If you're like me I like to have a physical cartridge made for hacks and homebrews that never get put onto a cart. For the 7800 enthusiasts that can be a bit challenging as custom 7800 boards are not as easily accessible compared to the 2600 and 5200 Pixels Past boards available in the Atari Age Store (when open). Fear not, for most games 32K or less it's pretty easy to hack up an existing 7800 cartridges to take an EPROM. External memory and larger roms are bit tricker, but just require you use specific games to be cannibalized for the task. Anyway, a while ago I documented my efforts to hack several carts. I believe I have posted this document in other places before, but this will make it easier to find in the future.

Creating_7800_EPROM_Cart.pdf

-Jeff