Thanks again for the replies. Good info.
Only thing I'm still confused about is the non modchips, the "only code" ones like YAOSM. You say chips for them are very cheap and easy to come by. I'm not exactly sure what you're talking about. What do these 'chips' look like? I guess you just somehow attach the YAOSM to this chip without soldering? Kinda confusing. Thanks.
You download the YAOSM code and use a programmer to put it on a PIC chip. That's a standard chip that can be used for many purposes, and in this case it can be used as a mod chip. It looks like this:
Those chips are very cheap, and if you have a business or university email adress, there's even a company that will send you some chips for free.
You can build the required programmer yourself (it only requires some cheap parts, but you do need some skills for it), or get one from ebay for example (search for JDM programmer).






