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!)

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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.