What is a modern-day HP-16C?

[megarat]

This probably doesn’t count (especially with the “modern” requirement), but I haven’t seen it mentioned yet, so here goes: Jake Schwartz made a great 16c “emulator” (more of a simulator, really” for the HP48. I’m not sure if it’s still obtainable, and it requires an overlay for optimal use, but if you can get an HP 48 kitted up with it, it’s quite keen.

UPDATE: the emulator can sill be obtained here: http://www.pahhc.org/mul8r.htm