PPC Journal V2N6 - TVM i% unknown on HP-65

[AndiGer]

Found an interesting program on Gene Wright's homepage on solving TVM with I% unknown to run on a 65.
http://www.rskey.org/gene/calcgene/ann65i.htm

Unfortunately the program does not do what is promised.
The description is incorrect in the meaning that it will not show 0,00 after entering N, PMT, PV, FV but just the entered value (I% known does). Statement 63 will give key code 33 (STO not RCL).

And another thing: If I press B the programm never terminates. Guess it should be the first statement so that RTN stops the calculation.

Anbody out there who still owns PPC Journal V2N6 p. 14 and 15 or a copy of it and can give the answer where is the problem in the given code?

Thanx
Andi