Here is another cartridge that goes in the same catagory as BASIC, Assembly Editor, Microsoft BASIC II and ACTION! by OSS. That is this is another programming cart with its own unique language.
I honestly don't do much programming outside of BASIC ( and even that is basic at best) and my knowledge on this cart is minimal. I do know that this cart came with the larger binder manual setups like the Atari 400 came with on release. When I locate one and add it to my collection I will be able to update this page with more info.