What mfg are GM eproms?

[greg kring]

Asked this question about how to identigy chips a few days ago. I'll try
again with a more specific question. Trying to reprogram eproms from a
GM 1227748 (sequential turbo MAF) ECM. I need to know the manufacturer
of the chip to set up the device type in my EMP10 programmer. What is
it? The programmer doesn't tell my as far as I know. Apparently I'm
supposed to know? Sorry, I'm in over my head. The chips are only marked
"Delco" along with a bunch of part numbers that mean nothing to me. I
can't even get one to read correctly without knowing that info. Any body
want to help out a newbie?
greg