Re: Exploding chips - not fun
I had a similar experience with a home brew EPROM burner; The first clue that the circuit I had built was faulty was the silicon under the little window in the package was do a rather good impersonation of an LED.
The thing that surprised be was the damned thing worked after... Erase, re-program to whole 9 yards.
Never trusted it enough to use in an actual machine; but kept it around as a scratch EPROM and good luck charm :)