fx-9860gii-2 brief introduction

[Mjim]

(12-06-2019 04:49 AM)Steve Simpkin Wrote:  Very cool. I never used mine outside so I didn't notice this.

If you haven't already done so, check out KhiCAS. It is a port of Bernard Parisse'S Giac/Xcas computer algebra system (CAS) for the Casio CG50 or Graph90+e (as mentioned by Hlib above). It provides algebra, calculus, solvers, linear algebra, graphs, ... commands for the CG50.
https://www.cemetech.net/forum/viewtopic...88&start=0

That was actually one of the biggest selling points for me

I'm pretty abysmal at using it though. I'm going through Calculus 2 (self-study), so I've been relying on Microsoft Mathematics for checking some of my integral/differential calculus answers, but it can't really cope with Calculus 2 integrals, so I found XCAS (which I'm also hopeless at using), which led me to discover KhiCAS.

I think as well some benchmarks should be added for the fx-CG50. Once again the default NQUEEN test (not the optimized one):

fx-CG50 default clock (Ptune3 "NORMAL"), v03.30.0202



Built in Basic:
27 Seconds
27 Seconds / USB connected

C.Basic CG v1.39beta:
0.52 seconds / DBL Mode
0.31 seconds / INT Mode

Probably relatively good news for Prizm CG10/20 owners is that the slower memory timings on the fx-CG50 means the clock rate being doubled doesn't translate into double the speed. In fact with some memory tweaks you can get the same performance at half the clock rate (Ptune2 memory wait tuning).

Also decided to do some power current draw tests:

Casio fx-CG50 Backlight current draw (Mode 1, idle), average value is after a minute approximately:

Backlight 0/5 (screen time-out brightness):
min: 2.129 mA
max: 7.037 mA
avg: 2.62 mA

Backlight 1/5:
min: 3.016 mA
max: 7.932 mA
avg: 3.50 mA

Backlight 2/5:
min: 4.012 mA
max: 8.942 mA
avg: 4.50 mA

Backlight 3/5:
min: 5.435 mA
max: 10.386 mA
avg: 5.92 mA

Backlight 4/5:
min: 7.275 mA
max: 12.225 mA
avg: 7.76 mA

Backlight 5/5:
min: 9.552 mA
max: 14.565 mA
avg: 10.07 mA

Casio fx-CG50 Backlight current draw (Mode 1, scrolling up and down through history):

Backlight 1/5:
~34mA

Backlight 5/5:
~41mA

Casio fx-CG50 Backlight current draw (C.Casio Basic summation), average is after a minute.

Backlight 1/5:
min: 38.449 mA
max: 38.781 mA
avg: 38.67 mA

Backlight 5/5:
min: 45.735 mA
max: 46.099 mA
avg: 45.98 mA

The backlight power consumption seems about the same as the fx-CG10/20/9860G2 which is around 7 mA. The power consumption overall is slightly higher than the fx-CG10/20 at stock speeds (~39mA vs ~34mA on ftune's website), and much hungrier than the fx-9860G2 (22mA). To be fair though it is faster at it's stock speeds, so less time processing can translate to an overall decrease in power consumption (more time in idle).

Sleep mode current draw:
After 30 minutes:
min: 0.682 mA
max: 2.764 mA
avg: 0.959 mA

I'm betting that this is because the SDRAM is still being refreshed at this point.

Sure enough, after 1 hour it goes in to low current standby:

After 1 hour:
min: 35.11 uA
max: 35.81 uA
avg: 35.5 uA

I did the voltages last, but I'm not as thorough here:

Casio fx-CG50 Backlight voltage (Mode 1, idle), average value is after a minute approximately:

Backlight 1/5:
min: 5.2952 V
max: 5.3047 V
avg: 5.3037 V

Backlight 5/5:
min: 5.2844 V
max: 5.2947 V
avg: 5.2931 V

Casio fx-CG50 Backlight voltage (C.Casio Basic summation), average is after a minute.

Backlight 5/5:
min: 5.2202 V
max: 5.2296 V
avg: 5.2231 V
*Note, you can see the voltage dropping through the discharge of the batteries with this test, so the results were decreasing over time.


Sleep mode voltage:
min: 5.2907 V
max: 5.2953 V
avg: 5.2946 V

This probably wasn't all that great a measurement since I did it straight after the high current draw test. After 7 or so minutes:
min: 5.2956 V
max: 5.2998 V
avg: 5.2992 V

So maximum measured power consumption (C.Basic summation test, maximum brightness) is:
5.2296V * 46.099mA = 0.24W

Still a lot better than the 0.6W quoted on the back; definitely more than the fx-9860G2 though which states 0.7W on the back.

EDIT:
C.Basic seems to have 1.7MB of additional RAM for use on the fx-CG50, so I was able to build a table with nearly 100,000 values.