November 11, 2025
Reverse Polish, forward drama
The R47: A new physical RPN calculator released today in 2025
Old-school buttons, new-school brains — fans cheer, wallets scream
TLDR: SwissMicros and the 47calc team dropped the R47, a modern throwback RPN calculator, and fans erupted. Some celebrated and claimed it’s sold out, while others balked at the price, debating nostalgia value versus sanity, with emulator try-outs and stack-size questions fueling the drama.
A brand-new physical RPN calculator just landed in 2025, and the nerds are losing it. The R47, made by SwissMicros with the community-led 47calc crew, is a modern love letter to the legendary HP machines. RPN (Reverse Polish Notation) is that old-school way of doing math where you punch in numbers first, then the operation—beloved by calculator purists. The R47 packs serious power: it solves equations, handles matrices, does calculus, stores tons of variables, programs like a champ, and shows four live stack lines on a crisp screen. It’s wrapped in metal, backed up via USB, and even has a 5-year warranty.
But the vibe in the comments? Pure chaos. One fan cried it’s already sold out, another clutched their pearls at the rumored “250 credits,” saying even 100 would make them question their sanity. The nostalgia squad rolled in waving HP 48Gs, confessing they still prefer RPN and literally remove batteries to protect their museum pieces. Meanwhile, emulator-curious skeptics asked if those “4 stack levels” on screen mean a smaller stack than the “effectively infinite” feel of older HPs, and swapped war stories about dying shift keys. It’s nostalgia vs practical spending, collector hype vs budget reality. A voucher discount from 47calc tried to cool things off, but the thread is split between “shut up and take my money” and “my sanity says no.”
Key Points
- •SwissMicros released the R47, a programmable RPN scientific calculator developed with the C47/R47 team.
- •The R47 runs C47/R47 firmware derived from WP43/WP34S and uses the decNumber library by Mike Cowlishaw for precise decimal arithmetic.
- •Features include advanced math (solve, integration, complex, matrix/vector, base‑n), 34‑digit precision, and up to 1000 named variables.
- •Hardware specs include ARM Cortex‑M33 (up to 160 MHz), 64 Mbit flash, transflective memory LCD (400×240), USB‑C mass storage, and CR2032 power.
- •A 5‑year warranty is provided; software updates/documentation are at 47calc.com, and an introductory discount via vouchers is offered by the C47/R47 team.