help with broken GS

[Jon Christopher Co <jon@tridel.net>]

I was using my GS and smoke started coming out from the inside.  after
opening it up my best guess tells me the smoke came from an 8 legged
chip right under the power supply at the upper leftmost corner (right
behind the composite video connector and ADB jack).  Right now the
computer still boots up, but will not respond to any ADB device
(keyboard).  can anybody identify what this chip is?  i also noticed
there is a slight bump in the middle.. is this normal or is it supposed
to be perfectly flat?