Programming Exercise (HP-15C, 15C LE - and others)

[[kby]]

There seems to be dearth of Classics doing the original program…the -55s doing an alternate version. So the -65 does about an hour and 20 min (wasn't watching that closely), using the following fairly brute force code:

LBL
A
EEX
4
STO 8
f
STK (clear stack)
1
gv (Roll-down)
LBL
1
g^ (Roll-up)
CHS
ENT
ENT
gv
gv
RCL 8
./. (div)
+
g
DSZ
GTO
1
RTN

0.693097183