unusual HP 41CX - photos & questions


I acquired a bunch of HP 41 calculators at an estate sale. The case of one states that it's an HP 41CX, but the insides are very odd. It doesn't match what I've seen for other 41CX, nor any other 41C types.

It was probably previously owned by an HP developer or extreme hobbyist. Lots of other stuff in the lot, including an IL DEV module and many parts. Does anyone have any idea about this item. I can forward additional photos or additional information about the lot if anyone's interested.

flickr photos of calculator


To me it looks like a standard halfnut HP41CX. What's unusual about it?


Yes i'd like to know what is in the dev module, Thanks



This small pcb is the time and X-Functions module for 41CX. You can add it to another 41CV half-nutt and the time functions will work. With some synthetic code, you will be able to access the X-Functions too, I believe!

Good luck with your new toys!

Possibly Related Threads…
Thread Author Replies Views Last Post
  HP Prime questions: I/O and Meta programming Andy Gryc 2 1,514 10-31-2013, 11:22 PM
Last Post: Andy Gryc
  HP-41 questions x34 4 1,732 09-28-2013, 05:15 PM
Last Post: x34
  HP Prime two questions about function app dg1969 0 867 09-27-2013, 11:14 AM
Last Post: dg1969
  HP Prime Questions Clayton Workman 23 5,911 09-25-2013, 11:19 AM
Last Post: Clayton Workman
  Questions about building a RAM card for hp 48 Waon Shinyoe (China) 0 1,112 07-09-2013, 09:53 PM
Last Post: Waon Shinyoe (China)
  HP-71b questions jerome ibanes 6 2,208 07-01-2013, 05:03 PM
Last Post: Namir
  HP 41 Mcode related Questions Michael Fehlhammer 4 1,987 05-10-2013, 07:09 PM
Last Post: Michael Fehlhammer
  An unusual HP 71B - questions Doug (NYC) 8 2,640 01-16-2013, 08:14 AM
Last Post: Doug (NYC)
  Optimization questions - HP-15C Marcel Samek 49 11,847 11-08-2012, 07:45 AM
Last Post: Luiz C. Vieira (Brazil)
  HP-15C/DM-15CC Memory questions x34 2 1,516 07-24-2012, 06:28 PM
Last Post: Jeroen Van Nieuwenhove

Forum Jump: