5 May
2001
5 May
'01
1:22 p.m.
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(a)classiccmp.org
[mailto:owner-classiccmp@classiccmp.org]On Behalf Of Chuck McManis
Sent: Saturday, May 05, 2001 7:45 PM
To: classiccmp(a)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