Mark- it looks just like the die on the Funtronics Jacks PCB. I'll post some pics soon. The game is pretty simple, so they may have just tested its functionality, instead of verifying the ROM contents.
OG- I'll post a much better die shot of Top Gun minus the top metal layer.
Hap- I just noticed that I don't have any pinouts for the TMS1600 - and where did we get the pinouts for the TMS1400? Did we just figure them out by PCB wiring and code? Was there info in a patent?
I did a quick compare of that pachinko PCB to the 2 Entex card games but I'm unable to give you an answer yet. I see some similarities to the 1670 and some to the 1370, but I also see differences.