yann64andClaude Opus 5.5
b274874139
1,289 discussions, 9,527 archived comments; pages no longer carry the comments themselves. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ
97 lines
3.4 KiB
Markdown
97 lines
3.4 KiB
Markdown
---
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title: Hewlett Packard HP-75C / 75D
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categories:
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- Computers
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types:
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- Pocket
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origins:
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- U.S.A.
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years:
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- '1982'
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cpus:
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- 8 bits
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params:
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name: HP-75C / 75D
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image: /media/museum/photos/hp_75c_system_1.jpg
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company: /companies/hewlett-packard
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company_name: Hewlett Packard
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specs:
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- label: NAME
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value: HP-75C / 75D
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- label: MANUFACTURER
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value: Hewlett Packard
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- label: TYPE
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value: Pocket
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- label: ORIGIN
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value: U.S.A.
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- label: YEAR
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value: |-
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75C : September 1982\
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75D: 1984
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- label: END OF PRODUCTION
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value: |-
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75C : May 1984\
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75D : 1986
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- label: BUILT IN LANGUAGE
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value: Basic interpreter, Visicalc spreadsheet
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- label: KEYBOARD
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value: 64 keys. Each key is user-definable
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- label: CPU
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value: 8 bits, called Capricorn
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- label: RAM
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value: 16 KB
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- label: ROM
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value: 48 KB
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- label: TEXT MODES
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value: LCD display. 1 line x 32 chars.
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- label: GRAPHIC MODES
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value: 160 x 9 pixels
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- label: COLORS
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value: Monochrome
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- label: SOUND
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value: Beeper
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- label: SIZE / WEIGHT
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value: 25.4 x 12.7 x 3.2 cm. - Weight 737g.
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- label: I/O PORTS
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value: HP-IL, 3 x ROM/RAM expansion ports
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- label: BUILT IN MEDIA
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value: Memory cards, 1.3 KB
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- label: OS
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value: Specific
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- label: POWER SUPPLY
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value: Battery pack or external AC adaptor
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- label: PRICE
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value: '75C: $995 - 75D: $1095'
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tabs:
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- adverts
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- links
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forum_thread: 626
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adverts:
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- title: FIRST AD
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subtitle: ''
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text: February 1983 - The real-size system picture occupied almost the full right page.
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image: /media/museum/pubs/hp_75c_pub_1.jpg
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links:
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- title: Reverse-Engineering the HP-75C
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url: http://www.fortitudine.com/~coryc/html/hp75c.shtml
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text: Very informative page with useful & practical info such as keys functions, Basic commands and HP-IL operations
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- title: The Museum of HP calculators
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url: http://www.hpmuseum.org/hp75.htm
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text: This site has a nice and complete page about the HP-75C/D. You can even order the original manual.
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oc_id: 640
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source:
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url: https://web.archive.org/web/20230607231723/http://www.old-computers.com/museum/computer.asp?c=640
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date: '2023-06-07'
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---
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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.
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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…)
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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.
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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.\
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As always with HP, the manuals were very complete and pedagogical.
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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.
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