Yeah, they must have set the high bit for the internal products: the TI calculators have die IDs 81, 82 and 83, and the games are 00 and 01. But the TI30 came out something like 3 years before the games.

Speaking of calculation loops, I had forgotten how slow the TI30 is- it can take a couple of seconds to do sin/cos/tan, depending on the argument. At least they did a cool segment twirl on the rightmost digit to show it's thinking.