SVCCHAOS C decryption program by IQ_132 - http://www.freepgs.com/iq_132/
Some source from:
Halrin - http://www52.tok2.com/home/foge/
MAME - http://www.mame.net
FBA - http://fba.emuunlim.com

you should start with these Cs (from svcchaos)
269-c1.bin 32mb crc(1b608f9c)
269-c2.bin 32mb crc(5a95f294)


you should get these Cs (from svcnd)
269-c1d.bin 8mb crc(465d473b)
269-c2d.bin 8mb crc(3eb28f78)
269-c3d.bin 8mb crc(f4d4ab2b)
269-c4d.bin 8mb crc(a69d523a)
269-c5d.bin 8mb crc(ba2a7892)
269-c6d.bin 8mb crc(37371ca1)
269-c7d.bin 8mb crc(56ac5fb9)
269-c8d.bin 8mb crc(de99e613)

You should also get this completely decrypted and descrambled S rom
269-s1d.bin 512kb crc(772B18DC)