Thanks for the replies
One of the things I realised whilst doing abit more research (although this may have been obvious to some people) is that all the games that are incompatible with the lockout chip disabled use a SNES 'enhancement chip' of some kind, such as the SA-1 (Super Mario RPG) or S-DD1 (Street Fighter Alpha 2)
Now you may be wondering whats so special about these two enhancement chips compared to the Super FX or DSP chips, Well the CIC security chip in these games has actually been combined with the extra processor chip! Its not a separate security chip anymore as it is in most other games. So now this CIC security chip actually has control over something - it can disable this extra processor so the game wont run
Hence why these particular games have problems when the consoles lockout chip is disabled.
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One interesting thing I found out about the SA-1 and S-DD1 chips that seems to be relatively unknown is that the CIC/security chip thats inside the processor can actually be 'switched' to be either NTSC or PAL! No other Nintendo CIC security chip that I know off can be configured in this way.
On the SA-1 chip if Pin 127 is connected to Ground the internal CIC will be NTSC and if its connected to VCC it will be PAL. See these pictures of the rear of a carts PCB for comparison (The key difference is circled in red):-
SA-1 NTSC (GND)-----------------SA-1 PAL (VCC)
(Game is Kirby Super Star/Kirby's Fun Pak)
On the S-DD1 chip if Pin 82 is connected to Ground the internal CIC will be NTSC and if its connected to VCC it will be PAL. See these pictures of the rear of a carts PCB for comparison (The key difference is circled in red):-
S-DD1 NTSC (GND)-------------S-DD1 PAL (VCC)
(Game is Street Fighter Alpha 2)
All pictures taken from SNES Central:-
http://www.snescentral.com/If you are interested in modding these games for your region all you need to do is lift the particular leg on the chip and then connect it to whichever point you need for your region. You must have a working/enabled console lockout chip though
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Although configuring each game to work on NTSC or PAL consoles is one solution, its not really what I am aiming for as it still requires the consoles lockout chip to be fully working
However, after abit of research I am pretty confident I have a solution that should work (Although I havent tested it yet!) Basically theres four main signals that go from the SNES console to the carts CIC. Three of them come from the consoles CIC, they are:-
CIC Data In
CIC Data Out
CIC Reset Signal
and the last one is a separate Clock signal.
Now after reading a few old threads and your replies im pretty confident that if I remove either the Clock signal, the Reset signal, or both, that this will allow these games to work...
I have just bought an SA-1 game for testing and when it arrives I will experiment with removing different signals and let you know how I get on - wish me luck!
