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6,654 pages: 1,289 machines, 702 software, 460 companies, 64 history, 17 articles, 59 fun.
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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-75c-75d.md

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+---
+title: Hewlett Packard HP-75C / 75D
+categories:
+- Computers
+types:
+- Pocket
+origins:
+- U.S.A.
+years:
+- '1982'
+cpus:
+- 8 bits
+params:
+  name: HP-75C / 75D
+  company: /companies/hewlett-packard
+  company_name: Hewlett Packard
+  specs:
+  - label: NAME
+    value: HP-75C / 75D
+  - label: MANUFACTURER
+    value: Hewlett Packard
+  - label: TYPE
+    value: Pocket
+  - label: ORIGIN
+    value: U.S.A.
+  - label: YEAR
+    value: |-
+      75C : September 1982\
+      75D: 1984
+  - label: END OF PRODUCTION
+    value: |-
+      75C : May 1984\
+      75D : 1986
+  - label: BUILT IN LANGUAGE
+    value: Basic interpreter, Visicalc spreadsheet
+  - label: KEYBOARD
+    value: 64 keys. Each key is user-definable
+  - label: CPU
+    value: 8 bits, called Capricorn
+  - label: RAM
+    value: 16 KB
+  - label: ROM
+    value: 48 KB
+  - label: TEXT MODES
+    value: LCD display. 1 line x 32 chars.
+  - label: GRAPHIC MODES
+    value: 160 x 9 pixels
+  - label: COLORS
+    value: Monochrome
+  - label: SOUND
+    value: Beeper
+  - label: SIZE / WEIGHT
+    value: 25.4 x 12.7 x 3.2 cm. - Weight 737g.
+  - label: I/O PORTS
+    value: HP-IL, 3 x ROM/RAM expansion ports
+  - label: BUILT IN MEDIA
+    value: Memory cards, 1.3 KB
+  - label: OS
+    value: Specific
+  - label: POWER SUPPLY
+    value: Battery pack or external AC adaptor
+  - label: PRICE
+    value: '75C: $995 - 75D: $1095'
+  tabs:
+  - adverts
+  - links
+  adverts:
+  - title: FIRST AD
+    subtitle: ''
+    text: February 1983 - The real-size system picture occupied almost the full right page.
+    image: null
+  links:
+  - title: Reverse-Engineering the HP-75C
+    url: http://www.fortitudine.com/~coryc/html/hp75c.shtml
+    text: Very informative page with useful & practical info such as keys functions, Basic commands and HP-IL operations
+  - title: The Museum of HP calculators
+    url: http://www.hpmuseum.org/hp75.htm
+    text: This site has a nice and complete page about the HP-75C/D. You can even order the original manual.
+  comments:
+  - author: Otto (Brazil)
+    date: Monday 14th February 2011
+    text: I has one (serial $ 78). There was 2 lines on screen.
+  - author: Rodolfo Gil (Venezuela)
+    date: Friday 11th March 2005
+    text: Hi!. I´m found a HP75C in a trash can!. I´m want to bring it to life again. Do someboy have got an electronic version of its manual?. I will apreciate very much!. rodolfo.gil@uny.edu.ve / rufogil@hotmail.com
+  oc_id: 640
+  source:
+    url: https://web.archive.org/web/20230607231723/http://www.old-computers.com/museum/computer.asp?c=640
+    date: '2023-06-07'
+---
+
+The **HP-75C** was the first pocket computer ever produced by HP who wanted a pocket book format (10”x 5”) computer as powerful as a desktop. It can also be considered as the first organizer able to deal with a multiple alarms time schedule, to control real time peripherals and to memorize text files.
+
+Its 48KB ROM contained a very complete Basic language and a light version of the spreadsheet Visicalc. Three slots allowed adding pre-programmed ROM modules (Maths, finance, word processor…)
+
+It integrated a card reader. The cards was manually slipped front of the magnetic head. Each card could stock 1.3 KB of information on 2 tracks (650 bytes each). The card information coding allowed great variations of the reading speed, due to manual handling.
+
+The HP-IL (Interface Loop) interface allowed connecting as far as 30 peripherals simultaneously on the HP-75C. Amid the peripherals, one could find a display unit, printers, a modem, a tape recorder and all the HP-IL standard peripherals.\
+As always with HP, the manuals were very complete and pedagogical.
+
+The **HP-75D** was released two years later. It added a wand and wand port. When used with the Bar Code ROM, the computer could scan CODE11, CODE39, UPC, and EAN codes. This made the computer useful for inventory control.