[EricH]

Any RC from 2004 or before most likely will need some serious work to make work with EasyC (or C, for that matter).

Allow me to present a history of IFI robot controllers and the languages they used, assuming that my memory is correct:

2003: PBASIC
2004: C
2005: C
2006: C, more memory than 2005. Not sure about EasyC capability.
2007: C, EasyC
2008: C, EasyC

You want a 2007/2008 model, and 2006 might be acceptable. I'm pretty sure that anything before 2005 won't work right with EasyC.

However: You are asking for the OI. As I recall, programming that isn't an issue. I'm not even sure it takes programming! So anything from 2005 or later *should* work. Pre-2005, probably not.

Also note that IFI sells the control system components still. They are kind of pricey... over $700 for just an OI and 2 modems...