HP 35s checksum repeatability observed



#2

I have had the opportunity to work with a few 35s models in recent months.
The well documented checksum problem with the 35s is a great disappointment, but I have seen some repeatability when programming multiple 35s calculators.
I have 2 calculators (SNs: CNA 8380xxxx and CNA 8310xxxx) that show the SAME checksums for a set of programs I entered in.

Here's what I know so far:

-The calculators were brand new and have never been programmed before I programmed them.

-No variables (direct, indirect, statistics) were stored before I programmed them.

-I took care to enter the programs in correctly, but was still able to delete lines and variables and still get repeatability.

-I never ran the programs while programming.

-I didn't switch between RPN and ALG modes while programming.


Has anyone else seen this before?
I'm no expert, but I think the checksum problem is rooted somewhere in the indirect addressing.


Possibly Related Threads…
Thread Author Replies Views Last Post
  HP-28C ROM checksum addresses? Christoph Giesselink 0 799 07-25-2010, 08:25 PM
Last Post: Christoph Giesselink
  More about Checksum Miguel Toro 8 2,332 08-19-2007, 07:27 PM
Last Post: Vincze
  35s checksum problem Lyuka 42 9,055 08-14-2007, 07:54 AM
Last Post: Jeff O.
  HP-41 program checksum Jean-Marc 2 1,008 04-21-2006, 04:44 PM
Last Post: JeanMarc
  33s CHECKSUM issue: old/new ECL 11 3,114 10-30-2005, 10:43 PM
Last Post: James M. Prange (Michigan)
  HP41 ROM Checksum Meindert Kuipers 4 1,375 10-25-2004, 02:30 PM
Last Post: Meindert Kuipers
  HP-41 Bar-Code checksum algorithm. Diego Diaz 3 1,225 11-29-2002, 05:19 AM
Last Post: Diego Diaz
  HP18C & HP28C ROM checksum? Christoph Giesselink 0 695 11-03-2002, 06:11 PM
Last Post: Christoph Giesselink

Forum Jump: