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)
*edit*
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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.