No, it's all on-chip. There's a big custom chip made by GEC Plessey that has a small flash chip beside it, but it's totally undocumented. They also make the cu

No, it's all on-chip. There's a big custom chip made by GEC Plessey that has a small flash chip beside it, but it's totally undocumented. They also make the custom chips in the door, window switch, and seat outstations. I found some very very general documentation about them but nothing enough to start picking the firmware apart.