Citizen SRP-45 programmable scientific pocket calculator from 1991

[jebem]

(01-03-2017 03:09 AM)Eddie W. Shore Wrote:  This calculator looks similar to the Radio Shack EC-4036 I just bought. Thank you for this thread because now I think I know at the [A ->A] and [B ->B] keys are. Looks like store is the second function and recall is the primary function (outside of stats).

Hi, Eddie, thank you for your comments.

Yes, on my Citizen SRP-45 these keys are constant memories.
If there is a non zero displayed value (register X), then when recalling one of these constant memories it will multiply the displayed value by the constant value.

I have run again the forensic test to extract all the available digits.
9 sin cos tan Inv tan Inv cos Inv sin - 9 * 1000000
and got the combined result of: 9.0000156204, the same as reported for your machine.

I do not have the Radio Shack EC-4036, but based on the forensics result from the site above, it looks like it uses the same Sharp LI3301A processor. So it could present the same features as many other calculator brands using this processor.

(01-03-2017 03:09 AM)Eddie W. Shore Wrote:  I notice that many calculators find it popular to make Statistics mode the second function of the [ON/C], I find that strange. I have a solar scientific calculator (Staples 27952, it has hole punches designed to fit in a three ring binder) with this setup. On the Staples, I can't access the Stat mode when pressing [2ndf] [ON/C], instead the calculator clears.

Just guessing here, but probably all the machines sharing the same Sharp LI3301A processor (assuming the same firmware was burned into it, that is) will have the STAT function mapped to the 2ndF ON key combination, and an extra dedicated key to power off the machine.

Still it is a strange place to invoke functions. The ON key should be used to manage power duties only.

I have others machines like the Citizen SR-35N, the Canon F-400 or the Deli DL-1704, that also uses that STAT / ON combination and a dedicated power off key, despite showing different forensics results. So this key arrangement is not exclusive of the Sharp LI3301A processor.

Our local Staples store do not sell the Staples brand and I have none of their calculators. Your Staples 27952 can have a fault, assuming the calculator advertising is correct.