Nice! That decap should be useful (sean: hopefully you didn't purchase this specific revision =p) I see they changed the way the TDO opcode works again. And it looks like RSTR opcode is back too. (I can't see RSTR on the instruction decode tho)
this die is definitely based on the tmc0260, but with more ROM, more RAM
0260 and 0270 have same amount of ROM and RAM as 0980.