Are the GM OEM memcal eproms 27128, 27c128s, 27128A, or something else?. This is in reference to the 165 ecm Then on the 730 ecm do they use the 27256, 27c256, or ?. Can they all be programmed at 12.5v, as a rule?. Enquiring minds blah blah blah. TIA again, Bruce