chip and ecm identification

[buickpower]

hey guys i just removed my ecm and chip and cant identify them. The ecm has a large sticker that says it is remanufactured original equipment, has some numbers on it and the O.E. number is 1226459. Is that the stock 1984 ecm or the newer 86-87 style? Also, i cant figure out what the chip is exactly, the plastic prom carrier has the letters RN on it, but the chip itself has an orange sticker on the top, and says Kenne Bell part no.9004u. Any ideas as to what type of chip this is and what octane gas it was intended for? Any help would be greatly appreciated.