newRPL: Now for 39GS and 40GS! [June 29-2017]

[Claudio L.]

(06-29-2017 09:14 PM)matthiaspaul Wrote:  Do you still target the 39g+ as well?

Besides the larger flash of the 40gs, the only other hardware differences I am aware of are that the 39g+ supports IrDA, the 39gs supports IrDA and 4-pin serial and the 40gs supports only 4-pin serial. Also, the 39g+ is powered by three AAA batteries only, whereas the other two calculators are powered by four AAA batteries, which might require minor adjustments in power management.

Greetings,

Matthias

The 39G+ is supported as well (sorry, I forgot to mention that one). Its hardware is similar to the 49g+, while the 39/40GS have the hardware improvements of the 50g.
I wonder if the 39G+ has the same power drain issues with newRPL as the 49G+, since it's basically the same hardware. Anyone out there can please test the power drain?

Regarding speed vs size: I was aiming for both! On the PC the new algorithms are 3 times faster than the old ones at 32 digits, but when I finally tested on real hardware it was very disappointing to find gains that were much less. I think it's because the PC can multiply in one cycle, while the small ARM chips take a few cycles per multiplication, but they always add in 1 cycle (so it favors CORDIC). Can't always get what you want, but still the Savage benchmark went from 31 seconds to 20.5 seconds at the default 32 digits.