Hi everybody!


I am really interested in how SNES CIC chip works and what codes it sends to cartridge's CIC in order to release the reset on the CPU. I have been looking around for that info but what I got is only that CIC chip is a 4-byte CPU with and embedded ROM, but that doesn't help me. I would like something more precise, more technical, to know what data both CIC (lock and key, but I think both are exactly the same) exchange after reset.

Thank you!

Uh, guys, he's legit. He's a Spanish romhacker. I can vouch for him. Sorta.

Dammit, I told SpctrmXD to tell you guys to submit your patches to this site. What the hell happened to Nekein anyway? Did jonas finally go nuts or something?

(Con una... ¡le DIJE a SpctrmXD que les pasara el recado! Más vale que pongan sus traducciones en este servidor, al cabo es fácil. Y lo digo por TODOS. Más vale tener un sitio de respaldo por si las dudas. ¿Y que diablos le pasó a jonas? ¿Ya se volvió loco y nomás mató el servidor o tuvo problemas financieros o que?)

Thanks for the answer, Nightcrawler, but I already owned all that info.

Maybe I should explain what I am looking for exactly. My aim is to develop an VHDL design with some of the most famous chips in SNES cartridges to deploy them in FPGAs like Spartan II and such. I currently work in that field of electronics and my skills at desinging chips are increasing fast. I would like, for example, to desing an S-DD1 chip how runs just exactly as the one in Star Ocean and Street Fighter Alpha 2. That chips has a lockup circuitry just as CIC's one, so I wanted to know EXACTLY which data is sent from key CIC in the cartridge to the SNES one and viceversa. If I get that info, I could implement the CIC inside that VHDL design to fully emulate the S-DD1.

I don't really need to know HOW it works, but WHAT exactly it does to work.

Thanks again.

If you're that deep into electronics, stay after work and just hook it up to an oscilloscope or logic probe and see what happens. Otherwise, you're not going to know because I don't think anybody has dumped the ROM contents that I know of and it seems you've already seen the information already documented.

That's why I said AFTER work. Your company won't let you use their equipment one day after hours if you ask them? Even my crappy company would probably let me stay after when everybody has gone home and use the equipment for a night or two if I asked.

Anyway, I can't offer any more help. I don't deal with CIC chip. It's not necessary for any of the work I do hacking or homebrew.

Thank you ver much!! That is what I was looking for. I knew that there was one thread at Cherryroms about this, but when it closed up, I thought it was lost for good. Thanks for pointing me to NESDev forums, Skeud.