---
title: Texas Instruments TI-55-II
categories:
- Computers
types:
- Pocket
origins:
- U.S.A.
years:
- '1981'
params:
  name: TI-55-II
  image: /media/museum/photos/texas_ti55ii_system_1.jpg
  company: /companies/texas-instruments
  company_name: Texas Instruments
  specs:
  - label: NAME
    value: TI-55-II
  - label: MANUFACTURER
    value: Texas Instruments
  - label: TYPE
    value: Pocket
  - label: ORIGIN
    value: U.S.A.
  - label: YEAR
    value: September 1981
  - label: KEYBOARD
    value: 45 keys
  - label: RAM
    value: 56 steps - 7 memories
  - label: TEXT MODES
    value: 10 digits LCD display
  - label: POWER SUPPLY
    value: Lithium batteries
  - label: PRICE
    value: $50
  tabs:
  - adverts
  forum_thread: 586
  adverts:
  - title: U.S. ADVERT(1982)
    subtitle: ''
    text: The calculator was sold with a very helpful manual (Calculator Decision-Making Sourcebook) giving step- by-step examples for the best techniques used for solving mathematical, statistical and scientific problems, as well as programming tips.
    image: /media/museum/pubs/texas_ti55ii_pub_1.jpg
  oc_id: 597
  source:
    url: https://web.archive.org/web/20230604171839/http://www.old-computers.com/museum/computer.asp?c=597
    date: '2023-06-04'
---

The TI-55 was one of the first programmable calculator which keeps programs and data in memory, even when it was turned off.

112 pre-programmed functions, including statisticals.