fx-9860gii-2 brief introduction

[Hlib]

In recent years, it has been repeatedly noted that new models of graphing calculators have
too much power consumption at a relatively slow computational speed unlike their classic predecessors from the 1990s.
https://comp.sys.hp48.narkive.com/Zq0obS...onsumption
https://www.hpmuseum.org/forum/thread-4856.html )
I purchased the fx-9860gii-2 (OS 2.09) to get to know a typical modern member of the CASIO family. It is equipped with the custom SH-4AL(SH7305) without FPU made for CASIO. The device is supplied with two cables: SB-62 and USB mini type A.

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The Internet noticed the weaknesses of this model: in general it should be at least similar in speed (compared to older fx-9860g with SH-3), but it is not (due to a lot more bloated and badly optimized software). Also in the specification and on the back of the case stated: 0.7 W. All this I decided to check.
As for programming, interface, debugging, editing and mathematical capabilities - it brings together the best of all previous models. Some new features have been added: processing string variables, creating folders with files of different types, spreadsheet mode etc.
The unexpected surprise for me was the power consumption of this calculator (the measurements were carried out at a voltage of 5 V in the battery compartment and averaged over a time interval).
sleep mode (OFF) - I=30 µA
idle (cursor blinking) - I=1.5 mA (P~0.008W)
running program or graphing - I=19 mA (P~0.1W)
data send to/receive from flash 1.5 Mb memory - I=20 mA (P~0.1W)
scrolling text - 4 mA (P~0.02W)
scrolling list/matrix data - 8mA (P~0.04W)
The shut off point is 3.95 V.
Switching the backlight mode changes the perceived color of pixels from black to blue and adds to all measurements 7mA (P~0.04W). Summary: Pmax=0.15W.
The keyboard is made in the style of cheap financial calculators, but it does not cause complaints. These are first impressions of fx-9860gii-2.

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