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Re: Reflashing, Reprogramming, Repairing MODULES !
Posted to Technical Discussion Forum on 7/21/2010

I remember on early 80s GM vehicles there used to be calibration update access hole in the side of the PCM. You could access the PROM (Programmable Read Only Memory) and change it out for a newer version when necessary.

IIRC EPROM (Erasable Programmable Read... Login to read more.