|HP 41C and CV boards with some piggy backing from the factory|
Message #1 Posted by Geoff Quickfall on 18 Mar 2010, 1:51 p.m.
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 ;-)
Edited: 18 Mar 2010, 3:02 p.m.