HP 41C and CV boards with some piggy backing from the factory



#2

Further to my queries below, and thanks for all the help from everyone.

Just to let you know, I do have an orphan CV board which will donate the LCD panel (functioning of course) and the:

1LE7 0001 THROUGH 1LE7 0005

to a "with all bugs, tall keys, contact balls" 1979 HP 41C with a bad D/S. This will give it a CV memory while saving the bugs which is the intent.

Here are five pictures of two C pcas and three CV pcas:

The "with all bugs, tall keys, contact balls" 1979 HP 41C with a bad D/S:

An HP 41C circa 1981:

An HP 41CV circa 1981 no piggy backing:

A 1982 HP 41CV with all six D/S chips piggy backed located at the top:

A 1983 version with two piggy backed D/S chips:

Now I know what piggy backing is (what a neophyte!)

==================================================
==================================================

Here is the project:

remove the yellow highlighted D/S chips on this HP 41C:

remove the yellow highlighted D/S chips on this HP 41CV and install them on the HP 41C board above with one chip piggy backed near the top for case clearance (thanks Eric, Randy and Jim):

If you see any problems with this YELL as I won't be doing it today ;-)

Cheers, Geoff

Edited: 18 Mar 2010, 3:02 p.m.


Possibly Related Threads...
Thread Author Replies Views Last Post
  HP Prime reset to factory state? BruceH 3 1,406 11-26-2013, 07:27 PM
Last Post: BruceH
  HP Prime reset to factory settings bertopl 16 1,649 09-28-2013, 03:53 AM
Last Post: bertopl
  USB flashing/Li-po boards patryk 6 964 09-08-2013, 12:31 PM
Last Post: patryk
  Can my CV take a CL board? Les Wright 5 817 06-03-2012, 08:33 PM
Last Post: Les Wright
  NoV-64: Possible to Burn Time Module for Use on a CV? Les Wright 10 1,132 06-02-2012, 11:40 PM
Last Post: M. Joury
  FOCAL old factory ... Olivier De Smet 22 2,074 11-04-2011, 01:44 AM
Last Post: Israel Otero
  The FOCAL Factory: Lend, Lease Savings Geir Isene 4 682 10-25-2011, 05:20 PM
Last Post: gene wright
  The FOCAL Factory proudly presents 2 new modules Geir Isene 16 1,474 10-24-2011, 04:36 PM
Last Post: Ángel Martin
  Experience (Learning) Curve Program for HP-41C/CV/CX Chris Catotti 1 435 09-20-2011, 01:46 PM
Last Post: Frido Bohn
  Why I like the blank overlay option for the 41C, CV, CX & CL and my 41CL final configuration Geoff Quickfall 1 395 06-18-2011, 03:18 AM
Last Post: Geoff Quickfall

Forum Jump: