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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ

content/museum/hewlett-packard-hp-9810.md

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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
+  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
+  photos:
+  - title: KEYBOARD
+    subtitle: ''
+    text: ''
+    image: null
+  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
+  comments:
+  - author: bb
+    date: Saturday 5th March 2016
+    text: Our school had one of those in 1979 (including a A4-flatbed-plotter), but everyone wanted to use the newer PET 2001 and CBM 3002 systems. so I had that machine pretty much for myself.
+  - author: Achim Alexandru (Romania)
+    date: Tuesday 4th November 2003
+    text: I have in my lab one of the Hp 9845b i believe without monitors.If want to get picture of the machine tell me.
+  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>