melting through 2901s?

I've got a couple of Tempest aux boards that have AMD 2901s that seem to
have been melted through to the chip center. There is a Battlezone aux
board on eBay right now that shows the same characteristics.

http://cgi.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=556670453

Is there any reason for this?

tom
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Received on Wed Feb 7 17:17:38 2001