The Museum of HP Calculators (http://www.hpmuseum.org
) has information
about both of these, and there have been discussions about repairs on the
forum there. The card reader is probably magnetic, but there appears to
have been an optical card reader available as an option, too.
Great find, anyway :-)
On Wed, May 16, 2012 at 12:58 PM, Chris Pye <pye at mactec.com.au> wrote:
I was dropping off some rubbish today at the local
council dump, and
noticed an old HP machine in the trailer next to me. I didn't even say
anything, I just stopped and stared at it and the guy asked if I wanted it.
When I said yeah, he replied with "shame you weren't a few minutes
earlier, I just chucked two others in the recycling bin and all the manuals
and tapes/cards are in the pit."
Turned out to be an HP 9820A, and I managed to get the other 9820A and a
9810A out of the recycling bin without anyone noticing. Unfortunately
couldn't retrieve anything else.
Just wondering if there is anything in particular to watch out for when
powering up one of these for the first time other than normal power supply
I (obviously) don't know much about these machines at all, but I'm
particularly mystified about how the built in card reader worked (is it
magnetic?).. Could it be written to as well?