Schachcomputer.info Community - MessEmu: A HALF patch for SciSys Chess Champion Super System MK IV

Hi ,

I have finish the patch for the Novag Super system IV.

However, because there is no place for the patch (12k fully used), I
have added a rom file of 256 bytes for the patch, implemented in CF00.
This binary file "patch_castling-lrom" should be added to rom file ssystem4.zip.

Code:



0000 : 20 A3 FF A9 00 85 21 A9

0008 : 08 A6 D7 E0 84 D0 04 05

0010 : 21 85 21 A9 04 A6 DE E0

0018 : 84 D0 04 05 21 85 21 A9

0020 : 02 A6 67 E0 44 D0 04 05

0028 : 21 85 21 A9 01 A6 6E E0

0030 : 44 D0 04 05 21 85 21 60

0038 : FF FF FF FF FF FF FF FF

0040 : FF FF FF FF FF FF FF FF

0048 : FF FF FF FF FF FF FF FF

0050 : FF FF FF FF FF FF FF FF

0058 : FF FF FF FF FF FF FF FF

0060 : FF FF FF FF FF FF FF FF

0068 : FF FF FF FF FF FF FF FF

0070 : FF FF FF FF FF FF FF FF

0078 : FF FF FF FF FF FF FF FF

0080 : FF FF FF FF FF FF FF FF

0088 : FF FF FF FF FF FF FF FF

0090 : FF FF FF FF FF FF FF FF

0098 : FF FF FF FF FF FF FF FF

00A0 : FF FF FF FF FF FF FF FF

00A8 : FF FF FF FF FF FF FF FF

00B0 : FF FF FF FF FF FF FF FF

00B8 : FF FF FF FF FF FF FF FF

00C0 : FF FF FF FF FF FF FF FF

00C8 : FF FF FF FF FF FF FF FF

00D0 : FF FF FF FF FF FF FF FF

00D8 : FF FF FF FF FF FF FF FF

00E0 : FF FF FF FF FF FF FF FF

00E8 : FF FF FF FF FF FF FF FF

00F0 : FF FF FF FF FF FF FF FF

00F8 : FF FF FF FF FF FF FF FF



The calling of the patch is implemented in D84F :



D84F : 4C 00 CF   in place of  20 A3 FF .





Modifications in ssystem3.cpp : 



ROM_LOAD("patch_castling-lrom", 0xcf00, 0x0100, CRC(08C339C3) SHA1(633FE10EAC04C3DDB1FA4956244C76B1D689D02B) ) // patch 

ROM_LOAD("c45021_ss4-lrom"    , 0xd000, 0x1000, CRC(14E99641) SHA1(AAFF8588CB14084FABEE53B63AF70566A4C10FFA) ) // 2332    



You have to add the last line in the ssystem4_map  :



void ssystem3_state::ssystem4_map(address_map &map)                 

{                                                                   

        map(0x0000, 0x03ff).ram();                                  

        map(0x4400, 0x440f).m(m_via, FUNC(via6522_device::map));    

        map(0x4800, 0x48ff).noprw(); // no nvram                    

        map(0xcf00, 0xffff).rom();    // added for patch                              

}                                                                   

                        



Do not forget to make a new compilation of mame.



There's no need to make a “New Game” before entering in EP mode.

Cordialy,

mychess