Which calculators run RPL under the hood?

[Dave Britten]

(11-27-2019 03:04 PM)rprosperi Wrote:  I believe ALL Pioneers are based on a SysRPL core, with varying maturity of the kernel as time progressed. It has been reported (I believe after an extensive disassembly) that the 42S used a larger amount of assembler code than other models, but this no doubt is due to being so early and requiring lower-level tweaks to accomplish the required 41 FOCAL compatibility. Creating all models on a common platform was one of the core goals when SysRPL was conceived. It is still cheaper/faster/safer to build a "low-end" model like the 20S on an existing platform than to create a new one, even if that model's demands are not high.

That's interesting that they used it even on the 20S. What's it have, a couple hundred bytes of RAM at most?

The mid-range ones I had suspected didn't use RPL, which could explain the 32S being much faster than the 42S. But if it's also RPL, and the 42S is using a lot more assembly code, then that makes the speed difference more surprising.

(11-27-2019 03:04 PM)rprosperi Wrote:  I believe the later derivatives of the Pioneers (10BII-Gold, 17BII-Silver, 33S, 17BII+, et. al.) were all re-implemented when outsourced to various firms in China. Later still, the 10bII-Silver and 10bII+ were then brought back in-house and done (in C?) by Tim I believe (the 10bII+ for sure).

Yeah, I'd be very surprised if any of those had any RPL left in them.