trunk/src/mame/drivers/snesb.c
| r31783 | r31784 | |
|---|
| 844 | 844 | |
| 845 | 845 | DRIVER_INIT_MEMBER(snesb_state,endless) |
| 846 | 846 | { |
| 847 | | INT32 i; |
| 848 | | UINT8 *rom = memregion("user3")->base(); |
| 847 | int i; |
| 848 | UINT8 *src = memregion("user7")->base(); |
| 849 | UINT8 *dst = memregion("user3")->base(); |
| 849 | 850 | |
| 850 | | /* there is more to this, 0x800 based block swaps? */ |
| 851 | | for (i = 0; i < 0x200000; i++) |
| 852 | | { |
| 853 | | rom[i] = rom[i]^0x55; |
| 851 | static const UINT8 address_tab_high[0x40] = { |
| 852 | 0x3b, 0x1d, 0x35, 0x15, 0x39, 0x19, 0x34, 0x13, 0x32, 0x1f, 0x37, 0x17, 0x3d, 0x11, 0x3a, 0x1a, |
| 853 | 0x14, 0x3e, 0x18, 0x36, 0x1e, 0x31, 0x10, 0x3c, 0x1b, 0x3f, 0x16, 0x30, 0x12, 0x38, 0x1c, 0x33, |
| 854 | 0x2b, 0x0d, 0x25, 0x05, 0x29, 0x09, 0x24, 0x03, 0x22, 0x0f, 0x27, 0x07, 0x2d, 0x01, 0x2a, 0x0a, |
| 855 | 0x04, 0x2e, 0x08, 0x26, 0x0e, 0x21, 0x00, 0x2c, 0x0b, 0x2f, 0x06, 0x20, 0x02, 0x28, 0x0c, 0x23 |
| 856 | }; |
| 857 | |
| 858 | static const UINT8 address_tab_low[0x40] = { |
| 859 | 0x14, 0x1d, 0x11, 0x3c, 0x0a, 0x29, 0x2d, 0x2e, 0x30, 0x32, 0x16, 0x36, 0x05, 0x25, 0x26, 0x37, |
| 860 | 0x20, 0x21, 0x27, 0x28, 0x33, 0x34, 0x23, 0x12, 0x1e, 0x1f, 0x3b, 0x24, 0x2c, 0x35, 0x38, 0x39, |
| 861 | 0x3d, 0x0c, 0x2a, 0x0d, 0x22, 0x18, 0x19, 0x1a, 0x03, 0x08, 0x04, 0x3a, 0x0b, 0x0f, 0x15, 0x17, |
| 862 | 0x1b, 0x13, 0x00, 0x1c, 0x2b, 0x01, 0x06, 0x2f, 0x07, 0x09, 0x02, 0x31, 0x10, 0x0e, 0x3f, 0x3e |
| 863 | }; |
| 864 | |
| 865 | static const UINT8 data_high[16] = { |
| 866 | 0x88, 0x38, 0x10, 0x98, 0x90, 0x00, 0x08, 0x18, 0x20, 0xb8, 0xa8, 0xa0, 0x30, 0x80, 0x28, 0xb0 |
| 867 | }; |
| 868 | |
| 869 | static const UINT8 data_low[16] = { |
| 870 | 0x41, 0x46, 0x02, 0x43, 0x03, 0x00, 0x40, 0x42, 0x04, 0x47, 0x45, 0x05, 0x06, 0x01, 0x44, 0x07 |
| 871 | }; |
| 872 | |
| 873 | for (i = 0; i < 0x200000; i++) { |
| 874 | int j = (address_tab_high[i >> 15] << 15) + (i & 0x7fc0) + address_tab_low[i & 0x3f]; |
| 875 | |
| 876 | dst[i] = data_high[src[j]>>4] | data_low[src[j]&0xf]; |
| 877 | |
| 878 | if (i >= 0x00000 && i < 0x10000) { |
| 879 | dst[i] = BITSWAP8(dst[i],2,3,4,1,7,0,6,5); |
| 880 | } |
| 881 | |
| 882 | if (i >= 0x10000 && i < 0x20000) { |
| 883 | dst[i] = BITSWAP8(dst[i],1,5,6,0,2,4,7,3) ^ 0xff; |
| 884 | } |
| 885 | |
| 886 | if (i >= 0x20000 && i < 0x30000) { |
| 887 | dst[i] = BITSWAP8(dst[i],3,0,1,6,4,5,2,7); |
| 888 | } |
| 889 | |
| 890 | if (i >= 0x30000 && i < 0x40000) { |
| 891 | dst[i] = BITSWAP8(dst[i],0,4,2,3,5,6,7,1) ^ 0xff; |
| 892 | } |
| 854 | 893 | } |
| 855 | 894 | |
| 856 | 895 | DRIVER_INIT_CALL(snes); |