17 May
2012
17 May
'12
12:41 p.m.
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
Namens Chris Pye
Verzonden: donderdag 17 mei 2012 11:27
Aan: General Discussion: On-Topic and Off-Topic Posts
Onderwerp: Re: HP 9820A
On 17/05/2012, at 6:17 AM, Tony Duell wrote:
pac.
Both are programmable, but have only a few built-in functions. Are
there any ROM modules in yours (look on top behind the display)? The
maths ROM, for example, adds logs, SIN/COS/TAN, etc. The machines can
work without any extra ROMs, so not having them is not a disaster.
Yes all three machines have math pacs, and the 9810 has a printer alpha The 9820 will have a built-in thermal printer (I
think it's standard
on that model), it's an option on the 9810 (Opt 004 IIRC). It is the
same unit, so if you have no pritner in the 9810 you could move one
from one of the 9820s into it.
The 9810 has the printer option.
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?
YEs, it's magnetic, yes it writes too. It puts 3 data tracks nad oen
timing track on the card, you put one end fo the card in, then turn it
round and put the other end in to get twcie the capacity (in other
words it only uised half the width of the card at a time. It's a pity
you didn't get any cards, those are not easy to find. way of getting to them. At least I managed to save
the 3 machines..
on my
You can get user manauls, the HP service manaul and some unofficial
scheamtics from http://www.hpmuseum.net/
Thanks, got that stuff now.. With that and your info I should hopefully be way.
depth)
OI know a little abotu the insides of the machines.
I think that's an understatement, and thanks for all your great (and in information, I'm sure it's going to be a lot
of help. Initially I think I
will probably
just clean up the 9810 and one 9820 and board swap (if
necessary). I'll
sort out
the rest at a later date. I forgot to mention that I
also salvaged a
spare card
cage with 4 boards in it, it's labeled
"yellow card faulty", so it may be
of some
use.
I had not planned on owning or using a machine like this, but now I have
them
I'm discovering how interesting they are and
I'm keen to learn more and
actually
use one. I think it's the oldest gear I have, the
next being some old CDC
terminals that I've had since I was about 15..
Tony was very helpful when I was repairing my HP 9830A.
It had multiple faults, I had to change a lot of TTL ic's.
You can see some of the 'war pictures' at www.flickr.com/hp-fix
When fixing the platen of the HP 9820 I used precision tubing and not the
shrinking tube.
You can read those fixes at the page on the HP computer museum site
www.hpmuseum.net
If you need some cards to test the reader let me know, I think I can miss on
or two..
I also have most of the TTL (standard an H-TTL) and Bipolar PROMS, used in
the HP 98X0 series, stocked, so if you can get an IC let me know.
-Rik
Please feel free to ask for any information on these great machines
I'm sure I will need more help at some stage.
Chris