Texas Instruments TI-55-II Scientific programmable calculator

General specifications
Type Scientific programmable calculator
Production years 1981 - -
New price USD 40
Operating system n.a.
Chipset/CPU -
I/O -
Performance index 0
Entry method Algebraic with precedence
Precision 11 digits
Advanced functions

Forensic result 9.114640577

Scientific programmable calculator: Texas Instruments TI-55-II
Programming model Partially merged keystroke
Programming features

Program display Keycode
Program editing Overwrite capability
Programming 56 program steps
Data 8 numbers
Functions + - ^
Type LCD
Size 8+2 digits
LWH 1527612 mm
Weight 113 g
Batteries 2LR44
External power -
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This is the enhanced version of an older LED calculator, the TI-55. The calculator has a slanted display and a beautifully expensive look to it.

The scientific part of this calculator is quite thorough, with many statistical functions (marked in red on the keyboard), numeric conversions and numeric integrals. The integral function calculates the volume of a programmed formula between two endpoints.

A huge disadvantage of this calculator is the fact that the keyboard wasn't designed very well and keys start to bounce after continuous use.


Scientific programmable calculator: Texas Instruments TI-55-II

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This page was last modified on February 6th, 2009

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5 Responses so far

Sandy, I must redirect you to eBay or similar sites to get some idea of value. I only occasionally buy calculators when my budget allows it and the price is right. But what I am willing to pay may not at all be a real market value.

Good luck!
April 7th, 2009
What price would you offer for this calculator. We have one that is still in good working condition bought in 1981. Case in good condition, seril # 0271465 also has ATA1883 next to serial#. If you are not interested what would you sell it for?

Thank you
April 7th, 2009
Sorry, none of the calculators on this site are for sale. I am a collector, not a salesman...
February 28th, 2009
No response yet
sinaloa hobson
February 27th, 2009
Where can I order one of these???
sinaloa hobson
February 27th, 2009