I've had the Droid48 app on my android phone for years. It's a little unstable, hope author updates it. But it's so awesome to have a 48GX available whenever, while my real one sits safely on the shelf at home.

When I first got that thing as kid, nearly returned it, RPN seemed so bizarre. So glad I didn't... Really love that language, would never have understood stack based VMs as deeply if it weren't for the things I coded on that calculator.

Droid48 - https://play.google.com/store/apps/details?id=org.ab.x48&hl=...