9100A question

[DavidBuehler]

I thinking to sell a 9100A and wondering if anyone could help me determine what price to ask for it.

The calculator belonged to my late uncle. He worked for a midwestern electric utility, and recommended they buy it in the late 60s, and they gave it to him after it became superseded by other models.

It is in pristine condition, and has its dust cover and manual.

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[toml_12953]

(03-09-2024 01:58 AM)DavidBuehler Wrote:  I thinking to sell a 9100A and wondering if anyone could help me determine what price to ask for it.

The calculator belonged to my late uncle. He worked for a midwestern electric utility, and recommended they buy it in the late 60s, and they gave it to him after it became superseded by other models.

It is in pristine condition, and has its dust cover and manual.

I can't see any of your attachments but on eBay, a 9100A goes for anywhere from $2500.00 USD to $3500.00 or more depending on who's bidding.

[DavidBuehler]

Thank you. I did a search for sold items on eBay, but it didn't look like any had sold recently. I'm not sure what became of the photos I tried as an attachment; maybe the attachment system is broken?

I put the photos here:

https://rigelluna.weebly.com/hp9100a.html

[Sylvain Cote]

Wow! ... it's in the NOS category.

[Valentin Albillo]

.
Hi,

Truly, truly awesome computing calculator (i.e. programmable). And so early (1969) !!

A real gem.

V.

[Jurgen Keller]

Really well preserved, have not seen such a nice one before. I'm interested but most probably cannot afford it. Anyway, you always need something to dream of :-)

Jürgen
https://hp9100.info

[DavidBuehler]

Thanks for the appreciative comments!

I was impressed it just worked after sitting in a box for decades. By comparison, I have an Commodore PET computer of a slightly more recent vintage and many of the keys don't work, presumably due to oxidation of the contacts.

I'm also impressed that the 9100A is designed with so few transistors. And that the CRT appears to be operating in vector mode. Does anyone know if a circuit diagram exists for the circuitry that generates the X-Y input to steer the electron beam?

[teenix]

Tony Duell did circuit drawings of the 9100B. The CRT section may be the same.

https://www.hpcc.org/cdroms/schematics5.0/index.html

cheers

Tony

[John Garza (3665)]

Very clean! Even the little stack light bulb works.

Cosmetics will definitely up the price.
But what about operation? Have you run the diagnostics?
Has the card reader been refurbished?

-J

[DavidBuehler]

teenix, thank you.

John, I have not run diagnostics, I will look into that. And I'm sure no refurbishment has been done on the card reader, it has been in storage for a long time.