Actually 12c508 is the model number for the pic chip that was used
I programmed my own neo 2.2 and made my own neo keys
I made and installed about 300 of them in my day before the messiah chip came out In fact I still have about 30 chips and 2 programmer that I will probably never use again (unless I can find the irmod hex for the xbox remote

)
The neo key came out before the neo 2 and the neo 1
The neo key is just a multimode chip that only used the scex, power and ground
Yes I am sure about the game enhancer also before the first modchip for the playstation (Actually before that peope could were doing straight swaps with game that had a higher TOC and used springs or toothpicks in the door to keep the lid down. You had to have your timing down though)
If you ever go on any of the PS2 sites you might know me I have an alter ego
PS2 is a hint
