Neat, but crashed when I tried to load Frogger

That's one maxed out RAM configuration. Back in my day, we had 4k RAM, about 3500 bytes usable from BASIC, and that was enough, unless you were rich enough to have a 3k memory expansion cartridge. But really, if you need that extra 3k, you're just not writing code efficiently enough, right.

The code and instructions on how to use it are here: https://github.com/lanceewing/jvic