+ and - on HP21 calculator?

From: Russ Blakeman <rhblake_at_bigfoot.com>
Date: Sat May 5 20:22:42 2001

In reverse shouldn't hurt it, just as if you put AA cells in a radio and
they were backwards. Transistorized equipment is polarized to work so my
guess is that it wouldn't hurt it. Charging them backwards might though.

> -----Original Message-----
> From: owner-classiccmp_at_classiccmp.org
> [mailto:owner-classiccmp_at_classiccmp.org]On Behalf Of Chuck McManis
> Sent: Saturday, May 05, 2001 7:45 PM
> To: classiccmp_at_classiccmp.org
> Subject: + and - on HP21 calculator?
>
>
> Hi, I've got an HP-21 that is missing the battery pack. Does anyone know
> which pin is plus and which minus when you look at the calculator
> from the
> back, with the AC adapter plug facing up? I can probably synthesize a
> battery pack with a couple of AA NiCd cells but wouldn't want to
> hook it up
> backwards.
>
> There are two contacts at the "back" of the battery box for the cells and
> it would be useful to know this info ...
>
> --Chuck
>
Received on Sat May 05 2001 - 20:22:42 BST