ICs like that are fairly common. What you see in the center is the die.
If I remember correctly, ICs can be reset by light (UV I believe) and normally have a sticker over the window to protect whatever has been programed onto the chip.
1) Long boards, at least low telco; I don't think it can go high but if you have a bunch might keep them separate but with your low telco in case they can be upgraded. Square boards, make sure that silver box I can't read isn't mercury (doubtful, but always good to check), if no mercury, high telco.
2) High peripheral sounds right.
3) As is, I'm leaning low peripheral. Without the transformers probably could make high peripheral.
_________________ Here to learn more so I can recycle more My grades are my own opinion and not an official grade from Boardsort
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