Originally Posted by hap
This one is ELECsonic Football? http://www.handheldmuseum.com/Misc/ERSFootball1P.htm
That looks identical except this one says ELECsonic instead of ERS Electronic Readout Systems, Inc.

I didn't even need the microscope to figure out the die in Mattel Basketball 2:
[Linked Image from seanriddle.com]

I guess they added a 2nd metal layer to obscure the ROM array from easy visual dumping.