I decided to open up some other carts that I have as doubles and see what is inside. I found some interesting things. For example, I was a little surprised to see an EPROM IC instead of a ROM IC on My Hero. Also, it was of course quite pleasant to find a 315-5208 paging chip on the Global Defense PCB. This paging chip and board can be reused to make a 1Megabit EPROM cartridge.
Running Battle: 32 pin ROM IC #832011-25
My Hero: 28 pin EPROM IC #AT27C256
Global Defense: 28 pin ROM IC #8838D & 28 pin paging IC #315-5208