How to find info on part efficiently?
One thing you could try is to attempt an advanced Google search.

I searched for "IAM E3318" with quotes to look for the exact phrase. The third result (this post being the first) was http://www.computerhistory.org/collections/catalog/102711348

Unfortunately it didn't help with a part number, but the manufacturer states Intel Corporation. Exactly how much this can be trusted, I cannot say, but it might give you more information to refine your search.

You could also try and add things like 16 (number of pins) or DIP (if you know the package).

Alternatively you can search for the 'main part' ie a motherboard, or whatever the assembly where you're mystery component is on. You never know, you might find a BOM or schematic. (try searching for that part number but only for PDFs e.g. 'NE555 filetype:pdf')

Hope that helps