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The Hewlett Packard 85 Computer

Manufacturer Hewlett Packard
Model Model 85
Date Announced 1979
Date Canceled 1984
Number Produced Unknown
Country of Origin USA
Price $3,200+
Current Value $25-$200
Processor HP Custom 8-bit
Speed Unknown
RAM 8K-64K
ROM Up to 32K
Storage Built-in DC100 Tape Drive, optional external 5.25" disk drives
Expansion Expansion cartridge slots added various functionality, interface or storage.
Bus HP Proprietary
Video 256x192 built-in B/W monitor
I/O Optionally: Parallel, Serial, HP-IB
OS Options N/A
Notes The HP 85 is often categorized as a calculator rather then a computer but with built-in BASIC, mass storage and a reasonable amount of RAM, it is a full-fledged computer.
Related Items in Collection Manuals, tons of tapes, custom carrying case (plywood)
Related Items Wanted A new capstain or some way of repairing mine.

The HP-85 was a logical extension of the HP Calculator line that added a bigger screen and more storage to stronger calculating ability.

By including BASIC with the machine they also added programmability. With the addition of "option drawers" the machine was as expandable as any other on the market.

The Hewlett Packard 85 in it's custom-built box

The HP-85 in my collection came to me in a custom built box that easily outweighs the machine, but protects it well.

The open Hewlett Packard 85 case

The case has two sections. The upper opening gives access to storage for tapes, documentation and spare paper

Hewlett Packard 85 documentation

There is a lot of documentation. This is only a small part of it.

The Hewlett Packard 85 covered in an HP dustcover

Inside of its lower compartment the Hewlett Packard 85 is covered with a nice HP cover.

(Submitted July 9, 2012 02:35:35 by Jerry)

looking for HP-85 manuals, accessory, parts, etc. Preferably from Europe.

(Submitted March 6, 2012 23:58:21 by Jerry)

Saw the actual HP 98200A DATA Tape Cartridges on ebay yesterday, for those of you that are looking.

(Submitted February 23, 2012 15:22:29 by John)

I have an HP-85 with case, spare paper, etc. Anyone interested please e-mail me.

(Submitted December 18, 2011 19:39:44 by Tim Walsh)

The easiest way to repair the capstan / gummy wheel is to use 3/8 OD surgical tubing. In the US it can be found at Home Depot. Gain access to the capstan (procedure can be found online)clean the gummy stuff off of the wheel. Cut 1/4 inch of tubing, turn it inside out (inside has more grip)and stretch over the capstan. heat shrink tubing, no tape, no trying to make it uniform. It works like a charm.

(Submitted September 20, 2010 06:43:29 by Christofer)


I have just acquired a HP-85 I am currently working on repairing the the tape drive gummy- wheel. I was wondering if anyone had any old Tapes laying around, I would like to get hold of some extra tapes. At this time I only have one with some software on it but I don't know if works yet.

(Submitted January 19, 2010 18:06:30 by

I have one HP85 that used to be working. Please email me if you are interested in it!

(Submitted December 14, 2009 12:54:38 by pond)

I am looking for a hp85! please write me! i need it for my buisness!

(Submitted September 30, 2009 03:45:07 by Lee Charman)

I would be interested in buying full HP-85s or any spares. I am in need of DC 100 tape drivres for this model.

(Submitted July 30, 2009 09:05:58 by Matt)

I have one of these units in excellent condition that I am willing to sell. It has the case, cassettes, printer paper, manuals and a box full of interface cables. Write me if your interested.

(Submitted April 5, 2009 05:53:16 by Zane)

I am in need of one of these machines for my collection, please email me with anything you have!

(Submitted December 21, 2008 14:23:38 by Rik Bos)

The HP-85 also can use 3,5 inch disk drives witch support the amigo protocol, the HP9121S or 9121D.

(Submitted November 20, 2008 12:14:07 by Rafael Aguilera)

We are desperately looking for a computer hp85, please advise, need it for a equipment in production

(Submitted September 21, 2008 05:52:00 by Execcritaly)

i sell a perfect HP-85,with tapes, manual, programs. Contact me for more information. The items is placed in italy, i can sell worldwide.

(Submitted June 24, 2008 23:03:56 by Rob)

I've never seen an HP-85 closeup, but I used an HP-87 back in the late 1980's when studying EE at a university. Loved doing electronic lab graphs on it. Fun times. I think I still have the manual (looks similar to those HP-85 manuals in your photos).

(Submitted March 7, 2008 09:59:57 by Gerhard Kreuzer)

I need some key caps, have anybody this spare parts or did anybody know a source for it. Thanks a lot


(Submitted November 10, 2007 22:02:07 by CARLOS AGUIRRE)

i would like to purchase one?

(Submitted August 6, 2007 11:23:45 by Penny)

I am looking for 85 h.p. land survey software 38042 H. thanks

(Submitted May 4, 2007 20:54:18 by Jack)

I would like to buy any of the tapes you can spare or any ROM packs that are available.

(Submitted April 26, 2007 20:07:58 by Wayne)

I have just aquired a huge collection of HP-85 machines and rom pacs, software, hardware and manuals of all types. I have not even begun to sort through it all yet. If you have a specific item you need please contact me at the above email address. I have software on 5.25 disc, disc pacs, new tape cartridges never opened and a bunch of other stuff I will be sorting through in the next weeks including cables and interfaces.

(Submitted January 31, 2007 04:48:15 by Mamoun A.R)

Hello, I'm looking for an HP 85 QIC Drive, would be interrested in buying either a drive or the whole HP85 computer. please call me at 727-532-6381 or e-mail me if you have a source. Kind regards.

(Submitted October 14, 2006 16:16:12 by Lucia)

I have this.He is in excellent condition. It is working, it has manuals, boxes and original custody. If there is someone interested in buying it, I accept proposals. Please contact me to buy it.

(Submitted January 24, 2006 00:20:38 by ChameleoN)

I have this. Do you want spare parts? Shipment at own expense from Russia

(Submitted December 19, 2005 11:04:24 by Sunny Pathak)

My name is sunny and I am after some spare parts viz CPU, I/O RAM and video ROM for HP-85. If you could supply the parts or provide a contact who could do so, the effort would be appreciated.

(Submitted December 8, 2004 08:54:02 by Xenman)

These were called calculators as a sales/marketing ploy. Buyers were having trouble getting purchases for computers approved. However, companies more easily allowed for the purchases of 'calculators'.We actually still use am HP-85 to run a piece of equipment at our facility. Very reliable after 24+ years of service.

(Submitted October 19, 2004 03:30:23 by Max BrainBox)

The HP-85s processor ran (runs?) at 634KHz.

(Submitted July 30, 2004 09:34:58 by Ron Mock)

Tapes for the HP-85B, DC100 tapes.

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