The EL-9200C is a recent graphical calculator from Sharp. Of all the graphical calculators I've seen so far, this one appears to have the best, most readable LCD screen. Unfortunately, its programming model is similar to that of comparable models from Casio and Texas Instruments; in other words, the wonderful functional integration that was achieved by Hewlett-Packard in their HP-48 series machines is not present here. The EL-9200C also appears to be a fairly slow machine; there's a noticeable pause after every keystroke as you enter data. Program execution, however, is comparatively fast.

Of course it was yet another implementation of the Gamma function that I used to familiarize myself with the capabilities of this machine. One oddity: regardless of the amount of memory available, the length of each individual line of program code is limited to 160 characters. Because of this, some lengthy formulae, including the one I am using here, need to be broken up into parts.

Input x
y=1
Label 1
If x>0Goto 2
y=x*y
x=x+1
Goto 1
Label 2
g=1+(76.18009172+9.5E-9)/(x+1)-86.50532033/(x+2)+
 24.01409824/(x+3)-1.231739572/(x+4)+
 1.208650973E-3/(x+5)-5.395239384E-6/(x+6)
e^(ln (g*G√(2π)/x)+(x+.5)*ln (x+5.5)-x-5.5)/y