Now that the game is playable, I’ve set high scores which are lost after power off. That kind of sucks. Luckily, I found this today.
This guy reprogrammed two 2764 ROMs and upgraded an SRAM chip to achieve high score retention after power off. That’s insane, but I still intend to reap the benefit of his hard work since he offers the binary ROM images free for download.
I could buy them preprogrammed from this place for $45, but frankly I need an excuse to buy an EPROM programmer. One can be had for under $50 thanks to Willem. I don’t think the blank chips will be more than $10 either. The chips are all socketed, so it’s a plug and play swap once I have them programmed. 🙂