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12C Classic Simulator for iPhone version 2.0 released



#6

This may be of interest to some here.

The price remains only 10 bucks and it seems the annoying touch interface bugs have finally been fully resolved.

Also, it seems that RLM is giving out free keycodes for the desktop version of the simulator (Mac and PC) for buyers--you simply send them your iTunes invoice email, they send you a serial.

Now that the touch interface has been fixed I can see myself using this a lot.

Les


#7

It's a fine product, but it appears to use native binary IEEE floating point, rather than BCD. It definitely doesn't seem to use the same financial algorithms as the real 12C. Trying to work Kahan's example, "60 ENTER 60 * 24 * 365 * n 10 RCL n / i 0 PV 0.01 CHS PMT FV" gets a result fairly close to that of the real 12C, but then pressing "i" to back calculate the interest rate as a check returns 100.8, rather than the correct answer near 0.0000003171.

It also doesn't implement the program instruction with the keycodes "45, 43 31", which FIN-12C does. Of course, most people never use that or even know that it exists.

FIN-12C costs twice as much, but uses BCD arithmetic with the same algorithms as the real 12C, so it will produce numerically identical results.

Edited: 29 Oct 2008, 9:20 p.m. after one or more responses were posted


#8

Quote:
It also doesn't implement the program instruction with the keycodes "45, 43 31", which FIN-12C does. Of course, most people never use that or even know that it exists.

Eric, what exactly does RCL PSE do?


#9

HP called it "RCL g R/S" rather than "RCL PSE". See Luiz's explanation of it in this thread in the archives.
Short summary: it can be used to enter a guess when an IRR calculation gets ERROR 3.


#10

Thanks Eric, I didn't know about that. Interesting thread. I wonder if we'll ever see our friend V again.


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