HP-65 Program "persists" and steps "disappear"

[Dave Britten]

(01-26-2024 10:59 PM)n1msr Wrote:  Thank you both. I am learning!

The 65 is different from the 67 in several ways. I need to download the User Guide and read.

Mark

Yeah, there are some surprising differences from models that came after (such as tests skipping two steps when false, because GTO is unmerged). Also, I believe RTN has no effect if you haven't started a program/subroutine via A-E. Many of these peculiarities can be exploited to your advantage when writing programs. I would recommend reading through some of the early issues of HP 65 Key Note and PPC Journal if you have access to them, as many interesting tips and tricks are discussed.

EDIT: I forgot to mention that Gene Wright's old web site has some nice games for the 65, as well as an excellent TVM program (actually two programs - one to solve for i% and one to solve for any of the other four variables). These can be good practice for keying in programs, and are worth saving to mag cards.

http://rskey.org/gene/hpgene/index.html