Gigatron Hackers

Sounds a little like Mouse, an early micro language. There was a book on it that I learned the concept of a parser from. Like yours it was rpn and all the instructions were single characters, which made the parser super simple and good for teaching, just a case statement processing a character strea...

I'll admit I've been holding off spending a lot of time with the gigatron until a decent keyboard solution presented itself. Now that that's close, while basic is lovely and period and all, has anyone considered a Forth? It's relatively easy to cobble together, and fast.