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---
title: Hewlett Packard HP-9810
categories:
- Computers
types:
- Professional Computer
origins:
- U.S.A.
years:
- '1971'
cpus:
- Serial 16-bit
params:
name: HP-9810
image: /media/museum/photos/hp_9810_system_1.jpg
company: /companies/hewlett-packard
company_name: Hewlett Packard
specs:
- label: NAME
value: HP-9810
- label: MANUFACTURER
value: Hewlett Packard
- label: TYPE
value: Professional Computer
- label: ORIGIN
value: U.S.A.
- label: YEAR
value: '1971'
- label: BUILT IN LANGUAGE
value: RPN (Reverse Polish Notation) based
- label: KEYBOARD
value: 75 keys in 3 parts
- label: CPU
value: Serial 16-bit
- label: SPEED
value: Unknown
- label: RAM
value: 51 registers and 500 program steps
- label: ROM
value: Unknown
- label: TEXT MODES
value: 3 lines of 15 numeric chars. Each line displays one register
- label: GRAPHIC MODES
value: None
- label: SIZE / WEIGHT
value: 49,5 (W) x 40,6 (D) x 17,8 (H) cm / 15.4 Kg
- label: I/O PORTS
value: Unknown
- label: POWER SUPPLY
value: Built-in power supply unit
- label: PERIPHERALS
value: RAM and ROM modules, Peripherals I/O connector
- label: PRICE
value: $2475
tabs:
- photos
- adverts
- links
forum_thread: 915
photos:
- title: KEYBOARD
subtitle: ''
text: ''
image: /media/museum/photos/hp_9810_system_2.jpg
adverts:
- title: 1976 ADVERT
subtitle: ''
text: for the 9815, 9835 and 9830 systems
image: null
links:
- title: Complete information about the HP-9810
url: http://www.hpmuseum.org/hp9810.htm
text: ''
- title: HP Museum
url: http://www.hpmuseum.net
text: The best place about old HP computers and calculators.
- title: Joe Rigdon pages
url: http://www.classiccmp.org/hp/9800.htm
text: More information about HP 98xx series
- title: More details and pictures
url: http://www.oldcalculatormuseum.com/hp9810a.html
text: ''
- title: My HP9810 repair job
url: http://www.rheinfeld.de/andreas/9810.htm
text: by Andreas Schumm
related:
- /museum/hewlett-packard-hp-9816
- /museum/hewlett-packard-hp-9825
- /museum/hewlett-packard-hp-9826
- /museum/hewlett-packard-hp-9830
- /museum/hewlett-packard-hp-9836
oc_id: 938
source:
url: https://web.archive.org/web/20230202005940/http://www.old-computers.com/museum/computer.asp?c=938
date: '2023-02-02'
---
The HP-9810 was the successor of the **HP-9100**. Although it kept software compatibility, its internal hardware organisation was completely different. The core memory was replaced with volatile MOS RAM chips and the display used the new technology of 7-segment light emitting diodes (LED) instead of cathode-ray tube.
Arithmetic routines were stored in ROM and user programs in RAM. Several RAM extensions, specialized ROM modules and peripherals (paper tape reader/puncher, line printer, measuring instruments) could be connected to the basic model.
The standard version of this calculator included a **magnetic card reader** located directly behind the two yellow keys at the top-right in the keyboard. While a thermal printer was available as an option, it could only print numeric characters unless you had the Alphanumeric Printer ROM. The add-on ROMs for this machine came in the form of a block that plugged into the left side of the keyboard; each had its own specialized keys. You can see the edges of the ROM block in the picture; the 3x5 array of keys at the leftmost area of the keyboard is its top. It was common to have more than one ROM extension available in a single block, since you could only plug in one at a time.
With this first generation of programmable calculators, engineers eventually became independant from main frames and computer centers. They could write programs, save, recall and print them off-line; and even easily carry the computer from a place to another... it was a true revolution at the time.
<table> <tr> <td></td> <td>We need more info about this computer ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.</td> <td></td> </tr> </table>