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-rw-r--r--src/mame/drivers/mpu4.cpp52
1 files changed, 0 insertions, 52 deletions
diff --git a/src/mame/drivers/mpu4.cpp b/src/mame/drivers/mpu4.cpp
index dd61303fc78..2be04458a11 100644
--- a/src/mame/drivers/mpu4.cpp
+++ b/src/mame/drivers/mpu4.cpp
@@ -2111,58 +2111,6 @@ void mpu4_state::init_m4default_big()
}
-uint8_t mpu4_state::crystal_sound_r()
-{
- return machine().rand();
-}
-//this may be a YMZ280B
-void mpu4_state::crystal_sound_w(uint8_t data)
-{
- logerror("crystal_sound_w %02x\n",data);
-}
-
-void mpu4_state::init_m_frkstn()
-{
- address_space &space = m_maincpu->space(AS_PROGRAM);
- init_m4default();
- space.install_read_handler(0x0880, 0x0880, read8smo_delegate(*this, FUNC(mpu4_state::crystal_sound_r)));
- space.install_write_handler(0x0881, 0x0881, write8smo_delegate(*this, FUNC(mpu4_state::crystal_sound_w)));
-}
-
-// thanks to Project Amber for descramble information
-static void descramble_crystal( uint8_t* region, int start, int end, uint8_t extra_xor)
-{
- for (int i=start;i<end;i++)
- {
- uint8_t x = region[i];
- switch (i & 0x58)
- {
- case 0x00: // same as 0x08
- case 0x08: x = bitswap<8>( x^0xca , 3,2,1,0,7,4,6,5 ); break;
- case 0x10: x = bitswap<8>( x^0x30 , 3,0,4,6,1,5,7,2 ); break;
- case 0x18: x = bitswap<8>( x^0x89 , 4,1,2,5,7,0,6,3 ); break;
- case 0x40: x = bitswap<8>( x^0x14 , 6,1,4,3,2,5,0,7 ); break;
- case 0x48: x = bitswap<8>( x^0x40 , 1,0,3,2,5,4,7,6 ); break;
- case 0x50: x = bitswap<8>( x^0xcb , 3,2,1,0,7,6,5,4 ); break;
- case 0x58: x = bitswap<8>( x^0xc0 , 2,3,6,0,5,1,7,4 ); break;
- }
- region[i] = x ^ extra_xor;
- }
-}
-
-
-void mpu4_state::init_crystal()
-{
- init_m_frkstn();
- descramble_crystal(memregion( "maincpu" )->base(), 0x0000, 0x10000, 0x00);
-}
-
-void mpu4_state::init_crystali()
-{
- init_m_frkstn();
- descramble_crystal(memregion( "maincpu" )->base(), 0x0000, 0x10000, 0xff); // invert after decrypt?!
-}
-
/* generate a 50 Hz signal (based on an RC time) */
TIMER_DEVICE_CALLBACK_MEMBER(mpu4_state::gen_50hz)
{