy (Mini Deluxe)", MACHINE_UNEMULATED_PROTECTION | MACHINE_NOT_WORKING )
-GAME( 1992, motofrenft, motofren, atarigx2_0x200, motofren, atarigx2_state, motofren, ROT0, "Atari Games", "Moto Frenzy (Field Test Version)", MACHINE_UNEMULATED_PROTECTION | MACHINE_NOT_WORKING )
-GAME( 1992, motofrenmf, motofren, atarigx2_0x200, motofren, atarigx2_state, motofren, ROT0, "Atari Games", "Moto Frenzy (Mini Deluxe Field Test Version)", MACHINE_UNEMULATED_PROTECTION | MACHINE_NOT_WORKING )
+GAME( 1992, motofren, 0, atarigx2_0x200, motofren, atarigx2_state, motofren, ROT0, "Atari Games", "Moto Frenzy", 0 )
+GAME( 1992, motofrenmd, motofren, atarigx2_0x200, motofren, atarigx2_state, motofren, ROT0, "Atari Games", "Moto Frenzy (Mini Deluxe)", 0 )
+GAME( 1992, motofrenft, motofren, atarigx2_0x200, motofren, atarigx2_state, motofren, ROT0, "Atari Games", "Moto Frenzy (Field Test Version)", 0 )
+GAME( 1992, motofrenmf, motofren, atarigx2_0x200, motofren, atarigx2_state, motofren, ROT0, "Atari Games", "Moto Frenzy (Mini Deluxe Field Test Version)", 0 )
GAME( 1993, rrreveng, 0, atarigx2_0x400, rrreveng, atarigx2_state, rrreveng, ROT0, "Atari Games", "Road Riot's Revenge (prototype, Sep 06, 1994)", MACHINE_UNEMULATED_PROTECTION | MACHINE_NOT_WORKING )
GAME( 1993, rrrevenga, rrreveng, atarigx2_0x400, rrreveng, atarigx2_state, rrreveng, ROT0, "Atari Games", "Road Riot's Revenge (prototype, Jan 27, 1994, set 1)", MACHINE_UNEMULATED_PROTECTION | MACHINE_NOT_WORKING )
diff --git a/src/mame/includes/atarigx2.h b/src/mame/includes/atarigx2.h
index e0393e3b22e..1cf61d8ecac 100644
--- a/src/mame/includes/atarigx2.h
+++ b/src/mame/includes/atarigx2.h
@@ -7,8 +7,8 @@
*************************************************************************/
#include "machine/atarigen.h"
+#include "machine/atarixga.h"
#include "audio/atarijsa.h"
-#include "includes/slapstic.h"
class atarigx2_state : public atarigen_state
@@ -17,8 +17,8 @@ public:
atarigx2_state(const machine_config &mconfig, device_type type, const char *tag)
: atarigen_state(mconfig, type, tag),
m_jsa(*this, "jsa"),
+ m_xga(*this, "xga"),
m_mo_command(*this, "mo_command"),
- m_protection_base(*this, "protection_base"),
m_playfield_tilemap(*this, "playfield"),
m_alpha_tilemap(*this, "alpha"),
m_rle(*this, "rle")
@@ -27,9 +27,9 @@ public:
UINT16 m_playfield_base;
required_device<atari_jsa_iiis_device> m_jsa;
+ required_device<atari_xga_device> m_xga;
required_shared_ptr<UINT32> m_mo_command;
- required_shared_ptr<UINT32> m_protection_base;
required_device<tilemap_device> m_playfield_tilemap;
required_device<tilemap_device> m_alpha_tilemap;
@@ -41,8 +41,10 @@ public:
UINT16 m_playfield_xscroll;
UINT16 m_playfield_yscroll;
+ // LEGACY PROTECTION
UINT16 m_last_write;
UINT16 m_last_write_offset;
+ UINT32 m_protection_ram[0x1000];
virtual void update_interrupts() override;
virtual void scanline_update(screen_device &screen, int scanline) override;
diff --git a/src/mame/machine/atarixga.cpp b/src/mame/machine/atarixga.cpp
new file mode 100644
index 00000000000..ac423c9c641
--- /dev/null
+++ b/src/mame/machine/atarixga.cpp
@@ -0,0 +1,299 @@
+// license:BSD-3-Clause
+// copyright-holders:Morten Shearman Kirkegaard, Samuel Neves, Peter Wilhelmsen
+/*************************************************************************
+
+ atarixga.cpp
+
+ Atari XGA encryption FPGA
+
+ **************************************************************************
+
+ Part numbers:
+
+ 136094-0072 Moto Frenzy
+ 136095-0072 Space Lords
+ ? Road Riot's Revenge
+ 136094-0004A Primal Rage
+ ? T-Mek
+
+*************************************************************************/
+
+#include "atarixga.h"
+
+
+extern const device_type ATARI_XGA = &device_creator<atari_xga_device>;
+
+atari_xga_device::atari_xga_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+: device_t(mconfig, ATARI_XGA, "Atari XGA", tag, owner, clock, "xga", __FILE__),
+ m_mode(FPGA_RESET),
+ m_address(0),
+ m_ciphertext(0)
+{
+}
+
+
+
+/*************************************
+ *
+ * Initialization
+ *
+ *************************************/
+
+void atari_xga_device::device_start()
+{
+ m_ram = std::make_unique<UINT16[]>(RAM_WORDS);
+
+ save_pointer(NAME(m_ram.get()), RAM_WORDS * sizeof(UINT16));
+ save_item(NAME(m_address));
+ save_item(NAME(m_ciphertext));
+}
+
+void atari_xga_device::device_reset()
+{
+ memset(m_ram.get(), 0, RAM_WORDS * sizeof(UINT16));
+ m_mode = FPGA_RESET;
+ m_address = 0;
+ m_ciphertext = 0;
+}
+
+
+
+/*************************************
+ *
+ * Definitions
+ *
+ *************************************/
+
+// TODO: Add definitions for other games
+// Moto Frenzy
+
+/* key 0x10 is special, it has 15 "identical twins". */
+static const UINT8 kmap[128] =
+{
+ 0x6B,0x11,0x1B,0x19,0x4B,0x50,0x17,0x09,
+ 0x5D,0x69,0x43,0x33,0x0F,0x0C,0x28,0x3F,
+ 0x00,0x20,0x15,0x3C,0x57,0x38,0x00,0x07,
+ 0x49,0x25,0x61,0x2F,0x2B,0x4E,0x64,0x00,
+ 0x45,0x41,0x6D,0x52,0x31,0x66,0x22,0x59,
+ 0x00,0x70,0x6F,0x5B,0x46,0x6E,0x67,0x5A,
+ 0x26,0x30,0x2C,0x65,0x21,0x3D,0x58,0x00,
+ 0x5E,0x44,0x0D,0x40,0x6C,0x1C,0x51,0x0A,
+ 0x35,0x2A,0x13,0x4D,0x63,0x00,0x00,0x3A,
+ 0x00,0x48,0x54,0x24,0x60,0x1E,0x2E,0x01,
+ 0x56,0x03,0x37,0x00,0x04,0x00,0x05,0x06,
+ 0x00,0x55,0x1F,0x02,0x36,0x14,0x00,0x3B,
+ 0x5F,0x0E,0x1D,0x0B,0x27,0x2D,0x3E,0x00,
+ 0x00,0x5C,0x47,0x68,0x42,0x53,0x32,0x23,
+ 0x4A,0x62,0x4F,0x00,0x00,0x16,0x39,0x08,
+ 0x6A,0x34,0x10,0x29,0x12,0x1A,0x4C,0x18
+};
+
+
+
+/*************************************
+ *
+ * Decryption
+ *
+ *************************************/
+
+UINT16 atari_xga_device::ctz(UINT16 x)
+{
+ UINT16 n = 0;
+ if (x == 0) return 16;
+ if (!(x & 0x00FF)) n += 8, x >>= 8;
+ if (!(x & 0x000F)) n += 4, x >>= 4;
+ if (!(x & 0x0003)) n += 2, x >>= 2;
+ if (!(x & 0x0001)) n += 1, x >>= 1;
+ return n;
+}
+
+size_t atari_xga_device::popcount(UINT16 x)
+{
+ size_t count = 0;
+ while (x != 0)
+ {
+ count += 1;
+ x &= x - 1;
+ }
+ return count;
+}
+
+UINT16 atari_xga_device::parity(UINT16 x)
+{
+ return popcount(x) & 1;
+}
+
+UINT16 atari_xga_device::lfsr1(UINT16 x)
+{
+ UINT16 bit = parity(x & 0x8016);
+ return (x << 1) | bit;
+}
+
+UINT16 atari_xga_device::lfsr2(UINT16 x)
+{
+ UINT16 bit = parity(x & 0x002D);
+ return (x >> 1) | (bit << 15);
+}
+
+UINT16 atari_xga_device::powers2(UINT8 k, UINT16 x)
+{
+ static const UINT16 L[16] =
+ {
+ 0x5E85,0xBD0B,0x2493,0x17A3,
+ 0x2F47,0x0005,0x000B,0x0017,
+ 0x002F,0x005E,0x00BD,0x017A,
+ 0x02F4,0x05E8,0x0BD0,0x17A1
+ };
+
+ UINT16 t = (x == 16) ? (L[4] ^ L[5]) : L[x];
+
+ for (size_t i = 0; i < k; ++i)
+ {
+ t = lfsr1(t);
+ }
+
+ return t;
+}
+
+UINT16 atari_xga_device::decipher(UINT8 k, UINT16 c)
+{
+ UINT16 bit, i, p = 0;
+
+ /* Only 128 keys internally, if high bit set,
+ then find the 7-bit "twin" by xor 0xA8. */
+ if (k & 0x80)
+ k ^= 0xA8;
+
+ k = kmap[k];
+
+ if ((c & (c - 1)) == 0)
+ {
+ return powers2(k, ctz(c));
+ }
+
+ for (bit = 0; bit < 5; ++bit)
+ {
+ if ((c >> bit) & 1)
+ {
+ p ^= powers2(k, bit);
+ }
+ }
+
+ for (bit = 5; bit < 16; ++bit)
+ {
+ if ((c >> bit) & 1)
+ {
+ p ^= powers2(k, bit + 1);
+ }
+ }
+
+ UINT16 x = 0x8010;
+ for (i = 0; i < k + 3; ++i)
+ {
+ if (x == c)
+ {
+ return (p == 1) ? 0 : lfsr2(p);
+ }
+ x = lfsr2(x);
+ }
+
+ return p;
+}
+
+
+
+/*************************************
+ *
+ * Write/Read access
+ *
+ *************************************/
+
+WRITE32_MEMBER(atari_xga_device::write)
+{
+ switch (m_mode)
+ {
+ case FPGA_RESET:
+ return;
+
+ case FPGA_SETKEY:
+ /* Write table to FPGA SRAM. */
+ if (ACCESSING_BITS_16_31)
+ m_ram[offset << 1] = UINT16 (data >> 16);
+ if (ACCESSING_BITS_0_15)
+ m_ram[(offset << 1) + 1] = UINT16(data & 0xFFFF);
+
+ break;
+
+ case FPGA_DECIPHER:
+ /* Send Ciphertext to FPGA for decryption. */
+ if (ACCESSING_BITS_16_31)
+ {
+ m_address = offset << 2;
+ m_ciphertext = UINT16(data >> 16);
+ }
+ if (ACCESSING_BITS_0_15)
+ {
+ m_address = (offset << 2) + 2;
+ m_ciphertext = UINT16(data & 0xFFFF);
+ }
+ break;
+ }
+}
+
+READ32_MEMBER(atari_xga_device::read)
+{
+ UINT32 plaintext = 0;
+
+ switch (offset << 2)
+ {
+ case 0x0FC0:
+ m_mode = FPGA_RESET;
+ break;
+ case 0x0010:
+ m_mode = FPGA_SETKEY;
+ break;
+ case 0x0020:
+ m_mode = FPGA_DECIPHER;
+ break;
+ }
+
+ if (m_mode == FPGA_RESET)
+ {
+ return 0;
+ }
+
+ if (m_mode == FPGA_DECIPHER)
+ {
+ UINT16 address = (offset << 2) - 0x400;
+
+ if (ACCESSING_BITS_0_15)
+ address += 2;
+
+ /* Reply with decrypted plaintext */
+ if (address == m_address)
+ {
+ UINT16 key_offset, key_byte;
+
+ /* Algorithm to select key byte based on offset. */
+ key_offset = ((((address >> 4) & 1) ^ 1) << 0)
+ ^ ((((address >> 2) & 1) ^ 0) << 1)
+ ^ ((((address >> 8) & 1) ^ 0) << 2)
+ ^ ((((address >> 3) & 1) ^ 1) << 3)
+ ^ ((((address >> 1) & 1) ^ 1) << 4)
+ ^ ((((address >> 6) & 1) ^ 0) << 5)
+ ^ ((((address >> 7) & 1) ^ 0) << 6)
+ ^ ((((address >> 5) & 1) ^ 1) << 7)
+ ^ ((((address >> 9) & 1) ^ 0) << 8)
+ ^ ((((address >> 10) & 1) ^ 0) << 9);
+ key_byte = m_ram[key_offset];
+
+ /* And now for the full magic. */
+ plaintext = decipher(key_byte, m_ciphertext);
+
+ if (ACCESSING_BITS_16_31)
+ plaintext <<= 16;
+ }
+ }
+
+ return plaintext;
+}
diff --git a/src/mame/machine/atarixga.h b/src/mame/machine/atarixga.h
new file mode 100644
index 00000000000..710aedb22c2
--- /dev/null
+++ b/src/mame/machine/atarixga.h
@@ -0,0 +1,54 @@
+// license:BSD-3-Clause
+// copyright-holders:Morten Shearman Kirkegaard, Samuel Neves, Peter Wilhelmsen
+/*************************************************************************
+
+ atarixga.h
+
+ Atari XGA encryption FPGA
+
+*************************************************************************/
+
+#ifndef __MACHINE_ATARIXGA__
+#define __MACHINE_ATARIXGA__
+
+extern const device_type ATARI_XGA;
+
+class atari_xga_device : public device_t
+{
+public:
+ // construction/destruction
+ atari_xga_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ DECLARE_WRITE32_MEMBER(write);
+ DECLARE_READ32_MEMBER(read);
+
+protected:
+ virtual void device_start() override;
+ virtual void device_reset() override;
+
+private:
+ static const size_t RAM_WORDS = 2048;
+
+ enum fpga_mode
+ {
+ FPGA_RESET,
+ FPGA_SETKEY,
+ FPGA_DECIPHER
+ };
+
+ UINT16 powers2(UINT8 k, UINT16 x);
+ UINT16 lfsr2(UINT16 x);
+ UINT16 lfsr1(UINT16 x);
+ UINT16 parity(UINT16 x);
+ size_t popcount(UINT16 x);
+ UINT16 ctz(UINT16 x);
+ UINT16 decipher(UINT8 k, UINT16 c);
+
+ fpga_mode m_mode;
+ UINT16 m_address; // last written address
+ UINT16 m_ciphertext; // last written ciphertext
+ std::unique_ptr<UINT16[]> m_ram; // CY7C185-45PC, only 16-Kbit used
+};
+
+
+#endif