beginner-how to ID chips?

[greg kring]

Just learning about chip programming. Got all the hardware, all the
software, just need the knowledge. Trying to just play around by copying
files from one chip to another. How do I identify a EPROM to use the
correct programming algorythms? So far I am playing with used OEM
general motors stuff from the 1227748 ECM. All the chips are marked
Delco along with bunch of numbers. Where do I go from here?
greg