I have two HP41C overlays which I cannot determine what they are.
1) Functions on the overlay (top row) include: DCV/ACV, TEM/REF,2W(ohm symbol)/4w(ohm symbol), FRQ/TOT, RED/WRT
2) Functions on the overlay (top row) include: T/E, J/K, S/R, RTD/4WRTD, THM, 4WTHM.
2nd func is f (gold) shift - e.g. f ACV on the top left key of the first overlay.
Anybody know what these two overlays are for?
Thanks.
.....Art