Commodore 202 and 207

From: Marko =?ISO-8859-1?Q?M=E4kel=E4?= (
Date: 2002-09-30 12:28:59

On Mon, Sep 30, 2002 at 11:01:11AM +0200, wrote:
> Message-ID: <>
> Date: Mon, 30 Sep 2002 10:13:57 +1000
> From: Matt Boland <>
> Organization: Odyx Corporation Pty Ltd
> References: <>

(This message was bounced due to unrecognized From: address.)

> > Most calculators run at a 9-volt battery, which is no problem.  Two of
> > them (the Commodore 202 and 207 adding machines) are mechanical, driven
> > by a single electric motor.

> If they run off a 9 volt battery, couldn't you run them off a 9V
> regulated plug pack ? Some of these will handle up to 1 amp, which
> sounds sufficient...

Sorry that I was a bit ambiguous.  The 207 and the 207 run directly off
110 volts.  Ville Muikkula has a 115/230-volt 202, and he has been quite

Yes, I've successfully operated all but four calculators (three that
need 110 volt power, and one for which I don't have a suitable power
connector yet).  Two calculators contained batteries, which had leaked
from the (+) side.  One of them used two AA-sized cells, while the other
used two batteries something like 4/3 times the length of AA, apparently
rated at around 3 volts, or perhaps 2*1.2 volts.  I desoldered these
before applying power from a switching power adapter.

I'm a bit distrurbed by the high-pitch noise I get from some calculators.
Maybe it is a transformer for the tube-based 7-segment display; does anyone

(Is there a reason why the (+) side of all four batteries leaked, or is it
just that the batteries might have been built like a bottle whose cap the
(+) terminal is, and the easiest escape for the interior is the cap?  Has
anyone seen a leak from the (-) side?)


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