Place the Flicky ROM all the way to the right, meaning towards the capacitor (in my photos)? This would leave 1 and 42 on the PCB open, if that's what you mean.

I'm quite certain the cartridge is clean and I've considered the possibility of the mask ROM having been toast too, although I think it's the most unlikeliest scenario. I can change the capacitor although it doesn't look bad. Thanks for the speedy reply, I appreciate it.