I posted info on Tandy 2-Player Football- http://www.seanriddle.com/pic1650a.html#tandyfb

It's another PIC 1650A.

I built a rig for the SDIP 40 MP2139 from Tandy Cosmic 1000 Fire Away and dumped the lower 7 bits of the ROM. I'll play around some more and see if I can get the high bits; if not, I'll decap it.