The Chocobo racing fix nop's this first instruction:
.text:0076EC32 0F BF 94 01 B8 86 01 00 movsx edx, word ptr [ecx+eax+186B8h]
.text:0076EC3A 83 C2 03 add edx, 3
I don't think nop'ing it is the correct thing to do. edx's value is left over from a previous array lookup (low word) and a multiply (high word). If anything it should be "xor edx, edx".
I wonder what this code does on the R3000. On the PSX, 0 was a valid memory address, so it would not have crashed here either. I wouldn't know whether this code actually exists, since ~100k seems like an absurdly large memory structure in a 2 meg environment.